Preparation method of sodium titanium phosphate double-nano carbon in anode material of sodium-ion battery

A technology of sodium ion battery and negative electrode material, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effect of improving high rate performance and cycle stability, strong interface bonding, and high chemical stability

Inactive Publication Date: 2019-05-07
XIAN TECHNOLOGICAL UNIV
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Problems solved by technology

So far, it is not possible to convert NaTi 2 (PO 4 ) 3 The sodium storage performance of negative electrode materials has been improved to the practical application level, and more effective synthesis route

Method used

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preparation example Construction

[0024] Such as figure 1 As shown, the embodiment of the present invention provides a method for preparing a sodium titanium sodium phosphate double nanocarbon as the negative electrode material of a sodium ion battery, comprising the following steps:

[0025] (1) Preparation of graphene oxide

[0026] Using high-quality flake graphite as the starting material, graphene oxide was prepared by the improved Hummers method.

[0027] (2) Preparation of sulfur-doped graphene

[0028] Disperse the obtained graphene oxide in ethanol solution at a certain concentration, add diphenyl disulfide dopant after ultrasonic dispersion and magnetic stirring for a certain period of time, then magnetically stir to a dry state under specific temperature conditions and fill it with argon High-temperature heat treatment in a tube furnace for a certain period of time. Finally, the sulfur-doped graphene product was washed several times with deionized water and ethanol, and placed in an oven for dryi...

Embodiment

[0035] S1, graphene oxide preparation:

[0036] Add 1.5g of flake graphite with a particle size of 300 mesh, 0.75g of NaNO to a 250mL beaker 3 , 35mL concentrated sulfuric acid, placed in an ice-water bath at 0-4°C for 1.5-3 hours, then slowly added 4.5g KMnO 4 , keep the ice-water bath for 2 hours, then transfer to a water bath at 35°C, react for 2 hours, slowly add 50mL of distilled water to the beaker to dilute, and finally add 7.5mL of 30% hydrogen peroxide to the beaker to obtain golden yellow Precipitation is graphite oxide;

[0037] S2. Let the beaker stand for 1 to 2 hours until the graphite oxide precipitates to the bottom of the beaker, pour off the supernatant, take the graphite oxide precipitate and wash it with 5% hydrochloric acid solution for several times, wash it with distilled water until the solution is neutral, and centrifuge Separation, and drying the obtained graphite oxide precipitate in an 80°C drying oven for 24 hours;

[0038] S3. Take 100 mg of dr...

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Abstract

The invention discloses a preparation method of sodium titanium phosphate double-nano carbon in an anode material of a sodium-ion battery. NaTi2(PO4)3 particles with nanometer sizes are prepared through adoption of the sol-gel method combined with a freeze drying technology and a rapid microwave radiation heating method, and an in-situ synthesis method design is combined to synthesize the composite nano material of the NaTi2(PO4)3 with a specific micro morphology and the dual carbon nanomaterial (carbon film and sulfur-doped graphene) so as to improve the sodium storage property of the NaTi2(PO4)3. The synthesis method can prepare a high-quality NaTi2(PO4)3@double nano carbon composite electrode material in a large scale in a short time, and the synthetic route is a novel and effective method at the aspect of constructing the nanoscale-size NaTi2(PO4)3@carbon composite electrode material.

Description

technical field [0001] The invention relates to the field of preparation of electrode materials for sodium ion batteries, in particular to a method for preparing sodium titanium phosphate double nanocarbons as negative electrode materials for sodium ion batteries. Background technique [0002] Human beings' continuous concern on the global energy supply has stimulated the development of energy storage technologies with the advantages of cyclic charging and discharging, high capacity, long cycle life and low cost to a certain extent. At present, lithium-ion battery has developed into one of the most promising energy technologies, and it has been widely used in portable electronic products, hybrid electric vehicles, pure electric vehicles and other fields. However, the further development of Li-ion batteries is limited due to high cost and scarcity of Li resources. In recent years, researchers have been looking for a competitive energy technology that can replace lithium-ion ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/62H01M10/054
CPCY02E60/10
Inventor 颜海燕
Owner XIAN TECHNOLOGICAL UNIV
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