Overcharge and discharge of lithium-ion batteries can cause permanent damage to both positive and negative electrodes. Excessive discharge will lead to the collapse of the anode carbon lamellar structure, and the collapse will cause the lithium ion can not be inserted in the charging process. Overcharging embeds so many lithium ions into the carbon structure that some of them can no longer be released.
Charging quantity is equal to charging current times charging time. Under the condition of constant charging control voltage, the larger the charging current (the faster the charging speed), the smaller the charging quantity. Battery charging speed is too fast and the termination voltage control point is not appropriate, will also lead to insufficient capacity of the battery, in fact, part of the battery electrode active substances are not fully reacted to stop charging, this phenomenon of insufficient charge with the increase of the number of cycles.
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