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Solid-state lithium battery

A solid-state lithium and solid-state electrolyte technology, applied in batteries, battery electrodes, secondary batteries, etc., can solve problems such as poor contact between electrodes and electrolyte interfaces, low conductivity, etc., and achieve improved solid-state battery performance, stable interface, and cycle stability and the effect of improving the rate performance

Inactive Publication Date: 2021-04-30
BEIJING ELECTRIC VEHICLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Solid electrolytes have a higher potential stability window, higher mobility, and are safer due to their reduced flammability and increased mechanical stability, but they may suffer from low electrical conductivity and poor interfacial contact between electrodes and electrolyte The impact of other issues

Method used

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Examples

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Effect test

Embodiment 1

[0087] Co-precipitation and solid-state sintering method to prepare nickel-cobalt-lithium manganese oxide ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0088] Preparation of COF-300 by solvothermal method: Weigh tetraaminetetraphenylmethane and terephthalaldehyde into a polytetrafluoroethylene-lined autoclave, inject dried anhydrous dioxane and 3M acetic acid aqueous solution, and make After the solid powder was completely dissolved, it was placed in a 120°C drying oven to react for 3 days. After the reaction, the yellow powder obtained was filtered, washed repeatedly with anhydrous dioxane and anhydrous tetrahydrofuran, activated with anhydrous tetrahydrofuran, and dried in vacuum to obtain COF- 300 powder.

[0089] Combining COF-300 with LiNi 0.5 co 0.2 mn 0.3 o 2 Add it to the ball mill tank, add the small and medium balls with a mass ratio of 0.5:1 to the nickel-cobalt lithium manganate ternary material, the mass ratio of the small and medium balls is 1:1, and mi...

Embodiment 2

[0093] Co-precipitation and solid-state sintering method to prepare nickel-cobalt-lithium manganese oxide ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 . Preparation of PZ-COF-1 powder by solvothermal method: 1,2,4,5-tetraaminobenzene (110.0mg, 1.0mmol) and hexahydroxytriphenylene (108.0mg, 1.0mmol) were placed in polytetrafluoroethylene Into a lined autoclave, inject 5 mL of acetic acid, and then add potassium dichromate (100.0 mg, 0.3 mmol) to completely dissolve the solid powder. Then the reaction kettle was placed in a drying oven at 120° C. for 3 days to react, and a black suspension was obtained after the reaction was completed.

[0094] Among them, acetic acid is used as a catalyst to promote the dehydration reaction of the first step, and potassium dichromate is used as an oxidant for the second step oxidation reaction.

[0095] The obtained black suspension was filtered, and the obtained precipitate was repeatedly washed with tetrahydrofuran. After vacuum drying, ...

Embodiment 3

[0100] Co-precipitation and solid-state sintering method to prepare nickel-cobalt-lithium manganese oxide ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 .

[0101] COF-5 powder was prepared by solvothermal method: 1,4-benzenediboronic acid (BDBA; 185mg, 1.116mmol) and 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP; 241.5mg, 0.745mmol ) into a polytetrafluoroethylene-lined reaction kettle, inject 20mL of a 1:1 volume solution of 1,3,5-trimethylbenzene and 1,4-dioxane to completely dissolve the solid powder. Then the reaction kettle was placed in a drying oven at 100° C. for 3 days.

[0102] The obtained suspension was filtered, and the obtained precipitate was repeatedly washed with acetone. After vacuum drying, COF-5 powder is obtained, which is a boron-containing COFs material.

[0103] Combine the prepared COF-5 powder with LiNi 0.5 co 0.2 mn 0.3 o 2 Add it to the ball mill tank, add the small and medium balls with a mass ratio of 0.5:1 to the nickel-cobalt lithium manga...

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Abstract

The invention relates to the technical field of lithium batteries, and especially relates to a solid-state lithium battery. The solid-state lithium battery comprises a positive electrode, a negative electrode and a solid-state electrolyte, and the solid-state electrolyte is an organic porous material; the material of the positive electrode is a nickel cobalt lithium manganate ternary material of which the surface is coated with the organic porous material or the derivative thereof; and the organic porous material is a covalent organic framework material, a conjugated microporous polymer or a porous aromatic framework material. The nickel cobalt lithium manganate ternary material with the surface coated with the organic porous material or the derivative thereof is used as the positive electrode, the organic porous material is used as the solid electrolyte, and the two materials are combined to effectively enhance the interface contact between the electrode and the electrolyte, eliminate the side reaction, stabilize the interface and improve the performance of the solid-state battery. For example, the cycling stability and the rate capability are improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a solid-state lithium battery. Background technique [0002] As the only energy source of pure electric vehicles, the power battery directly affects the performance of the whole vehicle. Lithium-ion batteries have become a hot spot in the research of new power supply technology due to their advantages such as high specific energy, long cycle life, no memory effect, safety and reliability, and fast charging and discharging. [0003] Traditional liquid lithium-ion batteries have safety problems such as poor thermal stability, flammability, and easy leakage. The use of solid electrolytes instead of liquid electrolytes is an effective way to solve the above problems. [0004] Solid electrolytes have a higher potential stability window, higher mobility, and are safer due to their reduced flammability and increased mechanical stability, but they may suffer from low electric...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525H01M10/0565
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/625H01M4/628H01M10/0525H01M10/0565H01M2220/20H01M2300/0065Y02E60/10
Inventor 张鹏赖兴强王睿
Owner BEIJING ELECTRIC VEHICLE
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