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Several negative materials for lithium ion batteries

2021-05-17

Several negative materials for lithium-ion batteries:

As far as the negative electrode is concerned, silicon has become the research focus of all research groups in the world due to its huge reserves and ultra-high specific capacity (4200mAh/g, equivalent to about ten times that of the current commercial graphite negative electrode). price. It is currently the most commercialized and mature high-capacity anode material. It is also considered to be one of the most ideal cathode materials for the next generation. However, the problem of silicon as a negative electrode is also very serious. For example, in the battery cycle, silicon will experience a volume expansion change of 300% to 400%, which will cause the electrode to be easily crushed and battery failure, so the improvement of its performance is limited. There are three main ways to solve the volume expansion of silicon materials: silicon nano-crystallization, such as nano-silicon particles, silicon nanowires and silicon nano-films, to suppress the volume change of silicon during charging and discharging; preparing silicon materials with special shapes and using silicon Its own deformation to absorb its deformation; silicon-carbon composite material.

Lithium titanate

With the increasing demand for rapid charge and discharge, high rate discharge and high safety, lithium titanate (Li2O-TiO2) has become a research hotspot in recent years. The charge-discharge ratio of Yinlong lithium titanate battery can reach 10-20C, while the charge-discharge ratio of ordinary graphite anode battery is only 2-4C, which is mainly used in new energy buses and large-scale automobile energy equipment.


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