Autocatalytic decomposition of LiPF₆, with generation of HF and Lewis acids is the root cause for Li-ion battery (LIB) performance degradation. Acidic species promote various parasitic reactions, among which transition metal ions’ dissolution and the loss of electroactive as well as transport Li⁺ have the most detrimental consequences for LIB performance. Herein we report on the performance improvements enabled by an acid-scavenging separator in cells with graphite negative and LiMn₂O₄ or LiNi_0.6Mn_0.2Co_0.2O₂ positive electrodes. After 4 weeks of cycling at 55 °C, LiMn₂O₄∥graphite and LiNi_0.6Mn_0.2Co_0.2O₂∥graphite cells with functional separators retain 100 and 43% more capacity, respectively, than cells with plain polypropylene separators. Furthermore, cells with functionalized separators have half of the interfacial impedances of cells with baseline separators, irrespective of positive electrode. The benefits afforded by acid-scavenging separators thus extend to broader classes of cell chemistries, beyond those affected mainly by manganese dissolution and loss of electroactive Li⁺ ions.

中文翻译：

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除酸隔膜：提高锂离子电池耐久性的新途径

LiPF _6的自动催化分解以及HF和路易斯酸的生成是锂离子电池（LIB）性能下降的根本原因。酸性物质会促进各种寄生反应，其中过渡金属离子的溶解以及电活性物质的迁移以及Li ^+的传输对LIB性能的危害最大。在本文中，我们报告了通过除酸隔板在具有石墨负极和LiMn ₂ O ₄或LiNi _0.6 Mn _0.2 Co _0.2 O ₂正极的电池中实现的性能改进。在55°C下循环4周后，LiMn ₂ O ₄具有功能隔板的石墨和LiNi _0.6 Mn _0.2 Co _0.2 O ₂石墨电池的容量分别比具有普通聚丙烯隔板的电池高100％和43％。此外，具有功能化分隔物的电池，无论具有正极性，都具有具有基线分隔物的电池的界面阻抗的一半。因此，除酸分离器所提供的好处扩展到了更广泛的细胞化学类别，而那些主要受锰溶解和电活性Li ⁺离子损失影响的化学物质除外。