Saturday, 17 September 2016

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

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 energy battery storage.

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.

Light weight

The volume of the same specifications capacity lifePo4 solar energy storage batteries 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.

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