改善锂离子电池中单晶lini0.83 co0.11 mn0.060 o2高压运行的电解质优化

IF 4.6 4区 化学 Q2 ELECTROCHEMISTRY
Batteries Pub Date : 2023-10-25 DOI:10.3390/batteries9110528
Wengao Zhao, Mayan Si, Kuan Wang, Enzo Brack, Ziyan Zhang, Xinming Fan, Corsin Battaglia
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引用次数: 0

摘要

单晶富镍层状氧化物材料LiNi1−x−yCoxMnyO2 (NCM, 1 - x−y≥0.6)正成为极有前途的正极材料,由于缺乏晶界和体结构的各向异性,它不会出现晶间裂纹,从而在高压下工作的锂离子电池(LIBs)中具有扩展的可循环性。然而,SC-NCM材料在长时间循环后仍然存在容量衰减的问题。这种能力的退化可归因于表面的重建。从层状结构到无序尖晶石/岩盐结构的相变是导致阻抗增长和容量损失的原因。成膜添加剂是通过在阴极表面形成坚固的保护层来减缓表面重建的直接方法。本文研究了不同添加剂对单晶lini0.83 co0.11 mn0.060 o2 (SC-NCM83)电化学性能的影响。结果表明,与基线电解质(72.7%)以及分别使用1%二氟草酸锂(90.5%)或1% LiPO2F2(88.3%)的电解质相比,使用1%二氟草酸锂硼酸盐(LiDFOB)和1%二氟磷酸锂(LiPO2F2)添加剂显著提高了循环性能(150次循环后容量保留率为93.6%)和倍率能力。使用这两种添加剂的组合,电池具有优异的循环稳定性,这归因于形成了一个共形阴极/电解质界面(CEI)层,导致了稳定的体结构和长期循环时的阻抗降低,这一点通过最先进的分析技术的组合得到了证明。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electrolyte Optimization to Improve the High-Voltage Operation of Single-Crystal LiNi0.83Co0.11Mn0.06O2 in Lithium-Ion Batteries
Single-crystal Ni-rich layered oxide materials LiNi1−x−yCoxMnyO2 (NCM, 1 – x − y ≥ 0.6) are emerging as promising cathode materials that do not show intergranular cracks as a result of the lack of grain boundaries and anisotropy of the bulk structure, enabling extended cyclability in lithium-ion batteries (LIBs) operating at high voltage. However, SC-NCM materials still suffer from capacity fading upon extended cycling. This degradation of capacity can be attributed to a reconstruction of the surface. A phase transformation from layered structures to disordered spinel/rock-salt structures was found to be responsible for impedance growth and capacity loss. Film-forming additives are a straightforward approach for the mitigation of surface reconstruction via the formation of a robust protection layer at the cathode’s surface. In this work, we investigate various additives on the electrochemical performance of single-crystal LiNi0.83Co0.11Mn0.06O2 (SC-NCM83). The results demonstrate that the use of 1% lithium difluoroxalate borate (LiDFOB) and 1% lithium difluorophosphate (LiPO2F2) additives substantially enhanced the cycling performance (with a capacity retention of 93.6% after 150 cycles) and rate capability in comparison to the baseline electrolyte (72.7%) as well as electrolytes using 1% LiDFOB (90.5%) or 1% LiPO2F2 (88.3%) individually. The superior cycling stability of the cell using the combination of both additives was attributed to the formation of a conformal cathode/electrolyte interface (CEI) layer, resulting in a stabilized bulk structure and decreased impedance upon long-term cycling, as evidenced via a combination of state-of-the-art analytical techniques.
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来源期刊
Batteries
Batteries Energy-Energy Engineering and Power Technology
CiteScore
4.00
自引率
15.00%
发文量
217
审稿时长
7 weeks
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