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A kind of all-liquid lithium-sulfur battery at room temperature and preparation method thereof

A liquid lithium-sulfur battery technology, applied in the manufacture of lithium batteries, electrolyte batteries, battery electrodes, etc., can solve the problems of inconvenient use of solid-state lithium-sulfur batteries, and achieve the goal of inhibiting the formation of lithium dendrites, alleviating volume expansion, and improving Coulombic efficiency Effect

Active Publication Date: 2022-05-24
GUANGDONG UNIV OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the technical problem of inconvenient use of the existing solid-state lithium-sulfur battery, the present invention provides a room-temperature all-liquid lithium-sulfur battery and a preparation method thereof

Method used

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  • A kind of all-liquid lithium-sulfur battery at room temperature and preparation method thereof
  • A kind of all-liquid lithium-sulfur battery at room temperature and preparation method thereof
  • A kind of all-liquid lithium-sulfur battery at room temperature and preparation method thereof

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preparation example Construction

[0037] On the other hand, the present invention also provides a preparation method of a room temperature full liquid lithium-sulfur battery, comprising the following steps:

[0038] Step S1: making a room temperature liquid alloy negative electrode;

[0039] Step S2: making the diaphragm;

[0040] Step S3: making a liquid polysulfide positive electrode;

[0041] Step S4: making a current collector;

[0042] Step S5: inject the room temperature liquid alloy negative electrode and the liquid polysulfide positive electrode into the replaceable membrane H-type electrolytic cell, insert the foil electrode into the room temperature liquid alloy negative electrode, and immerse the current collector into the liquid polysulfide positive electrode on the lead clip, The separator is sandwiched between the positive electrode pool and the negative electrode pool, and the whole H-type electrolytic cell is sealed to form the room temperature full liquid lithium-sulfur battery.

[0043] Th...

Embodiment 1

[0060] (1) Take 15 mg of metal lithium from which the oxide film has been removed, add it to 0.733 g of metal mercury, and let it stand for 24 h to obtain a room temperature liquid alloy negative electrode;

[0061] (2) 1 g of boron nitride and 1 g of guanidine carbonate were mixed and ball-milled for 48 h to obtain a uniform mixed powder, 20 mg of the mixed powder was added to 20 ml of NMP, and mechanically stirred for 12 h to obtain a stable and uniform dispersion A; The ion battery separator is used as filter paper, the dispersion A is suction filtered, the NMP on the separator is washed with deionized water, and the separator is dried to obtain a lithium ion battery separator with a boron nitride coating;

[0062] (3) Use an H-type electrolytic cell to assemble an ordinary lithium-sulfur battery, short-circuit the positive and negative electrodes to discharge, and the polysulfide will diffuse into the electrolyte, and the electrolyte will turn brown. Collect the electrolyt...

Embodiment 2

[0066] (1) Take 90 mg of metal lithium from which the oxide film was removed, add it to 4.398 g of metal mercury, and let it stand for 24 h to obtain a room temperature liquid alloy negative electrode;

[0067] (2) 2 g of boron nitride and 2 g of guanidine carbonate were mixed and ball-milled for 48 h to obtain a uniform mixed powder, 50 mg of mixed powder was added to 50 ml of NMP, and mechanically stirred for 12 h to obtain a stable and uniform dispersion A; The ion battery separator is used as filter paper, the dispersion A is suction filtered, NMP is washed off with deionized water, and the separator is dried to obtain a lithium ion battery separator with a boron nitride coating;

[0068] (3) Use an H-type electrolytic cell to assemble an ordinary lithium-sulfur battery, short-circuit the positive and negative electrodes to discharge, and the polysulfide will diffuse into the electrolyte, and the electrolyte will turn brown. Collect the electrolyte, add 20 mg of elemental ...

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Abstract

The invention provides a room-temperature all-liquid lithium-sulfur battery and a preparation method thereof, comprising a diaphragm, a room-temperature liquid alloy negative electrode and a liquid polysulfide positive electrode respectively installed on both sides of the diaphragm, and a current collector connected to the liquid polysulfide positive electrode; The negative electrode of the room temperature liquid alloy is formed by the reaction of lithium and mercury according to a preset ratio, and the separator is a lithium ion battery separator with a boron nitride coating; the positive electrode of the liquid polysulfide; the current collector includes a coating Aluminum foil covered with conductive carbon material. The invention suppresses the formation of lithium dendrites by replacing metal lithium with a liquid alloy, and improves the cycle life and safety performance of the battery. The problem of volume expansion; through surface modification and structural improvement of the separator, the shuttle of polysulfides can be effectively inhibited, the loss of active materials and self-discharge can be reduced, and the Coulombic efficiency of lithium-sulfur batteries can be improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a room temperature full liquid lithium-sulfur battery and a preparation method thereof. Background technique [0002] In recent years, liquid batteries have broad prospects in the field of energy storage batteries, which have the following advantages: 1) liquid batteries have no volume change during charging and discharging; 2) liquid metal electrodes have no dendrite growth problems; 3) liquid electrode conductivity good, the electrode structure is simple, etc. The preparation of liquid lithium-sulfur batteries can solve many existing problems of lithium-sulfur batteries, such as the large volume expansion during charging and discharging, resulting in poor mechanical properties of the battery and serious loss of active materials; Shuttling leads to loss of active material and self-discharge; the growth of lithium dendrites at the negative electrode results in lower Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M4/40H01M50/431H01M50/449H01M10/052H01M10/058H01M10/42
CPCH01M4/5815H01M4/405H01M10/058H01M10/052H01M10/4235Y02P70/50Y02E60/10
Inventor 陶涛高雨璇邓超范烨鲁圣国
Owner GUANGDONG UNIV OF TECH
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