During the cycle, due to the continuous interface side -by -side reaction, the electrolyte loss and li loss are caused. At the same time, due to the uneven temperature, current, and pressure of the lithium battery, it can also cause adverse reactions inside the lithium battery.

Recently, M. J. M. M. Erbauer and A. Senishen from the Munich Institute of Munich in Germany used neutron diffraction technology to analyze the distribution of li and electrolytes in lithium batteries in the end of life. The results show that Li and and and The distribution of electrolytes at the end of life has obvious non -average quality.

The use of neutron diffraction technology to analyze electrolytes requires a comprehensive understanding of its structure and nature, while the content of its research is relatively small. Under low temperature conditions, the electrolyte's conductivity will decrease significantly, and even coagulation will be generated. Using neutron diffraction technology can well study the solidification process of lithium batteries.

The subject of this experiment is the 3.4 AH 18650 battery produced by Panasonic in Japan. Its positive NCA and negative pole graphite. The following A is the internal structure of the lithium battery obtained by the author on the CT. In this experiment, the BTS3000 testing system is used at room temperature. At room temperature, the charging method of CC-CV, 1.675 A, the 6-A constant current discharge method, the 6-A discharge method, and the cycle of the battery are 60,120,210,400,600,800,1000 , 1112 and 1392 times.

In this cycle, the battery attenuation is fast. At 110 times, its initial capacity is 80%, and after 400 times, its energy drops to 60%. When the battery is below 550 times, its attenuation rate is basically proportional to the square root of the cycle, indicating that the SEI film has a great impact on the attenuation of lithium batteries. When the cycle is more than 600 times, the battery capacity is rapidly attenuated. When it exceeds 800 times, its electricity is close to zero.