Ti,F Codoped Sodium Manganate of Layered P2-Na_(0.7)MnO_(2.05)Cathode for High Capacity and Long-Life Sodium-Ion Battery  

作　　者：Pengchao Wen Haodong Shi Dandan Guo Aimin Wang Yan Yu Zhong-Shuai Wu 

机构地区：[1]State Key Laboratory of Catalysis,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023 [2]Department of Material and Chemical Engineering,Yulin University,Yulin 719000 [3]Hefei National Laboratory for Physical Sciences at the Microscale,Department of Materials Science and Engineering,CAS Key Laboratory of Materials for Energy Conversion,University of Science and Technology of China,Hefei,Anhui 230026 [4]Dalian National Laboratory for Clean Energy,Chinese Academy of Sciences,Dalian 116023

出　　处：《Renewables》2023年第1期81-89,共9页可再生能源（英文）

基　　金：the National Natural Science Foundation of China(grant nos.22125903 and 51872283);the Dalian Innovation Support Plan for High Level Talents(grant no.2019RT09);the Joint Fund of the Yulin University and the Dalian National Laboratory for Clean Energy(YLU-DNL Fund 2021002);the Dalian National Laboratory for Clean Energy(DNL);the CAS-DNL Cooperation Fund,CAS(grant nos.DNL201912,DNL201915,DNL202016,and DNL202019),and DICP(grant no.DICP I2020032).

摘　　要：The development of layered sodium manganese oxide cathode materials with high capacity and structural stability is one of the keys to boosting the performance of sodium-ion batteries(SIBs),but it remains a great challenge.Herein,a titanium and fluorine codoped P2 type sodiummanganate of Na_(0.7)MnO_(2.05)cathode material(NMO-0.1TF)is developed as a high-capacity and long-durable cathode for highperformance SIBs.Titanium and fluorine codoping significantly reduces the structural deformation,synergistically improves structural stabilization,inhibits the formation of irreversible phases,and enhances electrochemical kinetics.As a result,the NMO-0.1TF||Na battery working in the voltage ranges of 2.0-4.2 V exhibits a high specific capacity of 227 mAh g^(−1)at a current density of 20 mA g^(−1)and an excellent rate performance(76 mAh g^(−1)at a high current density of 3 A g^(−1)).Such a battery still delivers an outstanding cycle stability,shows a high initial discharge capacity of 133 mAh g^(−1)at 1 A g^(−1),and maintains the initial capacity of 96.2%after 200 cycles.More importantly,the assembled full battery of NMO-0.1TF||hard carbon validates high capacity and impressive cyclability.Therefore,this codoped NMO-0.1TF cathode with high capacity and excellent stability represents a brilliantly practical application for developing high energy density SIBs.

关 键 词：sodium-ion battery sodium manganese cathode material ion doping high energy density cycling stability 

分 类 号：TM912[电气工程—电力电子与电力传动]