Alleviating mechanical degradation of hexacyanoferrate via strain locking during Na^(+) insertion/extraction for full sodium ion battery  

作　　者：Jianguo Sun Hualin Ye Jin An Sam Oh Yao Sun Anna Plewa Yumei Wang Tian Wu Kaiyang Zeng Li Lu 

机构地区：[1]Department of Mechanical Engineering,National University of Singapore,Singapore 117575,Singapore [2]National University of Singapore Chongqing Research Institute,Chongqing 401123,China [3]Department of Chemical&Biomolecular Engineering,National University of Singapore,Singapore 117585,Singapore [4]Integrative Sciences and Engineering Programme,NUS Graduate School,National University of Singapore,Singapore 138632,Singapore [5]Singapore Institute of Manufacturing Technology,A*STAR(Agency for Science,Technology,and Research),Singapore 138634,Singapore [6]School of Science,Harbin Institute of Technology,Shenzhen 518055,China [7]Faculty of Energy and Fuels AGH University of Science and Technology al.Mickiewicza 30,30-059 Krakow,Poland [8]Institute of Materials Research and Engi

出　　处：《Nano Research》2022年第3期2123-2129,共7页纳米研究（英文版）

基　　金：J.G.S.wants to thanks China Scholarship Council(CSC)for the scholarship support(No.201706050153)。

摘　　要：Generation of large strains upon Na^(+) intercalation is one of the prime concerns of the mechanical degradation of Prussian blue(PB)and its analogs.Structural construction from the atomic level is imperative to maintain structural stability and ameliorate the long-term stability of PB.Herein,an inter nickel hexacyanoferrate(NNiFCN)is successfully introduced at the out layer of iron hexacyanoferrate(NFFCN)through ion exchange to improve structural stability through compressive stress locking by forming NNiFCN shell.Furthermore,the kinetics of sodium ion diffusion is enhanced through the built-in electric pathway.The electrochemical performance is therefore significantly improved with a remarkable long-term cycling stability over 3,000 cycles at 500 mA·g^(–1) in the full sodium-ion batteries(SIBs)with a maximum energy density of 91.94 Wh·g^(–1),indicating that the core-shell structured NNiFCN/NFFCN could be the low-cost and high-performance cathode for full SIBs in large-scale EES applications.

关 键 词：mechanical degradation core-shell structure Prussian blue full sodium-ion battery built-in electric field 

分 类 号：TM912[电气工程—电力电子与电力传动]