Design of hierarchical and mesoporous FeF_(3)/rGO hybrids as cathodes for superior lithium-ion batteries  

作　　者：Jiale Lian Yang Wu Yichuan Guo Zhenyun Zhao Qinghua Zhang Yang Hou Lingxiang Chen Bin Lu Xinhua Pan Zhizhen Ye Jianguo Lu 

机构地区：[1]State Key Laboratory of Silicon Materials,Key Laboratory for Biomedical Engineering of Ministry of Education,School of Materials Science and Engineering,Zhejiang University,Hangzhou 310027,China [2]College of Chemical and Biological Engineering,Zhejiang University,Hangzhou 310027,China [3]Key Laboratory for Biomedical Engineering of Ministry of Education,College of Biomedical Engineering and Instrument Science,Zhejiang University,Hangzhou 310027,China [4]Wenzhou Key Laboratory of Novel Optoelectronic and Nano Materials,Institute of Wenzhou,Zhejiang University,Wenzhou 325006,China

出　　处：《Chinese Chemical Letters》2022年第8期3931-3935,共5页中国化学快报（英文版）

基　　金：financially supported by National Natural Science Foundation of China(No.U20A20209);Zhejiang Provincial Key Research and Development Program(No.2021C01030);Zhejiang Provincial Natural Science Foundation of China(No.LD19E020001);Open Project of Laboratory for Biomedical Engineering of Ministry of Education,Zhejiang University。

摘　　要：Iron fluoride(FeF_(3)) is considered as a promising cathode material for Li-ion batteries(LIBs)due to its high theoretical capacity(712 mAh/g)with a 3 e-transfer.Herein,we have designed a strategy of hierarchical and mesoporous FeF_(3)/rG O hybrids for LIBs,where the hollow Fe F_(3) nanospheres are the main contributor to the specific capacity and the 2 D r GO nanosheets are the matrix elevating the electronic conductivity and buffering the volume expansion.The unique FeF_(3)/rGO hybrid can be rationally synthesized by a nonaqueous in-situ precipitation method,offering the merits of large specific surface area with rich active sites,fast transport channels for lithium ions,effective alleviation of volume expansion during cycles,and accelerating the electrochemical reaction kinetics.The Fe F_(3)/r GO hybrid electrode possesses a high initial discharge capacity of 553.9 m Ah/g at a rate of 0.5 C with 378 m Ah/g after 100 cycles,acceptable rate capability with 168 m Ah/g at 2 C,and feasible high-temperature operation(320 m Ah/g at 70℃).The superior electrochemical behaviors presented here demonstrates that the FeF_(3)/rGO hybrid is a potential electrode for LIBs,which may open up a new vision to design high-efficiency energy-storage devices such as LIBs based on transition metal fluorides.

关 键 词：Li-ion batteries Transition metal fluorides Reduced graphite oxide Hybrid electrodes In-situ synthesis High-temperature operation 

分 类 号：TM912[电气工程—电力电子与电力传动] TB383.1[一般工业技术—材料科学与工程]