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Novel cathode material for lithium secondary batteries and lithium secondary batteries with cathode material

A technology for lithium secondary batteries and cathode materials, applied in battery electrodes, lithium storage batteries, non-aqueous electrolyte storage batteries, etc., can solve the problems of poor cycle performance and low utilization rate of positive active materials, and achieve the effect of simple process operation

Inactive Publication Date: 2012-01-11
耿世达
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the solubility of small molecule lithium-sulfur compounds in the discharge product, the utilization rate of the positive electrode active material is low and the cycle performance is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Put trimellitamide and sodium sulfide at a molar ratio of 1:3 into ethanol, stir the mixture well, and react at 100° C. for 20 hours. The reaction product was washed, filtered with suction, and dried at 80° C. for 20 hours to obtain trithiobenzenetriamide.

[0024] Weigh trithiobenzenetriamide, graphene, and polyvinylidene fluoride according to a weight ratio of 5:1:0.5, mix them evenly, coat them on the current collector, dry and roll them into a positive electrode sheet. The negative electrode is made of lithium sheet. The prepared lithium secondary battery positive electrode material is applied to the lithium secondary battery, and its initial discharge capacity is 612mAh / g, and after 100 discharges at 10C, the discharge specific capacity is 160mAh / g.

Embodiment 2

[0026] Put oxalamide and sodium sulfide at a molar ratio of 1:2 into water, stir the mixture well, and react at 120° C. for 20 hours. The reaction product was washed, filtered with suction, and dried at 80°C for 20 hours to obtain dithiooxalamide.

[0027] Dithiooxalamide, graphite, and polyvinylidene fluoride were weighed according to a weight ratio of 5:1.5:1, mixed evenly, coated on the current collector, dried and rolled to form a positive electrode sheet. The negative electrode is made of lithium sheet. The prepared lithium secondary battery positive electrode material is applied to the lithium secondary battery, and its initial discharge capacity is 620mAh / g, and after 100 discharges at 10C, the discharge specific capacity is 165mAh / g.

Embodiment 3

[0029] Methyl benzoate and sodium sulfide with a molar ratio of 1:1 were put into water, the mixture was stirred well, and reacted at 150° C. for 10 hours. The reaction product was washed, filtered with suction, and dried at 80° C. for 10 hours to obtain methyl thiobenzoate.

[0030] Weigh methyl thiobenzoate, conductive carbon black, and sodium carboxymethyl cellulose according to a weight ratio of 5:1:1, mix them uniformly, coat them on a current collector, dry and roll them into a positive electrode sheet. The negative electrode is made of lithium sheet. The prepared lithium secondary battery cathode material is applied to the lithium secondary battery, and its initial discharge capacity is 620mAh / g, and after 100 discharges at 10C, the discharge specific capacity is 168mAh / g.

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Abstract

The invention relates to a novel cathode material for lithium secondary batteries and the lithium secondary batteries with the cathode material. The cathode material provided by the invention is a thiocarbonyl compound, at least contains a carbon-sulfur double bond, and is at least one component selected from the group consisting of thiocarboxylic acid, thioamide, thioxo aldehyde, thioxo ketone, thioxo isocyanate, thioxo acid anhydride and thioacyl peroxide, and is prepared by the reaction of metal sulfide, carbonyl-containing carboxylic acid or amide, aldehyde, ketone, isocyanate, acid anhydride and acyl peroxide. When the cathode material is applied in lithium secondary batteries, the first-time discharge capacity of the lithium secondary batteries is greater than 600mAh / g, and the discharge capacity is greater than 150mAh / g after discharging 100 times for 10 C.

Description

technical field [0001] The invention relates to a novel positive pole material of a lithium secondary battery and a lithium secondary battery using the positive pole material. Background technique [0002] With the development of electronic and communication devices towards small size, portability and high performance, people put forward higher requirements for the battery performance of these devices. [0003] Lithium battery is the most promising battery system. The specific capacity of metal lithium is the highest among the existing negative electrode materials, up to 3861mAh / g. As an emerging technology, lithium batteries have advantages that traditional batteries cannot match, such as high specific capacity, stable discharge voltage, no memory effect, and no toxic elements such as mercury, cadmium, and lead. People pay more and more attention to them. Batteries have become the main trend of battery development, but due to the limitation of the theoretical specific capa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/137H01M10/052
CPCY02E60/122Y02E60/10
Inventor 耿世达
Owner 耿世达
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