Multi-layered fluorinated graphene cathode materials for lithium and sodium primary batteries  

作　　者：Yan-Yan Li Chao Liu Lei Chen Xiao-Zhong Wu Peng-Fei Zhou Xiang-Yan Shen Jin Zhou 

机构地区：[1]School of Chemistry and Chemical Engineering,Shandong University of Technology,Zibo 255000,China

出　　处：《Rare Metals》2023年第3期940-953,共14页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(No.22078179);Taishan Scholar Foundation(No.tsqn201812063)。

摘　　要：Fluorinated graphene has a promising application prospect in lithium primary batteries(LPBs)and sodium primary batteries(SPBs).Herein,five fluorinated graphene materials with different fluorine contents(FG-x)are prepared by a large-scale gas fluorination process.It is found that the structural characteristics of FG-x strongly depend on the fluorination temperature:the fluorine content(i.e.,F/C ratio)gradually increases with the fluorination temperature rising,resulting in the enlargement of interlayer spacing and the increase of average bonding strength between C and F.FG-0.75 sample with the intermediate degree of fluorination achieves the maximum energy densities in LPBs(2239.8 Wh·kg^(-1))and SPBs(1939.2 Wh·kg^(-1)).The interlayer distance is critical to the rate capability of FG-x,and FG-0.95 with the largest lattice spacing exhibits the best rate performance in both Li/CFx and Na/CFx batteries.The electrochemical reaction mechanism and the structural evolution of FG material revealed by ex situ X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD)characterization,and in situ Raman spectra further confirm the effect of interlayer distance.

关 键 词：Lithium batteries Sodium batteries FLUOROCARBON Fluorinated graphene 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ127.11[化学工程—无机化工]