Formulating a Non-Flammable Highly Concentrated Dual-Salt Electrolyte for Wide Temperature High-Nickel Lithium Ion Batteries
Formulating a Non-Flammable Highly Concentrated Dual-Salt Electrolyte for Wide Temperature High-Nickel Lithium Ion Batteries
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DOI：
10.1149/1945-7111/abfb39
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发表时间：
2021-05
影响因子：
3.9
通讯作者：
Min Zhao;Gaojie Xu;Di Lu;Bin Xie;Lang Huang;Wei Wang;G. Cui
中科院分区：
文献类型：
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作者：
Min Zhao;Gaojie Xu;Di Lu;Bin Xie;Lang Huang;Wei Wang;G. Cui
随着锂离子电池能量密度的不断提高，其安全性问题引起了人们的极大关注。众所周知，电解质在确定lib的安全性方面起着至关重要的作用。在这里，通过在三甲基磷酸（TMP）和γ -丁内酯（GBL）中溶解2 M双氟（三氟甲烷磺酰）亚胺锂（LiTFSI）和2 M二氟（草酸）硼酸锂（LiDFOB），配制出一种不易燃的高浓度双盐电解质。令人鼓舞的是，这种精心定制的浓缩双盐电解质与LiNi 0.6 Co . 0.2 Mn . 0.2 O 2 (NCM622)/介碳微珠（MCMB）、LiNi 0.8 Co . 0.1 Mn . 0.1 O 2 (NCM811)/MCMB、LiNi 0.8 Co . 0.15 Al . 0.05 O 2 (NCA)/MCMB的高镍锂电池体系具有很高的相容性。特别是，使用这种电解质的NCM622/MCMB全电池在宽温度范围（- 30℃~ 90℃）内具有优异的电化学性能。结果表明，热稳定双盐的LiTFSI和LiDFOB将在电极界面上形成良好的协同效应。本文将指导下一代高能高镍锂离子电池高安全电解质的配方。
With the ever-increasing energy density of lithium ion batteries (LIBs), the safety concerns have aroused great interests. It is well known that electrolytes play a crucial role in determining the safety of LIBs. Here, a non-flammable highly concentrated dual-salt electrolyte is formulated by dissolving 2 M lithium bis (trifluoromethanesulfonyl) imide (LiTFSI) and 2 M lithium difluoro (oxalate) borate (LiDFOB) in trimethyl phosphate (TMP) and gamma-butyrolactone (GBL). Encouragingly, this delicately tailored concentrated dual-salt electrolyte possesses high compatibility with high-nickel LIB systems of LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622)/mesocarbon microbeads (MCMB), LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811)/MCMB, LiNi 0.8 Co 0.15 Al 0.05 O 2 (NCA)/MCMB. Especially, NCM622/MCMB full cell using this electrolyte delivers excellent electrochemical performances over a wide temperature range (− 30 C∼ 90 C). It is revealed that thermally stable dual-salt of LiTFSI and LiDFOB will form favorable synergistic effects on electrode interfaces. This paper will guide the formulation of highly safe electrolytes for next generation high energy high nickel LIBs.