Method for preparing modified graphite negative electrode material of sodium ion battery

Abstract

The invention provides a method for preparing a modified graphite negative electrode material of a sodium ion battery and aims at solving the problem of lacking of a suitable negative electrode material of the sodium ion battery at present. The method comprises the steps of preparing paste graphite oxide by using a Hummer method, cladding the graphite oxide with asphalt, phenolic resin or glucose as carbon precursors, and carrying out carbonization heat treating on the graphite oxide clad with the carbon precursors under an inert gas atmosphere. The method has the advantages of being simple, wide in raw material sources, suitable for large-scale industrial production, and the like. According to the obtained modified graphite negative electrode material, the carbon layer spacing is not less than 0.35nm, and the thickness of the carbon clad layer is 0.01-1 micron.

Description

technical field

[0001] The invention belongs to the field of sodium-ion secondary batteries, and in particular relates to a preparation method of a modified graphite negative electrode material for a sodium-ion battery. Background technique

[0002] With the development and progress of the social economy, the human demand for energy has increased dramatically. Continuing to accelerate the consumption of fossil energy will bring enormous pressure to the environment. The development of new energy has become the only way to get rid of dependence on fossil energy, reduce environmental pollution, and achieve low-carbon economy and sustainable development. Many new energy sources (such as solar energy, wind energy, tidal energy, etc.) are intermittent and random. When supplying power to fixed equipment, it is necessary to introduce energy storage devices such as batteries to achieve continuous and stable power supply to the grid; when supplying power to mobile equipment, it is ne...

Examples

Embodiment 1

[0028] (1) Take 200mL98% concentrated H 2 SO 4 Add to the reaction vessel placed in the ice bath, stir at 20rpm, then add 10g of natural flake graphite with a particle size of 10-30μm and 30g of KMnO 4 Add it into the reactor and react for 30 minutes; then transfer the above reaction solution into a warm water bath at 39±1°C and continue stirring for 30 minutes; then raise the temperature of the reaction solution to 95-98°C, add 600mL deionized water and continue stirring for 30 minutes; finally add 60 mL of H with a mass fraction of 5% 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0029] (2) Add 0.8g of water-based phenolic resin into 28mL of deionized water, fully dissolve, then add 8g of the paste-like graphite oxide obtained in step 2...

Embodiment 2

[0034] (1) Take 250mL95% concentrated H 2 SO 4 Add it to the reaction vessel placed in the ice bath, stir at 100rpm, then add 10g of natural flake graphite with a particle size of 10-30μm and 40g of KMnO 4 Add it into the reactor and react for 60 minutes; then transfer the above reaction solution into a warm water bath at 41±1°C and continue stirring for 60 minutes; then raise the temperature of the reaction solution to 98-100°C, add 1250mL deionized water and continue stirring for 60 minutes; 125 mL mass fraction of 5% H 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0035] (2) Add 4g of petroleum pitch into 40mL of kerosene, fully dissolve, then add 8g of graphite oxide prepared in step 2, stir at 100rpm until uniformly mixed, and dry at...

Embodiment 3

[0039] (1) Take 230mL98% concentrated H 2 SO 4 Add it to the reaction vessel placed in the ice bath, stir at 50rpm, then add 10g of artificial graphite with a particle size of 1-10μm and 35g of KMnO 4 Add it into the reactor and react for 45 minutes; then transfer the above reaction solution into a warm water bath at 40±2°C and continue stirring for 45 minutes; then raise the temperature of the reaction solution to 98±2°C, add 920mL deionized water and continue stirring for 45 minutes; finally add 92 mL mass fraction of 5% H 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0040] (2) Add 2.0g of glucose into 50mL of deionized water, fully dissolve, then add 8g of the paste graphite oxide obtained in step 2, stir until evenly mixed, and dry a...

technical field

[0001] The invention belongs to the field of sodium-ion secondary batteries, and in particular relates to a preparation method of a modified graphite negative electrode material for a sodium-ion battery. Background technique

[0002] With the development and progress of the social economy, the human demand for energy has increased dramatically. Continuing to accelerate the consumption of fossil energy will bring enormous pressure to the environment. The development of new energy has become the only way to get rid of dependence on fossil energy, reduce environmental pollution, and achieve low-carbon economy and sustainable development. Many new energy sources (such as solar energy, wind energy, tidal energy, etc.) are intermittent and random. When supplying power to fixed equipment, it is necessary to introduce energy storage devices such as batteries to achieve continuous and stable power supply to the grid; when supplying power to mobile equipment, it is ne...

Examples

Embodiment 1

[0028] (1) Take 200mL98% concentrated H 2 SO 4 Add to the reaction vessel placed in the ice bath, stir at 20rpm, then add 10g of natural flake graphite with a particle size of 10-30μm and 30g of KMnO 4 Add it into the reactor and react for 30 minutes; then transfer the above reaction solution into a warm water bath at 39±1°C and continue stirring for 30 minutes; then raise the temperature of the reaction solution to 95-98°C, add 600mL deionized water and continue stirring for 30 minutes; finally add 60 mL of H with a mass fraction of 5% 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0029] (2) Add 0.8g of water-based phenolic resin into 28mL of deionized water, fully dissolve, then add 8g of the paste-like graphite oxide obtained in step 2...

Embodiment 2

[0034] (1) Take 250mL95% concentrated H 2 SO 4 Add it to the reaction vessel placed in the ice bath, stir at 100rpm, then add 10g of natural flake graphite with a particle size of 10-30μm and 40g of KMnO 4 Add it into the reactor and react for 60 minutes; then transfer the above reaction solution into a warm water bath at 41±1°C and continue stirring for 60 minutes; then raise the temperature of the reaction solution to 98-100°C, add 1250mL deionized water and continue stirring for 60 minutes; 125 mL mass fraction of 5% H 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0035] (2) Add 4g of petroleum pitch into 40mL of kerosene, fully dissolve, then add 8g of graphite oxide prepared in step 2, stir at 100rpm until uniformly mixed, and dry at...

Embodiment 3

[0039] (1) Take 230mL98% concentrated H 2 SO 4 Add it to the reaction vessel placed in the ice bath, stir at 50rpm, then add 10g of artificial graphite with a particle size of 1-10μm and 35g of KMnO 4 Add it into the reactor and react for 45 minutes; then transfer the above reaction solution into a warm water bath at 40±2°C and continue stirring for 45 minutes; then raise the temperature of the reaction solution to 98±2°C, add 920mL deionized water and continue stirring for 45 minutes; finally add 92 mL mass fraction of 5% H 2 o 2 Mix well, filter while hot, wash the filter residue with HCl with a mass fraction of 5%, until there is no SO in the filtrate 4 2- (with BaC1 2 solution detection), then fully washed with deionized water to neutrality, vacuum filtration, to obtain paste-like graphite oxide;

[0040] (2) Add 2.0g of glucose into 50mL of deionized water, fully dissolve, then add 8g of the paste graphite oxide obtained in step 2, stir until evenly mixed, and dry a...

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