材料科学
热解炭
石墨
各向同性
锂(药物)
碳纤维
球体
复合材料
涂层
导电体
阳极
化学工程
电极
复合数
热解
光学
物理
工程类
内分泌学
物理化学
医学
化学
天文
作者
Xuan Wu,Xuelin Yang,Fei Zhang,Liangting Cai,Lulu Zhang,Zhaoyin Wen
标识
DOI:10.1016/j.ceramint.2017.04.123
摘要
Carbon coated isotropic natural graphite spheres (INGS/C) has been prepared by spray granulation using the by-product of spherical natural graphite (i.e., superfine graphite powders) as starting materials. In INGS/C, small graphite flakes are packed in disordered orientation and form an isotropic structure, which may effectively reduce local stress concentration appearing in the process of Li+ insertion/extraction. The pyrolytic carbon decomposed from polyvinyl alcohol (PVA) and citric acid is connecting the small graphite flakes and coating on the surface of INGS, respectively, thus forms a continuous conductive network to improve the electron transmission and maintain the micro-structural integrity of isotropic natural graphite spheres as well. With the help of synergetic effect between the isotropic structure of INGS and the continuous conductive network, the INGS/C electrode exhibits superior rate capability of 346 mA h g−1 at 3 C at low potential below 0.25 V.
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