材料科学
纳米-
兴奋剂
金属
阳极
纳米技术
脚手架
碳纤维
激光器
过程(计算)
化学工程
冶金
复合材料
光电子学
化学
计算机科学
光学
电极
物理化学
工程类
物理
操作系统
复合数
数据库
作者
Dhanya Puthusseri,Malik Wahid,Aniruddha Basu,Rohit Babar,Mukul Kabir,Satishchandra Ogale
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:10 (16): 7630-7638
被引量:19
摘要
Li metal is the most promising choice for anode in high-energy rechargeable batteries, but the dendrite growth upon cycling leads to safety concerns and poor cycle life. Herein, we demonstrate a novel and scalable approach for direct writing of a thin layer of carbon nano-onions on copper substrate to stabilize the Li metal anode and prevent the dendrite growth. The F-doped carbon nano-onion film (F-CNOF) scaffold enables reversible electroplating for over 1500 hours (300 cycles) with a coulombic efficiency of ∼100%. The F-CNOF is capable of depositing Li equivalent to a capacity of 10 mA h cm-2 (gravimetric capacity 3218 mA h g-1) at 1 mA cm-2, operating at a high current density of 6 mA cm-2. More importantly, these features of long-term cyclic stability and excellent rate capability are attributed to the very high curvature due to nano dimension (∼108 m-1) of the nano-onions that develop a very uniform Li flux due to the negative surface charge, thus preventing the dendrite formation. We have also shown via first-principles DFT calculations that the high curvature achieved herein can significantly enhance the binding energy of Li to the carbon surface, which helps to improve lithiophilicity. A full cell fabricated using Li4Ti5O12 as the positive electrode showed cyclic stability of 450 cycles.
科研通智能强力驱动
Strongly Powered by AbleSci AI