We report high-performance aqueous Zn-ion batteries consisting of a zinc anode,a poly(benzoquinonyl sulfide)(PBQS)cathode,and a 3 M Zn(CF_(3)SO_(3))_(2)aqueous electrolyte.The PBQS cathode displays an initial discharg...We report high-performance aqueous Zn-ion batteries consisting of a zinc anode,a poly(benzoquinonyl sulfide)(PBQS)cathode,and a 3 M Zn(CF_(3)SO_(3))_(2)aqueous electrolyte.The PBQS cathode displays an initial discharge capacity of 203 mA h g^(−1)at 0.1C and a good capacity retention of 86%after 50 cycles at 0.2C.The PBQS cathode can deliver a high reversible capacity of 126 mA h g^(−1)at a high rate of 5.0C.Meanwhile,we also studied the redox mechanism during discharge/charge processes by ex situ infrared spectra and theoretical calculations,revealing that reversible bonding of Zn^(2+)ions with carbonyl oxygen atoms in PBQS occurs in the redox reactions of PBQS molecules.The redox reactions of PBQS molecules can be regarded as the reversible bonding of Zn^(2+)ions with carbonyl oxygen atoms in PBQS.展开更多
基金supported by the Projects of MOST(2017YFA0206700)the NSFC(21673243)+1 种基金the MOE 111(B12015)Tianjin Key(no.16PTSYJC00030).
文摘We report high-performance aqueous Zn-ion batteries consisting of a zinc anode,a poly(benzoquinonyl sulfide)(PBQS)cathode,and a 3 M Zn(CF_(3)SO_(3))_(2)aqueous electrolyte.The PBQS cathode displays an initial discharge capacity of 203 mA h g^(−1)at 0.1C and a good capacity retention of 86%after 50 cycles at 0.2C.The PBQS cathode can deliver a high reversible capacity of 126 mA h g^(−1)at a high rate of 5.0C.Meanwhile,we also studied the redox mechanism during discharge/charge processes by ex situ infrared spectra and theoretical calculations,revealing that reversible bonding of Zn^(2+)ions with carbonyl oxygen atoms in PBQS occurs in the redox reactions of PBQS molecules.The redox reactions of PBQS molecules can be regarded as the reversible bonding of Zn^(2+)ions with carbonyl oxygen atoms in PBQS.
