Nonflammable Localized High-Concentration Electrolytes with Long-Term Cycling Stability for High-Performance Li Metal Batteries,ACS Applied Materials & Interfaces

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Nonflammable Localized High-Concentration Electrolytes with Long-Term Cycling Stability for High-Performance Li Metal Batteries
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2022-10-24 , DOI: 10.1021/acsami.2c13922
Zelin Xu ₁ , Kuirong Deng ₁ , Suping Zhou ₁ , Zheng Liu ₁ , Xiongcong Guan ₁ , Daize Mo ₁

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High-concentration electrolytes (HCEs) can effectively enhance interface stability and cycle performance of Li metal batteries (LMBs). However, HCEs suffer from low ionic conductivity, high viscosity, high cost, and high density. Herein, fluorobenzene (FB) diluted localized high-concentration electrolytes (LHCEs) consisting of lithium bis(fluorosulfonyl)imide (LiFSI)/triethyl phosphate (TEP)/FB are developed. 2.3 M LHCE can reserve concentrated Li⁺–FSI^––TEP solvation structures. Diluent FB possesses low density, low viscosity, low cost, low dielectric constant, low LUMO, and a good fluorine-donating property, which can significantly reduce viscosity, improve ionic conductivity, promote the formation of LiF-rich SEI, and enhance interaction of Li⁺–TEP and Li⁺–FSI^– ion-pairs of the electrolytes. 2.3 M LHCE is a highly safe nonflammable electrolyte. 2.3 M LHCE can effectively inhibit dendrite growth on Li metal anode. 2.3 M LHCE endows LiFePO₄ cells with good rate capability (discharge capacity of 112.7 mAh g^–1 at 5 C rate) and excellent cycling performance (capacity retention of 95.4% after 1000 cycles). 2.3 M LHCE also shows good compatibility with LiNi_0.8Co_0.1Mn_0.1O₂ and exhibits outstanding cycle stability (capacity retention of 86.4% after 500 cycles). Therefore, 2.3 M LHCE is a promising electrolyte for practical applications in LMBs.

中文翻译：

用于高性能锂金属电池的具有长期循环稳定性的不可燃局部高浓度电解质

高浓度电解质（HCEs）可以有效提高锂金属电池（LMBs）的界面稳定性和循环性能。然而，HCEs 具有低离子电导率、高粘度、高成本和高密度的缺点。在此，开发了由双（氟磺酰基）亚胺锂（LiFSI）/磷酸三乙酯（TEP）/FB组成的氟苯（FB）稀释的局部高浓度电解质（LHCE）。2.3 M LHCE 可以保留浓缩的 Li ⁺ –FSI ^– –TEP 溶剂化结构。稀释剂FB具有低密度、低粘度、低成本、低介电常数、低LUMO和良好的供氟性能，可显着降低粘度，提高离子电导率，促进富LiF SEI的形成，增强与Li ⁺ -TEP 和 Li⁺ –FSI ^–电解质的离子对。2.3 M LHCE 是一种高度安全的不易燃电解质。2.3 M LHCE可以有效抑制锂金属负极上的枝晶生长。2.3 M LHCE赋予LiFePO ₄电池良好的倍率性能（5 C倍率下的放电容量为112.7 mAh g ^-1）和出色的循环性能（1000次循环后容量保持率为95.4%）。2.3 M LHCE还表现出与LiNi _0.8 Co _0.1 Mn _0.1 O ₂的良好相容性，并表现出出色的循环稳定性（500次循环后容量保持率为86.4%）。因此，2.3 M LHCE 是一种在 LMB 中具有实际应用前景的电解质。

更新日期：2022-10-24

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