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Room-temperature all-liquid-state lithium-sulfur battery and preparation method thereof

A liquid lithium and sulfur battery technology, which is applied in the manufacture of lithium batteries, electrolyte batteries, secondary batteries, 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 inhibiting shuttles Effect

Active Publication Date: 2021-06-18
GUANGDONG UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Room-temperature all-liquid-state lithium-sulfur battery and preparation method thereof
  • Room-temperature all-liquid-state lithium-sulfur battery and preparation method thereof
  • Room-temperature all-liquid-state lithium-sulfur battery and preparation method thereof

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preparation example Construction

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

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

[0039] Step S2: making a 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 put the current collector on the lead clip and immerse in the liquid polysulfide positive electrode. The diaphragm is sandwiched between the positive electrode pool and the negative electrode pool, and the H-type electrolytic cell is sealed as a whole to form the room temperature all-liquid lithium-sulfur battery.

[00...

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 hours to obtain a room temperature liquid alloy anode;

[0061] (2) Mix 1 g of boron nitride and 1 g of guanidine carbonate and ball mill for 48 h to obtain a uniformly mixed powder, add 20 mg of the mixed powder to 20 ml of NMP, and stir mechanically for 12 h to obtain a stable and uniform dispersion A; The ion battery diaphragm is used as filter paper, the dispersion A is filtered by suction, the NMP on the diaphragm is washed away with deionized water, and the lithium ion battery diaphragm with boron nitride coating can be obtained after the diaphragm is dried;

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

Embodiment 2

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

[0067] (2) Mix 2 g of boron nitride and 2 g of guanidine carbonate and ball mill for 48 h to obtain a uniformly mixed powder. Add 50 mg of the mixed powder to 50 ml of NMP and stir mechanically for 12 h to obtain a stable and uniform dispersion A; The ion battery separator is used as filter paper, the dispersion A is filtered by suction, the NMP is washed away with deionized water, and the lithium ion battery separator with boron nitride coating can be obtained after drying the separator;

[0068] (3) Use an H-type electrolytic cell to assemble an ordinary lithium-sulfur battery, and short-circuit the positive and negative electrodes for discharge. The polysulfides will diffuse into the electrolyte, and the electrolyte will turn brown. The electrolyte was collected, 20 mg of eleme...

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Abstract

The invention provides a room-temperature all-liquid-state lithium-sulfur battery and a preparation method thereof. The room-temperature all-liquid-state lithium-sulfur battery comprises a diaphragm, a room-temperature liquid-state alloy negative electrode and a liquid-state polysulfide positive electrode which are respectively arranged on two sides of the diaphragm, and a current collector connected with the liquid-state polysulfide positive electrode, the room-temperature liquid alloy negative electrode is formed by reacting lithium and mercury according to a preset proportion, and the diaphragm is a lithium ion battery diaphragm loaded with a boron nitride coating; the liquid polysulfide positive electrode is a positive electrode; and the current collector comprises an aluminum foil coated with a conductive carbon material. The liquid alloy is used for replacing metal lithium, generation of lithium dendrites is inhibited, the cycle life of the battery is prolonged, and the safety performance of the battery is improved; the liquid polysulfide is used for replacing an elemental sulfur positive electrode, so that the conductivity of the positive electrode is greatly improved, and the problem of volume expansion in the charge-discharge process is effectively relieved; and the diaphragm is subjected to surface modification and structure improvement, so that shuttling of polysulfide is effectively inhibited, loss and self discharge of active substances are reduced, and coulombic efficiency of the lithium-sulfur battery is improved.

Description

technical field [0001] The invention relates to the technical field of lithium batteries, in particular to a room temperature all-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 electrodes have good electrical conductivity. Good, simple electrode structure, 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, which leads to poor mechanical properties of the battery and serious loss of active materials; Shuttle will lead to active material loss and self-discharge; the growth of lithium dendrites in the anode leads to lower C...

Claims

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Application Information

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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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