科研之友
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摘要
Diphenyl ether (DPE) is investigated as a film-forming additive to improve the cyclic stability of LiNi0.5Mn1.5O4 at high voltage and elevated temperature (55 degrees C). Addition of DPE in the baseline electrolyte significantly improves the capacity retention of LiNi0.5Mn1.5O4 at elevated temperature. Its capacity retention increases from 41.2% at the baseline electrolyte to 90.5% after 0.1vol% DPE is added to the baseline electrolyte in 100 cycles. Calculations demonstrate that DPE is oxidized preferentially to the baseline electrolyte. The experimental results show that a robust and uniform film is generated on the LiNi0.5Mn1.5O4 surface, alleviating the subsequent electrolyte decomposition and protecting LiNi0.5Mn1.5O4 from transition metal dissolution and structural destruction.
