期刊
NANO LETTERS
卷 11, 期 6, 页码 2251-2258出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl200412p
关键词
Silicon nanowire; lithium ion battery; fast lithiation; carbon coating; doping
类别
资金
- Sandia National Laboratories (SNL)
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DESC0001160]
- U.S. Department of Energy's National Nuclear Security Administration [DE-AC04-94AL85000]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [0825842] Funding Source: National Science Foundation
Using advanced in situ transmission electron microscopy, we show that the addition of a carbon coating combined with heavy doping leads to record-high charging rates in silicon nanowires. The carbon coating and phosphorus doping each resulted in a 2 to 3 orders of magnitude increase in electrical conductivity of the nanowires that, in turn, resulted in a 1 order of magnitude increase in charging rate. In addition, electrochemical solid-state amorphization (ESA) and inverse ESA were directly observed and characterized during a two-step phase transformation process during lithiation: crystalline silicon (Si) transforming to amorphous lithium-silicon (Li(x)Si) which transforms to crystalline Li(15)Si(4) (capacity 3579 mAh.g(-1)). The ultrafast charging rate is attributed to the nanoscale diffusion length and the improved electron and ion transport. These results provide important insight in how to use Si as a high energy density and high power density anode in lithium ion batteries for electrical vehicle and other electronic power source applications.
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