Preparation method of aqueous adhesive for lithium-ion batteries

A technology for water-based binders and lithium-ion batteries, which can be used in non-polymer binder additives, secondary batteries, battery electrodes, etc. Issues such as weak force of active materials

Inactive Publication Date: 2017-05-31
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when this binder is used on various new electrode materials with high specific capacity, the effect is not satisfactory. The main problem is that the mechanical strength of the binder is insufficient to effectively maintain the structural stability of the active material; At the same time, the weak force between the binder and the active material makes it difficult to inhibit the detachment of the material from the electrode surface
In addition, polyvinylidene fluoride (PVDF) is only soluble in specific solvents such as N-methylpyrrolidone (NMP), which increases the cost of electrode production, and the solvent volatilized during the production process is harmful to the human body

Method used

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  • Preparation method of aqueous adhesive for lithium-ion batteries
  • Preparation method of aqueous adhesive for lithium-ion batteries
  • Preparation method of aqueous adhesive for lithium-ion batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare aluminum sulfate to make aluminum ion concentration 1.8mmol L -1 aqueous solution as a crosslinking agent. Weigh 0.02 g of sodium alginate and 1 mL of cross-linking agent in a weighing bottle and stir and mix until a uniform, transparent gel is formed. Weigh 0.06g of nano-silicon and 0.02g of acetylene black, grind and mix them in a mortar until they are uniform, then transfer them to a weighing bottle and mix them with the gel obtained before, and keep stirring for 6-12 hours until a homogeneous slurry is formed. Cut the copper foil with a thickness of 15 μm into copper sheets with a diameter of 12 mm, wash with 10 wt % hydrochloric acid, deionized water, and acetone in sequence and dry under vacuum at room temperature. Then weigh and record the mass of each copper sheet. The resulting homogenate was uniformly coated on the above-mentioned copper sheet, and then vacuum-dried at 80° C. for 10 h. The pole pieces obtained after drying were weighed and transferr...

Embodiment 2

[0028] Different from Example 1 is that barium chloride is mixed with barium ion concentration 1.8mmol L -1 aqueous solution as a crosslinking agent.

Embodiment 3

[0030] Barium chloride was formulated to have a barium ion concentration of 1.8mmol L -1 aqueous solution as a crosslinking agent. Weigh 0.02 g of sodium alginate and 1 mL of cross-linking agent in a weighing bottle and stir and mix until a uniform, transparent gel is formed. Weigh the lithium-rich manganese-based cathode material Li 1.16 mn 0.6 Ni 0.12 co 0.12 o 2 0.16g and 0.02g of BP 2000 were ground and mixed in a mortar until uniform, then transferred to a weighing bottle and stirred and mixed with the gel obtained before, and kept stirring for 6-12 hours until a homogeneous slurry was formed. Aluminum foil with a thickness of 20 μm was cut into aluminum sheets with a diameter of 12 mm, washed with 10 wt % oxalic acid solution, deionized water, and acetone in sequence, and then dried. Then weigh and record the mass of each aluminum sheet. The resulting homogenate was uniformly coated on the above-mentioned aluminum sheet, and then vacuum-dried at 100° C. for 10 h....

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Abstract

The invention relates to a preparation method of aqueous adhesive for lithium-ion batteries, relates to an energy-storage battery and provides a preparation method of aqueous adhesive for lithium-ion batteries which is high in strength, low in cost, green and environment-friendly, and simple to prepare. The aqueous adhesive is prepared by mixing and stirring sodium alginate and a crosslinking agent and forming gel via crosslinking reaction. The aqueous adhesive is high-strength aqueous adhesive for lithium-ion batteries. The hardness of thin film of the adhesive is multiplied, which helps reduce the surface fracturing chance of an electrode with the adhesive of the invention during charge-discharge cycle, so that the cycle performance of the electrode is improved.

Description

technical field [0001] The invention relates to an energy storage battery, in particular to a preparation method of an aqueous binder for a lithium ion battery. Background technique [0002] Lithium-ion batteries are widely used as energy storage devices for various portable electronic devices in daily life because of their advantages such as high average output voltage, high specific energy, small self-discharge, and no memory effect. In recent years, as consumers' demand for higher energy density lithium-ion batteries continues to increase, people's research on high specific capacity electrode materials is also increasing year by year. However, in the research of these high specific capacity electrode materials, there are often some challenges. For example, the negative electrode materials with high theoretical specific capacity, such as silicon and tin, are easy to break and pulverize due to the huge volume change during the charging and discharging process. The battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J105/04C09J11/04C08J3/075H01M4/62H01M10/0525
CPCC08J3/075C08J2305/04C08K3/16C08K3/30C08K2003/162C08K2003/3081C09J11/04C09J105/04H01M4/622H01M10/0525Y02E60/10
Inventor 李君涛巫展宇孙世刚黄令
Owner XIAMEN UNIV
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