Simply speaking, the working principle of lithium-ion batteries is the embedding and de-embedding of lithium ions between the positive and negative electrodes during the charging and discharging process.
For example, the negative electrode material is usually made of carbon materials such as laminated graphite. As charging and discharging proceeds, the laminated graphite structure will gradually collapse to a certain extent, resulting in the inability to fully embed or de-embed the active lithium ions, which results in a reduction in battery capacity.
This is also true for cathode materials, such as the commercially widely used spinel lithium iron phosphate materials, in the cycle of lithium ions in and out of the lattice will also be a loss of active lithium ions, resulting in capacity decay.
Therefore, in order to extend the life of the lithium-ion battery, in the use of cell phones, try to give the lithium battery before the power is less than 15%, otherwise it will cause the negative carbon material over-discharge, which will destroy the laminar structure, resulting in capacity loss
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