High Fe^(LS)(C)electrochemical activity of an iron hexacyanoferrate cathode boosts superior sodium ion storage  

作　　者：Junhong Guo Fan Feng Shiqiang Zhao Zhenhai Shi Rui Wang Meng Yang Fangfang Chen Suli Chen Zi-Feng Ma Tianxi Liu 

机构地区：[1]Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,International Joint Research Laboratory for Nano Energy Composites,School of Chemical and Material Engineering,Jiangnan University,Wuxi,China [2]Department of Chemical Engineering,Shanghai Electrochemical Energy Devices Research Center,Shanghai Jiao Tong University,Shanghai,China [3]College of Chemistry and Materials Engineering,Wenzhou University,Wenzhou,China

出　　处：《Carbon Energy》2023年第5期67-77,共11页碳能源（英文）

基　　金：supported by the Natural Science Foundation of Jiangsu Province (No.BK20210474);the National Natural Science Foundation of China (No.21938005);the Fundamental Research Funds for the Central Universities (No.JUSRP122013).

摘　　要：Sodium iron hexacyanoferrate(FeHCF)is one of the most promising cathode materials for sodium-ion batteries(SIBs)due to its low cost theoretical capacity.However,the low electrochemical activity of Fe^(LS)(C)in FeHCF drags down its practical capacity and potential plateau.Herein,FeHCF with high Fe^(LS)(C)electrochemical activity(C-FeHCF)is synthesized via a facile citric acid-assisted solvothermal method.As the cathode of SIBs,C-FeHCF shows superior cycling stability(ca.87.3%capacity retention for 1000 cycles at 10 C)and outstanding rate performance(ca.68.5%capacity retention at 50 C).Importantly,the contribution of Fe^(LS)(C)to the whole capacity was quantitatively analyzed via combining dQ/dV and discharge curve for the first time,and the index reaches 44.53%for C-FeHCF,close to the theoretical value.In-situ X-ray diffraction proves the structure stability of C-FeHCF during charge-discharge process,ensuring its superior cycling performance.Furthermore,the application feasibility of the C-FeHCF cathode in quasi-solid SIBs is also evaluated.The quasi-solid SIBs with the C-FeHCF cathode exhibit excellent electrochemical performance,delivering an initial discharge capacity of 106.5 mAh g^(−1) at 5 C and high capacity retention of 89.8%over 1200 cycles.This work opens new insights into the design and development of advanced cathode materials for SIBs and the beyond.

关 键 词：cathode material electrochemical activity sodium-ion batteries sodium iron hexacyanoferrate structural evolution 

分 类 号：TM912[电气工程—电力电子与电力传动]