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A high-safety soft-pack lithium-sulfur battery and its cathode material

A lithium-sulfur battery and cathode material technology, applied in battery electrodes, lithium batteries, secondary batteries, etc., can solve the problems of lithium-sulfur battery capacity decline, lithium-sulfur battery safety hazards, poor cycle life, etc., to achieve the suppression of shuttle effect, Improvement of high-rate charge-discharge cycle life and life-enhancing effects

Inactive Publication Date: 2017-04-12
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: in terms of performance, 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, resulting in a rapid decline in the capacity of lithium-sulfur batteries. Shows extremely poor cycle life; in terms of safety, lithium sulfide reacts with water to generate toxic hydrogen sulfide gas
If traditional cathode materials are used, it will inevitably lead to safety hazards in the use of lithium-sulfur batteries

Method used

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  • A high-safety soft-pack lithium-sulfur battery and its cathode material
  • A high-safety soft-pack lithium-sulfur battery and its cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Example 1: Preparation of nitrogen-containing macroporous carbon

[0053] Get glucose, urea and add deionized water, form a solution after mixing; Wherein, the molar ratio of glucose and urea is 1:1, and the molar ratio of urea and water is 1:10,

[0054] Polymerize the solution at 90°C for 30 minutes to form urea-glucose resin, and add hydrophilic nano-CaCO with a particle size of 15-40nm produced by Ruicheng Warner Nanomaterials Co., Ltd. 3 , to form a suspension after stirring evenly; wherein the mass ratio of urea-glucose resin to calcium carbonate is 1:1; after the suspension is spray-dried, the 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 obtain Nitrogen-containing macroporous carbon.

Embodiment 2

[0055] Embodiment two: preparation of nano lithium manganese oxide

[0056] Weigh lithium hydroxide monohydrate (2.4g) and manganese nitrate hexahydrate (57.4g) according to the mass ratio of 24:574 and dissolve them in 100mL deionized water. -1 10 g of polyethylene glycol (PEG), stirred and dissolved, then spray-dried, calcined at 700° C. for 4 hours, and ball milled for 2 hours to obtain nano-lithium manganese oxide. The ball milling speed was 1000 rpm.

Embodiment 3

[0057] Example 3: Preparation of nano-lithium manganese oxide modified nitrogen-containing macroporous carbon material

[0058] The nano-lithium manganese oxide modified nitrogen-containing macroporous carbon material can be simply obtained by mechanically mixing the nitrogen-containing macroporous carbon obtained in Example 1 with the nano-lithium manganese oxide obtained in Example 2. However, the solid powder is not easy to mix evenly, so the performance of nano-lithium manganese oxide in eliminating hydrogen sulfide and inhibiting the shuttle effect of polysulfide ions is poor.

[0059] Get sucrose, urea and add deionized water, form a solution after mixing; Wherein, the molar ratio of sucrose and urea is 1:1, and the molar ratio of urea and water is 1:10,

[0060] Polymerize the solution at 90°C for 30 minutes to form urea-sucrose resin, and add hydrophilic nano-CaCO with a particle size of 15-40nm produced by Ruicheng Warner Nanomaterials Co., Ltd. 3 With the nano-lithium...

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Abstract

The invention relates to the battery field and aims to provide a high-safety soft-pack lithium-sulfur battery and its positive electrode material. In the lithium-sulfur battery, the positive electrode and the negative electrode are respectively arranged on both sides of the separator to form a sandwich structure, and the electrode material side of the positive electrode and the negative electrode faces the separator; the negative electrode is a lithium metal sheet; the preparation of the positive electrode: the positive electrode material and acetylene black, binder After mixing and grinding evenly, add it to N-methylpyrrolidone, make a paste, apply it on an aluminum film and dry it in the shade; press molding to obtain a positive electrode. The invention greatly improves the use safety of the lithium-sulfur battery, helps to improve the use efficiency of lithium manganese oxide, and greatly improves the speed, capacity and performance stability of the lithium-sulfur battery. The used active material has abundant sources, low cost, no pollution and easy preparation. The cost of the electrode material is low, and the preparation process is simple and easy, which is conducive to large-scale production and has broad application prospects.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a positive electrode material for improving the safety of lithium-sulfur batteries and a preparation method thereof. The invention uses lithium manganate to react with lithium sulfide in water environment to generate harmless substances, thereby avoiding the danger of lithium sulfide reacting with water to generate harmful gas hydrogen sulfide that may be caused by damage to soft packaging, and using lithium manganate to modify nitrogen-containing large High-power, long-life, high-safety soft-pack lithium-sulfur batteries made of porous carbon. 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 batte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/66H01M10/058H01M10/42
CPCH01M4/663H01M4/665H01M10/0525H01M10/058H01M10/4235Y02E60/10Y02P70/50
Inventor 李洲鹏金黎明林启睿路畅刘宾虹
Owner ZHEJIANG UNIV