Positive electrode material with low internal resistance for solid state lithium battery and preparation method of positive electrode material

A technology of cathode materials and cathode active materials, applied in the field of lithium-ion battery preparation, can solve problems such as difficulty in achieving uniform coating of lithium conductive oxides and carbon materials, destruction of lithium ion and electron transport channels, lack of flexibility, etc.

Inactive Publication Date: 2018-06-29
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different thermal expansion coefficients between the active material and the lithium conductive oxide and carbon material, there is a possibility that the carbon-containing and lithium conductive oxide coating layer cannot grow closely on the surface of the active material particle during the heat treatment process. It will reduce the contact area between the active material and the coating layer material and increase the interfacial resistance
Especially for positive electrode active material particles with irregular particle shape, it is difficult to achieve uniform coating of lithium conductive oxides and carbon materials on the corners and edges of positive electrode active material particles by the above coating method
Moreover, the carbon-containing and lithium conductive oxides formed on the surface of the active material particles after heat treatment do not possess flexibility, and are difficult to adapt to the volume deformation of the positive active material during repeated charging and discharging, and are easy to peel off and fall off from the surface of the positive active material particles, Destroy the lithium ion and electron transport channels of the positive electrode active material, increase the internal resistance of the battery, and reduce the performance of the battery

Method used

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  • Positive electrode material with low internal resistance for solid state lithium battery and preparation method of positive electrode material
  • Positive electrode material with low internal resistance for solid state lithium battery and preparation method of positive electrode material
  • Positive electrode material with low internal resistance for solid state lithium battery and preparation method of positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0040] First, add 1.0 g of carbon nanotubes and 80.0 g of lithium cobaltate powder into 20 ml of N,N-dimethylformamide and stir evenly, then add 5.0 g of (p-vinylbenzenesulfonyl) trifluoromethanesulfonimide Stir lithium and 5.5 g maleic anhydride evenly, then add 0.02 g azobisisobutyronitrile, in situ polymerization at 70 °C for 20 h, and wash with tetrahydrofuran to obtain carbon nanotubes and poly((paraethylene phenylsulfonyl) trifluoromethanesulfonimide lithium-maleic anhydride) composite material coated lithium cobalt oxide cathode material, wherein the thickness of the surface composite material layer is about 10 nm.

[0041] Using the lithium cobaltate positive electrode material coated with carbon nanotubes and poly((p-vinylbenzenesulfonyl)trifluoromethanesulfonimide lithium-maleic anhydride) composite material prepared in this example, according to the positive electrode material: poly The mass ratio of vinylidene fluoride = 90:10 is used to prepare the positive electr...

Embodiment 2

[0043] First, add 0.5 g of carbon nanofibers and 50.0 g of lithium iron borate powder into 20 ml of N,N-dimethylformamide and stir well, then add 2.0 g of (p-vinylbenzenesulfonyl) trifluoromethanesulfonimide Stir lithium and 2.1 g methyl acrylate evenly, then add 0.02 g azobisisobutyronitrile, complete polymerization at 60 °C, and wash with tetrahydrofuran to obtain carbon nanofibers and poly((p-vinylbenzenesulfonyl) Lithium iron borate cathode material covered by in-situ polymerization of trifluoromethanesulfonyl imide-methyl acrylate) composite material, in which the thickness of the surface composite material layer is about 25 nm.

Embodiment 3

[0045] First, add 0.5 g of graphite, 20.0 g of lithium cobaltate, and 30.0 g of nickel-cobalt-lithium manganese oxide powder into 50 ml of acetonitrile and stir evenly, then add 1.0 g of polymethylhydrogensiloxane, 2.0 g of (2-methoxyethoxy Base) ethylene and 1.5 g (p-vinylbenzenesulfonyl) lithium trifluoromethanesulfonimide were stirred evenly, then 0.05 g benzoyl peroxide was added, and the polymerization reaction was completed at 80 °C, washed with n-hexane, and then Lithium cobalt oxide and lithium nickel cobalt lithium manganese oxide cathode materials coated with graphite and functionalized poly(methylsiloxane) composite materials in situ were obtained, wherein the thickness of the surface composite material layer was about 15 nm.

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Abstract

The invention provides a positive electrode material with low internal resistance and particularly relates to a positive electrode material with low internal resistance for a solid state lithium battery and a preparation method of the positive electrode material. The positive electrode material with low internal resistance is prepared from a positive electrode active material core and a surface composite material layer covering the positive electrode active material core, wherein the surface composite material layer is mainly prepared from a nano long-range conducting material and a single ionconductor polymer material. The positive electrode material with low internal resistance, provided by the invention, has higher electronic conductivity and lithium ion conductivity and can effectively reduce the internal resistance of the solid state lithium battery; because the positive electrode active material core and the surface composite material layer have strong interaction, the phenomenaof granule cracking and grinding caused by volume deformation of the positive electrode active material core in repeated charging and discharging process can be effectively inhibited so as to ensurethe structural integrity of the positive electrode active material core and good interface stability; and furthermore, the technical scheme provided by the invention is simple and easy, low in production cost and suitable for performing large-scale production.

Description

technical field [0001] The invention relates to the technical field of preparation of lithium ion batteries, in particular to a positive electrode material of a solid lithium battery and a preparation method of the positive electrode material. Background technique [0002] Lithium-ion batteries have become a research hotspot in the fields of portable electronics, power tools and electric vehicles due to their high energy density. However, the continuous intelligence of portable electronic products will greatly increase the power consumption of lithium-ion batteries. Therefore, the low energy density of batteries becomes the main factor affecting the length of standby time. On the other hand, the demand for cruising range and safety of electric vehicles also puts forward new requirements for existing commodity lithium-ion batteries. Therefore, in recent years, countries around the world have actively deployed and developed solid-state lithium battery technology that takes in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/62H01M10/0525
CPCH01M4/366H01M4/624H01M4/625H01M4/626H01M10/0525Y02E60/10
Inventor 崔光磊马君张建军张焕瑞徐红霞
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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