Composite solid electrolyte and preparation method thereof

A solid electrolyte, a certain amount of technology, applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, circuits, etc., can solve problems such as narrow electrochemical stability window, low room temperature ionic conductivity, low density, strong salt dissociation ability, etc. Achieve the effects of eliminating ion transport resistance, enhancing high voltage stability, and wide electrochemical stability window

Pending Publication Date: 2022-05-13
GUANGDONG MIC POWER NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyethylene oxide (PEO)-based polyether electrolytes have been studied for decades due to their low density, strong salt dissociation ability, and good lithium metal compatibility, but are still limited by inherently low room temperature ionic conductivity and Limitations of a narrow electrochemical stability window

Method used

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  • Composite solid electrolyte and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] S1: Mix 15 parts by volume of boron trifluoride ether with 25 parts by volume of dichloromethane to obtain a mixed solution, heat the mixed solution to 35°C, and then add 25 parts by volume of 3-methyl-3 -Hydroxymethyloxetane, and then react at a constant temperature at 35°C for 25h to obtain solution A;

[0037] S2: adding solution A dropwise to ice water for precipitation, filtering, and freeze-drying the filter residue to obtain hyperbranched ether polymer particles;

[0038] S3: Dissolve 7.5 parts by mass of hyperbranched ether polymer particles in 100 parts by mass of N,N-dimethylformamide to obtain solution B, and dissolve 7.5 parts by mass of PVDF-HFP in 100 parts by mass of N,N- - in dimethylformamide, solution C is obtained;

[0039] S4: After mixing 30 parts by mass of solution B and 40 parts by mass of solution C, add 2.5 parts by mass of LiTFSI, mix evenly to obtain a slurry, and coat the slurry on both sides of a PP diaphragm with a thickness of 5 μm (one-...

Embodiment 2

[0042] S1: Mix 10 parts by volume of oxalic acid and 20 parts by volume of propane to obtain a mixed solution, heat the mixed solution to 50°C, and then add 20 parts by volume of 3-ethyl-3-hydroxymethyloxaphrine dropwise to the mixed solution Cyclobutane, and then react at a constant temperature of 50°C for 20h to obtain solution A;

[0043] S2: adding the solution A dropwise into ice water for precipitation, filtering, and freeze-drying the filter residue to obtain hyperbranched ether polymer particles;

[0044] S3: Dissolving 5 parts by mass of hyperbranched ether polymer particles in 100 parts by mass of N,N-dimethylformamide to obtain solution B, dissolving 10 parts by mass of PPSU in 100 parts by mass of N,N-dimethylformamide In base formamide, solution C is obtained;

[0045] S4: After mixing 20 parts by mass of solution B and 50 parts by mass of solution C, add 3.5 parts by mass of LiPF 6 , mixed evenly to obtain a slurry, the slurry was coated on both sides of a 5 μm...

Embodiment 3

[0047] S1: Mix 13 parts by volume of stannous oxalate and 10 parts by volume of n-hexane to obtain a mixed solution, heat the mixed solution to 25°C, and then add 30 parts by volume of 3,3-bismethylol- 1-Oxetane, and then react at a constant temperature at 25°C for 30h to obtain solution A;

[0048] S2: adding the solution A dropwise into ice water for precipitation, filtering, and freeze-drying the filter residue to obtain hyperbranched ether polymer particles;

[0049] S3: Dissolve 10 parts by mass of hyperbranched ether polymer particles in 100 parts by mass of N,N-dimethylformamide to obtain solution B, and dissolve 5 parts by mass of PVDF-HFP in 100 parts by mass of N,N- In dimethylformamide, solution C is obtained;

[0050] S4: After mixing 40 parts by mass of solution B and 40 parts by mass of solution C, add 1.0 parts by mass of LiBF 4 , mixed evenly to obtain a slurry, the slurry was coated on both sides of a 5 μm pp separator (one-side coating thickness 8 μm), and dr...

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Abstract

The invention discloses a composite solid electrolyte and a preparation method thereof, and the preparation method comprises the following steps: S1, mixing a certain amount of an alkyl oxetane monomer, a catalyst and a first organic solvent, and carrying out a constant temperature reaction at 20-50 DEG C for 20-30 h to obtain a solution A; s2, dropwise adding the solution A into ice water for precipitation, and separating and drying to obtain hyperbranched ether polymer particles; s3, dissolving the hyperbranched ether polymer particles in a second organic solvent to obtain a solution B, and dissolving a certain amount of polymer resin in a third organic solvent to obtain a solution C; and S4, mixing the solution B and the solution C, adding a lithium salt, uniformly mixing to obtain slurry, coating a polyolefin diaphragm with the slurry, and drying to obtain the composite solid electrolyte. The composite electrolyte can realize the mechanical properties of wide electrochemical stability window, high ionic conductivity and rigidity and softness.

Description

technical field [0001] The invention relates to the technical field of lithium battery electrolytes, in particular to a composite solid electrolyte and a preparation method thereof. Background technique [0002] The increasing demands of portable electronic devices, electric vehicles, and smart grids have driven the transformation and development of electrochemical energy storage systems. In order to pursue high-performance secondary batteries, metal lithium is preferred due to its extremely high theoretical specific capacity (3860mAh / g), low mass density (0.53g / cm2) and ultra-low redox potential (-3.04V vs standard hydrogen electrode). become an ideal negative electrode material. However, while satisfying high energy density, the uncontrollable interfacial side reactions, Li dendrites, and dead Li generation of traditional liquid metal lithium batteries (LMBs) make safety an important challenge for Li metal batteries. Compared with traditional liquid organic electrolytes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/058H01M10/056
CPCH01M10/052H01M10/058H01M10/056Y02P70/50
Inventor 王潇晗范鑫铭黄培英陈志勇
Owner GUANGDONG MIC POWER NEW ENERGY CO LTD
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