Preparation method of solid state lithium battery composite cathode film

A composite cathode, solid lithium technology, applied in electrode manufacturing, battery electrodes, lithium batteries, etc., can solve problems such as the diffusion of sintered elements, reduce internal resistance, and increase the pores of the cathode film, and reduce the interface charge transfer resistance. The effect of improving interface densification and reducing interface impedance

Active Publication Date: 2019-06-07
ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
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Problems solved by technology

In order to solve this problem, the existing technical solutions are mainly: adding a sintering aid to reduce the heat treatment temperature; or coating the surface of the positive electrode with an ion-conducting material. The pores of the positive electrode film will become larger, which cannot reduce the internal resistance of the material very well.
Another example is the Chinese patent application (publication number: CN107017388A) which discloses a composite material for solid-state lithium-ion batteries. First, the solid electrolyte or its precursor is uniformly mixed with the positive electrode active material or its precursor to obtain a mixture powder, and then directly High-temperature sintering treatment is carried out first, and then mixed to form a slurry. It is simply coated with the composite positive electrode particles formed after sintering, and the composite positive electrode particles will be dispersed again, which cannot solve the problem of sintering itself. problems such as element diffusion, and the gaps in the positive electrode film formed by coating in this way will be larger. This kind of drying after coating will not form an interfacial transition layer, and the compactness is poor, which is not conducive to more effective The problem of reducing internal resistance

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  • Preparation method of solid state lithium battery composite cathode film
  • Preparation method of solid state lithium battery composite cathode film
  • Preparation method of solid state lithium battery composite cathode film

Examples

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Effect test

Embodiment 1

[0029] The active positive electrode particles nickel cobalt lithium manganate and LLZO solid electrolyte particles are mixed in proportion to form composite positive electrode powder particles, so that the particle diameters of the active positive electrode particles and LLZO solid electrolyte particles are both 100nm to 50μm, wherein the composite positive electrode powder particles The mass ratio of active positive electrode particles to LLZO solid electrolyte particles is 4:1, which is equivalent to 80wt% of positive electrode particles and 20wt% of LLZO solid electrolyte particles. A small amount of absolute ethanol, deionized Water or ethylene glycol, etc. The addition of the solvent here is mainly for the wetting effect and to improve the uniformity of the ball mill. Of course, it is also possible to mix the above raw materials without adding a solvent. The ball milling time is 5min~24h, and the ball milling temperature is 10 °C to 50 °C, after the ball milling is comple...

Embodiment 2

[0035] Mix the active positive electrode particles lithium cobaltate and LLZO solid electrolyte particles in proportion to form composite positive electrode powder particles, so that the particle diameters of the active positive electrode particles and LLZO solid electrolyte particles are both 200nm to 250nm, and the LLZO solid electrolyte particles are garnet-structured A ceramic material, wherein the mass ratio of the active positive electrode particles to the LLZO solid electrolyte particles in the composite positive electrode powder particles is 6.5:3.5, which is equivalent to 65 wt% of the positive electrode particles and 35 wt% of the LLZO solid electrolyte particles, A small amount of absolute ethanol, deionized water or ethylene glycol can be added, and the above-mentioned raw materials are mixed evenly by ball milling. The ball milling time is 1.0h, and the ball milling temperature is 25°C-30°C. After the ball milling is completed, the mixture is dried to obtain Compos...

Embodiment 3

[0041] The active positive electrode particles spinel lithium nickel manganese oxide and Ta-doped LLZO solid electrolyte particles are mixed in proportion to form composite positive electrode powder particles. The LLZO solid electrolyte particles are ceramic materials with a garnet structure. The Ta element in each mole of LLZO solid electrolyte The number of moles incorporated is 0.02 to 0.8, so that the particle diameters of the active positive electrode particles and the Ta-doped LLZO solid electrolyte particles are both 150nm to 200nm, wherein the active positive electrode particles in the composite positive electrode powder particles and the Ta-doped LLZO solid electrolyte particles The mass ratio of particles is 7:3, which is equivalent to 70wt% of positive electrode particles and 30wt% of LLZO solid electrolyte particles. A small amount of absolute ethanol, deionized water or ethylene glycol can be added to The above raw materials are mixed evenly by ball milling, the ba...

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Abstract

The present invention relates to a preparation method of a solid state lithium battery composite cathode film, belonging to the technical field of battery cathode materials. In order to solve the problems that sintering aids are required being added and the internal resistance of the interface is high in the prior art, the present invention provides a preparation method of a solid state lithium battery composite cathode film. The method comprises the steps of: performing uniform mixing and ball milling of active cathode particles and LLZO solid electrolyte particles in proportion, then dryingthe mixture to obtain composite cathode powder body particles, wherein the mass content of the LLZO solid electrolyte particles in the composite cathode powder body particles is 5.0-35wt%; mixing thecomposite cathode particles, a binder, adhesives, a dispersing agent, a plasticizer and a solvent to form a composite cathode slurry; and performing tape casting of the composite cathode slurry to prepare a composite cathode blank film, performing drying and rubber discharging of the composite cathode blank film, and performing low-temperature sintering processing at a temperature of 650-850 DEG Cto obtain a composite cathode film. The preparation method of the solid state lithium battery composite cathode film can effectively improve the interface densification, can reduce the interface impedance and can reduce the interface charge transfer resistance.

Description

technical field [0001] The invention relates to a method for preparing a composite cathode film of a solid-state lithium battery, belonging to the technical field of battery cathode materials. Background technique [0002] The rapid development of electric vehicles has put forward higher requirements for battery technology, and high energy density and high safety have become the common goals of the development of various power batteries. The most widely used power battery is based on the liquid lithium-ion battery system, which uses liquid organic electrolytes and various anode and cathode materials to achieve different energy densities and safety characteristics. Among the existing various liquid lithium-ion battery systems, the battery system using lithium iron phosphate material as the positive electrode has high safety and cycle characteristics, but the energy density of this system is not high, and the energy density of a single battery is difficult to reach 200Wh / Mor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M4/1391H01M4/04H01M10/052
CPCY02E60/10
Inventor 郑浩李晓青
Owner ZHEJIANG FOREVER NEW ENERGY TECH CO LTD
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