Dendritic growth mechanisms in lithium/polymer cells
Dendritic growth mechanisms in lithium/polymer cells
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DOI：
10.1016/s0378-7753(98)00242-0
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发表时间：
1999-09-01
影响因子：
9.2
通讯作者：
Lascaud, S
中科院分区：
文献类型：
--
作者：
Brissot, C;Rosso, M;Lascaud, S
在恒电流条件下，在对称锂/PEO-LiTFSI 电池中直接原位观察了锂的枝晶电沉积。我们的实验装置使我们能够同时测量电池电位的变化、树突的演化以及树突周围电解质中离子浓度的变化。根据电流密度，我们观察到两种不同的枝晶生长机制：在高电流密度下，当负极上的离子浓度降至零时，枝晶开始生长，而在低电流密度下，局部不均匀性似乎起着主要作用。 (C) 1999 Elsevier Science S.A. 保留所有权利。
Direct in situ observation of dendritic electrodeposition of lithium has been performed in symmetrical lithium/PEO-LiTFSI cells under galvanostatic conditions. Our experimental set-up allows us to measure simultaneously the variation of the cell potential, the evolution of the dendrites, and the variation of the ionic concentration in the electrolyte around the dendrites. Depending on current density, we observe two different regimes for the dendritic growth: at high current density, dendrites start when the ionic concentrations drop to zero at the negative electrode, whereas at low current density, local inhomogeneities seem to play a major role. (C) 1999 Elsevier Science S.A. All rights reserved.