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Hierarchical porous pole piece and preparation method and application thereof

A layered and pole piece technology, applied in the field of lithium ion battery pole piece and its preparation, can solve the problems of pole piece active material falling off, affecting the pole piece bonding performance, etc., to increase liquid absorption, ensure energy density, and increase energy effect of density

Active Publication Date: 2020-08-04
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method of mixing solvents can use the volatilization of the solvent to create pores, due to the uniform distribution of the solvent, it will affect the bonding performance of the pole piece during the evaporation process, and it is easy to cause the active material on the pole piece to fall off.

Method used

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  • Hierarchical porous pole piece and preparation method and application thereof
  • Hierarchical porous pole piece and preparation method and application thereof
  • Hierarchical porous pole piece and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] LiFePO 4 , PVDF, acetylene black, and NMP agent are mixed according to 8:1:1, and 0.8% (as LiFePO 4 , PVDF, the total weight of acetylene black as a benchmark) has an average particle size of 1000nm elemental sulfur powder (particle size standard deviation σ=5nm). Mix evenly to be slurry A (in slurry A, NMP content is 70wt.%);

[0098] LiFePO 4 , PVDF, acetylene black, and NMP agent are mixed according to 8:1:1, and 1.5% (as LiFePO 4 , PVDF, the total weight of acetylene black as a basis) has an average particle size of 100nm elemental sulfur powder (particle size standard deviation σ=5nm). Mix evenly to form slurry B (in slurry B, the NMP content is 70wt.%).

[0099] Coat the slurry A on the aluminum foil, control the coating thickness to 20 μm, and dry at 110°C for 3 hours; after drying, apply the slurry B on the pole piece, control the coating thickness to 60 μm, set Dry at 110°C for 3 hours; after drying, compact it, then place the pole piece at 180°C and dry f...

Embodiment 2

[0103] LiCoO 2 , PVDF, acetylene black, and NMP agent are mixed according to 9:0.5:1, and 0.5% (as LiCoO 2 , PVDF, the total weight of acetylene black as a basis) has an average particle size of 700nm elemental sulfur powder (standard deviation of particle size σ=5nm). Mix evenly to be slurry A (in slurry A, NMP content is 72wt.%);

[0104] LiCoO 2 , PVDF, acetylene black, and NMP agent are mixed according to 9:0.5:1, and 2% (as LiCoO 2 , PVDF, the total weight of acetylene black as a basis) has an average particle size of 10nm elemental sulfur powder (standard deviation of particle size σ=5nm). Mix evenly to form slurry B (in slurry B, the NMP content is 72wt.%).

[0105] Coat the slurry A on the aluminum foil, control the coating thickness to 10 μm, and dry at 80°C for 3 hours; after drying, apply the slurry B on the pole piece, control the coating thickness to 100 μm, and place Dry at 80°C for 3 hours; after drying, compact it, then place the pole piece at 200°C and dr...

Embodiment 3

[0108] LiFePO 4 , PVDF, carbon nanotubes, and NMP agent are mixed according to 9:1:1, and 1.5% (as LiFePO 4 , PVDF, based on the total weight of carbon nanotubes) with an average particle size of 500nm elemental sulfur powder (standard deviation of particle size σ=5nm). Mix evenly to be slurry A (in slurry A, NMP content is 80wt.%);

[0109] LiFePO 4 , PVDF, carbon nanotubes, and NMP agent are mixed according to 9:1:1, and 1.8% (as LiFePO 4 , PVDF, based on the total weight of carbon nanotubes) with an average particle size of 300nm elemental sulfur powder (standard deviation σ=5nm of particle size). Mix evenly to form slurry B (in slurry B, the NMP content is 80wt.%).

[0110] Coat the slurry A on the aluminum foil, control the coating thickness to 15 μm, and dry at 120°C for 3 hours; after drying, apply the slurry B on the pole piece, control the coating thickness to 80 μm, and place Dry at 120°C for 3 hours; after drying, place the pole piece at 190°C for 50 minutes. ...

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Abstract

The invention discloses a hierarchical porous pole piece and a preparation method thereof. Grading coating and pore forming agent addition are utilized to perform grading regulation and control on thepore structure of the pole piece, thereby enhancing the liquid absorption capacity of the pole piece, ensuring the maximization of the active substances, and ensuring the energy density of the battery on the basis of enhancing the electrochemical properties of the pole piece. The pole piece and a lithium piece are assembled into a button cell, it is proved that the material shows excellent electrochemical performance, the electrode polarization can be effectively reduced, and the energy density and the cycling stability of the cell are improved.

Description

technical field [0001] The invention relates to a lithium-ion battery pole piece and a preparation method thereof, belonging to the field of lithium-ion batteries. Background technique [0002] Energy is an important material basis for developing the national economy and improving people's living standards, and it is also an important factor that directly affects economic development. Since the beginning of the 21st century, problems such as resource shortage, environmental pollution, and greenhouse effect caused by traditional energy utilization methods have become increasingly prominent. Improving the energy structure and developing efficient and clean new energy sources has become a global consensus. Lithium-ion batteries are favored by people because of their superior properties such as safety, environmental protection, high specific energy and good electrochemical performance. In order to improve the electrochemical performance of lithium ions and increase the energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525
CPCH01M4/0404H01M4/043H01M4/0471H01M4/131H01M4/133H01M4/134H01M4/136H01M4/1391H01M4/1393H01M4/1395H01M4/1397H01M10/0525Y02E60/10
Inventor 赖延清张治安王麒羽洪波向前张凯方静
Owner CENT SOUTH UNIV
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