文献类型：期刊文献

英文题名：Robust alpha-Fe2O3@TiO2 Core-Shell Structures With Tunable Buffer Chambers for High-Performance Lithium Storage

作者：Pian, Chunyuan[1];Peng, Weichao[2];Ren, Haoyu[3];Ma, Chao[4];Su, Yun[1];Ti, Ruixia[1];Chen, Xiuyu[1];Zhu, Lixia[1];Liu, Jingjing[1];Sun, Xinzhi[1];Wang, Bin[1];Niu, Bingxuan[5];Wu, Dapeng[3,6]

通讯作者：Wang, B[1];Wu, DP[2];Niu, BX[3];Wu, DP[4]

机构：[1]Xinxiang Univ, Sch Phys & Elect Engn, Xinxiang, Peoples R China;[2]Chinese Acad Sci, Inst High Energy Phys, Key Lab Biomed Effects Nanomat & Nanosafety, Beijing, Peoples R China;[3]Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine C, Sch Chem & Chem Engn, Key Lab Green Chem Media & React,Minist Educ, Xinxiang, Peoples R China;[4]Xinxiang Univ, Sch Mech & Elect Engn, Xinxiang, Peoples R China;[5]Xinxiang Med Univ, Coll Biomed Engn, Collage Pharm, Xinxiang, Peoples R China;[6]Henan Normal Univ, Sch Environm, Xinxiang, Peoples R China

第一机构：新乡学院

通讯机构：[1]corresponding author), Xinxiang Univ, Sch Phys & Elect Engn, Xinxiang, Peoples R China;[2]corresponding author), Henan Normal Univ, Collaborat Innovat Ctr Henan Prov Green Mfg Fine C, Sch Chem & Chem Engn, Key Lab Green Chem Media & React,Minist Educ, Xinxiang, Peoples R China;[3]corresponding author), Xinxiang Med Univ, Coll Biomed Engn, Collage Pharm, Xinxiang, Peoples R China;[4]corresponding author), Henan Normal Univ, Sch Environm, Xinxiang, Peoples R China.|[11071]新乡学院;

年份：2022

卷号：10

外文期刊名：FRONTIERS IN CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000791937900001)】；

基金：Funding This work was financially supported by the National Nature Science Foundation of China (No. U1904198), the Science and Technology Department of Henan Province (No. 202102210001), the Natural Science Foundation of Henan Province (No. 202300410015), the Key Scientific Research Project of Higher Education of Henan Province (No. 20B140012), and the Ninth Group of Key Disciplines in Henan Province (No. 2018119).

语种：英文

外文关键词：

alpha-Fe2O3@TiO2

摘要：alpha-Fe2O3 has high potential energy storage capacity and can serve as a green and low-cost anode material for lithium-ion batteries. However, alpha-Fe2O3 suffers large volume expansion and pulverization. Based on DFT calculations, TiO2 can effectively maintain the integrity of the crystal structure during the discharge/charge process. Well-defined cubic alpha-Fe2O3 is coated with a TiO2 layer using the hydrothermal method with the assistance of oxalic acid surface treatment, and then alpha-Fe2O3@TiO2 with tunable buffer chambers is obtained by altering the hydrochloric acid etching time. With the joint efforts of the buffer chamber and the robust structure of the TiO2 layer, alpha-Fe2O3@TiO2 alleviates the expansion of alpha-Fe2O3 during the discharge/charge process. The optimized sample (FT-1h) achieves good cycling performance. The reversible specific capacity remains at 893.7 mA h g(-1), and the Coulombic efficiency still reaches up to 98.47% after 150 cycles at a current density of 100 mA g(-1). Furthermore, the reversible specific capacity can return to 555.5 mA h g(-1) at 100 mA g(-1) after cycling at a high current density. Hence, the buffer chamber and the robust TiO2 layer can effectively improve the cycling stability and rate performance of alpha-Fe2O3.