Gel electrolyte as well as preparation method and application thereof

A gel electrolyte and electrolyte salt technology, applied in the field of electrochemistry, can solve problems such as interface deterioration, leakage, and poor contact

Pending Publication Date: 2021-08-06
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its safety issues and poor circulation hinder its commercial application process
[0003] The following problems often exist in secondary batteries such as lithium batteries: (1) Due to the uneven distribution of electrons on the surface of lithium metal, lithium metal is not uniformly dissolved and deposited, and lithium dendrites will continue to be generated during charging and discharging, resulting in interface deterioration. The internal resistance increases and the cycle performance decreases; (2) The generation of lithium dendrites may pierce the diaphragm, causing short circuit of the battery, and even fire and explosion; (3) At present, most lithium metal batteries use liquid electrolyte, which has leakage and fire , Explosion safety issues, and the ionic conductivity of all solid electrolytes at room temperature is basically less than or equal to 10 -4 S cm -1 , the contact with the electrode is not good, the interface resistance is large, and the preparation is complicated and the cost is high

Method used

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  • Gel electrolyte as well as preparation method and application thereof
  • Gel electrolyte as well as preparation method and application thereof
  • Gel electrolyte as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0096] Specific steps:

[0097] (1) The organic solvent used is ethylene carbonate and diethyl carbonate, the volume ratio is 1:1, and the lithium salt used is 1M lithium hexafluorophosphate (LiPF 6 ), be made into homogeneous solution I;

[0098] (2) Add 0.23mol L to the homogeneous solution I under an argon atmosphere -1 Triethylene glycol diacrylate (TEGDA), initiator azobisisoheptanonitrile (ABVN), 0.02mol L -1 The trans-3-methoxy group-1-phenylboronic acid pinacol, stirring and dissolving into precursor solution I;

[0099] Add the precursor solution I into an all-solid-state battery with lithium iron phosphate as the positive electrode, lithium metal as the negative electrode, and a polypropylene film as the diaphragm, or a lithium metal symmetrical battery, and after the battery is assembled, let it stand at 30° C. for 12 hours. A solid-state lithium metal battery with an in-situ gel electrolyte using trans-3-methoxy-1-phenylboronic acid pinacol as an additive was ob...

Embodiment 2

[0101] Specific steps:

[0102] (1) The organic solvents used are dimethyl carbonate, diethyl carbonate, and ethylene carbonate, and the volume ratio is 1:1:1. The lithium salt used is 1M bistrifluoromethylsulfonylimide lithium salt. into a homogeneous solution II;

[0103] (2) Add 0.10mol L to the homogeneous solution II under argon atmosphere -1 Pentaerythritol tetraacrylate, initiator azobisisoheptanonitrile (ABVN), 0.02mol L -1 The n-butyl boric acid, stirring and dissolving into precursor solution II;

[0104] Add the precursor solution II to an all-solid-state battery with lithium iron phosphate as the positive electrode, lithium metal as the negative electrode, and a polypropylene film as the diaphragm, or a symmetrical lithium metal battery. After the battery is assembled, let it stand at 30°C for 12 hours. A solid-state lithium metal battery with an in-situ gel electrolyte with n-butylboronic acid as an additive was obtained.

Embodiment 3

[0106] Specific steps:

[0107] (1) The organic solvent used is dimethyl carbonate, diethyl carbonate, ethylene carbonate, the volume ratio is 1:1:1, and the lithium salt used is 1M lithium hexafluorophosphate (LiPF 6 ) to form a homogeneous solution Ⅲ (LE);

[0108] (2) Add 0.23mol L to the homogeneous solution III under argon atmosphere -1 Triethylene glycol diacrylate (TEGDA), initiator azobisisoheptanonitrile (ABVN), 0.02mol L -1 n-Butylboronic acid (BBA), stirring and dissolving into precursor solution III;

[0109] Add the precursor solution III to an all-solid-state battery with lithium iron phosphate as the positive electrode, lithium metal as the negative electrode, and a polypropylene film as the separator, or a symmetrical lithium metal battery. After assembling the battery, let it stand at 30°C for 12 hours. A solid-state lithium metal battery (BBA+TEGDA) with an in-situ gel electrolyte with n-butylboronic acid as an additive was obtained.

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Abstract

The invention provides a gel electrolyte, a preparation method and application thereof. According to the gel electrolyteprovided by the invention, the gel electrolyte is obtained by gelling by polymerizing a composition comprising boric acid or a derivative thereof, a polymer monomer, a polymerization initiator, an organic solvent, and an electrolyte salt. The invention also relates to a preparation method of the gel electrolyte, a battery or a capacitor comprising the gel electrolyte and a preparation method of the battery.

Description

technical field [0001] This application belongs to the field of electrochemistry. In particular, the present application relates to gel electrolytes, their preparation methods and applications, especially their application in batteries (such as all-solid-state lithium metal batteries). The present application also relates to a battery or capacitor comprising the gel electrolyte and a method for preparing the battery. Background technique [0002] With the rapid development of the electronic energy storage industry, such as electric vehicles and drones, the energy density, cost, cycle and safety of secondary batteries such as lithium-ion batteries are difficult to meet the requirements of these energy storage devices. Its safety issues and poor circulation hinder its commercial application. [0003] The following problems often exist in secondary batteries such as lithium batteries: (1) Due to the uneven distribution of electrons on the surface of lithium metal, lithium met...

Claims

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Application Information

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IPC IPC(8): H01M10/052H01M10/0565H01M10/058H01G11/56
CPCH01M10/0565H01M10/052H01M10/058H01G11/56H01M2300/0082Y02P70/50Y02E60/10
Inventor 陈永胜韩宇周颖朱洁张洪涛
Owner NANKAI UNIV
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