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Positive pole piece for solid-state battery, preparation method and application thereof

A technology for solid-state batteries and positive pole pieces, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problem of affecting the stability and uniformity of the coating layer, affecting the battery rate and cycle performance, and the difficulty of grasping the thickness of the coating layer To achieve high flexibility and practical value, improve rate performance and cycle performance, and reduce transmission impedance

Pending Publication Date: 2022-01-11
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN110400905A discloses a pole piece containing a solid electrolyte, including a pole piece body and a solid electrolyte coating coated on one side or both sides of the pole piece body, the thickness of the solid electrolyte coating is 5-20 μm The solid electrolyte coating includes the following raw materials, calculated in parts by weight, 0.5 to 2 parts of dispersant, 10 to 40 parts of solid electrolyte, 1 to 5 parts of binder, 50 to 100 parts of solvent A, and 50 to 100 parts of solvent B ; However, the control of the thickness of the coating layer is also difficult to grasp when coating the solid electrolyte coating of this document, thus affecting the stability and uniformity of the coating layer. At the same time, the method of slurry coating will also affect Battery rate and cycle performance

Method used

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  • Positive pole piece for solid-state battery, preparation method and application thereof
  • Positive pole piece for solid-state battery, preparation method and application thereof
  • Positive pole piece for solid-state battery, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0060] This embodiment provides a method for preparing a positive electrode sheet for a solid-state battery, and the preparation method is as follows:

[0061] (1) The sulfide solid electrolyte Li 6 P.S. 5 Cl is dissolved in absolute ethanol to obtain a sulfide solid electrolyte solution, and the viscosity of the solvent is controlled at 10cp;

[0062] (2) Atomize the sulfide solid electrolyte solution in step (1) by spraying method to make it adhere to the positive electrode active material LiNi 0.9 co 0.05 mn 0.05 o 2 At the same time, the solvent is dried to obtain a uniform and thin sulfide solid electrolyte coating layer on the surface of the positive electrode active material; the thickness of the corresponding coating layer is 50nm;

[0063] (3) Put the positive electrode active material coated with the sulfide solid electrolyte and the conductive carbon prepared above into the mixer, the mass ratio of the conductive carbon to the above-mentioned substance is 2:98,...

Embodiment 2

[0066] This embodiment provides a method for preparing a positive electrode sheet for a solid-state battery, and the preparation method is as follows:

[0067] (1) The halide solid electrolyte Li 3 InCl 6 Dissolve in pure water to obtain a halide solid electrolyte solution, and the viscosity of the solvent is controlled at 12cp;

[0068] (2) Atomize the halide solid electrolyte solution in step (1) by spraying method to make it adhere to the positive electrode active material LiNi 0.8 co 0.1 mn 0.1 o 2 At the same time, the solvent is dried to obtain a uniform and thin halide solid electrolyte coating layer on the surface of the positive electrode active material; the thickness of the corresponding coating layer is 100nm;

[0069] (3) Put the positive electrode active material and conductive carbon coated with the sulfide solid electrolyte prepared above into the mixer, the mass ratio of the conductive carbon to the above-mentioned substance is 3:97, and stir for 50min at...

Embodiment 3

[0071] The difference between this embodiment and Embodiment 1 is that the binder in step (3) of this embodiment is polyvinylidene fluoride.

[0072] All the other preparation methods and parameters are consistent with Example 1.

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Abstract

The invention provides a positive pole piece for a solid-state battery, a preparation method and application thereof. The preparation method comprises the following steps of: (1) atomizing a solid electrolyte solution, coating the surface of a positive active material with the atomized solid electrolyte solution, and then performing drying o obtain the positive active material coated with a solid electrolyte layer; and (2) carrying out primary mixing on the positive active material coated with the solid electrolyte layer and a conductive agent, then adding a binder, carrying out secondary mixing and rolling under the action of shear force to obtain a positive electrode layer, and then compounding the positive electrode layer with a current collector to obtain the positive pole piece for the solid-state battery. According to the invention, the surface of the positive active material is coated with the solid electrolyte solution, and then the positive pole piece is prepared by adopting a dry method, so that the contact between the solid electrolyte and an unstable solvent is avoided, the conductivity of the electrolyte is improved, and the rate capability and the cycle performance of the battery are improved.

Description

technical field [0001] The invention belongs to the technical field of solid-state batteries, and relates to a positive pole piece for a solid-state battery and a preparation method and application thereof, in particular to a positive pole piece for an all-solid-state battery and a preparation method and application thereof. Background technique [0002] Solid state batteries are a type of battery technology. The solid-state battery replaces the flammable organic liquid electrolyte with a non-flammable solid-state battery electrolyte, which greatly improves the safety of the battery system. At the same time, it can better adapt to high-energy positive and negative electrodes and reduce the weight of the system to achieve a simultaneous increase in energy density. Among all kinds of new battery systems, solid-state batteries are the next-generation technology closest to industrialization, which has become the consensus of the industry and the scientific community. [0003] A...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/131H01M10/0562H01M10/0525
CPCH01M4/1391H01M4/131H01M10/0562H01M10/0525H01M2004/028H01M2004/021Y02E60/10
Inventor 李瑞杰陈少杰王志文张琪王磊黄海强杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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