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Application of carrageenan-based binder in lithium-ion battery and corresponding binder

A lithium-ion battery and binder technology, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems that the volume expansion inhibition effect of silicon-based negative electrodes is not obvious, and cannot meet the needs of silicon-based negative electrodes for new binders. , to achieve the effects of improving cycle stability, enhancing bond strength, and improving cycle performance

Inactive Publication Date: 2019-09-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used binders include polyvinylidene fluoride, polytetrafluoroethylene, sodium polyacrylate, sodium alginate, sodium carboxymethyl cellulose, and styrene-butadiene rubber, etc. The inhibition effect is not obvious, and it still cannot meet the needs of silicon-based negative electrodes for new binders

Method used

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  • Application of carrageenan-based binder in lithium-ion battery and corresponding binder
  • Application of carrageenan-based binder in lithium-ion battery and corresponding binder

Examples

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preparation example Construction

[0029] Specifically, based on the present invention, the binder synthesis and pole piece preparation method may include the following steps:

[0030] S1 Dissolving a certain amount of hydrophilic organic matter and / or calcium ion source (such as calcium salt) in a certain amount of water to prepare a binder solution, such as a binder solution with a concentration of hydrophilic organic matter of 50 mg / ml;

[0031] S2 Add carrageenan accounting for 3%-15% mass fraction of hydrophilic organic matter to S1, and fully stir;

[0032] S3 mixes the binder obtained in S2, conductive carbon, and silicon particles in a certain proportion, and grinds them into a slurry.

[0033] S4 uniformly coat the slurry obtained in S3 on the surface of the copper foil, and then place it in a vacuum drying oven to dry.

[0034] S5 uses the pole piece obtained in S4 as the negative electrode of the lithium-ion battery.

[0035] Of course, it is also possible to use only carrageenan to form the binder...

Embodiment 1

[0038] Include the following steps:

[0039] S1: Dissolve 500mg of polyacrylic acid in 10mL of water, add a mixture of 110mg of sodium hydroxide and 15mg of calcium hydroxide, and adjust the pH to neutral.

[0040] S2: Add 15mg of carrageenan to S1 and stir well.

[0041] S3: Take 100 uLS2 of the obtained binder, 5 mg of conductive carbon, and 40 mg of micron silicon, mix and grind to form a slurry.

[0042] S4: The slurry obtained in S3 is evenly coated on the surface of the copper foil, and then placed in a vacuum drying oven at 40°C for 24 hours.

[0043] S5: Cut the pole piece obtained in S4 into small discs with a certain diameter, and use lithium as the counter electrode to assemble it into a battery to measure its performance.

Embodiment 2

[0045] Include the following steps:

[0046] S1: Dissolve 500mg of polyacrylamide in 10mL of water to prepare a 50mg / mL binder.

[0047] S2: Add 30 mg of carrageenan to S1 and stir well.

[0048] S3: Take 150 uLS2 of the obtained binder, 7.5 mg of conductive carbon black, and 35 mg of micron silicon, mix and grind to form a slurry.

[0049] S4: The slurry obtained in S3 is evenly coated on the surface of the copper foil, and then placed in a vacuum drying oven at 60°C for 18 hours.

[0050] S5: Cut the pole piece obtained in S4 into small discs with a certain diameter, and use lithium as the counter electrode to assemble it into a battery to measure its performance.

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Abstract

The invention belongs to the field of binders for lithium-ion batteries and discloses an application of a carrageenan-based binder in a lithium-ion battery and a corresponding binder. The applicationspecifically is the application of the carrageenan-based binder in the lithium-ion battery. The binder comprises carrageenan and is capable of improving the cycling stability of a silicon-containing negative electrode material in the lithium-ion battery. The binder is the binder used for improving the cycling stability of the silicon-containing negative electrode material in the lithium-ion battery and comprises the carrageenan. According to the binder, the cycling stability of the silicon-containing negative electrode material in the lithium-ion battery can be improved through introducing anindividual carrageenan component into the lithium-ion battery or combining the carrageenan component with other components as the binder. Furthermore, the carrageenan component is further combined with a hydrophilic organic matter of the silicon-containing negative electrode material and / or calcium ions for application, so that the cycle performance of silicon as the negative electrode material for the lithium battery can be further improved and the electrochemical property of a negative electrode of a silicon-based lithium battery is improved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery binders, and more specifically relates to the application of carrageenan-based binders in lithium-ion batteries and the corresponding binders. Background technique [0002] Lithium-ion batteries are widely used in portable electronic products and electric vehicles due to their high energy density, good cycle stability, high safety, and environmental friendliness. At present, the negative electrode of lithium-ion batteries is mainly graphite, etc., but the specific capacity of graphite is low (~372mAh / g), which greatly limits the improvement of the energy density of lithium-ion batteries. [0003] Silicon has a higher theoretical specific capacity (4200mAh / g) than graphite, and is considered to be one of the most potential anode materials for next-generation high-energy lithium-ion batteries. However, the silicon material will have a serious volume expansion effect during the charging and discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/60H01M4/134H01M4/38H01M10/0525
CPCH01M4/134H01M4/386H01M4/602H01M10/0525H01M2004/027Y02E60/10
Inventor 张五星陈伟伦薛丽红黄云辉
Owner HUAZHONG UNIV OF SCI & TECH
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