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Lithium sulfide-porpous carbon compound positive material for lithium ion battery and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, which is applied in the field of battery technology and new energy materials, can solve problems such as poor cycle performance and poor safety performance, and achieve the effects of high capacity, diffusion prevention, and long cycle life

Inactive Publication Date: 2011-08-24
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome the problems of poor cycle performance and poor safety performance in the existing lithium-sulfur battery system, and provide a lithium sulfide-porous carbon composite positive electrode material for lithium ion batteries and a manufacturing method thereof. The composite positive electrode material has high specific capacity and long cycle life, its preparation process is simple, and its application prospects are broad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Preparation of lithium sulfide-mesoporous carbon positive electrode by chemical pre-intercalation lithium method

[0029] 1. Preparation of sulfur-mesoporous carbon composites

[0030] Select a pore volume of 1-1.5cm 3 / g, and mesoporous carbon fibers with a uniform pore structure of 3-4nm and elemental sulfur are used as raw materials, and elemental sulfur and mesoporous carbon are ball milled in an inert atmosphere for 2 hours in a ratio of 3:1, and the mixture obtained by ball milling is transferred to a place filled with argon In an air-tight sealed tank, heat to 150°C for 24 hours, so that the sulfur can fully diffuse into the porous carbon to form a sulfur-porous carbon composite.

[0031] 2. Preparation of lithium sulfide-mesoporous carbon cathode sheet

[0032] Mix the sulfur-porous carbon composite prepared in step 1, polyvinylidene fluoride (binder) and acetylene black (conductive agent) in a weight ratio of 8:1:1, add an appropriate amount of NMP...

Embodiment 2

[0035] Example 2: Preparation of lithium sulfide-carbon nanotube positive electrode by chemical pre-intercalation lithium method

[0036] 1. Preparation of sulfur-carbon nanotube composites

[0037] Select a pore volume of 1-1.5cm 3 / g, and mesoporous carbon fibers with a uniform pore structure of 5-10nm and elemental sulfur as raw materials, elemental sulfur and mesoporous carbon were ball milled in an inert atmosphere for 2 hours at a ratio of 0.3:1, and the resulting mixture was transferred to a place filled with argon In an airtight sealed tank, heat to 148°C for 24 hours, so that sulfur can fully diffuse into the porous carbon to form sulfur-carbon nanotube composites.

[0038] 2. Preparation of lithium sulfide-carbon nanotube cathode sheet

[0039] Mix the sulfur-porous carbon composite prepared in step 1, polyvinylidene fluoride (binder) and acetylene black (conductive agent) in a weight ratio of 8:1:1, add an appropriate amount of NMP solvent, grind and mix to form a ...

Embodiment 3

[0042] Example 3: Preparation of lithium sulfide-porous carbon positive electrode by electrochemical pre-intercalation lithium method

[0043] 1. Select a pore volume of 1-1.5cm 3 / g, and ordered mesoporous carbon CMK with 3-4nm uniform pore structure and elemental sulfur as raw materials, elemental sulfur and mesoporous carbon were ball milled in an inert atmosphere for 2.5 hours at a ratio of 3.5:1, and the mixture obtained by ball milling was transferred to Put it into a sealed tank filled with argon, and heat it to 150°C for 36 hours, so that the sulfur can fully diffuse into the porous carbon to form a sulfur-porous carbon composite.

[0044] 2. Preparation of lithium sulfide-porous carbon cathode sheet

[0045] Mix the sulfur-porous carbon composite prepared in step 1, polyvinylidene fluoride (binder) and acetylene black (conductive agent) in a weight ratio of 8:1:1, add an appropriate amount of NMP solvent, grind and mix to form a slurry, When it is half-dried, accord...

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Abstract

The invention provides a lithium sulfide-porpous carbon compound positive material for a lithium ion battery and a preparation method thereof. The positive material is formed by compounding lithium sulfide and ordered porous carbon, wherein the mass fraction of the lithium sulfide in the compound material is 20-80%; and the lithium sulfide exists in the pore spaces of the porous carbon. The preparation method comprises the following steps: firstly, carrying out ball milling on the ordered porous carbon and sulfur in the presence of inert gas; then carrying out thermal processing on the milled mixture at the temperature of 145-155 DEG C so that the sulfur fully is dispersed into the porous carbon; and finally, reacting lithium with the sulfur so as to generate the lithium sulfide by a chemical or electrochemical method, thereby obtaining the positive material provided by the invention. According to the invention, the preparation process is simple, and the raw material source is wide; the prepared positive material is used in a mode of pre-embedding lithium in a positive electrode, metal lithium is not required to serve as a negative electrode, and a carbon negative electrode, a silicon negative electrode and the like are used, thereby improving the safety performance and the assembling performance; the positive material has the advantages of good conductivity, high capacity and good circulation performance; and the positive material has a wide application prospect and the preparation method is suitable for industrial production.

Description

Technical field: [0001] The invention relates to a lithium sulfide-porous carbon composite cathode material for a lithium ion battery and a manufacturing method thereof, belonging to the technical fields of battery technology and new energy materials. Background technique: [0002] With the rapid development of society and technology, especially in the fields of electric vehicles, communication equipment, national defense and military industry with high energy density requirements, the energy density of lithium-ion batteries is increasingly demanding. However, the energy density of commercialized lithium-ion batteries has been difficult to continue to increase. The key to limiting the improvement of the energy density of lithium-ion batteries is that the specific energy of the positive electrode material is too low. For example, the current research and application of more positive electrode materials include lithium cobalt oxide, spinel lithium manganese oxide, lithium nick...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M4/1397
CPCY02E60/12Y02E60/122Y02E60/10
Inventor 杨娟周向阳唐晶晶刘宏专伍上元娄世菊邹幽兰
Owner CENT SOUTH UNIV
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