A kind of aqueous sodium ion battery

A sodium-ion battery, water-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor electrochemical stability, high solubility, and easy decomposition of water-based sodium-ion batteries

Active Publication Date: 2021-11-23
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, in the aqueous electrolyte, the reaction thermodynamic properties of the sodium-ion battery are seriously affected by the water splitting reaction, which will cause side reactions of hydrogen evolution at the negative electrode and oxygen evolution at the positive electrode, resulting in a lower working voltage of the aqueous sodium-ion battery.
In addition, many sodium salt compounds have high solubility in water, or are easily decomposed in water, resulting in poor electrochemical stability of aqueous sodium-ion batteries, which further limits the selection of energy storage materials.

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  • A kind of aqueous sodium ion battery
  • A kind of aqueous sodium ion battery
  • A kind of aqueous sodium ion battery

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preparation example Construction

[0036] In the present invention, the positive electrode active material for the positive electrode of the aqueous sodium ion battery comprises potassium ion doped sodium vanadium phosphate particles and a carbon layer and a carbon nitrogen layer coated on the surface of the potassium ion doped sodium vanadium phosphate particles in sequence, Wherein, the particle size of the potassium ion-doped sodium vanadium phosphate particles is preferably 200-300 nm, and the total thickness of the carbon layer and the carbon-nitrogen layer is preferably 4-6 nm. In the present invention, the preparation method of the positive electrode active material preferably comprises the following steps:

[0037] Water, citric acid, NH 4 VO 3 , NH 4 h 2 PO 4 , NaOH, KOH and N,N-dimethylamide are mixed, and after removing the solvent in the obtained mixed material, the first carbonization treatment is carried out in a protective atmosphere to obtain potassium ion-doped sodium vanadium phosphate par...

Embodiment 1

[0054] Preparation of positive electrode active material: 15mL deionized water, 1mmol citric acid, 2mmol NH 4 VO 3 and 3 mmol of NH 4 h 2 PO 4Mix and stir for 0.5h, add 2.85mmol of NaOH and 0.15mmol of KOH, continue to stir for 10min, add 50mL of DMF, continue to stir for 3h in a water bath at 80°C, then put the residue in an oven and dry at 70°C for 12h ; The resulting dried material is ground and put into a tube furnace under Ar-H 2 Mixed atmosphere (H 2 The volume fraction is 5%), heat preservation treatment at 400°C for 4h, then raise the temperature to 750°C at a rate of 5°C / min, and heat preservation treatment at 750°C for 8h, to obtain potassium ion-doped carbon layer coating Sodium vanadium phosphate, denoted as NKVP-C;

[0055] The NKVP-C was mixed with 75 mL of trimethylolmethane buffer solution with a concentration of 0.5 mol / L, ultrasonicated for 30 min, and then hydrochloric acid with a concentration of 1 mol / L was added dropwise under stirring conditions to...

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Abstract

The invention provides an aqueous sodium ion battery, which belongs to the technical field of sodium ion batteries. The aqueous sodium ion battery provided by the invention comprises positive pole, negative pole, separator and electrolyte, and described electrolyte is NaClO 4 , a mixture of water and acetonitrile; the positive active material for the positive electrode includes potassium ion doped sodium vanadium phosphate particles and a carbon layer and a carbon nitrogen layer that are sequentially coated on the surface of the potassium ion doped sodium vanadium phosphate particles. The aqueous sodium-ion battery provided by the present invention has a discharge voltage of 1.2V and a high discharge specific capacity, and the positive electrode active material is charged and discharged at a constant current for 100 cycles in a three-electrode system under the condition of a current density of 1A / g In the test experiment, the first discharge specific capacity reached 97.8mAh g ‑1 .

Description

technical field [0001] The invention relates to the technical field of sodium ion batteries, in particular to an aqueous sodium ion battery. Background technique [0002] Large-scale power storage is one of the key issues in the development of new energy technologies. Whether it is the utilization of renewable new energy (such as photovoltaic or wind power) or the widespread use of electric vehicles, large-scale power storage is required as technical support. Among the existing large-scale power storage methods, secondary battery technology has received extensive attention. [0003] Traditional lead-acid batteries and cadmium-nickel batteries contain a large amount of harmful heavy metal elements, and large-scale application will pollute the environment. Lithium-ion batteries have low standard potential and high specific capacity, and are widely used, but lithium prices are high and its resource reserves are small. Compared with lithium, the reserves of sodium are considera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/36H01M4/36H01M4/58H01M4/62
CPCH01M4/366H01M4/5825H01M4/625H01M10/36Y02E60/10
Inventor 邢伟申艳新高秀丽
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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