Monday, 10 October 2016

Solar Energy Storage Battery Technology Get a Revolutionary Breakthrough

When natural gas, coal, oil and other non-renewable resources, frequent emergency, energy is increasingly becoming a bottleneck for social development, the solar,wind and other renewable resources has become a new driving force for economic development. At the G20 summit, renewable energy issues, environmental issues will become the object of world leaders concerned, and as the organizer of China is more practical action to demonstrate its adherence to the concept of environmental protection, solar power energy storage technology also achieve a breakthrough, and further summit environmentally friendly match.

100Ah 48V solar battery storage
Solar energy battery storage in the near future will occupy an important position in the world energy consumption, not only to replace part of conventional energy sources, and will be the subject of the world's energy supply. By 2030, renewable energy in the total energy mix accounted for more than 30%, while the proportion of solar battery storage in the world's total electricity supply will also be more than 10%.
LD1250B LifePo4 Solar storage battery
China has become the world's leading producer of solar storage batteries. 2007 national solar energy battery storage production reached 1188MW, an increase of 293%. China has already overtaken Europe, Japan, the world's solar storage battery manufacturing superpower. In the Yangtze River Delta, the Bohai Sea, the Pearl River Delta, Midwest, it has formed a unique solar energy storage battery industry cluster, a growing number of national companies to enter the field of solar energy.
LD4840B Household energy storage battery
In addition to solar energy storage batteries, lithium batteries, secondary batteries, sodium-ion batteries have international forefront of technological breakthroughs. In April 2015, new progress in the lifepo4 battery pack BMS design, solution-oriented high security lithium-ion batteries, battery management systems difficult and hot issues long-life operation, the use of the proposed method for NASA Ames Strawbery prediction Center three more data to fit a standard battery. 

Lithium-ion Battery VS LifePo4 Solar Energy Battery Storage

LifePo4 solar energy battery storage, refers to as a cathode material for LifePo4 batteries. Lithium-ion battery cathode material of lithium cobalt oxide, lithium manganese, nickel, lithium, ternary materials, lifePo4. Wherein the lithium cobalt oxide cathode material is currently used in the vast majority of lithium ion batteries.

LifePo4 Solar Energy Battery Storage Eight Advantages

Improve safety performance

lifePo4 crystals of P-O bond firm, difficult to decompose, even at high temperature or overcharge will not be as lithium cobalt oxide as the structure collapses fever or strong oxidizing substances, it has a good safety profile. There are reports that practice acupuncture or short experiment, we found a small part of the sample combustion phenomenon occurs, but there was one case of bombing, and overcharge used in the experiment far beyond the self-discharge voltage of high voltage charging several times and found that there are still explosions. Nevertheless, the overcharge security than ordinary liquid electrolyte lithium cobalt oxide batteries, has been greatly improved.

Improve life

LifePo4 refers to the use of lifePo4 as the cathode material for solar power storage solutions.
LP-4840P-Solar energy storage battery solutions-2
Long-life lead-acid battery cycle life of about 300, the maximum is 500, while the lifePo4 solar storage battery , the cycle life of more than 2000 times the standard charge (5 hour rate) used up to 2000 times. With the quality of lead-acid batteries is the "new six months, six months old, Maintenance and six months", most will be from 1 to 1.5 years, while the lifePo4 used under the same conditions, the theoretical life expectancy will reach 7 to 8 years. Taken together, the cost performance is theoretically more than four times the lead-acid batteries. High-current discharge high current 2C fast charge and discharge, under the dedicated charger, 1.5C charge you can make in 40 minutes the battery is full, the starting current of up to 2C, but no such performance lead-acid batteries.

Good high temperature performance

lifePo4 peak heating up to 350 ℃ -500 ℃ and lithium manganese oxide and lithium cobalt only about 200 ℃. Wide operating temperature range (-20C - + 75C), there is high temperature characteristics of lifePo4 peak heating up to 350 ℃ -500 ℃ and lithium manganese oxide and lithium cobalt only about 200 ℃.

High capacity

The ordinary batteries (lead-acid) greater capacity. 5AH-1000AH (monomer)

No memory effect

Rechargeable solar energy storage batteries in full condition after letting go often in work, the capacity will be lower than the nominal capacity value rapidly, a phenomenon called memory effect. Such as nickel metal hydride and nickel cadmium batteries exist memory, lifePo4 is no memory effect, no matter what state the battery can recharge it with no need to recharge is done.
LP-4850P-Solar energy storage battery solutions-3
Light weight

The volume of the same specifications capacity lifePo4 battery pack is the volume of lead-acid batteries 2/3, 1/3 weight of lead-acid batteries.

Environmental protection

The solar energy storage batteries are generally considered to be free of any heavy metals and rare metals (nickel-metal hydride batteries to be rare), non-toxic (SGS certification through), non-polluting, in line with European RoHS regulations as an absolute battery green card. So the reason to be optimistic about the lithium battery industry, mainly environmental considerations, so the battery and included in the "863" national high-tech development plan "fifth" period, becoming the state's key projects to support and encourage development. Chinese exports of electric bicycles will increase rapidly, and enter the European electric bikes have been with the requirements of non-polluting batteries.

But some experts said the environmental pollution caused by lead-acid batteries, mainly in the business of non-standard production processes and recycling sectors. Similarly, lithium batteries are the new energy industry is good, but it can not avoid the problem of heavy metal pollution. Metal materials processing lead, arsenic, cadmium, mercury, chromium, etc. are likely to be released into the dust and water. The battery itself is a chemical substance, it is possible to produce two kinds of pollution: the production engineering process fecal contamination; the second is scrapped after battery pollution.

lifePo4 has its drawbacks: such as poor low temperature performance, small cathode material tap density and volume capacity of lifePo4 is greater than the lithium cobalt oxide lithium-ion solar battery storage, and therefore does not have the advantage in miniature solar battery storage. And when used in motive power batteries, lifePo4 batteries and other batteries, battery consistency need to face the problem.

Comparison of battery

The most promising are used in power lithium-ion solar battery storage cathode materials are modified lithium manganese oxide (LiMn2O4), lifePo4 (LiFePO4) and nickel cobalt manganese lithium (Li (Ni, Co, Mn) O2) three yuan material. Nickel, cobalt and manganese lithium cobalt ternary material due to a lack of resources and nickel, and cobalt into high price volatility and other factors, generally considered difficult to become electric vehicle power lithium-ion battery of the mainstream, but with manganese spinel lithium mixed within a certain range. 

This article comes from

Dehydration Problem Lithium Battery Cathode Material LifePo4

Dehydration is a lifepo4 battery pack materials eternal topic, both positive and negative material production, or electrode production process have to face the problem of dehydration. FePO4 precursor material is both LiFePO4 material, but also can be used alone as the positive electrode material, so the problem of dehydration FePO4 material that we can not avoid the problem.

Generally iron phosphate dehydration process is divided into two parts: the first one, mainly to take off some of the material in the free water which is very easy to remove, the temperature is lower.

100Ah 48V solar battery storage
Second, the crystallization of the material off the water, the water molecules with the iron phosphate materials chemically combined manner, it requires a higher activation energy - that is, higher temperatures, complete removal of the water to this part, but the study reaction kinetics of the process is not a lot.

Preparation of iron phosphate commonly used ferric sulfate or other soluble ferric iron source, phosphoric acid or phosphate as the phosphorus source, NaOH as PH regulator, by co-precipitation methods.

Actual production is generally controlled between 1.6-2.0 PH, PH is too high when it may precipitate Fe (OH) 3 impurities, and PH value is too low will cause the precipitation of Fe3 + incomplete. The precipitate is filtered and washed after high temperature sintering is required, this process is mainly for two purposes, first off FePO4˙2H20 material in the water, and secondly to make FePO4 crystal material fully developed, in order to ensure a complete crystalline material type. These lifepo4 battery usually can be used in solar powered portable generator.

TG was found in the range of 50-223 ℃, FePO4˙2H20 material appeared in 20.23% of weight loss, which is mainly FePO4˙2H20 material two crystal water is removed, and then as the temperature rises, FePO4 material does not continue to appear weightless, so the dehydration process is mainly done in this process.

In 736 ℃ appeared an exothermic peak, and there was no loss of quality, which indicates that at this temperature, the material FePO4 crystalline transition occurs subsequent XRD diffraction analysis also found that, at 700 ℃ under synthetic material FePO4 diffraction peak is wide, part of the characteristic peak does not appear, at this temperature synthetic crystalline material FePO4 incomplete development of poor crystallinity.

The temperature was raised to 800 ℃, all characteristic peaks were appeared, but the characteristic peak intensity is still low, wide, indicating at the same temperature, crystal growth is still not complete, when the firing temperature is raised to 900 ℃, can pay attention to this time appears not only all the peaks, a characteristic peak of hexagonal (206) / (302) has also been completely separated, indicating FePO4 crystalline material well-developed.

LP-4850P-Solar energy storage battery solutions-3
At 900 ℃, FePO4 prepared material belonging to the hexagonal lattice parameters a = 0.50330nm, b = 0.50330nm, c = 1.12470nm, having α- quartz structure which is conducive to the lifepo4 batteries material embedded into FePO4 .

Kinetic studies on the dehydration FePO4 not much, FePO4 material dehydration mechanism and kinetics study has important implications for the development of the production process iron phosphate material.

The use of TG-DTG-DTA thermal analysis to study the mechanism and kinetics of dehydration FePO4˙4H20 materials, the study found FePO4˙4H20 material at 200 ℃, there were two DTG DTA exothermic peak and peak rate of weight loss, dehydration process is a two-step reaction, calculations show that the reaction is a D4-Fn-step reaction in which the activation energy of the reaction is D4 79.62KJ / mol, activation energy of the reaction Fn 103.04KJ / mol.

The study found no effect on the heating rate in the dehydration reaction mass, so long as the heating temperature reaches the appropriate temperature can be sufficiently removed FePO4 water. This has important implications for the sintering process of iron phosphate.

This article comes from

AGL Installs Solar Batteries

ENERGY giant AGL will install solar power batteries on 1000 homes across Adelaide, building a ‘virtual power plant’ to provide back-up electricity to householders and the state’s energy grid during times of high energy demand.

In what is expected to be the largest project of its kind in the world, the batteries will store excess solar power that would otherwise be fed into the grid and will be able to be drawn upon by the customer, reducing their power costs and demand on the grid. Mostly, ourportable solar power generator is also use these batteries.

AGL will also have the ability to direct power from the battery to the customer’s home or into the grid during critical events such as peak demand resulting from severe weather. 

Any solar energy exported to the grid will occur at the agreed retail feed in tariff.

The system will generate a peak capacity of 5MW, or, according to AGL figures, the equivalent of the average annual power consumption of one home.

The first of the 7.7kW batteries, to be subsidised through AGL and the federal Australian Renewable Energy Agency, are expected to be installed later this year at a cost of $3500 to existing AGL solar customers. 

AGL anticipates a payback of approximately seven years to customers who purchase lifepo4 batteries as part of the project.

This article comes from

Around The World With Zero Fuel

The first aircraft powered solely by the sun made a historic landing in Abu Dhabi on Tuesday, completing the 25,000 mile, round-the-world journey that began in March 2015. 

The Swiss-engineered Solar Impulse 2 was piloted by Bertrand Piccard on the final part of its epic expedition that took off from Cairo earlier this week. The last stop completes its 17-leg, milestone journey using only the power of the sun's rays. Solar powered portable generator's power also comes from sun.

The lightweight aircraft, which weighs the same as an SUV but has the wingspan of a Boeing 747, is the brainchild of Piccard and Bertrand Borschberg, a Swiss engineer and businessman. The aircraft is a single-seater, so the two men have shared the flying by taking different legs of the journey.

"What I'd like to show with my team is that clean technology today is showing incredible goals. You can fly now longer without fuel than with fuel, and you fly with the force of nature, you fly with the sun. It's the new era now for energy and this is really what we'd like to inspire people to do," Piccard said.

Solar Impulse 2 demonstrates the exploration of energy efficient lifepo4 battery pack and clean technology that could potentially alter the way we travel.

The article comes from

Residential Battery Storage Not Yet

Australian homeowners may be flocking to energy storage in droves. But one of the country’s biggest engineering consultancies doesn’t see the financial sense in it.

Victoria-based Aurecon, which has operations across Africa, Asia, Australasia and the Middle East, and which has been associated with major renewable energy projects such as the Kogan Creek Solar Boost plant, says the financial impact of adding batteries to residential PV is “negative."

“Aurecon has modeled multiple scenarios with a Tesla Powerwall lithium-ion battery pack coupled with a 4-kilowatt rooftop PV system,” said Victor Young, the company’s market director for energy, oil and gas. “Adding batteries increases the cost of power even in the most favorable circumstance of a zero feed-in tariff from the network provider.”

As it happens, the Powerwall might not be the best battery on the Australian market, on a cost per total warranted kilowatt-hours basis. That honor currently goes to the Redflow ZCell zinc-bromide residential flow battery, according to SolarQuotes. 

However, said Young: “The advertised higher cost of current-generation flow batteries does not encourage us to expect that the return on investment for this type of battery would be better.” Expect the flow battery could be used insolar powered portable generator.

The article comes from

Bulk-Buy Promises Australians Lower Prices Sooner

Australia’s first bulk-buy program for solar battery storage has launched, with more than 1,000 people in Newcastle expressing interest and more than 500 attending a sign-up event on Thursday night to buy home battery systems. From Friday, the program is being opened to people all around Australia.

The cost and complexity of solar power storage solutions, and the expectation that prices will come down , has so far discouraged purchases.

Until customer numbers rise it is hard for wholesalers, retailers and installers to bring their prices down, said Simon Sheikh, managing director of Future Super and a co-founder of the bulk-buy solar storage company SunCrowd.

“The problem is how to scale up the solar storage industry faster so as to reduce the costs for those companies,” he said. “If each company has got to spend $1,000 acquiring a customer, that’s $1,000 they’re going to put on top of the price. Solar storage industry is including solar powered portable generator industry.

Australians have spent almost $8bn on rooftop solar since 2007, says report.

This article comes from