期刊
ACS APPLIED MATERIALS & INTERFACES
卷 14, 期 18, 页码 20896-20906出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c01616
关键词
metaphosphate-bridged interface; chemical bond; charge transfer; reversibility; lithium storage
资金
- Fund of the Natural Science Foundation of Guizhou Province [ZK 2022-044]
- Fund of the Fok Ying Tung Education Foundation
- Major Research Project of the Innovative Group of Guizhou Province [2018-013]
- National Science Foundation of China [52101010, 11964006]
- Fund of Natural Science Special (Special Post) Research Foundation of Guizhou University [2021-018]
In this study, tin oxide/carbon composites with a metaphosphate-bridged interface were synthesized to improve the interfacial contact between tin oxides and carbon, thereby enhancing lithium-storage performance. The formation of the metaphosphate-bridged interface provided a steady transport channel, enhanced charge transfer and interaction, leading to higher SnOx utilization.
Carbon materials with well-dispersed SnOx particles exhibit excellent lithium-storage performance. However, the volume change of SnOx and the weak interaction between SnOx and carbon induce an unsteady SnOx-C interface during the lithiation/delithiation process. This phenomenon results in enhanced charge transfer resistance and reduced electrical contact of active materials, which leads to low reversibility of tin oxidation, restricted capacity, sluggish kinetics, structural deterioration, and rapid capacity decay. Herein, tin oxide/carbon composites with a metaphosphate-bridged interface are synthesized to construct a robust interfacial contact between tin oxides and carbon. The metaphosphate group functions as a bridge between SnOx and carbon and results in excellent electrochemical stability during the charge/discharge process, which is favorable for electrode structural integrity. The formation of the metaphosphate-bridged interface provides a steady transport channel for Car and thus improves the reversibility of the conversion reaction. The enhanced charge transfer and interaction can also boost the charge transfer between SnOx and carbon, which leads to higher SnOx utilization. Thus, the prepared P-SnOx/C anode exhibits enhanced lithium-storage performance in terms of specific capacity, cycling stability, and rate performance.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据