Temperature rise (NASA)

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Degradation modes

If a battery is to be cycled, it is essential that the chemical reactions that take place at the electrodes are efficiently reversed. If only 1% of active material is lost in one cycle, that signifies that 50% capacity would be lost after only fifty cycles. Many, if not most, electrode reactions involve a reconstructive phase change in the crystal chemistry of the active materials. Many possible processes or side reactions leading to battery deterioration or its failure can occur. These include:

The degradation of a battery is usually progressive. However, once started the degradation processes tend to accelerate. (reference)