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Polyanions Enhance Conversion Reactions for Lithium/Sodium‐Ion Batteries: The Case of SbVO 4 Nanoparticles on Reduced Graphene Oxide
Author(s) -
Pan Jun,
Zhang Yuchen,
Li Lili,
Cheng Zhenjie,
Li Yanlu,
Yang Xianfeng,
Yang Jian,
Qian Yitai
Publication year - 2019
Publication title -
small methods
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.66
H-Index - 46
ISSN - 2366-9608
DOI - 10.1002/smtd.201900231
Subject(s) - anode , materials science , graphene , electrochemistry , lithium (medication) , oxide , chemical engineering , redox , alloy , composite number , nanoparticle , ion , electrode , sodium , nanotechnology , inorganic chemistry , metallurgy , composite material , chemistry , medicine , organic chemistry , endocrinology , engineering
Anode materials based on redox alloying/dealloying reactions are regarded as one of the promising electrodes in Li/Na‐ion batteries. However, the enormous volume change upon cycling induces the giant structure strain, particle pulverization and then capacity decay. Here, vanadates are proposed to mitigate this concern for alloy‐type anode materials, using SbVO 4 as an example. As indicated by density function theory and in situ/ex situ techniques, VO 4 3− enhances the conversion reaction between Sb 3+ and Sb, buffers the structure change induced by alloying/dealloying reactions of Sb and exhibits the electrochemical activity to Li ions. These results make SbVO 4 superior to Sb, Sb 2 O 3 and SbPO 4 in the electrochemical performances, which applies both to lithium‐ion batteries and to sodium‐ion batteries. Then, the structure design and carbon composite are achieved by depositing monodispersed SbVO 4 nanocrystals on reduced graphene oxides via a simple solvothermal reaction. This composite shows a good cycling stability and a high rate capability, especially in sodium‐ion batteries (73.6% after 1500 cycles at 1 A g −1 , or 252 mAh g −1 at 10 A g −1 ). These results open the door for other alloy‐type anode materials to improve the performances.