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Preparation method of easy-to-activate high-carrying-capacity lithium sulfide carbon composite material and application of preparation method

A carbon composite material and lithium sulfide technology, which is applied in lithium batteries, active material electrodes, electrical components, etc., can solve the problems of poor activity of lithium sulfide electrodes and difficult activation of lithium sulfide batteries, so as to improve the safety of preparation and the activation performance , the effect of increasing capacity

Inactive Publication Date: 2019-08-09
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the activity of lithium sulfide electrodes is very poor, and it needs to be charged to a very high potential to be activated, which makes it difficult for lithium sulfide batteries to be activated in the conventional lithium-sulfur battery voltage window (1.8-2.6V).

Method used

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  • Preparation method of easy-to-activate high-carrying-capacity lithium sulfide carbon composite material and application of preparation method
  • Preparation method of easy-to-activate high-carrying-capacity lithium sulfide carbon composite material and application of preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0042] Embodiment one: preparation of glucose thiourea prepolymer

[0043] Dissolve 3.96 g of glucose monohydrate in 3.96 mL of deionized water, and dissolve 1.52 g of thiourea in 6 mL of deionized water. At this time, the molar ratio of glucose to thiourea is 1:1. The thiourea solution was added to the glucose solution, placed in a water bath at 85° C., and 10 wt % hydrochloric acid was added dropwise and fully stirred to keep the pH value at 1. After reacting for 45 minutes, the viscosity of the liquid increased significantly, and after the color changed to reddish brown, 48 mL of deionized water was added to terminate the polymerization, and cooled to obtain a glucose thiourea prepolymer solution.

Embodiment 2

[0044] Example 2: Preparation of primary carbon-coated lithium sulfate

[0045] Lithium sulfate monohydrate is dissolved in its 4 times of mass ion water, lithium sulfate solution is added to the glucose thiourea prepolymer solution of the gained embodiment one, until half of the glucose amount used for the synthesis of glucose thiourea prepolymer (glucose and The mass ratio of lithium sulfate is 1:0.5), heated in a water bath at 85°C, stirred and reacted for 50 minutes, and then spray-dried.

[0046] The powder obtained by drying was heated from room temperature to 160°C at a rate of 10°C / min under a nitrogen atmosphere, and kept for 2 hours to carry out deep polymerization of glucose thiourea resin. Then the temperature was raised to 500°C at a rate of 10°C / min, and kept for 2 hours for initial carbonization. After cooling, it was taken out to obtain primary carbon-coated lithium sulfate.

Embodiment 3

[0047] Example 3: Preparation of Secondary Coating Lithium Sulfate

[0048] Lithium sulfate monohydrate is dissolved in its 4 times of mass ion water, and lithium sulfate solution is added the glucose thiourea prepolymer solution of embodiment one gain, until the quality of the glucose amount that synthetic glucose thiourea prepolymer uses is identical (glucose and The mass ratio of lithium sulfate is 1:1), heated in a water bath at 85°C, stirred and reacted for 50 minutes, and then spray-dried.

[0049] The powder obtained by drying was heated from room temperature to 160°C at a rate of 10°C / min under a nitrogen atmosphere, and kept for 2 hours to carry out deep polymerization of glucose thiourea resin. Then the temperature was raised to 600°C at a rate of 10°C / min, and the temperature was kept for 2 hours for initial carbonization. After cooling, it was taken out to obtain primary carbon-coated lithium sulfate.

[0050] Ball mill the above materials to a particle size of 50...

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Abstract

The invention relates to a lithium battery technology, and aims to provide a preparation method of an easy-to-activate high-carrying-capacity lithium sulfide carbon composite material and an application of the preparation method. The method comprises the steps: taking glucose thiourea resin, obtained through polymerization of glucose and thiourea, as a carbon source, and after the glucose thiourearesin and a lithium sulfate mixed solution are subjected to spray drying, obtaining carbon-coated lithium sulfate through calcination; mixing the mixture with the glucose thiourea resin solution again after ball milling and crushing, carrying out flash freeze drying to obtain a precursor, and performing the calcining to obtain a secondary carbon-coated in-situ synthesis high-carrying-capacity lithium sulfide / carbon composite material. A product prepared by the method has the characteristics of large specific surface area and large pore volume, and the carbon thin wall endows the pores with the deformability, thereby improving the volume expansion generated by lithium sulfide formed by lithium sulfide intercalation in the discharge bearing process. The method effectively inhibits the escape of polysulfide ions, and improves the conductivity. The method effectively improves the activation performance of the lithium sulfide electrode, improves the capacity and the preparation safety of the negative electrode, and is particularly suitable for production of high-capacity lithium sulfide batteries.

Description

technical field [0001] The invention relates to lithium battery technology, in particular to a preparation method and application of an easily activated high-capacity lithium sulfide-carbon composite material. Background technique [0002] Lithium-sulfur battery is a kind of rechargeable lithium battery. Generally, elemental sulfur is used as the positive electrode active material of the battery, and metal lithium is used as the negative electrode active material. 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, and it is a very promising high-energy battery. [0003] When the lithium-sulfur battery is discharged, the negative electrode reaction is that metal lithium loses electrons and becomes lithium ions, and the positive electrode reaction is the electrochemical reduction of sulfur and lithium ions to form sulfide. The po...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/052
CPCH01M4/366H01M4/5815H01M4/625H01M4/628H01M10/052H01M2004/021H01M2004/028Y02E60/10
Inventor 李洲鹏颜鹏刘宾虹
Owner ZHEJIANG UNIV
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