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Solid-state lithium battery and production method thereof

A solid-state lithium and solid-state electrolyte technology, applied in the field of solid-state lithium batteries and their preparation, can solve the problems of liquid electrolyte reducing battery safety performance, battery energy density, etc., to improve safety performance and electrochemical performance, reduce production costs, The effect of simplifying the production process

Pending Publication Date: 2021-06-29
HUNAN LIFANG NEW ENERGY SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the objects of the present invention is to provide a solid lithium battery, which can solve the problem of using liquid electrolyte to reduce the safety performance of the battery, and can improve the chemical / electrochemical stability of the interface between the solid electrolyte and the electrode, avoiding the use of high The drop in battery energy density brought about by high-density solid-state electrolytes can also make use of existing manufacturing processes and equipment for liquid lithium-ion batteries

Method used

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  • Solid-state lithium battery and production method thereof

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preparation example Construction

[0047] 2. Preparation method of solid-state lithium battery

[0048] The second aspect of the present application is to provide a method for preparing a solid-state lithium battery, comprising the following steps:

[0049] 1) Mix lithium salt, organic solvent, initiator and acrylate monomer, and stir thoroughly to obtain a polymer gel electrolyte precursor;

[0050] 2) Mixing, mechanical fusion and heat treatment of the positive electrode active particles and NASICON oxide or metal chloride precursor to obtain the positive electrode active material, and coating the positive electrode active material on the positive electrode current collector to obtain the positive electrode sheet;

[0051] 3) mixing the ceramic particles and the binder, fully stirring and evenly coating the surface of the positive electrode or the negative electrode, and then vacuum-drying to obtain the positive electrode-ceramic solid electrolyte composite or the negative electrode-ceramic solid electrolyte ...

Embodiment 1

[0093] This embodiment provides a method for preparing a solid-state lithium battery, comprising the following steps:

[0094] 1) Lithium bistrifluoromethanesulfonylimide / lithium bisoxalate borate (molar ratio 4:1), fluorinated ethylene carbonate / ethyl methyl carbonate (volume ratio 1:1) organic solvent, azobisisobutyl Nitrile initiator (1% of monomer weight) and pentaerythritol triacrylate monomer are mixed, through fully stirring, obtain polymer gel electrolyte precursor, wherein bistrifluoromethanesulfonylimide lithium and bisoxalate lithium borate are relatively When the total molar concentration of fluorinated ethylene carbonate / ethyl methyl carbonate is 1mol / L, the weight ratio of organic solvent to monomer is 3:1;

[0095] 2) Li with a weight ratio of 4:100 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 The ceramic precursor is mixed with lithium cobalt oxide and subjected to mechanical fusion treatment to obtain a surface uniformly coated with Li 1.3 al 0.3 Ti 1.7 (PO 4 ) 3 The...

Embodiment 2

[0100] This embodiment provides a method for preparing a solid-state lithium battery, comprising the following steps:

[0101] 1) Lithium hexafluorophosphate / lithium bisoxalate borate (molar ratio 5:1), difluoroethylene carbonate / diethyl carbonate (volume ratio 1:1) organic solvent, azobisisobutyronitrile initiator (monomer weight 1%) mixed with pentaerythritol triacrylate monomer, through fully stirring, obtain polymer gel electrolyte precursor, wherein the total molar concentration of lithium hexafluorophosphate and bisoxalate lithium borate relative to difluoroethylene carbonate / diethyl carbonate is 1mol / L, the weight ratio of organic solvent to monomer is 4:1;

[0102] 2) Li with a weight ratio of 3:100 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 Ceramic precursors and LiNi 0.5 co 0.2 mn 0.3 o 2 Mixing, mechanical fusion treatment, the surface is uniformly coated with Li 1.4 al 0.4 Ti 1.6 (PO 4 ) 3 LiNi 0.5 co 0.2 mn 0.3 o 2 particles, and then heat-treated at 700 °C for...

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Abstract

The invention discloses a solid-state lithium battery and a production method thereof.The solid-state lithium battery comprises a positive plate, a negative plate and a solid-state electrolyte, and the solid-state electrolyte is arranged between the positive plate and the negative plate; a polymer gel electrolyte is also arranged in at least one of the inside of the negative plate, between the negative plate and the solid electrolyte, the inside of the solid electrolyte, between the solid electrolyte and the positive plate, and the inside of the positive plate; and the polymer gel electrolyte in the solid battery can inhibit an interface reaction between the solid electrolyte and the positive and negative electrodes, and also can improve the mechanical toughness of the solid electrolyte and reduce the interface internal resistance among ceramic particles. The battery design can effectively reduce the internal resistance of the solid-state lithium battery and improve the safety and electrochemical performance of the battery.

Description

technical field [0001] The invention relates to the field of novel solid-state batteries, in particular to a solid-state lithium battery and a preparation method thereof. Background technique [0002] Due to the depletion of fossil energy and increasingly serious environmental problems, the development of new energy vehicles is an inevitable trend, but to make new energy vehicles based on lithium batteries recognized, the requirements for their energy density are getting higher and higher. In recent years, with the promotion of high-nickel positive electrodes and silicon-carbon negative electrodes, the energy density of lithium-ion batteries has been greatly improved, but at the same time, they also face safety issues. [0003] Commercial lithium-ion batteries currently use carbonate-based organic liquid electrolytes, which are flammable and pose safety concerns. A fundamental way to solve the safety problem of lithium batteries is to use solid electrolytes, especially cera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0565H01M10/0525H01M10/42
CPCH01M10/0562H01M10/0565H01M10/0525H01M10/4235H01M2300/0071H01M2300/0082Y02E60/10
Inventor 徐雄文黄成涂健谢健
Owner HUNAN LIFANG NEW ENERGY SCI & TECH
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