Manipulation of Na_(3)V_(2)(PO_(4))_(2)F_(3) via aluminum doping to alter local electron states toward an advanced cathode for sodiumion batteries  

作　　者：Shi-Min Wang Jin-Qi Li Li Xu Meng-Jiao Sun Wen-Jin Huang Qing Liu Fu-Tong Ren Yong-Jiang Sun Ling-Yan Duan Hang Ma Hong Guo 

机构地区：[1]International Joint Research Center for Advanced Energy Materials of Yunnan Province,Yunnan Key Laboratory of Carbon Neutrality and Green Low-Carbon Technologies,School of Materials and Energy,Yunnan University,Kunming 650091,China [2]College of Environmental and Chemical Engineering,Metallurgy College,Kunming 650033,China [3]R&D Center,Yunnan Yuntianhua Co.,Ltd,Kunming 650228,China [4]Southwest United Graduate School,Kunming 650091,China

出　　处：《Rare Metals》2024年第9期4253-4262,共10页稀有金属（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52064049 and52372232);the Major Science and Technology Projects of Yunnan Province(No.202302AB080019-3);the National Natural Science Foundation of Yunnan Province(Nos.202301AS070040 and202301AU070209);the Scientific Research Fund Project of Yunnan Provincial Department of Education(No.2023J0033)。

摘　　要：With its unique 3D skeleton structure and exceptional cyclic stability,the Na^(+)superionic conducto(NASICON)-type Na_(3)V_(2)(PO_(4))_(2)F_(3)(NVPF)has been con sidered as a competitive cathode material for advanced Na ion batteries.However,the release of fluorine during th heat treatment leads to the formation of an additional phas Na_(3)V_(2)(PO_(4))_(3)(NVP),which results in a low-voltage plateau and compromises the energy density.Herein,we modulat the local electronic states of the V site by aluminum sub stitution to strengthen the stability of F.The results confirm that the aluminum introduction not only changes the loca electron states of V sites,significantly reducing the for mation of NVP by-product from 6.71 wt%to 1.01 wt%but also effectively reduces the band gap,improving th electronic conductivity of NVPF.The optimized Na_(3)V_(1.9)Al_(0.1)(PO_(4))_(2)F_(3)exhibits higher energy density of 340 Wh·kg^(-1)and excellent rate performance of 106.7 mAh·g^(-1)at 10C compared with the pristine cathode.

关 键 词：Sodium-ion energy storage batteries CATHODE NASICON Doping ELECTROCHEMISTRY 

分 类 号：TM912[电气工程—电力电子与电力传动]