文献类型：期刊文献

英文题名：Optimizing SnO2-x/Fe2O3 Hetero-Nanocrystals Toward Rapid and Highly Reversible Lithium Storage

作者：Hu, Chen[1];Chen, Ling[2];Hu, Yanjie[1];Chen, Aiping[1];Chen, Long[2];Jiang, Hao[1,2];Li, Chunzhong[1,2]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn, Key Lab Ultrafine Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem Engn, Shanghai Engn Res Ctr Hierarch Nanomat, Shanghai 200237, Peoples R China

年份：2021

卷号：17

期号：49

外文期刊名：SMALL

收录：;EI(收录号：20214311058219);WOS:【SCI-EXPANDED(收录号:WOS:000709880400001)】；

基金：This work was supported by the National Natural Science Foundation of China (21975074, 21838003, and 91834301), the Shanghai Scientific and Technological Innovation Project (18JC1410500), and the Fundamental Research Funds for the Central Universities (222201718002).

语种：英文

外文关键词：fast charging; heterogeneous nanoparticles; lithium-ion batteries; spray combustion; tin oxides

摘要：Engineering oxygen vacancy and boosting Li2O reversibility on oxides-based electrode are of significance but remains a challenge in high-power lithium-ion batteries. Herein, the heterogenous SnO2-x/Fe2O3-y nanocrystals are demonstrated with tailorable x and y values enabled by a glucose-assisted spray combustion technique. Density functional theory calculations unveil the SnO2-x/Fe2O3 with a maximum x value has the optimal electronic structure, the metallic Fe generated from Fe2O3 can markedly reduce the free energy to break Li-O bonds for accelerating subsequent delithiation process of Li2O. Consequently, the optimized SnO2-x/Fe2O3 exhibits a remarkably enhanced electrochemical reversibility and reaction kinetics. After stabilized by reduced graphene oxide, the hybrid delivers a high reversible specific capacity of 1113 mAh g(-1) with superior rate performance (474 mAh g(-1) at 20 A g(-1)) and long cycle life (negligible loss after 500 cycles at 5 A g(-1)), the oxygen vacancy and microstructure are well-maintained after cycles. This work provides the possibilities for skillfully regulating oxygen vacancy and meantime enhancing Li2O reversibility.