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A preparation method of an all-solid electrolyte for a lithium battery and the prepared all-solid electrolyte

An electrolyte, all-solid-state technology, used in solid electrolytes, non-aqueous electrolyte batteries, lithium batteries, etc., can solve problems such as poor cycle performance, achieve good mechanical properties and thermal stability, improved electrochemical stability, and good mechanical tension. The effect of elongation and thermal stability

Active Publication Date: 2022-05-20
ANQING NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium battery all-solid-state electrolyte in the prior art has the problem of poor cycle performance.

Method used

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  • A preparation method of an all-solid electrolyte for a lithium battery and the prepared all-solid electrolyte
  • A preparation method of an all-solid electrolyte for a lithium battery and the prepared all-solid electrolyte
  • A preparation method of an all-solid electrolyte for a lithium battery and the prepared all-solid electrolyte

Examples

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Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing an all-solid-state electrolyte for a lithium battery, comprising the following steps:

[0036] (1) In an inert atmosphere and anhydrous environment, mix 1,3-dioxolane (DOL) and 1,2-dimethoxyethane (DME) at a volume ratio of 1:1, Stir well;

[0037] (2) In an inert atmosphere and anhydrous environment, add 15wt% thermoplastic polyurethane (TPU) particles (purchased from BASF, Germany, density 1-1.3g cm -3 ) into the mixed solution of step (1), stirring at 25°C until the TPU particles are completely dissolved;

[0038] (3) In an inert atmosphere and anhydrous environment, mix 1-4mol L -1 Add the lithium bisfluorosulfonyl imide (LiFSI) with the highest concentration to the mixed solution in step (2), stir and mix evenly at 25°C, pack it into a mold that can be sealed according to actual needs, and let it stand at room temperature. Lithium salt The in-situ polymerization time is different for different concentrations, and the all-solid-state lithiu...

Embodiment 2

[0042] A method for preparing an all-solid-state electrolyte for a lithium battery, comprising the following steps:

[0043] (1) In an inert atmosphere and anhydrous environment, mix 1,3-dioxolane (DOL) and 1,2-dimethoxyethane (DME) at a volume ratio of 1:1, Stir well;

[0044] (2) In an inert atmosphere and anhydrous environment, add 15wt% thermoplastic polyurethane (TPU) particles to the mixed solution in step (1), and stir at 25°C until the TPU particles are completely dissolved;

[0045] (3) In an inert atmosphere and anhydrous environment, 0.1mol L-1 Lithium hexafluorophosphate (LiPF 6 ) Electrolyte lithium salt is added to the mixed solution in step (2), stirred and mixed evenly at 25°C, and packed into sealable molds according to actual needs. After in-situ polymerization is complete, a new type of all-solid-state lithium battery electrolyte non-porous transparent film is formed. .

[0046] Prepared LiPF 6 The decomposition potential and room temperature conductivit...

Embodiment 3

[0048] A method for preparing an all-solid-state electrolyte for a lithium battery, comprising the following steps:

[0049] (1) In an inert atmosphere and anhydrous environment, mix 1,3-dioxolane (DOL) and 1,2-dimethoxyethane (DME) at a volume ratio of 1:1, Stir evenly;

[0050] (2) In an inert atmosphere and anhydrous environment, add 15wt% thermoplastic polyurethane (TPU) particles to the mixed solution in step (1), and stir at 25°C until the TPU particles are completely dissolved;

[0051] (3) In an inert atmosphere and anhydrous environment, 0.1mol L -1 Lithium tetrafluoroborate (LiBF 4 ) Electrolyte lithium salt is added to the mixed solution in step (2), stirred and mixed evenly at 25°C, and packed into molds that can be sealed according to actual needs. After in-situ polymerization is complete, a new type of non-porous and transparent all-solid-state lithium-lithium battery electrolyte is formed. film.

[0052] Prepared LiBF 4 The decomposition potential and room ...

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Abstract

The invention discloses a method for preparing a lithium battery all-solid electrolyte, and relates to the technical field of all-solid lithium batteries. The invention comprises the following steps: (1) under an inert atmosphere and anhydrous conditions, 1,3-dioxolane and 1,2-Dimethoxyethane is mixed and then stirred; (2) thermoplastic polyurethane (TPU) particles are added to the mixed solution in step (1), and stirred until the TPU particles are dissolved; (3) electrolyte lithium salt is added to the step (1) (2) In the mixed solution, stir and mix, and after the in-situ polymerization is complete, the all-solid-state electrolyte for the lithium battery is obtained. The beneficial effect of the present invention is that: the present invention uses thermoplastic polyurethane as a block polymer, and electrolyte lithium salt as a polymerization initiator at the same time, so that the prepared all-solid-state lithium battery electrolyte is non-porous and transparent, and has good mechanical tensile properties and thermal stability performance.

Description

technical field [0001] The invention relates to the technical field of all-solid lithium batteries, in particular to a method for preparing a lithium battery all-solid electrolyte and the prepared all-solid electrolyte. Background technique [0002] At present, traditional commercial lithium secondary batteries use liquid electrolytes, which are easy to leak, corrode, burn, have short cycle life, and pose potential safety hazards. The all-solid-state lithium battery is a new type of high-safety lithium secondary battery that does not contain flammable and volatile components, and does not have the problem of leakage. Moreover, the structure of the all-solid-state lithium battery is simpler than that of the traditional lithium-ion battery, and its working principle is similar to that of the traditional lithium-ion secondary battery. In addition to conducting lithium ions, the solid electrolyte also acts as a separator. Therefore, all-solid-state lithium batteries are expect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0565H01M10/052
CPCH01M10/0565H01M10/052H01M2300/0082Y02E60/10
Inventor 王春花白国梁刘娜卫巍刘兴江王钧伟韩庆楠冯伊睿杨家怡
Owner ANQING NORMAL UNIV