Preparation method for composite positive electrode material used for solid-state lithium ion battery

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of high cost, damage to the continuity of the electrode production line of liquid lithium-ion batteries, etc., and achieve high conductivity and high rate Good discharge performance and reduced equipment modification costs

Inactive Publication Date: 2017-08-04
NIO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also needs to add high-temperature sintering equipment to the traditional liquid lithium-ion electrode production line, and needs to modify the...

Method used

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  • Preparation method for composite positive electrode material used for solid-state lithium ion battery
  • Preparation method for composite positive electrode material used for solid-state lithium ion battery

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Experimental program
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Embodiment approach

[0050] According to one embodiment, a positive electrode for a solid-state lithium-ion battery is prepared as follows:

[0051] a) uniformly mixing the solid electrolyte or its precursor with the positive electrode active material or its precursor to obtain a mixture powder;

[0052] b) sintering the mixture powder at high temperature to obtain a composite positive electrode material comprising a solid electrolyte and a positive electrode active material in powder form; and

[0053] c) preparing the obtained composite positive electrode material into a positive electrode slurry, coating the obtained positive electrode slurry on the positive electrode substrate, drying, rolling, and cutting to obtain the positive electrode.

[0054] The cathode slurry is prepared by dissolving or dispersing composite cathode materials, conductive additives, and binders in a solvent.

[0055] In one embodiment, the positive electrode slurry is prepared as follows: the composite positive electro...

Embodiment 1

[0108] Selection of NASICON-type Li-ion conductors as solid electrolytes, LiCoO 2 As the positive electrode material, the solid electrolyte precursor powder (Li 2 CO 3 :Al(OH) 3 :GeO 2 :NH 4 h 2 PO 4 According to Li 1.52 Al 0.5 Ge 1.5 P 3 o 12.01 stoichiometric ratio) and LiCoO 2 powder. The mixed powder was ball milled with a planetary ball mill at a speed of 400r / min for 24 hours. Transfer the mixture powder after ball milling to Al 2 o 3 In the crucible, put the crucible into a muffle furnace, raise the temperature to 750°C at 5°C / min, and keep it at 750°C for 12h to obtain a composite cathode material powder with a particle size of 100nm.

[0109] According to composite cathode material: Super P:KS-6:PVDF=88:4:2:6 mass ratio composite cathode material, Super P, KS-6 and PVDF are mixed to obtain 10 grams of mixtures, and the mixture is dispersed in 5 grams of NMP , fully stirred evenly with a vacuum planetary mixer to obtain positive electrode slurry. The p...

Embodiment 2

[0113] Selection of NASICON-type Li-ion conductors as solid electrolytes, LiCoO 2 As the positive electrode material, the solid electrolyte Li 1.52 Al 0.5 Ge 1.5 P 3 o 12.01 and LiCoO 2 powder. The mixed powder was ball milled with a planetary ball mill at a speed of 400r / min for 24 hours. Transfer the mixed powder after ball milling to Al 2 o 3 In the crucible, put the crucible into a muffle furnace, raise the temperature to 750°C at 5°C / min, and keep it at 750°C for 12 hours to obtain a composite positive electrode material powder with a particle size of 90nm.

[0114] According to composite cathode material: Super P:KS-6:PVDF=88:4:2:6 mass ratio composite cathode material, Super P, KS-6 and PVDF are mixed to obtain 10 grams of mixtures, and the mixture is dispersed in 5 grams of NMP , fully stirred evenly with a vacuum planetary mixer to obtain positive electrode slurry. The positive electrode slurry was coated on an aluminum foil with a thickness of 18 μm, and th...

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Abstract

The invention relates to a preparation method for a composite positive electrode material used for a solid-state lithium ion battery. The preparation method comprises the following steps of i) performing uniform mixing on a solid-state electrolyte or a precursor thereof and a positive electrode active material or a precursor thereof to obtain mixture powder; and ii) performing high-temperature sintering on the mixture powder to obtain the powder-form composite positive electrode material which comprises the solid-state electrolyte and the positive electrode active material. By adoption of the preparation method for the composite positive electrode material provided by the invention, the interface resistance between the solid-state electrolyte and the positive electrode material can be lowered. When the composite positive electrode material, obtained by adopting the preparation method for the composite positive electrode material provided by the invention, is used for preparing the solid-state lithium ion battery, an electrode production line of the conventional liquid-state lithium ion battery can be not changed, so that equipment improvement cost used in improving the production line of the liquid-state lithium ion battery for preparation of the solid-state lithium ion battery can be greatly lowered.

Description

technical field [0001] The invention belongs to the field of battery technology. Specifically, the present invention relates to a method for preparing a cathode material for a lithium-ion battery, in particular to a method for preparing a composite anode material for a solid-state lithium-ion battery. Background technique [0002] Lithium-ion battery is a new type of rechargeable battery, which has the advantages of high voltage, high energy density, environmental protection and pollution-free, and is known as "the most promising chemical power source". As the low-carbon economy is in the ascendant, lithium-ion batteries are actively developing in the direction of vehicle power and grid energy storage. [0003] The power lithium-ion battery with traditional structure has the characteristics of high voltage, high energy density, and good cycle performance. It is widely used in portable digital products such as mobile phones, cameras, and notebook computers. The use of flamm...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/139H01M10/0525H01M10/058
CPCH01M4/139H01M4/364H01M10/0525H01M10/058Y02E60/10Y02P70/50
Inventor 马丽
Owner NIO CO LTD
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