There are two problems when the battery cannot be charged. Lithium ions cannot be transported in the electrolyte. However, after the lithium ions are transported from the electrolyte and reach the electrode interface, the entrance door is too small, and the lithium ions cannot enter. Go, after entering, the room is too crowded, and it is more dangerous to be crowded at the door. Accumulation at the door will cause a short circuit. The lower the temperature, the greater the problem.

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