A high-capacity electrode material for high-nitrogen-doped carbon-coated sodium metal sulfide secondary batteries and its application
A metal sulfide, sodium secondary battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of difficult to suppress the reversibility of the conversion reaction and the capacity decay, and achieve the improvement of reversibility and capacity retention rate, The effect of excellent rate performance and excellent cycle stability
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Embodiment 1
[0030] A method for preparing a high-capacity electrode material for a sodium secondary battery, a high-nitrogen-doped carbon-coated metal sulfide, the steps are as follows:
[0031] (1) Preparation of Ni metal-organic framework precursor: Weigh 0.2 mmol of Ni(NO 3 ) 2 ·6H 2 O and 0.2mmol of isophthalic acid were dissolved in a mixed solution of N,N-dimethylformamide and acetone (V DMF :V 丙酮 =1:1), transferred to a polytetrafluoroethylene reactor at 150°C for 0.5h, cooled to room temperature and centrifuged (9000r), and then dried at 60°C for 4h to obtain a Ni metal organic framework precursor.
[0032] (2) Preparation of carbon-coated nickel metal intermediate: place the precursor obtained above in an argon atmosphere, -1 The heating rate is heated to 400 ° C for 2 h, and then lowered to room temperature to obtain a carbon-coated nickel metal intermediate.
[0033] (3) Preparation of high-nitrogen-doped carbon-coated nickel sulfide: Mix the carbon-coated Ni metal interme...
Embodiment 2
[0036] A method for preparing a high-capacity electrode material for a sodium secondary battery, a high-nitrogen-doped carbon-coated metal sulfide, the steps are as follows:
[0037] (1) The process of preparing Ni metal-organic framework precursor is the same as Example 1.
[0038] (2) Preparation of carbon-coated nickel metal intermediate: place the precursor obtained above in an argon atmosphere, -1 The heating rate is heated to 500 ° C for 2 h, and then lowered to room temperature to obtain a carbon-coated nickel metal intermediate.
[0039] (3) Preparation of low nitrogen-doped carbon-coated nickel sulfide: Mix the carbon-coated nickel metal intermediate with thiourea at a mass ratio of 1:2 and grind for 0.5 h, then transfer to an argon atmosphere and heat at 1 °C min -1 The heating rate was heated to 300°C for 2 hours, and the sample was obtained after cooling down to room temperature. The nitrogen content in the sample was 16.7% (at%).
[0040] The electrochemical pe...
Embodiment 3
[0042] A method for preparing a high-capacity electrode material for a sodium secondary battery, a high-nitrogen-doped carbon-coated metal sulfide, the steps are as follows:
[0043] (1) The process of preparing Ni metal-organic framework precursor is the same as Example 1.
[0044] (2) Preparation of carbon-coated nickel metal intermediate: place the precursor obtained above in an argon atmosphere, -1 The heating rate is heated to 600 ° C for 2 h, and then lowered to room temperature to obtain a carbon-coated nickel metal intermediate.
[0045] (3) Preparation of low-nitrogen-doped carbon-coated nickel sulfide: the carbon-coated nickel metal intermediate and thiourea were mixed at a mass ratio of 1:2 and ground for 0.5 h, then transferred to an argon atmosphere and heated at 1 °C min -1 The heating rate was heated to 300 ° C for 2 hours, and the sample was obtained after cooling down to room temperature. The nitrogen content in the sample was 7.9% (at%).
[0046] The electr...
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