石墨
材料科学
插层(化学)
电化学
无定形固体
离子液体
化学工程
碳纤维
阴极
无定形碳
无机化学
电极
复合数
有机化学
催化作用
化学
冶金
物理化学
复合材料
工程类
作者
Junjun Peng,Nanqing Chen,Rui He,Zhiyong Wang,Sheng Dai,Xianbo Jin
标识
DOI:10.1002/anie.201609565
摘要
Abstract Although, in the carbon family, graphite is the most thermodynamically stable allotrope, conversion of other carbon allotropes, even amorphous carbons, into graphite is extremely hard. We report a simple electrochemical route for the graphitization of amorphous carbons through cathodic polarization in molten CaCl 2 at temperatures of about 1100 K, which generates porous graphite comprising petaloid nanoflakes. This nanostructured graphite allows fast and reversible intercalation/deintercalation of anions, promising a superior cathode material for batteries. In a Pyr 14 TFSI ionic liquid, it exhibits a specific discharge capacity of 65 and 116 mAh g −1 at a rate of 1800 mA g −1 when charged to 5.0 and 5.25 V vs. Li/Li + , respectively. The capacity remains fairly stable during cycling and decreases by only about 8 % when the charge/discharge rate is increased to 10000 mA g −1 during cycling between 2.25 and 5.0 V.
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