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Positive electrode material for lithium-ion battery and preparation method of positive electrode material

A technology for lithium ion batteries and cathode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as ion obstruction and affect the kinetic properties of cathode materials, and achieve reduced resistance, excellent electrochemical performance, and improved electrical performance. Effects of chemical properties

Inactive Publication Date: 2017-09-26
GUANGDONG ZHUGUANG NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the unique two-dimensional planar structure of the graphene material has an obvious hindering effect on the transport of ions in and out of the positive electrode particles of lithium-ion batteries, thus affecting the dynamic performance of the positive electrode materials of lithium-ion batteries.

Method used

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  • Positive electrode material for lithium-ion battery and preparation method of positive electrode material

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Embodiment 1

[0029] Embodiment 1, differs from comparative example in that this embodiment comprises the following steps:

[0030] Step 1. Preparation of the core structure: select 100nm lithium iron phosphate particles, mix them evenly with the components of the conductive agent (the conductive agent is conductive carbon black, the same below) and then make pellets to obtain a secondary particle core structure with a particle diameter of about 12 μm stand-by;

[0031] Step 2, preparation of coating layer slurry: heat and liquefy the asphalt; uniformly disperse graphene with a sheet diameter of 37.68 μm in NMP solvent, and then add it to the asphalt; stir evenly to obtain the coating layer raw material;

[0032] In step 3, the core structure material described in step 1 is placed in the cladding layer raw material obtained in step 2 for coating, and then carbonized to obtain the finished lithium ion battery positive electrode material.

Embodiment 2

[0033] Embodiment 2 is different from Embodiment 1 in that this embodiment includes the following steps:

[0034] Step 2, preparing coating layer slurry: heat and liquefy the asphalt; uniformly disperse graphene with a sheet diameter of 25.12 μm in NMP solvent, and then add it to the asphalt; stir evenly to obtain the coating layer raw material;

[0035] Others are the same as in Example 1, and will not be repeated here.

Embodiment 3

[0036] Embodiment 3 is different from Embodiment 1 in that this embodiment includes the following steps:

[0037] Step 2, prepare coating layer slurry: heat and liquefy the asphalt; uniformly disperse graphene with a sheet diameter of 15 μm in NMP solvent, and then add it to the asphalt; stir evenly to obtain the coating layer raw material;

[0038] Others are the same as in Example 1, and will not be repeated here.

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Abstract

The invention belongs to the field of energy storage research, and particularly relates to a positive electrode material for a lithium-ion battery. The positive electrode material for the lithium-ion battery comprises a core structure and a shell structure, wherein the shell structure uniformly wraps the surface of the core structure; the core structure has the particle diameter of D1; the shell structure has the thickness of h1; the shell structure contains graphene; the graphene has the lamellar thickness h2 being smaller than or equal to 100nm; the graphene has the lamellar planar diameter d1 being smaller than or equal to Pi*D1. Therefore, the positive electrode material for the lithium-ion battery, having excellent electrochemical performance, is prepared.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and in particular relates to a positive electrode material of a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have brought revolutionary changes to the field of energy storage since their birth due to their advantages such as fast charging and discharging, good low-temperature performance, large specific energy, small self-discharge rate, small size, and light weight. Used in various portable electronic devices and electric vehicles. However, with the improvement of people's living standards, higher user experience puts forward higher requirements for lithium-ion batteries: longer standby time, faster charging and discharging speed, etc.; in order to solve the above problems, it is necessary to find new ones with better performance electrode material. [0003] At present, the commercial lithium-ion battery cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/587H01M4/60H01M4/62H01M4/133H01M4/1393H01M10/0525
CPCH01M4/133H01M4/1393H01M4/505H01M4/525H01M4/587H01M4/602H01M4/62H01M10/0525Y02E60/10
Inventor 毛方会杨玉洁
Owner GUANGDONG ZHUGUANG NEW ENERGY TECH
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