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Additive for battery, cathode material containing same and preparation method for cathode material

A technology of positive electrode materials and additives, applied in the direction of electrode manufacturing, battery electrodes, electrolyte layer coatings, etc., can solve problems such as reducing sulfur utilization rate, specific capacity and cycle performance, increasing electrolyte viscosity and ion migration resistance, etc., to achieve reduction Effects of adverse effects, inhibition of dissolution, and reduction of loss of active substances

Inactive Publication Date: 2014-01-15
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The shuttle effect caused by the dissolution of polysulfides is one of the most critical problems in lithium-sulfur batteries, which significantly reduces the utilization rate of sulfur, specific capacity and cycle performance, while increasing the viscosity of the electrolyte and the migration resistance of ions.

Method used

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  • Additive for battery, cathode material containing same and preparation method for cathode material
  • Additive for battery, cathode material containing same and preparation method for cathode material
  • Additive for battery, cathode material containing same and preparation method for cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The additive provided in this example is a composite material of glucose (Glucose) and Super P, and the preparation method is as follows: take 1 g of Super P and 5 g of glucose and disperse them in 80 ml of deionized water, ultrasonically disperse them in an ultrasonic cleaner for 10 min, and transfer them to 100 mL In a hydrothermal reactor, react at 160°C for 48h. After the reaction is finished, filter with suction, dry at 65°C, and grind to obtain a composite material of glucose and Super P, that is, an additive, and then add the additive to the C / S system. The composite method is the same as in the comparative example, that is, the C / S S / Glucose composite cathode material, C: 58wt%, S: 40.00wt%, additive: 2.00wt% in the cathode material. The methods of preparing the positive electrode sheet, assembling the battery and testing the battery are the same as those in the comparative example. The battery charge and discharge test results show that the first charge and di...

Embodiment 2

[0033] The additive provided in this example is a composite material of 2.5g of glucose (Glucose) and 1g of Super P, and the preparation method is the same as that of Example 1. The prepared additive is added to the C / S system, and the composite method is the same as that in the comparative example, that is, a C / S / Glucose composite positive electrode material is obtained, and in the positive electrode material, C: 58wt%, S: 40.00wt%, additive: 2.00 wt%. The methods of preparing the positive electrode sheet, assembling the battery and testing the battery are the same as those in the comparative example. The battery constant current charge and discharge test shows that the first discharge specific capacity is: 1106mAh g -1 . Specific capacity after 50 cycles: 843mAh g -1 , the specific capacity after 100 cycles is 821mAh·g -1 . see results figure 2 shown. Compared with the battery without additives, the discharge specific capacity and cycle stability of the battery are g...

Embodiment 3

[0035] The additive provided in this example is a composite material of 1 g of glucose (Glucose) and 1 g of Super P, and the preparation method is the same as that of Example 1. The prepared additive is added to the C / S system, and the composite method is the same as that in the comparative example, that is, a C / S / Glucose composite positive electrode material is obtained, and in the positive electrode material, C: 58wt%, S: 40.00wt%, additive: 2.00 wt%. The methods of preparing the positive electrode sheet, assembling the battery and testing the battery are the same as those in the comparative example. The battery constant current charge and discharge test shows that the first discharge specific capacity is: 1123mAh g -1 . Specific capacity after 50 cycles: 849mAh·g -1 , specific capacity after 100 cycles: 815mAh·g -1 . Compared with the battery without additives, the discharge specific capacity and cycle stability of the battery are greatly improved after adding glucose ...

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Abstract

The invention provides an additive for a lithium sulphur battery, a cathode material containing the same and a preparation method for the cathode material. The additive is a product formed by carbonizing and compounding a carbon material and monosaccharide or polysaccharide polymerized by monosaccharide, wherein the monosaccharide and the polysaccharide contain intensive arc pair electron groups. The intensive arc pair electron group is -C=O or -OH. The monosaccharide is selected from glucose, fructose, galactose, ribose, glycogen and ribodesose. The conductive carbon material in the cathode material has good adsorption capacity, large specific surface area, and high pore volume and adopts a porous structure, and the electrochemical active substance is sulphur. The additive is the substance containing the intensive arc pair electron group. Polysulfide lithium produced during the discharge process can perform interaction with the additive in a mode of coordination and the like, so that the dissolution of the polysulfide lithium in electrolyte is restrained, and the loss of the active substance and the lithium cathode corrosion, rapid capacity fading influence and the like can be effectively reduced.

Description

technical field [0001] The present invention relates to a novel carbon-sulfur positive electrode material applied to lithium-sulfur batteries and a preparation method thereof, in particular to additives for carbon-sulfur positive electrode materials, in particular to glucose, fructose, galactose, Ribose, deoxyribose and other monosaccharides and their polymerized polysaccharides are compounded with carbon materials to form additive A and the preparation method of the corresponding C / S / A positive electrode material, and the preparation of lithium-sulfur battery based on the C / S / A positive electrode material , Assembly and testing technology. Background technique [0002] Currently, with Li 2 CoO 2 , LiFePO 4 Lithium-ion secondary batteries such as cathode materials have been widely used. However, limited by the theoretical specific energy of these positive electrode materials, the existing lithium-ion battery system is difficult to meet the needs of lightweight, miniaturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/139
CPCH01M4/0407H01M4/622H01M4/628Y02E60/10
Inventor 周成冈王亮张珊李琦旸吴金平
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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