Positive electrode composite material of lithium ion battery and all-solid-state battery containing the same

A lithium-ion battery, all-solid-state battery technology, applied in battery electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of poor interface compatibility, low ionic conductivity, and high battery preparation costs, reducing direct contact, improving Interface problems, the effect of enhancing ionic conductivity

Inactive Publication Date: 2019-03-08
江西中汽瑞华新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a lithium-ion battery positive electrode composite material and an all-solid-state battery containing the positive electrode composite material. The positive electrode composite material has a core-shell structure, the positive electrode active material is the core, and the solid electrolyte coated on its surface is the shell Layer, this core-shell structure can reduce the direct contact between the positive electrode active material and the solid electrolyte, thereby improving the interface problem between the positive electrode and the solid electrolyte. In addition, the solid electrolyte of the shell layer can also enhance the ionic conductivity of the material and solve the problem of Solve the problems of low ion conductivity of existing solid electrolytes, high interfacial impedance between solid electrolytes / electrodes, poor interfacial compatibility, and high cost of battery preparation at this stage

Method used

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  • Positive electrode composite material of lithium ion battery and all-solid-state battery containing the same
  • Positive electrode composite material of lithium ion battery and all-solid-state battery containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation process of the all-solid-state battery is as follows:

[0037] The first step, the preparation of the cathode composite material: according to 3LiBH 4 -LiI and lithium nickel cobalt manganese oxide 523 mass ratio is 5:100 and weighed, the 3LiBH 4 -LiI is dissolved in N-methylpyrrolidone. After it is completely dissolved, add nickel-cobalt lithium manganese oxide 523, stir evenly in a high-speed disperser, and then put it in a vacuum drying oven to dry until the solvent is completely evaporated. Under the atmosphere at 500°C, calcined for 6 hours, and cooled with the furnace to obtain a positive electrode composite material with a core-shell structure.

[0038] The second step, the preparation of the positive electrode sheet: weigh the positive electrode composite material obtained in the first step, acetylene black, and polyvinylidene fluoride in a mass ratio of 94:3:3, and then add polyvinylidene fluoride to the N-methyl Disperse in pyrrolidone. After...

Embodiment 2

[0043] The first step, the preparation of the cathode composite material: according to 3LiBH 4 -LiI and LiCoO 2 The mass ratio is 8:100, and the 3LiBH 4 -LiI is dissolved in THF, after complete dissolution, add LiCoO 2 , stirred evenly in a high-speed disperser, put it into a vacuum drying oven to dry until the solvent is completely evaporated, and calcined the obtained solid powder at 500°C for 12 hours in an argon atmosphere, and cooled with the furnace to obtain a positive electrode composite material with a core-shell structure;

[0044] The second step, the preparation of the positive electrode sheet: the positive electrode composite material obtained in the first step, Ketjen black, and polytetrafluoroethylene are weighed in a mass ratio of 92:5:3, and then the polytetrafluoroethylene is added to the N-formaldehyde After the dispersion is complete, add Ketjen black and positive electrode composite material in turn, stir evenly, adjust the slurry viscosity to 8000cps, c...

Embodiment 3

[0049] The first step, the preparation of the cathode composite material: according to 3LiBH 4 -LiI and LiFePO 4 The mass ratio is 15:100, and the 3LiBH 4 -LiI is dissolved in THF, after complete dissolution, add LiFePO 4 , stirred evenly in a high-speed disperser, then put it into a vacuum drying oven to dry until the solvent evaporates completely, calcined the obtained solid powder at 800 ° C for 1 hour in a nitrogen atmosphere, and cooled with the furnace to obtain a positive electrode composite material with a core-shell structure;

[0050] The second step, the preparation of the positive electrode sheet: the positive electrode composite material prepared in the first step, Ketjen black, and polytetrafluoroethylene are weighed in a mass ratio of 92:5:3, and then the polytetrafluoroethylene is added to the N-formaldehyde After the dispersion is complete, add Ketjen black and positive electrode composite material in turn, stir evenly, adjust the slurry viscosity to 8500cps...

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Abstract

The invention discloses a positive electrode composite material of a lithium ion battery. The specific preparation method of the material is as follows: step 1: weighing an appropriate amount of solidelectrolyte and dissolving into an organic solvent, adding an appropriate amount of positive electrode material to the above solution, stirring uniformly in a high-speed dispersion machine, then putting into a vacuum drying oven and drying till the solvent is volatilized completely; and step 2: calcining the obtained solid powder in an atmosphere of an inert gas for a certain time, and cooling with a furnace to obtain the positive electrode material having a core-shell structure. The positive electrode composite material prepared by the invention is provided with the core-shell structure, a positive electrode active material is taken as a core, and the solid electrolyte coated on a surface of the positive electrode active material is a shell layer; with such a core-shell structure, the direct contact between the positive electrode active material and the solid electrolyte can be reduced, and thus the interface problem between a positive electrode and the solid electrolyte is improved;and in addition, the solid electrolyte of the shell layer can further reinforce the ionic conductivity of the material.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery preparation, and relates to a lithium-ion battery cathode composite material and an all-solid-state battery containing the cathode composite material. Background technique [0002] At present, commercial lithium batteries use organic liquid electrolytes. The electrolyte and electrode materials are prone to side reactions during charging and discharging, resulting in irreversible decline in battery capacity. At the same time, during the long-term service of the battery, the organic liquid electrolyte will volatilize and dry up. , leakage and other phenomena will affect the battery life. On the other hand, traditional lithium batteries cannot use metal lithium with high energy density as the negative electrode material. During the battery cycle, due to factors such as the surface current density of metal lithium and the uneven distribution of lithium ions, the repeated dissolution and deposition o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/04H01M10/0562H01M10/0525
CPCH01M4/0402H01M4/362H01M10/0525H01M10/0562Y02E60/10
Inventor 陈伟王海文范进雷张小溪
Owner 江西中汽瑞华新能源科技有限公司
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