Polymer lithium-ion battery and preparation method thereof

Abstract

The invention provides a polymer lithium-ion battery. An anode comprises components in percentage by mass as follows: 95-96% of lithium cobalt oxide, 31-33% of NMP (N-methyl-2-pyrrolidinone), 1.5-2% of PVDF (polyvinylidene fluoride), 0.5-1% of KS-6 and 2.2-2.6% of SP, and the solid content of the anode is in a range of 67-69%. According to the polymer lithium-ion battery and a preparation method of the battery, the fast charge performance of the polymer lithium-ion battery is improved, so that the high-voltage lithium-ion battery meets charge and discharge requirements of 2C and above, the lithium-ion battery is high in energy density, high in uniform output voltage, low in self-discharge, free of the memory effect, capable of realizing fast charge and discharge, high in output power and long in service life, and the charge efficiency is up to 100%.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a polymer lithium ion battery and a preparation method thereof. Background technique [0002] As a new energy source, lithium-ion battery has attracted more and more people's attention, and has become one of the key points of high-tech. Since the 1990s, due to the unique advantages of high specific energy, high working voltage, wide application range, low self-discharge rate, long cycle life, no pollution, and good safety performance, lithium-ion batteries have been widely used in household applications. Electrical appliances, such as mobile phones, notebook computers, video cameras, cameras, etc., and gradually replace traditional batteries in the fields of aviation, aerospace, navigation, artificial satellites, small medical instruments, and military communication equipment. Therefore, lithium-ion batteries have attracted much attention in modern electrochemistry. [0003] ...

AI Technical Summary

Problems solved by technology

Many battery devices require high charging and discharging current and high power. Even many small electrical appliances require fast charging and high-rate discharging. Small current charging and discharging lithium-ion batteries can no longer fully meet the needs of the market.

However, due to factors such as the battery material of the lithium-ion battery itself, its energy density and charge-discharge rate are affected. The ordinary lithium-ion battery not only has a low energy density, but also usually takes more than 2 hours to charge, which cannot meet the needs of certain specific use environments. fast charging effect

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