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Solid-state lithium ion battery applying composite positive electrode as well as assembly method and application thereof

A lithium-ion battery, composite cathode technology, applied in secondary batteries, battery electrodes, battery assembly machines, etc., can solve the problems of low load of electrode active materials, volume changes of electrode materials, poor cycle stability, etc., to improve energy density, The effect of high energy density and high stability

Pending Publication Date: 2020-06-02
SUN YAT SEN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the development of solid-state batteries with superior performance still faces many scientific and technical challenges: for example, the volume change of electrode materials, large interface (electrode / electrolyte) resistance, low loading of electrode active materials, poor cycle stability, and low safety performance, etc.

Method used

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  • Solid-state lithium ion battery applying composite positive electrode as well as assembly method and application thereof
  • Solid-state lithium ion battery applying composite positive electrode as well as assembly method and application thereof
  • Solid-state lithium ion battery applying composite positive electrode as well as assembly method and application thereof

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Embodiment 1

[0031] The present invention uses a sol-gel method to prepare a garnet-type solid electrolyte, preferably using anhydrous lithium nitrate, lanthanum nitrate hexahydrate, and zirconium acetylacetonate as metal sources for preparing LLZO. According to Li 7 Al 0.2 La 3 Zr 2 o 12 Weigh anhydrous lithium nitrate (excess 10% to 20%), lanthanum nitrate hexahydrate, zirconium acetylacetonate, add a small amount of aluminum nitrate, dissolve in water to prepare a solution and stir evenly with a magnetic stirrer. Dissolve the complexing agent citric acid in water and stir evenly with a magnetic force, and add a few drops of nitric acid to the citric acid solution. Add the complexing agent dropwise to the mixed liquid, heat and evaporate the solvent after the reaction is complete, the evaporation temperature is generally slightly lower than the boiling point of the solvent, so the evaporation temperature is preferably 80°C. As the solvent evaporated, a dark gel was obtained. The re...

Embodiment 2

[0033] The morphology and particle size distribution of the solid electrolyte material were observed under a scanning electron microscope. figure 2 The experimental results given show that the particle size distribution is uniform, and the particles are finer than the solid-phase method.

Embodiment 3

[0035] Mix and grind the solid electrolyte and binder evenly, add an appropriate amount of NMP solvent to disperse the solid electrolyte and binder uniformly, and then perform ultrasonic treatment. Drop the dispersion liquid on the positive electrode sheet, apply the dispersion liquid evenly on the surface of the positive electrode by the scraper film forming method to form a uniform coating, and then the composite positive electrode can be obtained, and then put it in a blast drying oven to dry spare. Using metal lithium as the negative electrode, compared with the liquid lithium-ion battery, reduces the interface between the positive electrode and the diaphragm, and assembles the button battery. image 3 A schematic diagram of the overall structure of the solid-state battery is given.

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Abstract

The invention discloses a solid-state lithium ion battery applying a composite positive electrode as well as an assembly method and application of the solid-state lithium ion battery. The assembly method comprises the steps of (1) mixing an electrode material, a binder and a conductive additive, and uniformly grinding, then adding the mixture into an N-methyl pyrrolidone solvent, fully grinding and uniformly mixing, coating a current collector aluminum foil with the mixture, and drying to obtain a positive pole piece; (2) mixing and grinding the solid electrolyte powder and a binder, adding the mixture into an NMP solvent, performing wet grinding, and performing ultrasonic dispersion to obtain a uniformly dispersed solid electrolyte dispersion liquid; coating the dispersion liquid of the solid electrolyte on the surface of the positive pole piece, forming a solid electrolyte coating on the surface of the positive pole piece by using a scraper film forming method, and completely dryingto obtain a composite positive pole piece; and (3) taking the composite positive pole piece as a positive electrode in the solid-state battery, taking a metal negative electrode material as a negativeelectrode, activating the interface, packaging in a button battery shell, and pressurizing and sealing to obtain the solid-state battery.

Description

technical field [0001] The invention relates to the field of lithium batteries, in particular to a solid-state lithium ion battery using a composite positive electrode and an assembly method and application thereof. Background technique [0002] Lithium-ion batteries are one of the key components of the portable, entertainment, computing and telecommunications devices demanded in today's society. At the same time, with the development of electronic products, electric vehicles, and new energy industries, higher requirements are put forward for the energy density, long cycle performance, and safety of lithium-ion batteries. Lithium secondary batteries based on liquid electrolytes cannot carry higher energy density due to electrochemical stability, thermal stability, safety and other reasons, and there are certain safety hazards. Solid-state lithium-ion batteries using solid-state electrolytes can effectively overcome many of the above-mentioned shortcomings, and have great ad...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/04H01M10/0525H01M10/0562
CPCH01M10/0404H01M4/0407H01M4/13H01M10/0525H01M4/139H01M10/0562Y02E60/10Y02P70/50
Inventor 卢侠韩百川廖兴群梁东建
Owner SUN YAT SEN UNIV
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