We observed that 3-chloroanisole (3CA), as an electrolyte additive was very effective for overcharging protection during a 12 V overcharging reaction. During overcharging, the cell voltage did not increase beyond 5.3 V, as opposed to other aromatic compounds that showed a voltage shoot-up to 12 V. This behavior was due to the 3CA decomposition and the formation of conducting polymer film within separator and at cathode/electrolyte interface, which consumes the surplus current and inhibit the voltage increase through the shunting effect. In addition, the use of 3CA did not lead to any problems with rate capability, cycle life, and long-term storage behavior at 50 and 70 °C. Furthermore, during storage at 90 °C for 4 and 24 h, electrolyte with 3CA in a Li-ion cell showed a similar increase of cell thickness as a cell without 3CA.

中文翻译：

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3-氯苯甲醚用于锂离子电池的过充电保护

我们观察到，作为电解质添加剂的3-氯茴香醚（3CA）在12 V过充电反应过程中对于过充电保护非常有效。在过充电期间，电池电压不会增加到5.3 V以上，而其他芳香族化合物的电压会飙升至12V。这种现象是由于3CA分解以及在隔膜内和阴极上形成了导电聚合物膜而引起的。 /电解质界面，它会消耗多余的电流并通过分流效应来抑制电压升高。此外，使用3CA不会导致速率能力，循环寿命以及在50和70°C下的长期存储性能方面的任何问题。此外，在90°C下储存4和24小时的过程中，锂离子电池中含3CA的电解质显示出与没有3CA的电池相似的电池厚度增加。