Multiscale structural NaTi_(2)(PO_(4))_(3) anode for sodium-ion batteries with long cycle,high areal capacity,and wide operation temperature  

作　　者：Guobao Xu Liyue Yang Zhihao Yan Zhikai Huang Xue Li Gencai Guo Ye Tian Liwen Yang Jianyu Huang Yaru Liang Shulei Chou 

机构地区：[1]Hunan Provincial Key Laboratory of Thin Film Materials and Devices,School of Material Sciences and Engineering,Xiangtan University,Xiangtan,China [2]School of Physics and Optoelectronics,Xiangtan University,Xiangtan,China [3]College of Electronic Information and Electrical Engineering,Changsha University,Changsha,China [4]College of Chemistry and Chemical Engineering,Central South University,Changsha,China [5]Institute for Carbon Neutralization,College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou,China

出　　处：《Carbon Energy》2024年第10期39-50,共12页碳能源(英文)

基　　金：National Natural Science Foundation of China(12002294 and 12074327);Science and Technology Innovation Program of Hunan Province(2021RC2099);Natural Science Foundation of Hunan Province(2022JJ40435);China Postdoctoral Science Foundation(2022M722664).

摘　　要：Though plenty of research has been conducted to improve the low intrinsic electronic conductivity of NASICON-structured NaTi_(2)(PO_(4))_(3)(NTP),realizing sodium-ion batteries with high areal/volumetric capacity still remains a formidable challenge.Herein,a multiscale design from anode material to electrode structure is proposed to obtain a gadolinium-ion-doped and carbon-coated NTP composite electrode(NTP-Gd-C),in which gadolinium ion doping,oxygen vacancy,optimized structure,N-doped carbon coating,and bridging on the three-dimensional network are simultaneously achieved.In the whole electrode,the excellent hierarchical electronic/ionic conductivity and structural stability are simultaneously improved via the synergistic optimization of NTP-Gd-C.As a result,excellent electrochemical performances of NTP-Gd-C electrode with a high areal/volumetric capacity of 1.0 mAh cm^(−2)/142.8 mAh cm^(−3),high rate capability(58.3 mAh g^(−1) at 200 C),long cycle life(ultralow capacity fading of 0.004%per cycle under 10,000 cycles),and wide-temperature electrochemical performances(97.0 mAh g^(−1) at 2 C under−20℃)are achieved.Moreover,the NTP-Gd-C//Na_(3)V_(2)(PO_(4))_(3)/C full cell also delivers an excellent rate capacity of 42.0 mAh g^(−1) at 200 C and long-term high-capacity retention of 66.2%after 4000 cycles at 20 C.

关 键 词：high areal/volumetriccapacity multiscalestructure NaTi_(2)(PO_(4))_(3) Na+storage mechanism sodiumion batteries 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ131.12[化学工程—无机化工]