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The development process of polymer lithium-ion batteries

1. The birth and principle of polymer lithium-ion batteries

Lithium ion polymer battery was introduced in 1994 and uses gel polymer electrolyte. This concept was originally developed by Bellcore. Later, Sony in Japan, Samsung in South Korea and other companies developed a new structure of gel polymer lithium-ion battery on this basis, which was put into production around 2000. At present, the principle of lithium-ion battery and the electrochemical reaction during charging and discharging are basically the same as those of liquid lithium-ion battery, except that gel polymer electrolyte is used.

2. Characteristics of polymer lithium-ion batteries

Based on lithium-ion batteries, polymer lithium-ion batteries not only have the characteristics of lithium-ion batteries, but also have the following characteristics:

Plastic has good elasticity and can be made into batteries of various shapes;

Safe and reliable, not easily combustible;

(3) Long cycle life and low capacity loss;

(4) High volume utilization rate, up to 10%~20% compared to liquid lithium-ion batteries;

Large batteries can be manufactured without being connected in series;

6. Do not use traditional diaphragm materials;

(7) Easy to industrialize on a large scale;

Today, we are applying it to a wider range of fields.

Lithium metal is feasible as the negative electrode material for all solid polymer lithium-ion batteries.

3. Development and types of lithium-ion batteries

At present, China has been able to produce polymer lithium-ion batteries, but it is important to improve on the basis of liquid lithium-ion batteries. Compared with some different types of gel polymer lithium-ion batteries of Japanese companies, to some extent, only half (quasi) gel polymer lithium-ion batteries can be said, and some soft packaging can also be said to be liquid lithium-ion batteries. Therefore, the improvement of polymer lithium-ion battery technology in China requires continuous efforts and cooperation from the industry and academia.

According to the January 2005 issue of Futurist, high-power power supply group is one of the top ten innovative products in the next 10 years, and high-power power supply group is the first company to introduce advanced batteries. Therefore, the development of polymer lithium-ion batteries will greatly promote the further development of high-power power generation groups and preparation technologies, and related materials, energy density, and performance will continue to improve. Therefore, it is necessary to attach great importance to research and development in this field in order to win the battle without fail.

4. Structure of polymer lithium-ion batteries

The structure of polymer lithium-ion batteries is the same as lithium-ion batteries, nickel hydrogen batteries, etc. It generally includes the following components: positive electrode, negative electrode, electrolyte, positive electrode lead, negative electrode lead, etc.

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