Aqueous multivalent-metal-ion intercalation chemistries hold genuine promise to develop safe and pow-erful microbatteries for potential use in many miniaturized electronics.However,their development is beset by state-of-the-art electrode materials having practical capacities far below their theoretical val-ues.Here we demonstrate that high compatibility between layered transition-metal oxide hosts and hydrated cation guests substantially boost their multi-electron-redox reactions to offer higher capaci-ties and rate capability,based on typical bipolar vanadium oxides preintercalated with hydrated cations(MxV2O5).When seamlessly integrated on Au current microcollectors with a three-dimensional bicon-tinuous nanoporous architecture that offers high pathways of electron transfer and ion transport,the constituent ZnxV2O5 exhibits specific capacity of as high as～527 mAh g-1 at 5 mV s-1 and re-tains～300 mAh g-1 at 200 mV s-1 in 1 M ZnSO4 aqueous electrolyte,outperforming the MxV2O5(M = Li,Na,K,Mg).This allows aqueous rechargeable zinc-ion microbatteries constructed with sym-metric nanoporous ZnxV2O5/Au interdigital microelectrodes as anode and cathode to show high-density energy of～358 mWh cm-3(a value that is forty-fold higher than that of 4 V/500 μAh Li thin film bat-tery)at high levels of power delivery.

Sheng-Bo Wang;Qing Ran;Wu-Bin Wan;Hang Shi;Shu-Pei Zeng;Zi Wen;Xing-You Lang;Qing Jiang

Key Laboratory of Automobile Materials(Jilin University),Ministry of Education and School of Materials Science and Engineering,Jilin University,Changchun 130022,China;State Key Laboratory of Automotive Simulation and Control,Jilin University,Changchun 130022,China

材料科学技术（英文版）

[1]Sheng-Bo Wang;Qing Ran;Wu-Bin Wan;Hang Shi;Shu-Pei Zeng;Zi Wen;Xing-You Lang;Qing Jiang-.Ultrahigh-energy and-power aqueous rechargeable zinc-ion microbatteries based on highly cation-compatible vanadium oxides)[J].材料科学技术（英文版）,2022(25):159-166

microbatteries,preintercalated,MxV2O5,microcollectors,bicon

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