3.9 V电化学稳定窗口的乙酸盐电解液用于低成本高性能的水系钠离子电池
收稿日期: 2021-02-22
修回日期: 2021-03-10
网络出版日期: 2021-03-27
基金资助
国家自然科学基金面上项目(21673051);广东省科技厅国际合作项目(2019A050510043);广东省科技厅产学研重大专项(2017B010119003)
版权
Acetate Solutions with 3.9 V Electrochemical Stability Window as an Electrolyte for Low-Cost and High-Performance Aqueous Sodium-Ion Batteries
Received date: 2021-02-22
Revised date: 2021-03-10
Online published: 2021-03-27
Copyright
兰道云 , 屈小峰 , 唐宇婷 , 刘丽英 , 刘军 . 3.9 V电化学稳定窗口的乙酸盐电解液用于低成本高性能的水系钠离子电池[J]. 电化学, 2022 , 28(1) : 2102231 . DOI: 10.13208/j.electrochem.210223
Low-cost and high-safety aqueous sodium-ion batteries have received widespread attention in the field of large-scale energy storage, but the narrow electrochemical stability window (1.23 V) of water limits the energy density of aqueous sodium-ion batteries. The “water-in-salt” strategy which uses the interaction between cations and water molecules in the solution can inhibit water decomposition and broaden the electrochemical stability window of water. In this work, two types of low-cost salts, namely, ammonium acetate (NH4CH3COOH) and sodium acetate (NaCH3COOH), were used to configure a mixed aqueous electrolyte for aqueous sodium-ion batteries. The solution consisted of 25 mol·L -1 NH4CH3COOH and 5 mol·L-1 NaCH3COOH, used as an aqueous electrolyte, exhibited a wide electrochemical stability window of 3.9 V and high ionic conductivity of 28.2 mS·cm-1. The composite of layered manganese dioxide and multi-wall carbon nanotubes (MnO2/CNTs) was used as a positive electrode material, while the carbon-coated NaTi2(PO4)3 with NASICON structure was used as a negative electrode material. Both of these electrode materials had excellent electrochemical performances in the aqueous electrolyte. A full cell achieved an average working voltage of about 1.3 V and a discharge capacity of 74.1 mAh·g-1 at a current density of 0.1 A·g-1. This aqueous sodium-ion battery displayed excellent cycling stability with negligible capacity losses (0.062% per cycle) for 500 cycles. The safe and environmentally friendly aqueous acetate electrolyte, with a wide electrochemical stability window, showed the potential to be matched with positive materials having higher potential and negative materials having lower potential for further improving the voltage of aqueous sodium-ion batteries and promoting the development of aqueous batteries for large-scale energy storage technology.
Key words： sodium ion battery; aqueous electrolyte; ammonium acetate; water-in-salt
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