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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