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In the first charge and discharge process, the additive LiPO2F2 is superior to the solvent decomposition of carbonates, and takes part in the formation of a layer of SEI film with high temperature stability and favorable for Li+ embedding and deembedding on the positive electrode surface of the battery.Add 1% LiPO2F2 battery is stored under high temperature 60 ℃ in 14 d, retention capacity increased by 6.05%, capacity recovery rate increased by 6.01%, especially has inhibitory effect on the battery high temperature gas, thickness expansion rate decreased by 20.36%, improve the performance of the high temperature storage. As can be seen from the figure, the standard electrolyte begins to decompose slowly around 4.5v, the current increases with the increase of voltage, and rapidly increases after 5.5v. The electrolyte adding 1% LiPO2F2 decomposes around 4.4v, and the decomposition accelerates around 5.3v, indicating that the oxygenation decomposition of the electrolyte adding 1% L...