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A kind of solid composite electrolyte membrane and its preparation and application

A technology of composite electrolyte membrane and solid electrolyte, which is applied in the direction of solid electrolyte, electrolyte storage battery manufacturing, electrolyte, etc., can solve the problems of poor flexibility, narrow electrochemical window, and large interface impedance of inorganic solid electrolytes, and achieve low requirements for production equipment, The process is simple and the effect of blocking lithium dendrites

Active Publication Date: 2022-04-12
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional solid polymer electrolytes have low conductivity at room temperature and narrow electrochemical window
Inorganic solid electrolytes have poor flexibility and large interfacial impedance.

Method used

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  • A kind of solid composite electrolyte membrane and its preparation and application
  • A kind of solid composite electrolyte membrane and its preparation and application
  • A kind of solid composite electrolyte membrane and its preparation and application

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preparation example Construction

[0035] Another object of the present invention is to provide a method for preparing a solid composite electrolyte membrane, comprising the following steps:

[0036] Step 1, preparing an inorganic solid electrolyte by solid state reaction;

[0037] In step 1, the inorganic solid electrolyte consists of Li 1+x Al x Ti 2–x (PO 4 ) 3 Represents, wherein, 0

[0038] Inorganic solid electrolyte LATP is currently a common NASICON ceramic solid electrolyte. This solid electrolyte has excellent waterproof performance and lithium ion conductivity, and also has high mechanical strength.

[0039] Step 1 includes the following sub-steps:

[0040] Sub-step 1-1: weighing inorganic lithium salt, aluminum oxide, titanium oxide and phosphate according to the stoichiometric ratio, and mixing;

[0041] Substep 1-2: calcining the system obtained in substep 1;

[0042] Sub-step 1-3: pulverize the system obtained in sub-step 2, sinter, pulverize again, and dry in v...

Embodiment 1

[0076] Weigh 0.0480g of lithium carbonate, 0.0153g of alumina, 0.136g of titanium dioxide and 0.396g of diammonium hydrogen phosphate according to the stoichiometric ratio, mix them uniformly, and sinter at 900°C for 2h. Ball milling with acetone as a solvent, followed by sintering at 900 °C for 2 h, ball milling for 6 h, and finally vacuum drying at 100 °C to obtain the inorganic solid electrolyte Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , abbreviated as LATP-1;

[0077] Take 2.759g of tetrachloro-tere-phenylenedimethanol, add 20mL of anhydrous tetrahydrofuran to dissolve it, after the dissolution is complete, slowly drop 5mmol of 2M LiBH into the solution 4·THF solution, a white precipitate can be observed during the process, the reaction temperature is controlled at 45°C during the dropwise addition, after the dropwise addition is completed, stir and reflux for 6 hours, and the entire reaction process is carried out under the protection of an inert gas. After the reaction was co...

Embodiment 2

[0080] Weigh 0.0480g of lithium carbonate, 0.0153g of alumina, 0.136g of titanium dioxide and 0.396g of diammonium hydrogen phosphate according to the stoichiometric ratio, mix them uniformly, and sinter at 900°C for 2h. Ball milling with acetone as a solvent, followed by sintering at 900 °C for 2 h, ball milling for 6 h, and finally vacuum drying at 100 °C to obtain the inorganic solid electrolyte Li 1.3 Al 0.3 Ti 1.7 (PO 4 ) 3 , abbreviated as LATP-1;

[0081] Take 2.759g of tetrachloro-tere-phenylenedimethanol, add 20mL of anhydrous tetrahydrofuran to dissolve it, after the dissolution is complete, slowly drop 5mmol of 2M LiBH into the solution 4 ·THF solution, a white precipitate can be observed during the process, the reaction temperature is controlled at 45°C during the dropwise addition, after the dropwise addition is completed, stir and reflux for 6 hours, and the entire reaction process is carried out under the protection of an inert gas. After the reaction was c...

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Abstract

The invention relates to a solid composite electrolyte membrane and its preparation and application. The solid composite electrolyte membrane includes an inorganic solid electrolyte, an organic electrolyte and a polymer electrolyte. It is prepared from an inorganic solid electrolyte Li 1+x al x Ti 2–x (PO 4 ) 3 (wherein, 0<x<1), the organic electrolyte and the polymer electrolyte polyoxyethylene (PEO) are mixed according to a certain ratio. The solid-state composite electrolyte membrane prepared by the present invention is an inorganic-organic composite electrolyte membrane, and is preferably used as an electrolyte for an all-solid-state lithium-ion battery. The solid-state composite electrolyte membrane of the present invention not only has high mechanical strength and good electrical conductivity, but also enables lithium to The deposition and detachment on metal lithium are more uniform, which can well prevent the generation of lithium dendrites. The battery prepared with this electrolyte membrane has high discharge specific capacity and good rate performance.

Description

technical field [0001] The invention belongs to the field of electrolyte materials for lithium-ion secondary batteries, and in particular relates to an all-solid-state lithium-ion battery electrolyte with good mechanical properties and good electrical conductivity, as well as its preparation and application. Background technique [0002] As a new type of green secondary battery, all-solid-state lithium-ion batteries have been widely used due to their advantages such as small size, light weight, long cycle life, small self-discharge, and no memory effect. In recent years, with the rapid development of mobile phones and notebooks, as well as the demand for electric and hybrid vehicles, higher requirements have been placed on the energy density and safety performance of batteries. Electrolyte plays an important role in lithium-ion batteries as a medium for lithium ion conduction between positive and negative electrodes. In research in recent years, researchers hope to improve ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/056H01M10/058
CPCH01M10/056H01M10/058H01M2300/0065H01M2300/0091Y02E60/10Y02P70/50
Inventor 范坤庞自钊魏贝贝李化一于书达高月沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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