Preparation method of graphene-coated positive electrode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of weakening battery processability and safety performance, and achieve the goal of reducing difficulty, increasing capacity, and reducing DC internal resistance Effect

Active Publication Date: 2019-08-23
宁夏汉尧富锂科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Uneven dispersion of graphene on the surface of the positive electrode material will cause agglomeration, which makes the material highly oxidizable

Method used

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  • Preparation method of graphene-coated positive electrode material of lithium ion battery
  • Preparation method of graphene-coated positive electrode material of lithium ion battery

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preparation example Construction

[0021] In some embodiments, the preparation method of the graphene-coated lithium-ion battery cathode material of the alignment comprises the following steps:

[0022] (1) Preparation of mixed slurry;

[0023] (2) After the mixed slurry is subjected to the action of an electromagnetic field, it is then dried to obtain a powder substance;

[0024] (3) Composite the dried powder material to obtain an aligned graphene-coated lithium-ion battery positive electrode material.

[0025] In some embodiments, the magnetic induction of the electromagnetic field is 0.3-0.8T; preferably, the magnetic induction of the electromagnetic field is 0.4-0.7T; more preferably, the magnetic induction of the electromagnetic field is 0.6T.

[0026] In some embodiments, the drying process uses spray drying, and the spray drying temperature is 120-300°C; preferably, the spray drying temperature is 150-270°C; more preferably, the spray drying temperature is 250°C.

[0027] In some embodiments, the pres...

Embodiment 1

[0052] Embodiment 1 of the present invention provides a kind of lithium-ion battery anode material coated with graphene of alignment, and its preparation method comprises the following steps:

[0053] (1) Preparation of mixed slurry;

[0054] (2) After the mixed slurry is subjected to the action of an electromagnetic field with a magnetic induction intensity of 0.6T, it is spray-dried to obtain a powder substance, wherein the spray-drying temperature is 250°C, the spray-drying atomization gas pressure is 0.2MP, and the spray-drying uses nitrogen as a protective gas;

[0055] (3) Composite the dried powder material to obtain the lithium-ion battery anode material coated with graphene in an orientation arrangement, the rotating speed of the composite process is 4000rpm, and the composite time of the composite process is 30min;

[0056] The preparation process of mixed slurry comprises the following steps:

[0057] (1) Mix binder-1 and organic solvent-1, stir at room temperatur...

Embodiment 2

[0067] Embodiment 2 of the present invention provides a lithium-ion battery anode material coated with graphene in alignment, and its preparation method comprises the following steps:

[0068] (1) Preparation of mixed slurry;

[0069] (2) After the mixed slurry is subjected to the action of an electromagnetic field with a magnetic induction intensity of 0.8T, it is spray-dried to obtain a powder substance, wherein the spray-drying temperature is 300°C, the spray-drying atomization gas pressure is 0.30MP, and the spray-drying uses nitrogen as a protective gas;

[0070] (3) Composite the dried powder material to obtain the lithium-ion battery anode material coated with graphene in an orientation arrangement, the rotating speed of the composite process is 6000rpm, and the composite time of the composite process is 60min;

[0071] The preparation process of mixed slurry comprises the following steps:

[0072] (1) Mix binder-1 and organic solvent-1, and stir at room temperature f...

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Abstract

The invention belongs to the technical field of lithium ion battery positive electrode materials, and particularly provides a preparation method of a graphene-coated positive electrode material of a lithium ion battery. The invention provides the preparation method of a directionally-arranged graphene-coated positive electrode material of the lithium ion battery. The preparation method comprises the following steps: preparing mixed slurry, and performing drying and compounding, wherein the raw materials of the mixed slurry comprise a binder, graphene and a positive electrode active substance;spray drying is utilized in the drying process, wherein the temperature of spray drying is 120-300 DEG C.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and specifically, the invention provides a preparation method of graphene-coated lithium-ion battery cathode materials. Background technique [0002] With the development of lithium-ion batteries and related material preparation technologies in recent years, lithium-ion batteries have undoubtedly replaced nickel-metal hydride, lead-acid and other batteries to become a new generation of power sources with high technological content and the most widely used. High, good cycle performance, good safety performance and other advantages, known as "the most promising chemical power source", China has become one of the fastest-growing and most active regions in the world for lithium batteries. New energy vehicles have become a new growth point and pillar for industrial technology upgrading and economic development in countries all over the world. However, there are still cert...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/625H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 王欣全杜萍刘晓雨张永龙王浩步绍宁温宇于春奇
Owner 宁夏汉尧富锂科技有限责任公司
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