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The common cathode materials for power batteries mainly include modified lithium manganate, lithium iron phosphate, ternary materials and lithium-rich manganese base cathode materials.

By comparison, the current performance of these four materials is different:

In terms of modified lithium manganate, its average voltage relative to metal lithium is 4.0V, available specific capacity is 110Ah/kg, specific energy is 440Wh/kg, and the expected specific energy of battery combined with graphite anode is 140Wh/kg. This kind of cathode material has good safety and low cost, but short service life in high temperature environment.

In terms of lithium iron phosphate, its average voltage relative to metal lithium is 3.4V, available specific capacity is 155Ah/kg, specific energy is 527Wh/kg, and the expected specific energy of the battery combined with graphite anode is 160Wh/kg. This cathode material has the best safety, low cost and long service life.

In terms of ternary materials, the average voltage relative to lithium metal is 3.8V, the available specific capacity is 160Ah/kg, the specific energy is 646Wh/kg, and the expected specific energy of the battery combined with graphite anode is 240Wh/kg. The cathode material has low safety, high cost and long service life.

In terms of lithium-rich manganese base, its average voltage relative to metal lithium is 3.6V, available specific capacity is 270Ah/kg, specific energy is 927Wh/kg, and the expected specific energy of the battery combined with graphite anode is 280Wh/kg. The cost of this kind of cathode material is low, and the problem of its service life needs to be solved.

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