Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages
文献类型：期刊论文
| 作者 | Jia, Guofeng ; Liu, Suqin; Yang, Guowei; Li, Faqiang; Wu, Kang; He, Zhen; Shangguan, Xuehui
|
| 刊名 | IONICS
 |
| 出版日期 | 2019-02 |
| 卷号 | 25期号:2页码:399-410 |
| ISSN号 | 0947-7047 |
| DOI | 10.1007/s11581-018-2832-8 |
| 英文摘要 | To improve the cycle performance, zLi(2)TiO(3)@LiNi0.5Mn0.5O2 (z=0, 1, 3 and 5mol%) (@ means was coated on the surface of) cathode materials have been successfully prepared via a syn-lithiation strategy. The high-resolution transmission electron microscope (HRTEM) structural analysis results show that Li2TiO3 is evenly coated on the surface of LiNi0.5Mn0.5O2, with the thickness of the coating layer of approximately 10nm. The electrochemical characterizations of the synthesized zLi(2)TiO(3)@LiNi0.5Mn0.5O2 suggest that 1mol% Li2TiO3@LiNi0.5Mn0.5O2 electrode shows the best electrochemical performance, including the highest capacity and best cycle stability and rate performance. The capacity retention at 25 degrees C is improved by approximately 23% by the 1mol% Li2TiO3 coating. The improved cycling performance of LiNi0.5Mn0.5O2 arises from the presence of the Li2TiO3 surface layer, which suppresses the direct contact between the active materials and the electrolytes, enhances the lithium ion diffusion through the electrode/electrolyte interface, expands the BET area, stabilizes the structure and prevents the pulverization of the active materials during repeated charging/discharging. The XPS results showed that Li2TiO3 coating layer could inhibit electrolyte decomposition, and the decomposition of electrolyte on the surface of coating electrode is different from that of LiNi0.5Mn0.5O2 electrode. |
| 源URL | [http://ir.isl.ac.cn/handle/363002/34088]  |
| 专题 | 青海盐湖研究所_盐湖资源与化学实验室 中国科学院青海盐湖研究所 |
| 推荐引用方式 GB/T 7714 | Jia, Guofeng,Liu, Suqin,Yang, Guowei,et al. Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages[J]. IONICS,2019,25(2):399-410. |
| APA | Jia, Guofeng.,Liu, Suqin.,Yang, Guowei.,Li, Faqiang.,Wu, Kang.,...&Shangguan, Xuehui.(2019).Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages.IONICS,25(2),399-410. |
| MLA | Jia, Guofeng,et al."Effects of Li2TiO3 coating on the structure and the electrochemical properties of LiNi0.5Mn0.5O2 cathode materials at high voltages".IONICS 25.2(2019):399-410. |
入库方式： OAI收割
来源：青海盐湖研究所
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