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Preparation method of electrode material, electrode material, electrode and lithium ion battery

A technology of electrode materials and composite materials, applied in the field of batteries, can solve the problems of low electrode conductivity, etc., and achieve the effects of high ionic conductivity, easy mass production, and enhanced ionic conductivity.

Active Publication Date: 2020-06-26
SHENZHEN HYNETECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problem of low electrode conductivity, it is necessary to provide a preparation method of an electrode material with high ionic conductivity and a corresponding electrode material

Method used

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  • Preparation method of electrode material, electrode material, electrode and lithium ion battery
  • Preparation method of electrode material, electrode material, electrode and lithium ion battery

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preparation example Construction

[0038] The invention provides a preparation method of an electrode material. It includes the following steps.

[0039] Step S1, mixing the electrode active material with the solid electrolyte or the precursor of the solid electrolyte and then granulating to obtain a composite material, wherein the solid electrolyte includes an organic solid electrolyte or an organic-inorganic composite solid electrolyte, and the organic-inorganic composite Solid electrolytes include organic solid electrolytes and inorganic solid electrolytes.

[0040] In this step, the purpose of firstly mixing the electrode active material with the solid electrolyte or the precursor of the solid electrolyte is to refine and fully contact the electrode active material with the solid electrolyte or the precursor of the solid electrolyte in advance. The electrolyte has a high ionic conductivity, so that it can fully contact the electrode active material first, which can effectively improve the ion transport per...

Embodiment 1

[0072] Embodiment 1: Lithium cobaltate positive electrode

[0073] (1) The positive electrode active material is lithium cobaltate positive electrode material with a median particle size of 5um; the lithium salt in the organic solid electrolyte selected is LiFSI, the polymer is PVDF-HFP, the plasticizer is EC, and the inorganic filler is Al 2 o 3 , the mass ratio of the lithium salt to the polymer is 5:1, the mass ratio of the plasticizer to the polymer is 60:100, and the mass proportion of the inorganic filler is 1%.

[0074] (2) Mixing by dry mixing method, the above-mentioned lithium cobaltate and organic solid electrolyte are mixed by ball milling at a weight ratio of 100:5, and after mixing, they are mechanically pulverized to form an active material-electrolyte composite material.

[0075] (3) The above-mentioned active material-electrolyte composite material and conductive carbon black Super-P were uniformly mixed according to the weight ratio of 100:10, and the electr...

Embodiment 2

[0076] Embodiment 2: graphite negative electrode

[0077] (1) The negative electrode active material is a graphite negative electrode material with a median particle size of 8um; in the selected organic-inorganic composite solid electrolyte, the lithium salt in the organic electrolyte is LiTFSI, the polymer is PEO, the plasticizer is DMC, and no The mass ratio of inorganic filler, lithium salt and polymer is 1:20, the mass ratio of plasticizer to polymer is 5:100; the inorganic electrolyte is lithium titanium aluminum phosphate. The mass ratio of organic electrolyte and inorganic electrolyte is 10:1.

[0078] (2) Mixing by wet mixing method, the above-mentioned graphite and organic-inorganic solid electrolyte are mixed in a kneading machine according to a weight ratio of 100:10, and tetrahydrofuran is selected as a solvent. After mixing, the solvent is heated to volatilize, and then mechanically pulverized to form an active material-electrolyte composite material.

[0079] (...

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Abstract

The invention discloses a preparation method of an electrode material, the corresponding electrode material, an electrode and a lithium ion battery. The preparation method comprises the following steps of mixing an electrode active substance with a solid electrolyte or a precursor of the solid electrolyte, and crushing to obtain a composite material; and mixing the composite material with a conductive agent. According to the preparation method, by firstly, mixing the electrode active substance with the solid electrolyte or the precursor of the solid electrolyte to enable the electrode active substance and the solid electrolyte or the precursor of the solid electrolyte to contact fully, the ionic conductivity of the electrode active substance is effectively improved, and then mixing the obtained composite material with the conductive agent to form a conductive network, the conductivity among the composite material particles is improved. The electrode material prepared by the method is clear in gradation and has higher ionic conductivity, so that an electrode and a lithium ion battery are prepared from the material, and the cycle performance of the lithium ion battery is improved.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a preparation method of an electrode material, the electrode material, an electrode and a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently the most widely used secondary batteries in commercialization, which have the advantages of high voltage, long cycle life, and high energy density. With the rise of mobile devices, electric vehicles, etc. in recent years, lithium-ion batteries have also received more attention. [0003] Traditional lithium-ion batteries use organic ester electrolytes and porous polymer separators. However, such electrolytes and porous polymer separators have considerable safety hazards. The ester electrolyte solvent itself is flammable and explosive, and the polymer separator is also easily penetrated to cause a short circuit of the battery. When the battery has an internal short circuit, or is impacted, or when the te...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/13H01M10/0525H01M10/058H01M10/42
CPCH01M4/364H01M4/13H01M10/058H01M10/0525H01M10/4235Y02E60/10Y02P70/50
Inventor 王晓霞
Owner SHENZHEN HYNETECH CO LTD
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