Lithium-sulfur battery cathode material capable of restricting polysulfide dissolution, electrode slice and battery

A lithium-sulfur battery and positive electrode material technology, applied in the field of lithium-ion batteries, can solve the problems of low specific capacity of composite materials, limiting the specific capacity of carbon-sulfur composite positive electrode materials, etc., and achieve high specific capacity, excellent cycle stability, and good cycle stability sexual effect

Active Publication Date: 2015-04-15
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the pore volume of microporous carbon is small, and the weight ratio of composite sulfur generally does not exceed 45wt%, which limits the overall specific capacity of the carbon-sulfur composite cathode material, resulting in a low specific capacity of the composite material.

Method used

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  • Lithium-sulfur battery cathode material capable of restricting polysulfide dissolution, electrode slice and battery
  • Lithium-sulfur battery cathode material capable of restricting polysulfide dissolution, electrode slice and battery
  • Lithium-sulfur battery cathode material capable of restricting polysulfide dissolution, electrode slice and battery

Examples

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Embodiment 1

[0027] Lithium-sulfur battery positive electrode material is composed of porous carbon and sulfur, in which the porous carbon has a "shell-core" structure, the inner "core" structure is an ordered mesoporous carbon with a pore size of 10nm, and the outer "shell" structure It is microporous carbon with a pore diameter of 0.4nm, sulfur is evenly distributed in the porous carbon, and the mass ratio of porous carbon to sulfur is 5:5.

[0028] figure 1 It is the SEM figure of the porous carbon in embodiment 1, can see mesoporous carbon structure (see figure 1 The exterior of b) is covered with a certain thickness of microporous carbon structure (see figure 1 A) shows that the microporous carbon structure is uniformly coated on the outside of the mesoporous carbon structure, forming the porous carbon with a core-shell structure provided by the present invention. figure 2 It is the TEM figure of embodiment 1, can see ordered mesoporous carbon structure (see figure 2 The exterior...

Embodiment 2

[0031] Lithium-sulfur battery positive electrode material is composed of porous carbon and sulfur, in which the porous carbon has a "shell-core" structure, the inner "core" structure is disordered mesoporous carbon with a pore size of 8nm, and the outer "shell" structure It is a microporous carbon with a pore diameter of 0.5nm, sulfur is evenly distributed in the porous carbon, and the mass ratio of porous carbon to sulfur is 4:6. The cathode material of the lithium-sulfur battery was made into an electrode sheet according to the same process as in Example 1, and the electrode sheet was assembled into a lithium-sulfur battery according to the same process as in Example 1.

Embodiment 3

[0033] Lithium-sulfur battery cathode material is composed of porous carbon and sulfur composite, in which the porous carbon has a "shell-core" structure, the inner "core" structure is an ordered mesoporous carbon with a pore size of 9nm, and the outer "shell" structure It is a microporous carbon with a pore diameter of 0.3nm, sulfur is evenly distributed in the porous carbon, and the mass ratio of porous carbon to sulfur is 7:3. The cathode material of the lithium-sulfur battery was made into an electrode sheet according to the same process as in Example 1, and the electrode sheet was assembled into a lithium-sulfur battery according to the same process as in Example 1.

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Abstract

The invention discloses a lithium-sulfur battery cathode material, and belongs to the technical field of lithium-ion batteries. The lithium-sulfur battery cathode material of the present invention is compounded by porous carbon and sulfur. The porous carbon is composed of an internal core and an external shell. The internal core is of a mesoporous carbon structure. The external shell is of a micro porous carbon structure. The sulfur is filled in the holes of the mesoporous carbon structure and the micro porous carbon structure. The invention also provides an electrode slice and a battery based on the cathode material. The mesoporous structure in the porous carbon has a large pore volume, and can support sulfur of a large weight. The micro porous structure of the outer layer of porous carbon carries sulfur of small molecules. Thus the porous carbon can effectively prevent dissolution of polysulfides in the charge-discharge process, and has excellent cycle stability when the cathode material is ensured to have a high specific capacity.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to a lithium-sulfur battery cathode material, an electrode sheet and a battery. Background technique [0002] With the development of technologies such as electric vehicles, the capacity requirements of individual batteries are getting higher and higher, and the capacity of existing cathode materials can no longer meet the needs of practical applications, which has become the main "bottleneck" that limits the energy density of lithium-ion batteries. The theoretical specific capacity of elemental sulfur is 1675mAh / g. Using sulfur as the positive electrode material of lithium-ion batteries can make the theoretical energy density of the battery reach 2600W / kg, which is enough to meet the needs of applications such as electric vehicles. Therefore, lithium-sulfur batteries using sulfur-containing composites as cathodes have become a research hotspot in recent years. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/38H01M4/133H01M10/052
CPCY02E60/122Y02E60/10
Inventor 李真袁利霞黄云辉蒋妍易梓琦孙永明刘阳何敏
Owner HUAZHONG UNIV OF SCI & TECH
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