The rapid development of new energy vehicles, what development needs have been put forward for lithium batteries?

Aug 15, 2019   Pageview:15

Chenkeyu, deputy secretary of energy storage Department of Chengdu yazun new energy vehicle technology Co., Ltd., pointed out that new energy vehicle power batteries face high battery prices, long charging times, short mileage, poor environmental versatility, and short service life during use. Therefore, new energy vehicles have put forward new development needs for lithium batteries:


One is to improve the high temperature, low temperature, charging, discharge consistency.


The second is to achieve high charging ratio through battery design and material improvement.


The third is to increase energy density, mainly by building on the existing high-capacity material system, optimizing the electrode structure, and increasing the load of active substances; Application of new material system to improve battery working voltage; Optimize the new material system and use the new battery structure to achieve.


The fourth is to improve safety, especially in extreme conditions. Fifth, reducing costs. The sixth is to pay attention to the secondary recycling of batteries.


The average annual growth rate of lithium-ion batteries for new energy vehicles over the next five years is around 50 per cent, according to Liuyanlong, secretary-general of the China Chemical and Physical Power Industry Association. Advances in lithium-ion battery technology are mainly due to the progress in research and application of key battery materials. Through the development of new materials, battery performance is further improved, quality is improved, cost is reduced, and safety is improved.


Liuyanlong pointed out that lithium-ion battery electrolytes and membranes are increasingly important for improving battery performance and safety. Electrolytic additives and diaphragm coatings are important measures to cooperate with lithium-ion batteries to increase voltage(increase energy density), maintain life and ensure safety.. In the battery electrolyte field, emphasis should be placed on functional electrolytes. The choice of additives is the focus of the research and development of electrolytes.


In particular, the new electrolyte system(containing solvents, solute and additives), functional electrolytes(including additives) suitable for high nickel NCM power cells, electrolytes suitable for energy storage batteries(especially additives), cryogenic electrolytes, high temperature type(150 degrees Celsius) Focus on flame retardant electrolytes.


Coating(or composite) diaphragm is the focus of the development of diaphragm application. Coating layer is used on the diaphragm surface. First, the thermal stability of the diaphragm can be improved. Second, it can improve the infiltration ability of the diaphragm to the electrolyte, which is conducive to reducing the resistance and increasing the discharge power in the battery. Third, coating can prevent or reduce the diaphragm oxidation, which is conducive to the operation of the positive electrode of Gaodianya and extend the battery cycle life.


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