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Dual Role of Bis(borate) Additive in Electrode/Electrolyte Interface Layer Construction for High-Voltage NCM 523 Cathode
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-04-18 , DOI: 10.1021/acsaem.3c00250 Yiyao Xiao 1, 2 , Xiaotang Shi 2 , Tianle Zheng 3 , Ye Yue 2, 4 , Siqi Shi 1 , Ya-Jun Cheng 2 , Yonggao Xia 2, 5
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2023-04-18 , DOI: 10.1021/acsaem.3c00250 Yiyao Xiao 1, 2 , Xiaotang Shi 2 , Tianle Zheng 3 , Ye Yue 2, 4 , Siqi Shi 1 , Ya-Jun Cheng 2 , Yonggao Xia 2, 5
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Increasing the working voltage of a layered oxide cathode is an efficient way to lift the energy density of lithium-ion batteries. However, uncontrollable side reactions and excessive electrolyte decomposition take place at high voltage. Bulk cathode structure degradation and formation of a high working voltage induce excessive growth of the solid-electrolyte interface (SEI) layer and overconsumption of the electrolyte. Construction of a high-voltage stable SEI layer is crucial to enhance the electrochemical performance. In this work, trimethylene borate (TMEB) as a borate ester additive is used to improve the cycled stability of NCM523 cells at 4.5 V charging-cutoff voltage. On one hand, TMEB can be preferentially decomposed during cycling and participate in the film formation process on the surfaces of both anode and cathode. On the other hand, TMEB can tune the solvation sheath by expelling the carbonate solvent molecules out of the solvation sheath to suppress decomposition of the electrolyte. The cells cycled with the 0.5 wt % TMEB-containing electrolyte exhibit improved cycling stability after 200 cycles with the capacity retention of 90.9% indicating TMEB to be an effective additive to improve the lithium-ion batteries at higher charging-cutoff voltage.
中文翻译：
双（硼酸盐）添加剂在高压 NCM 523 阴极的电极/电解质界面层构造中的双重作用
提高层状氧化物正极的工作电压是提升锂离子电池能量密度的有效途径。然而，在高电压下会发生不可控的副反应和过度的电解质分解。体阴极结构退化和高工作电压的形成导致固体电解质界面（SEI）层的过度生长和电解质的过度消耗。构建高压稳定的SEI层对于提高电化学性能至关重要。在这项工作中，三亚甲基硼酸酯 (TMEB) 作为硼酸酯添加剂用于提高 NCM523 电池在 4.5 V 充电截止电压下的循环稳定性。一方面，TMEB可以在循环过程中优先分解并参与正极和正极表面的成膜过程。另一方面，TMEB 可以通过将碳酸酯溶剂分子排出溶剂化鞘以抑制电解质分解来调节溶剂化鞘。用含 0.5 wt% TMEB 的电解质循环的电池在 200 次循环后表现出改善的循环稳定性，容量保持率为 90.9%，表明 TMEB 是一种有效的添加剂，可以在更高的充电截止电压下改善锂离子电池。
更新日期：2023-04-18
中文翻译：
双（硼酸盐）添加剂在高压 NCM 523 阴极的电极/电解质界面层构造中的双重作用
提高层状氧化物正极的工作电压是提升锂离子电池能量密度的有效途径。然而，在高电压下会发生不可控的副反应和过度的电解质分解。体阴极结构退化和高工作电压的形成导致固体电解质界面（SEI）层的过度生长和电解质的过度消耗。构建高压稳定的SEI层对于提高电化学性能至关重要。在这项工作中，三亚甲基硼酸酯 (TMEB) 作为硼酸酯添加剂用于提高 NCM523 电池在 4.5 V 充电截止电压下的循环稳定性。一方面，TMEB可以在循环过程中优先分解并参与正极和正极表面的成膜过程。另一方面，TMEB 可以通过将碳酸酯溶剂分子排出溶剂化鞘以抑制电解质分解来调节溶剂化鞘。用含 0.5 wt% TMEB 的电解质循环的电池在 200 次循环后表现出改善的循环稳定性，容量保持率为 90.9%，表明 TMEB 是一种有效的添加剂，可以在更高的充电截止电压下改善锂离子电池。
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