The alkaline zinc-based batteries with high energy density are becoming a research hotspot.However,the poor cycle stability and low-rate performance limit their wide application.Herein,ultra-thin CoNiO2 nanosheet with...The alkaline zinc-based batteries with high energy density are becoming a research hotspot.However,the poor cycle stability and low-rate performance limit their wide application.Herein,ultra-thin CoNiO2 nanosheet with rich oxygen defects anchored on the vertically arranged Ni nanotube arrays(Od-CNO@Ni NTs)is used as a positive material for rechargeable alkaline Ni–Zn batteries.As the highly uniform Ni nanotube arrays provide a fast electron/ion transport path and abundant active sites,the Od-CNO@Ni NTs electrode delivers excellent capacity(432.7 mAh g^(−1))and rate capability(218.3 mAh g^(−1) at 60 A g^(−1)).Moreover,our Od-CNO@Ni NTs//Zn battery is capable of an ultra-long lifespan(93.0%of initial capacity after 5000 cycles),extremely high energy density of 547.5 Wh kg^(−1) and power density of 92.9 kW kg^(−1)(based on the mass of cathode active substance).Meanwhile,the theoretical calculations reveal that the oxygen defects can enhance the interaction between electrode surface and electrolyte ions,contributing to higher capacity.This work opens a reasonable idea for the development of ultra-durable,ultra-fast,and high-energy Ni–Zn battery.展开更多
Nickel–cobalt oxide is considered as a promising anode for lithium-ion battery,owing to its high specifc capacity,simple synthesis process and high safety.However,like most transition metal oxide anode materials,nic...Nickel–cobalt oxide is considered as a promising anode for lithium-ion battery,owing to its high specifc capacity,simple synthesis process and high safety.However,like most transition metal oxide anode materials,nickel–cobalt oxide sufers from poor conductivity,easy agglomeration and large volume expansion in the charging and discharging process,causing an inferior cycling lifespan.Here we report a structure design that CoNiO2 particles are ingeniously interlaced on carbon nanotubes by a simple solvothermal method.These nanotubes are irregularly intertwined to obtain an independent electrode structure with high electronic conductivity,which can also alleviate the notorious volume expansion.Consequently,the corresponding lithium-ion battery shows superior electrochemical performance.It provides a discharge capacity of 1213.7 mAh g^(−1) at 0.5 A g^(−1),and can be stable over 100 cycles with a capacity retention of 96.45%.Furthermore,the battery can also deliver a reversible capacity of 544.8 mAh g^(−1) at the high current density 3 A g^(−1).This work provides a unique idea for the performance improvement of nickel–cobalt oxide anode for lithium-ion batteries.展开更多
基金This work was supported by the National Natural Science Foundation of China(No.52002122)the Science and Technology Department of Hubei Province(No.2019AAA038)+1 种基金the Project funded by China Postdoctoral Science Foundation(No.2021M690947)the Wuhan Yellow Crane Talent Program(No.2017-02).
文摘The alkaline zinc-based batteries with high energy density are becoming a research hotspot.However,the poor cycle stability and low-rate performance limit their wide application.Herein,ultra-thin CoNiO2 nanosheet with rich oxygen defects anchored on the vertically arranged Ni nanotube arrays(Od-CNO@Ni NTs)is used as a positive material for rechargeable alkaline Ni–Zn batteries.As the highly uniform Ni nanotube arrays provide a fast electron/ion transport path and abundant active sites,the Od-CNO@Ni NTs electrode delivers excellent capacity(432.7 mAh g^(−1))and rate capability(218.3 mAh g^(−1) at 60 A g^(−1)).Moreover,our Od-CNO@Ni NTs//Zn battery is capable of an ultra-long lifespan(93.0%of initial capacity after 5000 cycles),extremely high energy density of 547.5 Wh kg^(−1) and power density of 92.9 kW kg^(−1)(based on the mass of cathode active substance).Meanwhile,the theoretical calculations reveal that the oxygen defects can enhance the interaction between electrode surface and electrolyte ions,contributing to higher capacity.This work opens a reasonable idea for the development of ultra-durable,ultra-fast,and high-energy Ni–Zn battery.
基金supported by the National Natural Science Foundation of China(No.U1960107)the“333”Talent Project of Hebei Province(No.A202005018)+2 种基金the Fundamental Research Funds for the Central Universities(No.N2123001)the S&T Program of Hebei(No.22567627H)the Science and Technology Research Youth Fund Project of Higher Education Institutions of Hebei Province(No.QN2022196).
文摘Nickel–cobalt oxide is considered as a promising anode for lithium-ion battery,owing to its high specifc capacity,simple synthesis process and high safety.However,like most transition metal oxide anode materials,nickel–cobalt oxide sufers from poor conductivity,easy agglomeration and large volume expansion in the charging and discharging process,causing an inferior cycling lifespan.Here we report a structure design that CoNiO2 particles are ingeniously interlaced on carbon nanotubes by a simple solvothermal method.These nanotubes are irregularly intertwined to obtain an independent electrode structure with high electronic conductivity,which can also alleviate the notorious volume expansion.Consequently,the corresponding lithium-ion battery shows superior electrochemical performance.It provides a discharge capacity of 1213.7 mAh g^(−1) at 0.5 A g^(−1),and can be stable over 100 cycles with a capacity retention of 96.45%.Furthermore,the battery can also deliver a reversible capacity of 544.8 mAh g^(−1) at the high current density 3 A g^(−1).This work provides a unique idea for the performance improvement of nickel–cobalt oxide anode for lithium-ion batteries.
