source:other news
release time:2023-04-18
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LiFePO4 has a wide range of sources, is cheap, has good stability and safety performance, can reach the theoretical specific capacity of 170mAh/g, and its specific power and specific energy are similar to LiCoO2, which can achieve good compatibility with electrolyte solution. Therefore, it is widely used in lithium battery cathode. With this material, the factors affecting the battery capacity mainly include the following two points: First, the side reaction between the positive and negative electrodes leads to the reduction of recyclable lithium, which seriously damages the balance between the positive and negative electrodes; Second, the loss of active materials is caused by factors such as structure deterioration, electrode layer separation, material dissolution, particle separation, etc., which affects the battery capacity.
Carbon black content of positive material
As carbon black itself is an inactive substance, it does not participate in the discharge reaction. If the carbon black content in the positive material is too high, it will affect the strength and capacity of the positive material, so it needs to be added as appropriate. In addition, the transport carrier generates catalytic substances on the surface of carbon black, which can improve the decomposition rate of metal ions and effectively promote the dissolution of active substances.
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