Aqueous Zn//MnO2 batteries are emerging as promising large-scale energy storage devices owing to their cost-effectiveness,high safety,high output voltage,and energy density.However,the MnO2 cathode suffers from intrin...Aqueous Zn//MnO2 batteries are emerging as promising large-scale energy storage devices owing to their cost-effectiveness,high safety,high output voltage,and energy density.However,the MnO2 cathode suffers from intrinsically poor rate performance and rapid capacity deterioration.Here,we remove the roadblock by compositing MnO2 nanorods with highly conductive graphene,which remarkably enhances the electrochemical properties of the MnO2 cathode.Benefiting from the boosted electric conductivity and ion diffusion rate as well as the structural protection of graphene,the Zn//MnO2-graphene battery presents an admirable capacity of 301 mAh g^-1 at 0.5 A g^-1,corresponding to a high energy density of 411.6 Wh kg^-1.Even at a high current density of 10 A g^-1,a decent capacity of 95.8 mAh g^-1 is still obtained,manifesting its excellent rate property.Furthermore,an impressive power density of 15 kW kg^-1 is achieved by the Zn//MnO2-graphene battery.展开更多
Rechargeable aqueous zinc-ion batteries(AZIBs)have their unique advantages of cost efficiency,high safety,and environmental friendliness.However,challenges facing the cathode materials include whether they can remain ...Rechargeable aqueous zinc-ion batteries(AZIBs)have their unique advantages of cost efficiency,high safety,and environmental friendliness.However,challenges facing the cathode materials include whether they can remain chemically stable in aqueous electrolyte and provide a robust structure for the storage of Zn2+.Here,we report on H11Al2V6O23.2@graphene(HAVO@G)with exceptionally large layer spacing of(001)plane(13.36?).The graphene-wrapped structure can keep the structure stable during discharge/charge process,thereby promoting the inhibition of the dissolution of elements in the aqueous electrolyte.While used as cathode for AZIBs,HAVO@G electrode delivers ideal rate performance(reversible capacity of 305.4,276.6,230.0,201.7,180.6 mAh g?1 at current densities between 1 and 10 A g?1).Remarkably,the electrode exhibits excellent and stable cycling stability even at a high loading mass of^15.7 mg cm?2,with an ideal reversible capacity of 131.7 mAh g?1 after 400 cycles at 2 A g?1.展开更多
Due to the intrinsic advantages of nontoxicity, low-cost, and abundant resource of metallic zinc, aqueous zinc-ion batteries (ZIBs) have attracted universal interest [1,2]. Tremendous cathode materials have been explo...Due to the intrinsic advantages of nontoxicity, low-cost, and abundant resource of metallic zinc, aqueous zinc-ion batteries (ZIBs) have attracted universal interest [1,2]. Tremendous cathode materials have been exploited in aqueous ZIBs, such as manganese-based materials [3-11], Co-based materials [12,13] and vanadium-based materials [14-21].展开更多
镍钴氢氧化物由于理论比容量高、经济效益良好、来源广泛等优点,被广泛应用于镍锌电池中作为电极材料。本工作采用共沉淀法,调控具有不同镍钴比例的硝酸盐溶液,在室温环境下一步合成镍钴双金属氢氧化物,并将其制备成镍锌电池正极材料。...镍钴氢氧化物由于理论比容量高、经济效益良好、来源广泛等优点,被广泛应用于镍锌电池中作为电极材料。本工作采用共沉淀法,调控具有不同镍钴比例的硝酸盐溶液,在室温环境下一步合成镍钴双金属氢氧化物,并将其制备成镍锌电池正极材料。采用X射线衍射仪(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)等对所合成的样品进行表征,观察其微观形貌结构,采用电化学工作站等研究其作为镍锌电池电极材料的电化学性能。研究发现,采用高浓度Na OH溶液作为电解液,比其他通过共沉淀法所制备的镍钴氢氧化物在镍锌电池中所表现出的容量更高。结果表明,当镍钴投料比为4∶1时,样品具有最为出色的容量表现,其中,Ni_(4)Co_(1)-LDH样品在电流密度为0.5 A/g时容量可以达到327.9 m Ah/g。将其作为正极材料、锌箔作为负极,与高浓度的Na OH溶液一起组装成镍锌电池进行电化学测试,在0.5 A/g电流密度下具有230.7 m Ah/g的容量,该研究兼具材料合成快速和性能表现良好等优点,研究结果有望为镍锌电池性能优化提供新思路。展开更多
基金financially supported by the Guangdong Power Grid Co.,Ltd.(Grant No.GDKJXM20160000)。
文摘Aqueous Zn//MnO2 batteries are emerging as promising large-scale energy storage devices owing to their cost-effectiveness,high safety,high output voltage,and energy density.However,the MnO2 cathode suffers from intrinsically poor rate performance and rapid capacity deterioration.Here,we remove the roadblock by compositing MnO2 nanorods with highly conductive graphene,which remarkably enhances the electrochemical properties of the MnO2 cathode.Benefiting from the boosted electric conductivity and ion diffusion rate as well as the structural protection of graphene,the Zn//MnO2-graphene battery presents an admirable capacity of 301 mAh g^-1 at 0.5 A g^-1,corresponding to a high energy density of 411.6 Wh kg^-1.Even at a high current density of 10 A g^-1,a decent capacity of 95.8 mAh g^-1 is still obtained,manifesting its excellent rate property.Furthermore,an impressive power density of 15 kW kg^-1 is achieved by the Zn//MnO2-graphene battery.
基金supported by National Natural Science Foundation of China(Nos.51972346,51932011,51802356,and 51872334)Innovation-Driven Project of Central South University(No.2018CX004).
文摘Rechargeable aqueous zinc-ion batteries(AZIBs)have their unique advantages of cost efficiency,high safety,and environmental friendliness.However,challenges facing the cathode materials include whether they can remain chemically stable in aqueous electrolyte and provide a robust structure for the storage of Zn2+.Here,we report on H11Al2V6O23.2@graphene(HAVO@G)with exceptionally large layer spacing of(001)plane(13.36?).The graphene-wrapped structure can keep the structure stable during discharge/charge process,thereby promoting the inhibition of the dissolution of elements in the aqueous electrolyte.While used as cathode for AZIBs,HAVO@G electrode delivers ideal rate performance(reversible capacity of 305.4,276.6,230.0,201.7,180.6 mAh g?1 at current densities between 1 and 10 A g?1).Remarkably,the electrode exhibits excellent and stable cycling stability even at a high loading mass of^15.7 mg cm?2,with an ideal reversible capacity of 131.7 mAh g?1 after 400 cycles at 2 A g?1.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51802356, 51872334 and 51572299)Innovation-Driven Project of Central South University (No. 2018CX004)
文摘Due to the intrinsic advantages of nontoxicity, low-cost, and abundant resource of metallic zinc, aqueous zinc-ion batteries (ZIBs) have attracted universal interest [1,2]. Tremendous cathode materials have been exploited in aqueous ZIBs, such as manganese-based materials [3-11], Co-based materials [12,13] and vanadium-based materials [14-21].
基金supported by the National Natural Science Foundation of the People’s Republic of China“Data-driven high-throughput screening of cathode materials for Zn-ion batteries”(22065032)Undergraduate Education and Teaching Research and Reform Project of Universities in Xinjiang Uygur Autonomous Region“Innovative research on ideological and political education in courses and virtual simulation technology in structural chemistry”(XJGXPTJG-202205).
文摘镍钴氢氧化物由于理论比容量高、经济效益良好、来源广泛等优点,被广泛应用于镍锌电池中作为电极材料。本工作采用共沉淀法,调控具有不同镍钴比例的硝酸盐溶液,在室温环境下一步合成镍钴双金属氢氧化物,并将其制备成镍锌电池正极材料。采用X射线衍射仪(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)等对所合成的样品进行表征,观察其微观形貌结构,采用电化学工作站等研究其作为镍锌电池电极材料的电化学性能。研究发现,采用高浓度Na OH溶液作为电解液,比其他通过共沉淀法所制备的镍钴氢氧化物在镍锌电池中所表现出的容量更高。结果表明,当镍钴投料比为4∶1时,样品具有最为出色的容量表现,其中,Ni_(4)Co_(1)-LDH样品在电流密度为0.5 A/g时容量可以达到327.9 m Ah/g。将其作为正极材料、锌箔作为负极,与高浓度的Na OH溶液一起组装成镍锌电池进行电化学测试,在0.5 A/g电流密度下具有230.7 m Ah/g的容量,该研究兼具材料合成快速和性能表现良好等优点,研究结果有望为镍锌电池性能优化提供新思路。
