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All-solid-state lithium ion battery composite positive electrode and preparation method thereof

A lithium-ion battery and composite positive electrode technology, which is applied in electrode manufacturing, battery electrodes, positive electrodes, etc., can solve the problems of inability to fully utilize the transmission of lithium ions, poor contact effect of inorganic solid electrolytes and positive electrode materials, etc., and achieve improved electrical conductivity. Low cost, convenient for large-scale industrial production, and simple operation

Inactive Publication Date: 2021-02-02
SAIC MOTOR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can improve the transport capacity of lithium ions in the positive electrode to a certain extent, the contact effect between the inorganic solid electrolyte and the positive electrode material is poor, and its ability to transport lithium ions cannot be fully utilized.

Method used

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  • All-solid-state lithium ion battery composite positive electrode and preparation method thereof
  • All-solid-state lithium ion battery composite positive electrode and preparation method thereof
  • All-solid-state lithium ion battery composite positive electrode and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The positive electrode material lithium iron phosphate, the inorganic solid electrolyte LAGP, the conductive agent carbon black and the binder polyvinyl alcohol are ball milled for 4 hours according to the mass ratio of 90%:5%:2%:3% to prepare mixed powder.

[0039] Using supersonic plasma spraying equipment, under the conditions of 500 ° C and 2 MPa, using argon as a protective gas, spraying on the surface of the current collector aluminum foil to obtain a composite positive electrode material with a thickness of 50 μm.

[0040] The photo of the composite cathode material prepared in Example 1 of the present invention is as follows figure 1 shown by figure 1 It can be seen that the method provided in Example 1 of the present invention can obtain a stable positive electrode sheet without powder dropping or falling off.

[0041] The XRD diffraction test was carried out on the composite positive electrode material prepared in Example 1 of the present invention. The test ...

Embodiment 2

[0044] The mixed powder is prepared by using the ternary material nickel cobalt lithium manganese oxide, inorganic solid electrolyte LATP, conductive agent carbon black and binder polytetrafluoroethylene according to the mass ratio of 90%: 4%: 4%: 2% by ball milling for 6 hours .

[0045] Using supersonic cold spraying equipment, under the conditions of 300 ° C and 1 MPa, nitrogen is used as a protective gas to spray on the surface of the current collector aluminum foil to obtain a composite positive electrode material with a thickness of 110 μm.

[0046] According to the method described in Example 1, the composite positive electrode material prepared in Example 2 of the present invention is detected, and the XRD diffraction results are as follows figure 2 As shown, the test results show that the positive pole piece adheres stably without falling powder or falling off; the crystal structure of the material is consistent with that of nickel-cobalt lithium manganese oxide, and...

Embodiment 3

[0048] The positive electrode material lithium cobaltate, inorganic solid electrolyte LLZO, conductive agent carbon black and carbon nanotubes (mass ratio 2:1) and binder polytetrafluoroethylene are ball milled according to the mass ratio of 92%: 3%: 2%: 3%. 8h prepared into a mixed powder.

[0049] Using supersonic cold spraying equipment, under the conditions of 350 ° C and 1.5 MPa, using argon as a protective gas, spraying on the surface of the current collector aluminum foil to obtain a composite positive electrode material with a thickness of 75 μm.

[0050] According to the method described in Example 1, the composite positive electrode material prepared in Example 3 of the present invention was tested, and the test results showed that the positive electrode sheet adhered stably without falling powder or falling off; the crystal structure of the material was consistent with that of lithium cobaltate and did not change. , The capacity of the active material of the positiv...

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Abstract

The invention provides a preparation method of an all-solid-state lithium ion battery composite positive electrode. The preparation method comprises the following steps of: mixing a positive electrodematerial, an inorganic solid electrolyte, a conductive agent and a binder to obtain a mixture; spraying the mixture on the surface of a base material to obtain a composite positive electrode, the temperature in the spraying process ranging from 100 DEG C to 500 DEG C; the pressure in the spraying process being 0.5-2MPa. According to the method provided by the invention, certain kinetic energy exists between the positive electrode material particles and the inorganic solid electrolyte particles in the spraying process, and under the conditions of high temperature and high pressure, the two kinds of particles contact with each other to cause micro-fusion of a contact area, so that the particles are better bonded together. When the mixed powder is rapidly sprayed on the base material, the positive electrode material and the inorganic solid electrolyte are in full contact, so that the generation of physical intervals is effectively avoided, and therefore, lithium ions can be fully transmitted, and the problem that the conductivity of positive electrode lithium ions in an all-solid-state battery is relatively low is solved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an all-solid-state lithium-ion battery composite positive electrode and a preparation method thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high capacity density, good cycle performance and safety performance, and environmental friendliness, and are widely used in portable electronic products, electric vehicles, and energy storage fields. At present, commercial lithium-ion batteries use organic carbonates as electrolytes. Due to the instability of organic electrolytes during the cycle, decomposition reactions are prone to occur, resulting in abnormal conditions such as battery overcharge, internal short circuit, and gas production. May cause spontaneous combustion or explosion hazard. The use of solid electrolytes instead of liquid electrolytes can avoid the side effects of liquid e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/1397H01M4/04H01M4/131H01M4/136H01M10/0562H01M10/0525
CPCH01M4/0404H01M4/131H01M4/136H01M4/1391H01M4/1397H01M10/0525H01M10/0562H01M2004/028Y02E60/10
Inventor 侯进森冯奇朱冠楠薛龙龙黄馗孙亮
Owner SAIC MOTOR
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