Wednesday, 14 January 2015

The Basic Composition of Lithium-ion Battery and Main Materials


The basic composition of lithium-ion battery and main material, lithium-ion battery is a chemical power.

two electrodes cell redox reaction in progress, respectively, must be carried out in two separate areas, which is different from general oxidation-reduction reaction.

When two electrode active material undergo a redox reaction, the desired electron must be transferred from an external circuit, which is different from the micro-cell reaction corrosion process.

In order to meet the above conditions, no matter what the battery series, shape, size, by the following components: an electrode (active material), electrolyte, separator, binder, a housing; in addition to positive and negative electrode lead, the center terminals, insulating material, the safety valve, PTC (positive temperature control terminal) and the like are also an integral part of the lithium ion battery. The following briefly describes the lithium-ion battery in a few major components, namely the electrode material, electrolyte, separator and adhesives.

An electrode material

Is the core of the electrode of the battery, the active material and the conductive framework composition. Positive and negative active material is a source of generating electric energy, the battery is to determine the basic characteristics of an important part. As in lithium-ion batteries, the current commercialization of the cathode active material for lithium-ion batteries are generally LiCoO2, the current research focus is moving without cobalt material efforts, there are some on the market LiMn2O4 cathode materials used and so on.

Non-static electricity inside the power supply unit of positive charge is to move from the negative power supply circuit to the cathode through the internal process of the work done. EMF symbol is ε, in volts (V). Additional power is a form of energy into the electrical energy. To maintain a constant current in the circuit, only the electrostatic force enough, you also need to have a non-static electricity. Power is providing non-static electricity, the positive charge is moved from a low potential at the high potential of the non-electrostatic charge to promote the process of doing work that other forms of energy is converted to electrical energy in the process.

EMF is a physical quantity characterizing the power generating electrical energy. Different supply sources of different non-static electricity, energy conversion forms are also different. Such as chemical electromotive force (batteries, button batteries, batteries, lithium-ion batteries, etc.) is a non-chemical effects of static electricity, the size and power independent of electromotive force size; non-static electricity generator is the magnetic field of the moving charge forces; photo-electromotive force (photovoltaic cells) derived from a non-static electricity within the photoelectric effect; piezoelectric electromotive force (crystal piezoelectric ignition, crystal microphone, etc.) from the polarization caused by mechanical work.

When the external circuit power supply is disconnected, non-static electricity and electrostatic field strength inside the power supply balance, the positive and negative power supply voltage is equal to the electromotive force at both ends. When the external circuit is turned on, the terminal voltage is less than the electromotive force.

With less low prices

Second, the battery assembly process and technology

In accordance with the structural design and the design parameters of lithium batteries, how to prepare the material of the selected battery and efficiently together, and assembled with the design requirements of the battery, the battery production process is to be solved. Thus, the cell production process is reasonable, is related to the assembly of the battery is the key to meet the design requirements of the most important steps affect battery performance.

Reference AA-Cd / Ni, MH / Ni battery production process, combined with the AA-type lithium-ion battery design and performance characteristics, and repeated testing of lithium-ion battery materials, AA lithium-ion battery production process to determine .

AA lithium-ion battery production process involves four steps: preparing tablets
positive and negative; batteries winding; assembly; seal. This is the traditional AA-Cd / Ni battery production process is not much difference, but in the process, the lithium-ion battery is much more complex, and environmental conditions should be much more demanding requirements. Lithium-ion batteries are very strict manufacturing technology, require complex. The following table lists the graphite / LiCoO2 series cylindrical lithium-ion battery manufacturing process related parameters.

Wherein the preparation of the positive and negative electrode slurry, the positive and negative film coating, drying, rolling and other preparation, wound batteries greatest impact on cell performance, a lithium-ion battery manufacturing technology is the most critical step. These processes make the following brief introduction.

To prevent the lithium metal anode mass flow in parts of the copper precipitation caused by security issues, the need for process improvement pole piece, both sides need to use copper foil coated with carbon paste. The main steps of the process of lithium-ion batteries as follows.

positive and negative pulp with special solvents and adhesives were mixed with powdered active substances, even after a high-speed mixing, slurried positive and negative material.

coating the slurry was uniformly coated on the surface of the metal foil, drying, respectively made positive and negative tabs.

a diaphragm assembly according to the positive electrode sheet The negative electrode sheet put away in a sequence from top to bottom of a separator, a battery through the winding core, and then by injecting an electrolyte, sealing and other processes, i.e., to complete the assembly process of the battery, the finished products battery.

into with dedicated battery charging and discharging equipment for finished battery charge and discharge testing, for each battery are only for testing, screening qualified battery products to be manufactured.

From the design requirement, because the case is selected for 18650 lithium AA type (
14mm × 50mm), the cell structure design mainly refers to the size of the battery cover, the tightness of the battery assembly, the electrode sheet size, battery upper air chamber , the ratio of polar substances, such as design. Whether they are designed to directly affect the battery's internal resistance, internal pressure, capacity, performance, and security.


The basic composition of lithium-ion battery and main material, lithium-ion battery is a chemical power.

two electrodes cell redox reaction in progress, respectively, must be carried out in two separate areas, which is different from general oxidation-reduction reaction.

When two electrode active material undergo a redox reaction, the desired electron must be transferred from an external circuit, which is different from the micro-cell reaction corrosion process.

In order to meet the above conditions, no matter what the battery series, shape, size, by the following components: an electrode (active material), electrolyte, separator, binder, a housing; in addition to positive and negative electrode lead, the center terminals, insulating material, the safety valve, PTC (positive temperature control terminal) and the like are also an integral part of the lithium ion battery. The following briefly describes the lithium-ion battery in a few major components, namely the electrode material, electrolyte, separator and adhesives.

An electrode material

Is the core of the electrode of the battery, the active material and the conductive framework composition. Positive and negative active material is a source of generating electric energy, the battery is to determine the basic characteristics of an important part. As in lithium-ion batteries, the current commercialization of the cathode active material for lithium-ion batteries are generally LiCoO2, the current research focus is moving without cobalt material efforts, there are some on the market LiMn2O4 cathode materials used and so on.

Non-static electricity inside the power supply unit of positive charge is to move from the negative power supply circuit to the cathode through the internal process of the work done. EMF symbol is ε, in volts (V). Additional power is a form of energy into the electrical energy. To maintain a constant current in the circuit, only the electrostatic force enough, you also need to have a non-static electricity. Power is providing non-static electricity, the positive charge is moved from a low potential at the high potential of the non-electrostatic charge to promote the process of doing work that other forms of energy is converted to electrical energy in the process.

EMF is a physical quantity characterizing the power generating electrical energy. Different supply sources of different non-static electricity, energy conversion forms are also different. Such as chemical electromotive force (batteries, button batteries, batteries, lithium-ion batteries, etc.) is a non-chemical effects of static electricity, the size and power independent of electromotive force size; non-static electricity generator is the magnetic field of the moving charge forces; photo-electromotive force (photovoltaic cells) derived from a non-static electricity within the photoelectric effect; piezoelectric electromotive force (crystal piezoelectric ignition, crystal microphone, etc.) from the polarization caused by mechanical work.

When the external circuit power supply is disconnected, non-static electricity and electrostatic field strength inside the power supply balance, the positive and negative power supply voltage is equal to the electromotive force at both ends. When the external circuit is turned on, the terminal voltage is less than the electromotive force.

With less low prices

Second, the battery assembly process and technology

In accordance with the structural design and the design parameters of lithium batteries, how to prepare the material of the selected battery and efficiently together, and assembled with the design requirements of the battery, the battery production process is to be solved. Thus, the cell production process is reasonable, is related to the assembly of the battery is the key to meet the design requirements of the most important steps affect battery performance.

Reference AA-Cd / Ni, MH / Ni battery production process, combined with the AA-type lithium-ion battery design and performance characteristics, and repeated testing of lithium-ion battery materials, AA lithium-ion battery production process to determine .

AA lithium-ion battery production process involves four steps: preparing tablets
positive and negative; batteries winding; assembly; seal. This is the traditional AA-Cd / Ni battery production process is not much difference, but in the process, the lithium-ion battery is much more complex, and environmental conditions should be much more demanding requirements. Lithium-ion batteries are very strict manufacturing technology, require complex. The following table lists the graphite / LiCoO2 series cylindrical lithium-ion battery manufacturing process related parameters.

Wherein the preparation of the positive and negative electrode slurry, the positive and negative film coating, drying, rolling and other preparation, wound batteries greatest impact on cell performance, a lithium-ion battery manufacturing technology is the most critical step. These processes make the following brief introduction.

To prevent the lithium metal anode mass flow in parts of the copper precipitation caused by security issues, the need for process improvement pole piece, both sides need to use copper foil coated with carbon paste. The main steps of the process of lithium-ion batteries as follows.

positive and negative pulp with special solvents and adhesives were mixed with powdered active substances, even after a high-speed mixing, slurried positive and negative material.

coating the slurry was uniformly coated on the surface of the metal foil, drying, respectively made positive and negative tabs.

a diaphragm assembly according to the positive electrode sheet The negative electrode sheet put away in a sequence from top to bottom of a separator, a battery through the winding core, and then by injecting an electrolyte, sealing and other processes, i.e., to complete the assembly process of the battery, the finished products battery.

into with dedicated battery charging and discharging equipment for finished battery charge and discharge testing, for each battery are only for testing, screening qualified battery products to be manufactured.

From the design requirement, because the case is selected for 18650 lithium AA type (
14mm × 50mm), the cell structure design mainly refers to the size of the battery cover, the tightness of the battery assembly, the electrode sheet size, battery upper air chamber , the ratio of polar substances, such as design. Whether they are designed to directly affect the battery's internal resistance, internal pressure, capacity, performance, and security.

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