Study of the Reaction of Lithium with Isostructural A 2 B and Various Al x B Alloys
Study of the Reaction of Lithium with Isostructural A 2 B and Various Al x B Alloys
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DOI：
10.1149/1.1393421
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发表时间：
2000-05
影响因子：
3.9
通讯作者：
D. Larcher;L. Y. Beaulieu;O. Mao;A. E. George;J. Dahn
中科院分区：
文献类型：
--
作者：
D. Larcher;L. Y. Beaulieu;O. Mao;A. E. George;J. Dahn
The electrochemical alloying reaction of Li with isostructural A{sub 2}B and Al-based alloys has been investigated. The binary A{sub 2}B alloys the authors selected (Sb{sub 2}Ti, Sb{sub 2}V, Sn{sub 2}Co, Sn{sub 2}Mn, Sn{sub 2}Fe, Al{sub 2}Cu, and Ge{sub 2}Fe) are isostructural (Al{sub 2}Cu type) and comprise an active element (A) that alloys with lithium, and an inactive one (B) that does not. These compounds were prepared by mechanical alloying and have small grain size (10--20 nm). With the exception of Al{sub 2}Cu, the authors observed a full reaction of A with lithium (A{sub 2}B + 2xLi {yields} B + 2Li{sub x}A, where the theoretical values of x are 1 for Al, 3 for Sb, and 4.4 for Si, Ge, and Sn). Extremely slow electrochemical cycling at 55 C and potentiostatic tests at lithium potential proved the total inactivity of the Al{sub 2}Cu vs. lithium. However, thermodynamic considerations predict that the reaction of Al{sub 2}Cu with Li should occur and that the formation of LiAl should be observed. Other Al-transition metal intermetallics were studied and were also found to be inert toward Li, suggesting that the Al-transition metal bond has unique features.
The electrochemical alloying reaction of Li with isostructural A{sub 2}B and Al-based alloys has been investigated. The binary A{sub 2}B alloys the authors selected (Sb{sub 2}Ti, Sb{sub 2}V, Sn{sub 2}Co, Sn{sub 2}Mn, Sn{sub 2}Fe, Al{sub 2}Cu, and Ge{sub 2}Fe) are isostructural (Al{sub 2}Cu type) and comprise an active element (A) that alloys with lithium, and an inactive one (B) that does not. These compounds were prepared by mechanical alloying and have small grain size (10--20 nm). With the exception of Al{sub 2}Cu, the authors observed a full reaction of A with lithium (A{sub 2}B + 2xLi {yields} B + 2Li{sub x}A, where the theoretical values of x are 1 for Al, 3 for Sb, and 4.4 for Si, Ge, and Sn). Extremely slow electrochemical cycling at 55 C and potentiostatic tests at lithium potential proved the total inactivity of the Al{sub 2}Cu vs. lithium. However, thermodynamic considerations predict that the reaction of Al{sub 2}Cu with Li should occur and that the formation of LiAl should be observed. Other Al-transition metal intermetallics were studied and were also found to be inert toward Li, suggesting that the Al-transition metal bond has unique features.