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Simultaneous Stabilization of LiNi0.76Mn0.14Co0.10O2 Cathode and Lithium Metal Anode by Lithium Bis(oxalato)borate as Additive
ChemSusChem ( IF 7.5 ) Pub Date : 2018-06-11 , DOI: 10.1002/cssc.201800706 Wengao Zhao 1, 2 , Lianfeng Zou 3 , Jianming Zheng 1 , Haiping Jia 1 , Junhua Song 1 , Mark H. Engelhard 3 , Chongmin Wang 3 , Wu Xu 1 , Yong Yang 2, 4 , Ji-Guang Zhang 1
ChemSusChem ( IF 7.5 ) Pub Date : 2018-06-11 , DOI: 10.1002/cssc.201800706 Wengao Zhao 1, 2 , Lianfeng Zou 3 , Jianming Zheng 1 , Haiping Jia 1 , Junhua Song 1 , Mark H. Engelhard 3 , Chongmin Wang 3 , Wu Xu 1 , Yong Yang 2, 4 , Ji-Guang Zhang 1
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The long‐term cycling performance, rate capability, and voltage stability of lithium (Li) metal batteries with LiNi0.76Mn0.14Co0.10O2 (NMC76) cathodes is greatly enhanced by lithium bis(oxalato)borate (LiBOB) additive in the LiPF6‐based electrolyte. With 2 % LiBOB in the electrolyte, a Li∥NMC76 cell is able to achieve a high capacity retention of 96.8 % after 200 cycles at C/3 rate (1 C=200 mA g−1), which is the best result reported for a Ni‐rich NMC cathode coupled with Li metal anode. The significantly enhanced electrochemical performance can be ascribed to the stabilization of both the NMC76 cathode/electrolyte and Li‐metal‐anode/electrolyte interfaces. The LiBOB‐containing electrolyte not only facilitates the formation of a more compact solid–electrolyte interphase on the Li metal surface, it also forms a enhanced cathode electrolyte interface layer, which efficiently prevents the corrosion of the cathode interface and mitigates the formation of the disordered rock‐salt phase after cycling. The fundamental findings of this work highlight the importance of recognizing the dual effects of electrolyte additives in simultaneously stabilizing both cathode and anode interfaces, so as to enhance the long‐term cycle life of high‐energy‐density battery systems.
中文翻译：
双草酸硼酸锂作为添加剂同时稳定LiNi0.76Mn0.14Co0.10O2阴极和锂金属阳极
LiPF中的双（草酸）硼酸锂（LiBOB）添加剂极大地增强了具有LiNi 0.76 Mn 0.14 Co 0.10 O 2（NMC76）正极的锂（Li）金属电池的长期循环性能，倍率性能和电压稳定性。6型电解液。在电解质中含2％LiBOB的情况下，Li∥NMC76电池在以C / 3速率（1 C = 200 mA g -1），这是报道的富镍NMC阴极与锂金属阳极耦合的最佳结果。电化学性能的显着提高归因于NMC76阴极/电解质和锂金属阳极/电解质界面的稳定。含LiBOB的电解质不仅有助于在Li金属表面上形成更致密的固-电解质界面，而且还形成增强的阴极电解质界面层，从而有效地防止了阴极界面的腐蚀并减轻了无序现象的形成。循环后的岩盐阶段。这项工作的基本发现突显了认识到电解质添加剂在同时稳定阴极和阳极界面方面的双重作用的重要性，
更新日期：2018-06-11
中文翻译：
双草酸硼酸锂作为添加剂同时稳定LiNi0.76Mn0.14Co0.10O2阴极和锂金属阳极
LiPF中的双（草酸）硼酸锂（LiBOB）添加剂极大地增强了具有LiNi 0.76 Mn 0.14 Co 0.10 O 2（NMC76）正极的锂（Li）金属电池的长期循环性能，倍率性能和电压稳定性。6型电解液。在电解质中含2％LiBOB的情况下，Li∥NMC76电池在以C / 3速率（1 C = 200 mA g -1），这是报道的富镍NMC阴极与锂金属阳极耦合的最佳结果。电化学性能的显着提高归因于NMC76阴极/电解质和锂金属阳极/电解质界面的稳定。含LiBOB的电解质不仅有助于在Li金属表面上形成更致密的固-电解质界面，而且还形成增强的阴极电解质界面层，从而有效地防止了阴极界面的腐蚀并减轻了无序现象的形成。循环后的岩盐阶段。这项工作的基本发现突显了认识到电解质添加剂在同时稳定阴极和阳极界面方面的双重作用的重要性，
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