A kind of hierarchical structure lithium battery cathode composite material and its preparation method and lithium battery

A composite material and hierarchical structure technology, applied to battery electrodes, secondary batteries, structural parts, etc., can solve problems such as complex methods, difficult regulation, and low output, and achieve improved cycle and rate performance, and improved rapid charge and discharge capabilities , Improve the effect of electrochemical performance

Active Publication Date: 2018-06-05
河北伟斯特汽配科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current methods for preparing electrode materials with hierarchical porous structures are complex, difficult to control, and low in yield.

Method used

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  • A kind of hierarchical structure lithium battery cathode composite material and its preparation method and lithium battery
  • A kind of hierarchical structure lithium battery cathode composite material and its preparation method and lithium battery

Examples

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preparation example Construction

[0081] Another aspect of the present application relates to a method for preparing a positive electrode composite material of a hierarchical structure lithium battery, which is characterized in that it comprises the following steps:

[0082] In step (1), polystyrene microspheres are dispersed in water or DMF to obtain polystyrene dispersion A;

[0083] In step (2), under ultrasonic conditions, the polystyrene dispersion A in step (1) is added to the graphene oxide suspension to obtain a mixed solution B;

[0084] Step (3), dissolving the metal salt and urea in water, and adding them to the mixed solution B obtained in step (2), continuing the ultrasonic dispersion for 1-3 hours, then transferring the reaction solution to an airtight container for hydrothermal or solvothermal reaction , to obtain product C;

[0085] Step (4), adding the product C and lithium salt described in step (3) into a solvent, ultrasonically dispersing, transferring the reaction solution to a closed con...

Embodiment 1

[0094] Example 1: A hierarchical structure lithium iron phosphate / reduced graphene oxide composite material

[0095] Step (1), dispersing polystyrene microspheres with diameters of 90, 350, and 900 nm in DMF to obtain a polystyrene dispersion with a concentration of 2 mg / ml, thereby obtaining A1, A2, and A3 dispersions;

[0096] Step (2), under ultrasonic conditions, add 12ml A1 and 8ml A2 polystyrene dispersion into 40ml of 4mg / ml graphene oxide suspension to obtain mixed solution B1;

[0097] In step (3), 493.10 mg of anhydrous ferric chloride, 431.56 mg of disodium hydrogen phosphate, and 5.48 g of urea were dissolved in water, and added to the mixed liquid B1 obtained in step (2), and after ultrasonic dispersion was continued for 1 h, the reaction liquid was Transfer to an airtight container for solvothermal reaction at 180°C for 24 hours to obtain product C1;

[0098] In step (4), add the product C1 and 72.78 mg of lithium hydroxide described in step (3) into deionized w...

Embodiment 2

[0100] Example 2: A hierarchical structure lithium iron phosphate / reduced graphene oxide composite material

[0101] Step (1), dispersing polystyrene microspheres with diameters of 90, 350, and 900 nm in DMF to obtain a polystyrene dispersion with a concentration of 2 mg / ml, thereby obtaining A1, A2, and A3 dispersions;

[0102] Step (2), under ultrasonic conditions, add 14ml A1 and 6ml A3 polystyrene dispersion into 40ml of 4mg / ml graphene oxide suspension to obtain mixed solution B2;

[0103] In step (3), 493.10 mg of anhydrous ferric chloride, 431.56 mg of disodium hydrogen phosphate, and 5.48 g of urea were dissolved in water, and added to the mixed liquid B2 obtained in step (2), and after ultrasonic dispersion was continued for 1 h, the reaction liquid Transfer to an airtight container for solvothermal reaction at 180°C for 24 hours to obtain product C2;

[0104] In step (4), add the product C2 and 72.78 mg of lithium hydroxide described in step (3) into deionized water...

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Abstract

The invention discloses a lithium battery anode composite material with a hierarchical structure and a preparation method of the composite material and a lithium battery. The composite material is prepared from polystyrene spheres, graphene oxide, metal salt, urea and lithium salt. According to the method, the hierarchical and porous structure is constructed for a template through the graded polystyrene spheres of the different sizes, therefore, the specific capacity of the electrode material is significantly increased, and meanwhile the better rate capability and cycle performance are achieved.

Description

technical field [0001] The invention relates to the field of materials and the field of lithium battery positive electrode materials, in particular to a preparation method of a hierarchical structure lithium battery positive electrode composite material and a lithium battery. Background technique [0002] The elderly scooter is an ideal vehicle for the elderly to travel outdoors. Its performance is relatively stable, the speed of the vehicle is slow, and it does not need refueling when using electricity, so it is also called an environmentally friendly elderly vehicle. There are many energy sources used by elderly electric vehicles, mainly including lead-acid batteries (including lead-acid colloid batteries), nickel-metal hydride batteries, and nickel-cadmium batteries. Batteries, nickel-iron batteries, lithium-ion batteries (often called lithium batteries), fuel cells, etc. Among them, lithium-ion batteries have the advantages of high energy density, long cycle life, and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M10/0525
CPCH01M4/364H01M10/0525Y02E60/10
Inventor 杨福生杨伟进秦玉秋许庆亮张志磊
Owner 河北伟斯特汽配科技有限公司
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