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Adhesive for nano-silicon carbon anode material of lithium battery and preparation method of adhesive

A nano-silicon and lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., to achieve the effects of improved performance, superior mechanical and processability, high tensile strength and elastic recovery force

Inactive Publication Date: 2018-08-21
中国东方电气集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the volume expansion effect in the silicon intercalation / delithiation process is a major factor limiting the use of silicon materials

Method used

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  • Adhesive for nano-silicon carbon anode material of lithium battery and preparation method of adhesive
  • Adhesive for nano-silicon carbon anode material of lithium battery and preparation method of adhesive
  • Adhesive for nano-silicon carbon anode material of lithium battery and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This embodiment provides a method for making a binder of a silicon-carbon negative electrode material and a negative electrode sheet, including the following steps:

[0024] (1) Add amino-rich phenylalanine dropwise to a solution of polyacrylic acid (PAA), and condense or polycondensate under the action of the initiator and occasional diisobutyronitrile (AIBN) to form a viscous polymer polymer binder;

[0025]

[0026] (2) Mix the silicon carbon negative electrode material with the binder and other auxiliary materials in the above step (1) and apply it on the negative electrode current collector, and dry it, wherein the auxiliary materials include conductive agents and solvents to obtain the negative electrode of the silicon battery piece.

[0027] (3) Use the negative electrode in step (2), use lithium sheet as counter electrode, polyolefin separator and electrolyte LiPF containing organic mixed solvent (EC (ethyl carbonate) + DMC (dimethyl carbonate)) 6 (The con...

Embodiment 2

[0030]This embodiment provides a method for making a binder of a silicon negative electrode material and a negative electrode sheet, comprising the following steps:

[0031] (1) Add tyrosine rich in amino structure dropwise to the solution of polyacrylic acid (PAA), and condense or polycondensate under the action of the initiator occasionally diisobutyronitrile (AIBN) to form a viscous polymer material adhesive;

[0032]

[0033] (2) Mix the silicon carbon negative electrode material with the binder and other auxiliary materials in the above step (1) and apply it on the negative electrode current collector, and dry it, wherein the auxiliary materials include conductive agents and solvents to obtain the negative electrode of the silicon battery piece.

[0034] (3) Use the negative electrode in step (2), use lithium sheet as counter electrode, polyolefin separator and electrolyte LiPF containing organic mixed solvent (EC (ethyl carbonate) + DMC (dimethyl carbonate)) 6 (The...

Embodiment 3

[0037] This embodiment provides a method for making a binder of a silicon-carbon negative electrode material and a negative electrode sheet, including the following steps:

[0038] (1) Add amino-rich histidine dropwise to a polyacrylic acid (PAA) solution, and condense or polycondense under the action of the initiator occasionally diisobutyronitrile (AIBN) to form a viscous polymer material adhesive;

[0039]

[0040] (2) Mix the silicon carbon negative electrode material with the binder and other auxiliary materials in the above step (1) and apply it on the negative electrode current collector, and dry it, wherein the auxiliary materials include conductive agents and solvents to obtain the negative electrode of the silicon battery piece.

[0041] (3) Use the negative electrode in step (2), use lithium sheet as counter electrode, polyolefin separator and electrolyte LiPF containing organic mixed solvent (EC (ethyl carbonate) + DMC (dimethyl carbonate)) 6 (The concentrati...

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Abstract

The invention discloses an adhesive for a nano-silicon carbon anode material of a lithium battery. The high-molecular polymer adhesive is prepared from amino acid containing amino and polymers containing carboxyl or ester by condensation; amino in amino acid is subjected to a reaction with carboxyl in PAA (polyacrylic acid) or ester in polyacrylate and dehydrated to form an amido bond, then a high-molecular polymer with a three-dimensional network structure is formed, and synergistic effect of amino in amino acid and carboxyl is utilized sufficiently, so that the polymer has excellent mechanical property and machinability and high tensile strength and elastic restoring force. The adhesive can effectively limit change of electrode thickness in a lithium-intercalation process, an electrode also has better recovery capability in a lithium separation process, structural stability of the silicon electrode in the lithium separation / intercalation process is effectively kept, and the defect that volume of a silicon pole piece is extremely prone to expanding in a charge-discharge process is overcome.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a binder used for a negative electrode of lithium battery nanometer silicon carbon and a preparation method thereof. Background technique [0002] At present, the lithium-ion batteries used in production mainly use graphite-based negative electrode materials, but the theoretical lithium intercalation capacity of graphite is 372mAh / g. There is almost no room for improvement in the capacity of graphite-based negative electrode materials, which cannot meet the needs of high-energy-density lithium-ion batteries. Development needs; in addition, its lithium intercalation potential is very close to the deposition potential of lithium, which brings a huge safety hazard to the battery. The specific capacity of Li22Si5 alloy is as high as 4200 mAh / g when silicon is completely intercalated with lithium, which is the highest among the currently developed negative el...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08F8/32C08F20/06
CPCC08F8/32H01M4/622H01M10/0525C08F20/06Y02E60/10
Inventor 黄兴兰吴仕明谢皎
Owner 中国东方电气集团有限公司
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