Superior lithium storage performance in MoO_(3) by synergistic effects:Oxygen vacancies and nanostructures  

作　　者：Xueyang Hou Miao Ruan Lijiao Zhou Jianchun Wu Bicheng Meng Wenlong Huang Kenan Zhong Kai Yang Zhao Fang Keyu Xie 

机构地区：[1]School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,Shaanxi,China [2]State Key Laboratory of Solidification Processing,Center for Nano Energy Materials,School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,Shaanxi,China [3]School of Nuclear Science and Technology,Sichuan University,Chengdu 610064,Sichuan,China

出　　处：《Journal of Energy Chemistry》2023年第3期91-101,I0003,共12页能源化学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Key Program: 52034011,51974219;General Program: 51974219)。

摘　　要：Molybdenum trioxide(MoO_(3))has recently attracted wide attention as a typical conversion-type anode of Li-ion batteries(LIBs).Nevertheless,the inferior intrinsic conductivity and rapid capacity fading during charge/discharge process seriously limit large-scale commercial application of MoO_(3).Herein,the density function theory(DFT)calculations show that electron-proton co-doping preferentially bonds symmetric oxygen to form unstable HxMoO_(3).When the-OH-group in HxMoO_(3) is released into the solution in the form of H_(2)O,it is going to form MoO_(3-x)with lower binding energy.By the means of both electron-proton co-doping and high-energy nanosizing,oxygen vacancies and nanoflower structure are introduced into MoO_(3) to accelerate the ion and electronic diffusion/transport kinetics.Benefitting from the promotion of ion diffusion kinetics related to nanostructures,as well as both the augmentation of active sites and the improvement of electrical conductivity induced by oxygen vacancies,the MoO_(3-x)/nanoflower structures show excellent lithium-ion storage performance.The prepared specimen has a high lithium-ion storage capacity of 1261 mA h g^(-1)at 0.1 A g^(-1)and cyclic stability(450 cycle),remarkably higher than those of previously reported MoO_(3)-based anode materials.

关 键 词：2D materials MoO_(3-x) Electron proton co-doping Lithium-ion anode Molybdenum oxide ore 

分 类 号：TM912[电气工程—电力电子与电力传动] TQ136.12[化学工程—无机化工]