Lithium battery improvement.18650 lithium-ion battery

　　At present, the poor conductivity and lower lithium -ion diffusion coefficients of LFP materials have always been the main reason that hinders its practicality, and thus prompted domestic and foreign scholars to conduct research on improving the conductivity of Limpo4. However, because its extremely low electronic conductivity (10-10 ~ 10-9 S/CM) is the most important factor to limit its actual application. A123 has been able to overcome this shortcoming method of modified by covering, replacement, and preparing nano -level materials. In order to improve the electronic conductivity of the FEPO4 after lithium loss, the electronic conductivity of the FEPO4 can introduce a dispersible conductive agent with good decentralized performance between the Limpo4 powder, such as carbon black or carbon, which can significantly improve the conductive performance between particles, which improves the utilization efficiency of Limpo4. Reverse electricity capacity can reach 95%of the theoretical value, even if the circulating performance performance is very good at 5C's large current charging conditions.

　　In addition, the method of using inorganic oxides for surface covering is also one of the means to improve structural stability and increase material conductivity. The circulating performance after covering in traditional LICOO2 has significantly improved. The dissolution of cobalt, suppressing the decline of electrical capacity. Similarly, the surface covering of Limpo4 grains for inorganic matter (such as Zno or ZRO2) can not only improve the performance of the cycle life, and increase the electricity capacity and large current discharge when discharging large current discharge. Performance.

　　Since adding conductive carbon can improve the utilization efficiency of Limpo4, such as Japanese Mitsui Shipbuilding and Aleees published other metal with conductive performance such as copper or silver particles can achieve the same effect. The reversible capacity can reach 140mAh/g, and the large current discharge performance is ideal.

　　The low temperature characteristics of this battery need to be improved. At -20 degrees, the capacity is only 50%. In this way, many products use this battery and cannot be sold to some regions with cold winter, such North America and so on.

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