In situ TEM observation of buffering the anode volume change by using NiTi alloy during electrochemical lithiation/delithiation
In situ TEM observation of buffering the anode volume change by using NiTi alloy during electrochemical lithiation/delithiation
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NiTi合金在电化学锂化/脱锂过程中缓冲阳极体积变化的原位TEM观察
DOI：
10.1088/0957-4484/24/32/325702
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发表时间：
2013-07
期刊：
影响因子：
3.5
通讯作者：
Cui, L. S.
中科院分区：
文献类型：
--
作者：
Zhang, L. Q.;Zhang, J. S.;Shao, Y.;Jiang, D. Q.;Yang, F.;Guo, Y. P.;Cui, L. S.
采用电弧熔炼法制备了一种新型的三明治结构Ti 3Sn/NiTi形状记忆合金阳极。为了原位表征Ti 3Sn/NiTi负极在循环过程中的微观结构变化和相变，在透射电子显微镜内建立了纳米锂电池，该电池由金属Li作为阴极，金属Li表面的天然Li 2 O层作为固体电解质，Ti 3Sn/NiTi作为负极组成。只有Ti 3Sn金属间化合物经历了电化学反应，而NiTi合金（与Li+不活泼）被施加用于缓冲循环期间的Ti 3Sn体积变化。Ti_3Sn在锂化过程中有明显的反应前沿从一端向另一端迁移，脱锂后也可以返回。这为NiTi合金在电化学锂化和脱锂过程中能够有效地适应阳极体积变化提供了直接证据。
A novel Ti3Sn/NiTi shape memory alloy anode with a sandwich structure was fabricated by arc melting. In order to characterize in situ the Ti3Sn/NiTi anode microstructure changes and phase transformations during cycling, a nanoscale lithium battery was set up inside a transmission electron microscope, which consists of Li metal as the cathode, the native Li2O layer on the surface of Li metal as the solid electrolyte, and the Ti3Sn/NiTi as the anode. Only the Ti3Sn intermetallic compound experienced the electrochemical reaction, while the NiTi alloy (inactive with Li+) was applied for buffering the Ti3Sn volume change during cycling. An obvious reaction front of Ti3Sn migrated from one end to the other during lithiation, which can also return after delithiation. It provides direct evidence that the NiTi alloy can effectively accommodate the anode volume change during electrochemical lithiation and delithiation.
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