Electrochemical activation of oxygen atom of SnO2 to expedite efficient conversion reaction for alkaline-ion(Li+/Na+/K+)storages  

作　　者：Yong Cheng Bingbing Chen Limin Chang Dongyu Zhang Chunli Wang Shaohua Wang Ping Nie Limin Wang 

机构地区：[1]Key Laboratory of Preparation and Applications of Environmental Friendly Materials(Jilin Normal University),Ministry of Education,Changchun 130103,China [2]State Key Laboratory of Rare Earth Resource Utilization,Changchun Institute of Applied Chemistry,CAS,Changchun 130022,China [3]Department of Energy Science and Engineering,Nanjing Tech University,Nanjing 210000,China [4]State Key Laboratory of Metastable Materials Science and Technology,Yanshan University,Qinhuangdao 066004,China

出　　处：《Nano Research》2023年第1期1642-1650,共9页纳米研究（英文版）

基　　金：This work is financially supported by the National Key R&D Program of China(No.2017YFE0198100);the National Natural Science Foundation of China(Nos.21975250 and 52072145);Science and Technology Development Program of Jilin Province(No.YDZJ202101ZYTS185);the Open Pogram of Key Laboratory of Preparation and Application of Environmental Friendly Materials(Jilin Normal University),Ministry of Education,China(Nos.2020005 and 2021007);the Open Pogram of State Key Laboratory of Metastable Materials Science and Technology(Yanshan University),China(No.202110).

摘　　要：SnO2-based anode materials have attracted much attention due to high capacity and relatively mild voltage platforms.However,limited by low initial Coulombic efficiency(ICE)and poor stability,its practical application is still challenging.Recently,it has been found that compositing carbon or metal particles with SnO2 is an effective strategy to achieve high alkaline-ion storages.Although this strategy may improve the kinetics and ICE of the electrochemical reaction,the specific mechanism has not been clearly elucidated.In this work,we found that the invalidation SnO2 may go through two steps:1)the conversion process from SnO2 to Sn and Li2O;2)the collapse of the electrode material resulted from huge volume changes during the alloyed Sn with alkaline ions.To address these issues,a unique robust Co-NC shell derived from ZIF-67 is introduced,in which the transited metallic Co nanoparticles could accelerate the decomposition of Sn-O and Li-O bonds,thus expedite the kinetics of conversion reaction.As a result,the SnO2@Co-NC electrode achieves a more complete and efficient transfer between SnO2 and Sn phases,possessing a potential to achieve high alkaline-ion(Li+/Na+/K+)storages.

关 键 词：alkaline-ion storage SNO2 ANODE conversion reaction electron transfer 

分 类 号：O64[理学—物理化学]