Pyrene (PY) is first used as an additive to improve the cyclic stability of LiNi_0.5Mn_1.5O₄ at high cutoff voltage. After 300 cycles at room temperature (≈25 °C) and 100 cycles at elevated temperature (≈55 °C), the capacity retention of Li/LiNi_0.5Mn_1.5O₄ cells is 93.1% and 92.68% in the electrolyte containing 0.0025 wt% PY. However, in the base electrolyte, the capacity retention of the cells is 84.7% and 88.12%. The improved capacity retention is due to a thin and even cathode electrolyte interphase (CEI) film containing the poly‐PY on surface of LiNi_0.5Mn_1.5O₄, which reduces the oxidation reaction of electrolyte, the dissolution of transition metal, and the interface impedance in subsequent cycles. In addition, the cross‐talk effect between the positive and negative electrodes is effectively avoided. The film derived from PY also improves the rate performance of cell at room temperature.

中文翻译：

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通过使用as作为新型添加剂提高LiNi0.5Mn1.5O4在高截止电压下的循环稳定性

first（PY）首先用作添加剂，以提高LiNi _0.5 Mn _1.5 O ₄在高截止电压下的循环稳定性。在室温（≈25°C）下300次循环和在高温（≈55°C）下100次循环后，Li / LiNi _0.5 Mn _1.5 O ₄电池在含0.0025 wt％的电解液中的容量保持率_分别为93.1％和92.68％ ％PY。然而，在基础电解质中，电池的容量保持率为84.7％和88.12％。容量保持率的提高归因于在LiNi _0.5 Mn _1.5 O ₄表面上包含聚-PY的薄而均匀的阴极电解质中间相（CEI）膜，可减少电解质的氧化反应，过渡金属的溶解以及后续循环中的界面阻抗。另外，有效地避免了正极与负极之间的串扰效应。源自PY的薄膜还改善了室温下电池的倍率性能。