期刊
NANO LETTERS
卷 13, 期 11, 页码 5289-5296出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl402810d
关键词
Built-in electric field; surface-amorphized nanocsystals; titanium dioxide; lithium-ion battery
类别
资金
- College of Arts and Sciences, University of Missouri-Kansas City, University of Missouri Research Board
- University of Missouri Research Board
- Office of Vehicle Technologies of the United States Department of Energy [DE-AC03-76SF00098]
High-power batteries require fast charge/discharge rates and high capacity besides safe operation. TiO2 has been investigated as a safer alternative candidate to the current graphite or incoming silicon anodes due to higher redox potentials in effectively preventing lithium deposition. However, its charge/discharge rates. are reluctant to improve due to poor ion diffusion coefficients, and its capacity fades quickly with rate as only thinner surface layers can be effectively used in faster charge/discharge processes. Here, we demonstrate that surface-amorphized TiO2 nanocrystals greatly improve lithium-ion rechargeable battery performance: 20 times rate and 340% capacity improvement over crystalline TiO2 nanocrystals. This improvement is benefited from the built-in electric field within the nanocrystals that induces much lower lithium-ion diffusion resistance and facilitates its transport in both insertion and extraction processes. This concept thus offers an innovative and general approach toward designing battery materials with better 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