Deciphering the lithium storage chemistry in flexible carbon fiber-based self-supportive electrodes  

作　　者：Hao Yang Tuzhi Xiong Zhixiao Zhu Ran Xiao Xincheng Yao Yongchao Huang M.-Sadeeq Balogun 

机构地区：[1]College of Materials Science and Engineering,Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Hunan University,Changsha,People's Republic of China [2]Guangxi Key Laboratory of Electrochemical Energy Materials,School of Chemistry&Chemical Engineering,Guangxi University,Nanning,People's Republic of China [3]Key Laboratory for Water Quality and Conservation of the Pearl River Delta,Institute of Environmental Research at Greater Bay,Ministry of Education,Guangzhou University,Guangzhou,China

出　　处：《Carbon Energy》2022年第5期820-832,共13页碳能源（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Numbers:21875292,21902188;National Key Research and Development Program of China,Grant/Award Number:2019YFA0705702;Hunan Provincial Natural Science Foundation,Grant/Award Number:2021JJ30087;Natural Science Foundation of Guangdong Province,Grant/Award Number:2020A1515010798;Hunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy,Grant/Award Number:2020CB1007。

摘　　要：Flexible carbon fiber cloth(CFC)is an important scaffold and/or current collector for active materials in the development of flexible self-supportive electrode materials(SSEMs),especially in lithium-ion batteries.However,during the intercalation of Li ions into the matrix of CFC(below 0.5 V vs.Li/Li+),the incompatibility in the capacity of the CFC,when used directly as an anode material or as a current collector for active materials,leads to difficulty in the estimation of its actual contribution.To address this issue,we prepared Ni_(5)P_(4)nanosheets on CFC(denoted CFC@Ni_(5)P_(4))and investigated the contribution of CFC in the CFC@Ni_(5)P_(4)by comparing to the powder Ni_(5)P_(4)nanosheets traditionally coated on a copper foil(CuF)(denoted P-Ni_(5)P_(4)).At a current density of 0.4 mA cm^(−2),the as-prepared CFC@Ni_(5)P_(4)showed an areal capacity of 7.38 mAh cm^(−2),which is significantly higher than that of the PNi_(5)P_(4)electrode.More importantly,theoretical studies revealed that the CFC has a high Li adsorption energy that contributes to the low Li-ion diffusion energy barrier of the Ni_(5)P_(4)due to the strong interaction between the CFC and Ni_(5)P_(4),leading to the superior Li-ion storage performance of the CFC@Ni_(5)P_(4)over the pristine Ni_(5)P_(4)sample.This present work unveils the underlying mechanism leading to the achievement of high performance in SSEMs.

关 键 词：density functional theory flexible carbon fiber cloth lithium-ion batteries Ni5P4 self-supportive electrodes 

分 类 号：TM912[电气工程—电力电子与电力传动]