Effect of solid electrolyte interface (SEI) film on cyclic performance of Li4Ti5O12 anodes for Li ion batteries
Effect of solid electrolyte interface (SEI) film on cyclic performance of Li4Ti5O12 anodes for Li ion batteries
复制标题
固体电解质界面（SEI）膜对锂离子电池Li4Ti5O12负极循环性能的影响
DOI：
10.1016/j.jpowsour.2013.03.141
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发表时间：
2013-10-01
影响因子：
9.2
通讯作者：
Kim, Jang-Kyo
中科院分区：
文献类型：
--
作者：
He, Yan-Bing;Liu, Ming;Kim, Jang-Kyo
了解SEI膜在Li 4 Ti 5 O 12（LTO）阳极上的形成为由其制成的锂离子电池的大规模应用提供了主要益处。这篇论文揭示了由于电极和电解质之间的界面反应，在1 V以上形成SEI膜：LTO阳极先前被认为在1 V和3 V之间循环时没有SEI膜。SEI膜的反应性和形成受到电极的形态和表面积的很大影响。为了研究上述问题，以醋酸锂（LA）和氢氧化锂（LH）为锂源，合成了不同形貌的LTO粉末。由具有大表面积的初级小颗粒的附聚物组成的LTO-LH具有比具有立方结构和小表面积的LTO-LA更高的反应性。因此，具有光滑SEI膜的LT 0-LH阳极提供比具有多孔SEI膜的LT 0-LA阳极更好的循环性能。在电解液中加入碳酸亚乙烯酯有利于在LTO LA上快速形成保护性的SEI膜，大大改善了速率和循环性能：在10 C下记录了155.6mAh g（-1）的稳定比容量和在500次循环后的显著的135.2mAh g（-1）。(C)2013 Elsevier B. V.保留所有权利。
Understanding the formation of SEI films on Li4Ti5O12 (LTO) anodes offers a major benefit to large-scale applications of lithium ion batteries made therefrom. This paper reveals that an SEI film is formed above 1 V due to the interfacial reaction between the electrode and electrolyte: LTO anodes are previously considered free from SEI films when cycled between 1 and 3 V. The reactivity and the formation of SEI films are much affected by the morphology and surface area of the electrode. To study the above, LTO powders with different morphologies are synthesized using lithium acetate (LA) and lithium hydroxide (LH) as the lithium sources. LTO-LH consisting of agglomerates of primary small particles with a large surface area has higher reactivity than LTO-LA with a cubic structure and small surface area. As a result, the LTO-LH anode with a smooth SEI film offers better cyclic performance than the LTO-LA anode with a porous SEI film. The addition of vinylene carbonate to the electrolyte facilitates rapid formation of a protective SEI film on LTO LA, greatly improving the rate and cyclic performance: stable specific capacity of 155.6 mAh g(-1) and remarkable 135.2 mAh g(-1) after 500 cycles at 10 C are recorded. (C) 2013 Elsevier B.V. All rights reserved.