All-solid-state lithium battery composite positive electrode prepared based on melt permeation method and preparation method thereof

A composite positive electrode and all-solid-state technology, applied in battery electrodes, lithium batteries, non-aqueous electrolyte battery electrodes, etc., can solve the problems of high interface impedance of all-solid-state lithium batteries, poor solid-solid interface contact, etc., and achieve fast lithium ion channels , low equipment requirements and improved performance

Inactive Publication Date: 2021-09-24
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The first object of the present invention is to provide a composite positive electrode of an all-solid-state lithium battery in order to solve the problems of high interface impedance and poor solid-solid interface contact of the all-solid-state lithium battery;

Method used

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  • All-solid-state lithium battery composite positive electrode prepared based on melt permeation method and preparation method thereof
  • All-solid-state lithium battery composite positive electrode prepared based on melt permeation method and preparation method thereof

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specific Embodiment approach 1

[0028] An all-solid-state lithium battery composite positive electrode prepared based on a melt infiltration method, comprising a permeable layer 1, a positive electrode material layer 2 and a current collector layer 3, the positive electrode material layer 2 is attached to the current collector layer 3, and the permeable layer 1 is attached On the positive electrode material layer 2, and permeate in the positive electrode material layer 2, the permeation layer 1 includes high ion conductivity Li 1+x OHBr x , where x is greater than 0.

[0029] Further, the Li 1+x OHBr x The preparation method of LiBr and LiOH is weighed according to a certain proportion, and the two substances are mixed with organic solvent I as the dispersion medium to obtain a mixture, and the mixture is dried to obtain a precursor, and the precursor is carried out in a tube furnace under an inert atmosphere. Calcination treatment, after natural cooling to room temperature, Li 1+x OHBr x , where x is g...

specific Embodiment approach 2

[0038] A method for preparing an all-solid-state lithium battery composite positive electrode based on a melt infiltration method, comprising the following steps:

[0039] Step 1. Weigh LiBr and LiOH according to a certain ratio, use organic solvent I as the dispersion medium, and mix the two substances by ball milling to obtain a mixture, dry the mixture to obtain a precursor, and calcine the precursor in a tube furnace under an inert atmosphere After natural cooling to room temperature, the Li with anti-perovskite structure was obtained 1+x OHBr x , where x is greater than 0;

[0040] Step 2: Disperse the positive electrode active material, conductive agent, and binder in the organic solvent II according to a certain ratio to obtain the positive electrode slurry, apply the positive electrode slurry on the positive electrode current collector, dry, roll, punch, Obtain the positive pole piece;

[0041] Step 3, under nitrogen or an inert gas atmosphere, place the positive el...

Embodiment 1

[0053] A method for preparing an all-solid-state lithium battery composite positive electrode based on a melt infiltration method, comprising the following steps:

[0054] Step 1. According to the molar ratio of LiBr:LiOH=7:10, weigh LiBr and LiOH, use toluene as the dispersion medium for the two substances, and ball mill them for 15 hours at 500 rpm on a ball mill, and fully ball mill them to obtain a mixture. Vacuum drying at 120°C for 15 hours to obtain a precursor, which was calcined at 600°C for 20 hours in an inert atmosphere, and naturally cooled to room temperature to obtain Li with an antiperovskite structure 1.7 OHBr 0.7 ;

[0055] Step 2. Using LiNi 0.8 co 0.1 mn 0.1 o 2 It is the positive electrode active material, acetylene black is the conductive agent, PVDF is the binder and dispersed in NMP according to the mass ratio of 8:1:1 to obtain the positive electrode slurry, and the positive electrode slurry is coated on the positive electrode current collector, a...

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Abstract

The invention discloses an all-solid-state lithium battery composite positive electrode prepared based on a permeation method and a preparation method thereof, and relates to the technical field of all-solid-state lithium batteries. The all-solid-state lithium battery positive electrode is a composite positive electrode obtained based on a melt permeation method. According to the invention, Li1+xOHBrx with high ionic conductivity, which is obtained by calcination, is melted and permeated into pores of a positive pole piece under a heating condition, so that the composite positive pole is obtained. The composite positive electrode is compact and uniform in surface and extremely low in porosity, and can form a solid-solid interface with good contact with a solid electrolyte, so that the solid-solid contact area is increased, a stable and rapid lithium ion channel is provided, the interface resistance is reduced, and finally, the performance of the solid-state battery is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of all-solid-state lithium batteries, in particular to an all-solid-state lithium battery composite positive electrode prepared based on a melt infiltration method and a preparation method thereof. Background technique [0002] As the most mainstream electrochemical energy storage device today, lithium-ion batteries are not only widely used in portable electronic products, but also receive more and more attention in electric vehicles and new energy industries. However, traditional commercial lithium-ion batteries use organic liquids as electrolytes, which have problems such as flammability and corrosion, which have seriously restricted the development of lithium-ion batteries. In addition, during the battery cycle, the lithium dendrites generated by the uneven deposition of lithium metal on the negative electrode may pierce the separator, resulting in short circuit of the battery, electrolyte leakage and com...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/139H01M4/04H01M10/052H01M10/0525
CPCH01M4/13H01M4/139H01M4/0404H01M4/0476H01M10/052H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 娄帅锋孙业财王家钧马玉林尹鸽平
Owner HARBIN INST OF TECH
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