Surface condition changes in lithium metal deposited in nonaqueous electrolyte containing HF by dissolution-deposition cycles
Surface condition changes in lithium metal deposited in nonaqueous electrolyte containing HF by dissolution-deposition cycles
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DOI：
10.1149/1.1391818
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发表时间：
1999-05-01
影响因子：
3.9
通讯作者：
Takehara, Z
中科院分区：
文献类型：
--
作者：
Shiraishi, S;Kanamura, K;Takehara, Z
研究了金属锂在含少量HF的非水电解液中电沉积的溶解-沉积循环行为。在第一次沉积过程中，在含有HE的1.0M LiCF 3SO 3/碳酸亚丙酯中，将具有光滑半球形状的Li颗粒沉积在Ni上。这些精细Li颗粒的形态是由于经由Li+离子通过由LiF/Li 2 O双层组成的薄且致密的表面膜的迁移的电沉积，所述表面膜经由HE的表面改性产生。在Ni基底的整个表面上观察到残留膜。这种残留膜是由Li颗粒表面的膜形成的。此外，在循环过程中，残留膜不断在电极上积累。另一方面，发现在循环期间Li沉积-溶解的库仑效率通过添加HE而大大提高。不幸的是，在第45次循环之后观察到树枝状Li的形成，这表明Li表面上积累的厚残余膜抑制了在沉积过程期间KF向Li表面的供应。(C)1999年电化学学会。S0013-4651（98）08-106-3。All rights reserved.
The dissolution-deposition cycle behavior of Li metal electrodeposited in nonaqueous electrolyte containing a small amount of HF was investigated. In the first deposition process, Li particles with a smooth hemispherical shape were deposited on Ni in 1.0 M LiCF3SO3/propylene carbonate containing HE The morphology of these fine Li particles is due to electrodeposition via migration of Li+ ions through a thin and compact surface film consisting of a LiF/Li2O bilayer, which was produced via surface modification by HE After the first dissolution process, a residual film was observed on the entire surface of the Ni substrate. This' residual film is derived from the surface film on the Li particles. Moreover, the residual film continuously accumulated on the electrode during the cycling. On the other hand, it was found that the coulombic efficiency of Li deposition-dissolution during cycling was much improved by the addition of HE Unfortunately, the formation of dendritic Li was observed after the 45th cycle, suggesting that the accumulated thick residual film on the Li surface inhibits the supply of KF to the Li surface during the deposition process. (C) 1999 The Electrochemical Society. S0013-4651(98)08-106-3. All rights reserved.