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Flexible package lithium ion battery silicon negative pole and manufacturing method thereof

A lithium-ion battery, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problem of short battery cycle life, and achieve the effect of improving cycle stability and initial charge-discharge efficiency.

Active Publication Date: 2015-01-14
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a soft-packed lithium-ion battery with high tensile capacity in order to solve the defect that the existing silicon-based negative electrode material is accompanied by a huge volume change in the process of lithium ion intercalation and extraction, resulting in a short cycle life of the battery. Silicon-containing negative electrode

Method used

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  • Flexible package lithium ion battery silicon negative pole and manufacturing method thereof
  • Flexible package lithium ion battery silicon negative pole and manufacturing method thereof

Examples

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Effect test

Embodiment 1

[0034] A method for manufacturing a silicon negative electrode of a soft-packed lithium-ion battery, the method comprising the following steps:

[0035] a) Glue compounding: take the binder polyimide powder, add it to the organic solvent of nitrogen methyl pyrrolidone, adjust the solid content of the glue solution to 25%, stir at a slow speed of 1000rpm for 30min;

[0036] b) Add conductive agent: add conductive agent super-p to the glue prepared in step a), and stir rapidly at 4000rpm for 1.5h to obtain conductive liquid;

[0037] c) Add main material: Add silicon negative electrode material to the conductive liquid obtained in step b), stir slowly at 800rpm for 8 minutes, then stir quickly at 3000rpm for 45 minutes, then add artificial graphite, stir slowly at 800rpm for 8 minutes, then add NMP to adjust the solid content 46%, 4000rpm stirred rapidly for 1.5h, then stirred slowly at 900rpm for 20min to obtain a slurry, wherein the mass ratio of silicon to artificial graph...

Embodiment 2

[0044] A method for manufacturing a silicon negative electrode of a soft-packed lithium-ion battery, the method comprising the following steps:

[0045] a) Glue compounding: Take the binder polyimide powder and add it to an organic solvent composed of nitrogen methylpyrrolidone and dimethylacetamide. The volume ratio of nitrogen methylpyrrolidone and dimethylacetamide is 1: 2. Prepare the glue with a solid content of 5%, stir at a slow speed of 800rpm for 40min;

[0046] b) Add conductive agent: add conductive agent super-p to the glue prepared in step a), and stir rapidly at 3000rpm for 2 hours to obtain conductive liquid;

[0047] c) Add main material: Add silicon negative electrode material to the conductive liquid obtained in step b), stir slowly at 800rpm, and then stir quickly at 3000rpm for 60min after 10min, then add hard carbon, stir slowly at 800rpm for 10min, then add NMP to adjust the solid The content is 40%, stirred rapidly at 3500rpm for 2h, then stirred sl...

Embodiment 3

[0054] A method for manufacturing a silicon negative electrode of a soft-packed lithium-ion battery, the method comprising the following steps:

[0055] a) Glue compounding: Take the binder polyimide powder and add it to an organic solvent composed of dimethylacetamide, nitrogen-methylpyrrolidone and dimethylformamide. Dimethylacetamide, nitrogen-methylpyrrolidone The volume ratio to dimethylformamide is 1:2:1, the solid content of the glue solution is 15%, and the mixture is stirred at a slow speed of 1000rpm for 50min;

[0056] b) Add conductive agent: add conductive agent super-p to the glue prepared in step a), and stir rapidly at 4000rpm for 2.5h to obtain conductive liquid;

[0057] c) Add main material: Add silicon negative electrode material to the conductive liquid obtained in step b), stir slowly at 800rpm for 12min, then stir quickly at 3000rpm for 75min, then add natural graphite, stir slowly at 800rpm for 12min, then add NMP to adjust the solid content 60%, 4...

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Abstract

The invention relates to a flexible package lithium ion battery silicon negative pole. The flexible package lithium ion battery silicon negative pole consists of a current collector and an active substance layer coating the surface of the current collector, wherein the active substance layer consists of the following substances in percentage by mass: 10-92 percent of silicon-carbon composite material, 2-70 percent of a conductive agent and 5-20 percent of an adhesive; the adhesive refers to polyimide; the porosity of the active substance layer is 30-65 percent, and the compaction density is 1.1-2.0g / cm<3>. Polyimide is dispersed by adopting a proper solvent, and the adhesive subjected to high-temperature polyacylation treatment has extremely high adhesive force, so that the prepared silicon negative pole piece has ultra-strong tension stress, the structure is kept stable in the repeated lithium-ion embedding and separating process, the first charge-discharge efficiency of the silicon negative pole can be obviously improved, and the cycling stability is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and in particular relates to a high tensile strength soft-pack lithium-ion battery silicon negative electrode and a manufacturing method thereof. [0002] Background technique [0003] With the rapid development of electric vehicles and hybrid electric vehicles, there is a demand for power lithium-ion batteries with higher power density and energy density, suitable for fast charging and discharging, and energy-type lithium-ion batteries with longer battery life. very urgent. The main idea of ​​developing a lithium-ion battery that meets the above requirements is to find new positive and negative electrode materials, so that the battery has a higher lithium intercalation capacity and good delithiation reversibility, so as to ensure the high voltage, large capacity and long cycle life of the battery . The current commercial lithium-ion battery negative electrode uses graphite-based mater...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/62H01M4/1395
CPCH01M4/134H01M4/1395H01M4/622H01M10/0525Y02E60/10
Inventor 石先兴葛民民吕豪杰谭东庆陈军
Owner WANXIANG 123 CO LTD
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