1. Requirements for the overall environment

　　With the rapid development of China's economy, the demand for limited and unevenly distributed oil resources in the automotive market is increasing. This situation poses two important issues: China's severe dependence on oil resource imports affects the development and stability of its economic security; The combustion of oil emits a large amount of carbon dioxide, which causes a greenhouse effect and subsequently causes sea level rise, affecting the safety of coastal cities, and the emission of other toxic gases and PM2.5 seriously pollutes the urban environment. Therefore, electric vehicles that can replace mineral energy as power have received widespread attention. However, the major issue currently restricting the application and promotion of electric vehicles is the low mass, specific energy, and specific power of electric vehicle power batteries. Therefore, improving the energy density of the power batteries used in electric vehicles is the key to developing electric vehicle technology.

　　2. Strong market demand

　　Currently, power batteries mainly include lead-acid batteries, nickel hydrogen batteries, fuel cells, and lithium-ion batteries. Nickel hydrogen batteries and lead-acid batteries are not suitable as long-term power sources for electric vehicles due to their low mass, specific energy, and specific power. In addition, due to the issue of hydrogen storage in fuel cells and the consideration of expensive material costs such as the use of precious metal platinum catalysts, the application of fuel cells in electric vehicles is still far away. Therefore, compared to other battery systems, lithium-ion batteries currently have advantages such as long cycle life, small self-discharge, low temperature dependence, high energy density, and no memory effect, which have shown great development and application prospects and huge economic benefits in many aspects. They are considered a useful power supply solution for electric vehicles.

　　However, the specific energy, specific power, and operating voltage of polymer lithium batteries are relatively low, which requires further improvement in the specific energy and specific power of batteries in large-scale pure electric vehicle applications. In addition, the application of lithium-ion batteries also needs to consider cost and safety. Currently, due to its advantages such as light weight, easy film formation, high energy density, and good safety, people have begun to focus on the research of polymer electrolytes.

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