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Positive electrode sulfur-carrying material of lithium-sulfur battery and preparation method of lithium-sulfur battery

A lithium-sulfur battery and positive electrode material technology, which is applied in the direction of battery electrodes, electrolyte storage battery manufacturing, secondary batteries, etc., can solve the problems of poor electrolyte absorption capacity, capacity loss, unfavorable high-current charging and discharging of Nafion membrane, etc., and achieve high efficiency. Increased rate charge and discharge cycle life, speed capacity and performance stability, and the effect of improving cycle stability

Inactive Publication Date: 2015-04-29
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest problem of lithium-sulfur batteries is that lithium polysulfide dissolved in the electrolyte is formed during charging and discharging, and the dissolved lithium polysulfide reacts with lithium metal in the negative electrode, causing capacity loss, which leads to a rapid decline in the capacity of lithium-sulfur batteries, showing extreme poor cycle life
But Li + The concentration of lithium ions in the Nafion-type membrane is limited, and polysulfide ions will also be adsorbed, resulting in the loss of positive active materials and capacity decline.
And Li + The strength of the Nafion-type membrane is weak, and it cannot resist the formation of dendrites on the lithium electrode, which will cause the diaphragm to penetrate and cause a short circuit.
In addition, Li + Type Nafion membrane has poor electrolyte absorption capacity and high internal resistance, which is not conducive to high current charging and discharging

Method used

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  • Positive electrode sulfur-carrying material of lithium-sulfur battery and preparation method of lithium-sulfur battery
  • Positive electrode sulfur-carrying material of lithium-sulfur battery and preparation method of lithium-sulfur battery
  • Positive electrode sulfur-carrying material of lithium-sulfur battery and preparation method of lithium-sulfur battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of Nano Lithium Cobalt Oxide

[0043] Weigh lithium hydroxide monohydrate (2.4g) and cobalt nitrate hexahydrate (29.1g) according to the mass ratio of 24:291 and dissolve them in 100ml of deionized water, add 10g of polyethylene glycol (PEG) with a molecular weight of 10000g / mol, and stir After dissolving, it was spray-dried, calcined at 700° C. for 4 hours, and ball milled for 2 hours to obtain nano-lithium cobaltate. The ball milling speed was 1000 rpm.

Embodiment 2

[0044] Example 2: Preparation of Nanoscale Lithium Cobaltate Modified Sulfur-Containing Macroporous Carbon Material

[0045] Add sucrose and thiourea to deionized water, and mix uniformly to form a solution; wherein the molar ratio of sucrose and thiourea is 1:1, and the molar ratio of thiourea to water is 1:10,

[0046] Polymerize the solution at 90°C for 30 minutes to form a thiourea-sucrose resin, and add hydrophilic nano-CaCO with a particle size of 15-40nm 3 (produced by Ruicheng Warner Nano Materials Co., Ltd.) and the nano-lithium cobaltate prepared in Example 1 form a suspension after stirring; wherein the mass ratio of thiourea-sucrose resin, calcium carbonate and lithium cobaltate is 1: 1:0.1; after the suspension was spray-dried, in flowing N 2 Put it in a tube furnace under protection, heat at 200°C and 700°C for 2 hours and 4 hours respectively, wash the carbonized product with 5wt% hydrochloric acid and deionized water successively, and dry at a constant tempera...

Embodiment 3

[0047] Example Three: Preparation of Positive Electrode Material

[0048] Add water-soluble starch and thiourea to deionized water, and mix uniformly to form a solution; wherein, the molar ratio of water-soluble starch to thiourea is 1:1, and the molar ratio of thiourea to water is 1:10,

[0049] Polymerize the solution at 90°C for 30 minutes to form thiourea-starch resin, add hydrophilic nano-CaCO with a particle size of 15-40nm 3 (produced by Ruicheng Warner Nano Materials Co., Ltd.) and the nano-lithium cobaltate prepared in Example 1 form a suspension after stirring; wherein the mass ratio of thiourea-starch resin, calcium carbonate and lithium cobaltate is 1: 1:0.3; after the suspension was spray-dried, in flowing N 2 Put it in a tube furnace under protection, heat at 200°C and 700°C for 2 hours and 4 hours respectively, wash the carbonized product with 5wt% hydrochloric acid and deionized water successively, and dry at a constant temperature at 120°C for 4 hours to obta...

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Abstract

The invention relates to the field of batteries, and aims at providing a positive electrode sulfur-carrying material of a lithium-sulfur battery and a preparation method of the lithium-sulfur battery. The preparation method comprises the following steps: adding thiourea and water-soluble monosaccharide or polysaccharide into ionized water to prepare a solution, and performing polymerization to prepare thiourea-glucoresin; further adding hydrophilic nano calcium carbonate and nano lithium cobalt oxide, and uniformly stirring to prepare a turbid liquid; and performing spray-drying, heating at 200 DEG C and 700 DEG C with flow N2, sequentially washing a carbonization product with hydrochloric acid and deionized water, and drying at constant temperature, thereby obtaining lithium cobalt oxide modified sulfur-containing macropore carbon. According to preparation method, sulfur in the sulfur-containing macropore carbon has special affinity with Co, the dispersion distribution of the nano lithium cobalt oxide can be intensified, the use efficiency of the lithium cobalt oxide can be improved, the conductivity of the macropore carbon is also improved due to doping the sulfur, a certain sulfion accumulation function can be also achieved, and the speed capacity and the property stability of the lithium-sulfur battery are greatly improved.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a sulfur-containing macroporous carbon modified with lithium cobaltate and a preparation method thereof, and a lithium-sulfur battery prepared by modifying the sulfur-containing macroporous carbon with lithium cobaltate. Background technique [0002] Lithium-sulfur battery is a kind of lithium-ion battery. Sulfur is used as the positive electrode material of the battery. It has the advantages of light weight, large capacity, and no memory effect. The specific energy of lithium-sulfur batteries is much higher than that of commercially widely used lithium-ion batteries. Moreover, sulfur is an environmentally friendly element that basically has no pollution to the environment. Lithium-sulfur batteries are a very promising lithium-ion battery. [0003] Lithium-sulfur batteries use metallic lithium as the negative electrode material and use a liquid electrolyte. During discharge, the negati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/587H01M4/62H01M10/058
CPCH01M4/38H01M4/525H01M4/587H01M4/628H01M10/0525Y02E60/10Y02P70/50
Inventor 刘宾虹李洲鹏
Owner ZHEJIANG UNIV
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