Battery charging and discharging once is called a cycle, cycle life is an important indicator of the battery life performance. Factors affecting the cycle life of lithium-ion batteries inherent in the root cause, is to participate in the energy transfer of lithium ions in the number of decreasing. The total amount of lithium in the battery does not decrease, but the "activated" lithium ions are less, they are confined in certain places or the transmission channel is blocked, and can not freely participate in the charging and discharging process. Specifically:

(1) Precipitation of lithium metal

(2) Decomposition of cathode material

(3) SEI film on the electrode surface: carbon anode material, during the initial cycle, the electrolyte will form a solid electrolyte (SEI) film on the electrode surface, and the formation process of SEI film will consume lithium ions.

(4) Loss of electrolyte

(5) Diaphragm blockage or damage

(6) Dislodging of cathode and anode electrode materials

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