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High-performance aqueous sodium-ion battery using a hybrid electrolyte with a wide electrochemical stability window.

ABSTRACT: The practical application of aqueous sodium-ion batteries (ASIBs) is limited by the electrolysis of water, which results in a low working voltage and energy density of ASIBs. Here, a NaClO₄-based acetonitrile/water hybrid electrolyte (NaClO₄(H₂O)₂AN_2.4) is applied to ASIBs for the first time, which effectively extends the electrochemical stability window (ESW) to 3.0 V and reduces the internal resistance of the battery. Based on this hybrid electrolyte, an ASIB full cell using carbon coated Na_2.85K_0.15V₂(PO₄)₃ and NaTi₂(PO₄)₃ as the cathode and anode materials, respectively, can afford a discharge capacity and energy density of 52 mA h g^-1 and 51 W h kg^-1, respectively, at a current density of 1 A g^-1. The energy density of this battery exceeds almost all reported traditional ASIBs.

SUBMITTER: Shen Y

PROVIDER: S-EPMC9055268 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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High-performance aqueous sodium-ion battery using a hybrid electrolyte with a wide electrochemical stability window.

Shen Yanxin Y Han Xiaonan X Cai Tonghui T Hu Haoyu H Li Yanpeng Y Zhao Lianming L Hu Han H Xue Qingzhong Q Zhao Yi Y Zhou Jin J Gao Xiuli X Xing Wei W Wang Xiaoning X

RSC advances 20200706 43

The practical application of aqueous sodium-ion batteries (ASIBs) is limited by the electrolysis of water, which results in a low working voltage and energy density of ASIBs. Here, a NaClO4-based acetonitrile/water hybrid electrolyte (NaClO4(H2O)2AN2.4) is applied to ASIBs for the first time, which effectively extends the electrochemical stability window (ESW) to 3.0 V and reduces the internal resistance of the battery. Based on this hybrid ...[more]

PMID: 35518583

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