In situ electrochemical dilatometry study of capacity fading in nanoporous Ge-based Na-ion battery anodes
In situ electrochemical dilatometry study of capacity fading in nanoporous Ge-based Na-ion battery anodes
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DOI：
10.1016/j.scriptamat.2019.01.030
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发表时间：
2019-04-15
影响因子：
6
通讯作者：
Detsi, Eric
中科院分区：
文献类型：
--
作者：
Li, Manni;Wang, Zeyu;Detsi, Eric
结果表明，晶态纳米多孔锗只能部分储存钠，钠化产物为非晶态NaxGe。电化学阻抗测量技术被用来测量相应的钠化（脱）诱导的应变。发现容量和应变振幅在长期循环期间表现出相同的衰减趋势，这是预期的，因为容量衰减是由于循环期间产生的体积变化。然而，从不同的角度来看，容量衰减和应变衰减之间的相似性表明，减轻这种容量衰减的一种方法可能是防止初始应变衰减，而不是消除这种应变。(C)2019 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
It is found that crystalline nanoporous Ge can only partially store sodium, with amorphous NaxGe as the sodiation product. Electrochemical dilatometry techniques were used to measure the corresponding (de)sodiation-induced strains. The capacity and strain amplitude were found to exhibit the same decay trend during long-term cycling, which is expected since the capacity fades because of the volume changes arising during cycling. However, viewed from a different perspective, the similarity between capacity fading and strain decay suggests that one way to mitigate this capacity fading might be by preventing the initial strain from decaying, instead of getting rid of this strain. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.