电解质
碳酸乙烯酯
二甲氧基乙烷
电池(电)
锂(药物)
电化学
锂离子电池
无机化学
三元运算
化学工程
分析化学(期刊)
化学
电极
有机化学
物理化学
功率(物理)
内分泌学
工程类
物理
医学
量子力学
计算机科学
程序设计语言
作者
Jun Yang,Xing Li,Ke Qu,Yixian Wang,Kangqi Shen,Changhuan Jiang,Bo Yu,Pan Luo,Zhuangzhi Li,Mingyang Chen,Bingshu Guo,Mingshan Wang,Junchen Chen,Zhiyuan Ma,Yun Huang,Zhenzhong Yang,Pengcheng Liu,Rong Huang,Xiaodi Ren,David Mitlin
摘要
Abstract A new concentrated ternary salt ether‐based electrolyte enables stable cycling of lithium metal battery (LMB) cells with high‐mass‐loading (13.8 mg cm −2 , 2.5 mAh cm −2 ) NMC622 (LiNi 0.6 Co 0.2 Mn 0.2 O 2 ) cathodes and 50 μm Li anodes. Termed “CETHER‐3,” this electrolyte is based on LiTFSI, LiDFOB, and LiBF 4 with 5 vol% fluorinated ethylene carbonate in 1,2‐dimethoxyethane. Commercial carbonate and state‐of‐the‐art binary salt ether electrolytes were also tested as baselines. With CETHER‐3, the electrochemical performance of the full‐cell battery is among the most favorably reported in terms of high‐voltage cycling stability. For example, LiNi x Mn y Co 1– x – y O 2 (NMC)‐Li metal cells retain 80% capacity at 430 cycles with a 4.4 V cut‐off and 83% capacity at 100 cycles with a 4.5 V cut‐off (charge at C/5, discharge at C/2). According to simulation by density functional theory and molecular dynamics, this favorable performance is an outcome of enhanced coordination between Li + and the solvent/salt molecules. Combining advanced microscopy (high‐resolution transmission electron microscopy, scanning electron microscopy) and surface science (X‐ray photoelectron spectroscopy, time‐of‐fight secondary ion mass spectroscopy, Fourier‐transform infrared spectroscopy, Raman spectroscopy), it is demonstrated that a thinner and more stable cathode electrolyte interphase (CEI) and solid electrolyte interphase (SEI) are formed. The CEI is rich in lithium sulfide (Li 2 SO 3 ), while the SEI is rich in Li 3 N and LiF. During cycling, the CEI/SEI suppresses both the deleterious transformation of the cathode R‐3m layered near‐surface structure into disordered rock salt and the growth of lithium metal dendrites.
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