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　　The positive and negative electrode materials used in polymer lithium ion batteries are the same as liquid lithium ions. The positive electrode materials are divided into lithium cobalate, lithium manganate, ternary materials and Lithium iron phosphate materials. The negative electrode is graphite, which is basically the same as the working principle of liquid electrolyte lithium batteries. Their main difference lies in the difference in electrolytes. Liquid lithium-ion batteries use liquid electrolytes, while polymer lithium-ion batteries use solid polymer electrolytes instead. The outer packaging of polymer lithium-ion batteries is mainly aluminum plastic film, and due to the paste like lithium material in the middle, the shape can be customized arbitrarily. Polymer lithium-ion batteries can be divided into three categories:

　　(1) Solid polymer electrolyte lithium-ion batteries. The electrolyte is a mixture of polymers and salts, and this type of battery has low ionic conductivity at room temperature, making it suitable for high-temperature use.

　　(2) Gel polymer electrolyte lithium ion battery. Adding plasticizers and other additives to the solid polymer electrolyte can improve the ion conductivity and make the battery usable at room temperature.

　　(3) Lithium ion batteries with polymer positive electrode materials. Using conductive polymers as cathode materials, its specific energy is three times that of existing lithium-ion batteries, which is the latest generation of lithium-ion batteries. Due to the use of solid electrolytes instead of liquid electrolytes, polymer lithium-ion batteries have advantages over liquid lithium-ion batteries, such as thinness, arbitrary area, and shape, and do not pose safety issues such as leakage, combustion, and explosion. Therefore, aluminum plastic composite films can be used to manufacture battery shells, thereby improving the specific capacity of the entire battery; Polymer lithium-ion batteries can also use polymers as cathode materials, which can increase their mass to energy ratio by more than 50% compared to liquid lithium-ion batteries. Polymer lithium-ion batteries have improved working voltage and charge discharge cycle life compared to lithium-ion batteries. Based on the above advantages, polymer lithium-ion batteries are hailed as the next generation of lithium-ion batteries.

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