The development of zinc ion batteries(ZIBs)with large capacity,high rate,and durable cathode material is a crucial and urgent task.NiCo2O4(NCO)has received ever-growing interest as a potential cathode material for ZIBs,owing to the high theoretical capacity,rich source,cost-effective,and versatile redox nature.However,due to the slow dynamics of the NCO electrodes,its practical application in high-performance systems is severely limited.Herein,we report an electron density modulated NCO nanosheets(N-NCO NSs)with high-kinetics Zn2+-storage capability as an additive-free cathode for flex-ible all-solid-state(ASS)ZIBs.By virtue of the enhanced electronic conductivity,improved reaction kinet-ics,and increased active sites,the optimized N-NCO NSs electrode delivers a high capacity of 357.7 mAh g-1 at 1.0 A g-1 and a superior rate capacity of 201.4 mAh g-1 at 20 Ag-1.More importantly,a flexible ASS ZIBs device is manufactured using a solid polymer electrolyte of a poly(vinylidene fluoride hexafluoro-propylene)(PVDF-HFP)film.The flexible ASS ZIBs device shows superb durability with 80.2％capacity retention after 20,000 cycles and works well in the range of-20-70℃.Furthermore,the flexible ASS ZIBs achieves an impressive energy density as high as 578.1 W h kg-1 with a peak power density of 33.6 kW kg-1,substantially outperforming those latest ZIBs.This work could provide valuable insights for constructing high-kinetics and high-capability cathodes with long-term stability for flexible ASS ZIBs.

Wenda Qiu;Yunlei Tian;Zhenchao Lin;Shuting Lin;Zhangqi Geng;Kaitao Huang;Aihua Lei;Fuchun Huang;Huajie Feng;Fengze Ding;Yu Li;Xihong Lu

Guangdong Industry Polytechnic College,Guangzhou 510300,Guangdong,China;MOE of the Key Laboratory of Bioinorganic and Synthetic Chemistry,KLGHEI of Environment and Energy Chemistry,School of Chemistry,Sun Yat-Sen University,Guangzhou 510275,Guangdong,China;Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province,Hainan Normal University,Haikou 571158,Hainan,China

能源化学

[1]Wenda Qiu;Yunlei Tian;Zhenchao Lin;Shuting Lin;Zhangqi Geng;Kaitao Huang;Aihua Lei;Fuchun Huang;Huajie Feng;Fengze Ding;Yu Li;Xihong Lu-.High rate and ultralong life flexible all-solid-state zinc ion battery based on electron density modulated NiCo2O4 nanosheets)[J].能源化学,2022(07):283-291

hexafluoro

High,rate,ultralong,life,flexible,solid,state,zinc,battery,density,modulated,NiCo2O4,nanosheets,development,batteries,ZIBs,large,capacity,high,durable,material,crucial,urgent,task,NCO,has,received,growing,interest,potential,theoretical,rich,source,cost,effective,versatile,redox,nature,However,due,slow,dynamics,electrodes,its,practical,application,performance,systems,severely,limited,Herein,report,NSs,kinetics,Zn2+,storage,capability,additive,free,ASS,By,virtue,enhanced,electronic,conductivity,improved,reaction,increased,active,sites,optimized,delivers,mAh,superior,Ag,More,importantly,device,manufactured,using,polymer,electrolyte,vinylidene,fluoride,propylene,PVDF,HFP,film,shows,superb,durability,retention,after,cycles,works,well,range,Furthermore,achieves,impressive,energy,peak,power,kW,substantially,outperforming,those,latest,This,could,provide,valuable,insights,constructing,cathodes,term,stability

0.5342