Novel chitosan used for lithium ion cell and derivative water-based binder of chitosan

A lithium-ion battery and binder technology, applied in the field of new chitosan and its derivatives water-based binder, can solve the problems of air pollution, inability to effectively suppress the volume of Si particles, flammability and explosion, and achieve Wide range of sources, improved battery cycle performance, and low cost effects

Active Publication Date: 2012-10-31
ZHEJIANG CASNOVO MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The traditional organic solvent-based binder polyvinylidene fluoride (PVDF) is easy to absorb the electrolyte and swell, resulting in a decrease in bonding performance, which can not effectively suppress the huge change in the volume of Si particles during charge and discharge.
In addition, although the organic solvent used by PVDF has the characteristics of good dispersion, it is volatile, flammable, explosive, and highly toxic, which seriously pollutes the atmospheric environment.

Method used

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  • Novel chitosan used for lithium ion cell and derivative water-based binder of chitosan
  • Novel chitosan used for lithium ion cell and derivative water-based binder of chitosan
  • Novel chitosan used for lithium ion cell and derivative water-based binder of chitosan

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, the viscosity of 90cps chitosan is configured into a 5wt% aqueous solution containing 1% acetic acid. Weigh 80mg of nano-Si and 38.7mg of acetylene black in a mortar, grind for 10 minutes, and then add 0.2064g of 5% chitosan aqueous solution dropwise. Grind for 5 minutes until the binder is evenly mixed with Si powder and carbon powder, then add 1mL of deionized water dropwise, and then fully grind for 15-10 minutes. Pour the pasty mixture onto the Cu sheet, spread it evenly with a 100 μm spatula, quickly place it in a blast drying oven at 70°C, and take it out after five minutes. Then put the electrode piece into a vacuum drying oven, and dry it in vacuum at a constant temperature of 90° C. for 6 hours. After weighing the vacuum-dried electrode pieces, assemble them in the glove box in the 2025 battery case, use the lithium sheet as the counter electrode, use the polyethylene film as the separator, and use 1MLiPF 6 EC / DMC / DEC (v / v / v=1 / 1) conduct constant curre...

Embodiment 2

[0031] The difference from example 1 is that the chitosan with a viscosity of 300cps is used as the binding agent.

Embodiment 3

[0033] Different from example 1 is to utilize the chitosan that viscosity is 650cps as binding agent.

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Abstract

The invention provides water-soluble chitosan and derivatives thereof which are low in price and environment-friendly and used for replacing traditional PVDF (polyvinylidene fluoride) and CMC (carboxy methylated cellulose), and provides a novel environment-friendly binder of a lithium ion cell electrode material. According to the invention, the initial raw material of a chitosan binder is chitin, the chitin is extracted from crustacean such as carapace and crab shell, thus the source is broad, the cost is cheap, and the chitosan binder is green and has no pollution. The chitin is prepared into chitosan through deacetylation, and the chitosan further can be functionalized to be prepared into carboxylated chitosan, chitosan lactate and the like.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a novel chitosan and its derivative aqueous binder used as positive and negative electrode materials for lithium ion batteries. technical background [0002] The rapid development of various portable electronic devices and electric vehicles urgently requires power systems with high specific capacity, high charge and discharge efficiency, and long cycle life to match them. Lithium-ion batteries are considered to be the most ideal power supply because of their advantages such as high open circuit voltage, high energy density, long service life, no memory effect, less pollution, and low self-discharge rate. [0003] During the development of lithium-ion battery electrode materials, Si-based materials have attracted much attention because they have the highest theoretical lithium intercalation capacity (4200mAh / g, much higher than all other current n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62C08B37/08
CPCH01M4/622C08L5/08H01M10/0525C08B37/003Y02E60/12H01M4/62Y02T10/7011Y02E60/10C08L5/00Y02T10/70
Inventor 张灵志岳鹿仲皓想
Owner ZHEJIANG CASNOVO MATERIALS
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