The state of V in a vanadium-based cathode is considered a key factor in improving its electrochemical energy storage characteristics for zinc-ion batteries.Herein,we innovatively developed a B-doping strat egy to str...The state of V in a vanadium-based cathode is considered a key factor in improving its electrochemical energy storage characteristics for zinc-ion batteries.Herein,we innovatively developed a B-doping strat egy to strengthen the V–O bond in a vanadium oxophosphate(VOPO_(4)·2H_(2)O)cathode.B was pre inserted into the interlayer of VOPO_(4)·2H_(2)O and it bound to the oxygen atoms,forming V–O–B bonds,decreasing the positive charge distribution of V.The increased amount of V^(4+)and the interlayer separ ation of VOPO_(4)·2H_(2)O are beneficial for modified B-doped VOPO_(4)·2H_(2)O.Experimentally,the optimal B-doped VOPO_(4)·2H_(2)O delivers a high discharge capacity of 234.5 mA h g^(−1)at 0.1 A g^(−1)and a good rate performance,and the percentage of intercalated pseudocapacitance rose from 83%to 98%caused by the H^(+)/Zn^(2+)co-intercalation after B-doping.Based on the ex situ XRD characterization in the charging and discharging process,the stability of the layered structure of B-doped VOPO_(4)·2H_(2)O was verified,which enables it to act as a promising cathode for high-performance ZIBs.展开更多
基金support from the National Natural Science Foundation of China(No.21978026,22078028)Jiangsu Provincial Science and Technology Plan Project Youth Fund(No.BK20230639)+1 种基金Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology(No.BM2012110)Changzhou University College Student Innovation and Entrepreneurship Training Program(No.202210292015Y).
文摘The state of V in a vanadium-based cathode is considered a key factor in improving its electrochemical energy storage characteristics for zinc-ion batteries.Herein,we innovatively developed a B-doping strat egy to strengthen the V–O bond in a vanadium oxophosphate(VOPO_(4)·2H_(2)O)cathode.B was pre inserted into the interlayer of VOPO_(4)·2H_(2)O and it bound to the oxygen atoms,forming V–O–B bonds,decreasing the positive charge distribution of V.The increased amount of V^(4+)and the interlayer separ ation of VOPO_(4)·2H_(2)O are beneficial for modified B-doped VOPO_(4)·2H_(2)O.Experimentally,the optimal B-doped VOPO_(4)·2H_(2)O delivers a high discharge capacity of 234.5 mA h g^(−1)at 0.1 A g^(−1)and a good rate performance,and the percentage of intercalated pseudocapacitance rose from 83%to 98%caused by the H^(+)/Zn^(2+)co-intercalation after B-doping.Based on the ex situ XRD characterization in the charging and discharging process,the stability of the layered structure of B-doped VOPO_(4)·2H_(2)O was verified,which enables it to act as a promising cathode for high-performance ZIBs.
