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Hydrophobic modified natural plant polysaccharide aqueous binder and its application in lithium-ion battery anode

A technology of lithium-ion batteries and natural plants, applied in hydrophobically modified natural plant polysaccharide water-based binders and its application in lithium-ion battery negative electrodes, can solve the problem of unstable solid electrolyte film, rapid capacity decay of silicon negative electrodes, Problems such as powdering of active material particles to achieve the effect of improving cycle stability, improving battery cycle performance, and good viscoelasticity

Active Publication Date: 2019-12-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the volume expansion of silicon is as high as 300% in the state of fully intercalating lithium, and the huge volume change will cause the pulverization of active material particles, the formation of unstable solid electrolyte film (SEI) and the destruction of electrode structure, which will lead to the capacity fading of silicon negative electrode. Fast, short cycle life

Method used

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  • Hydrophobic modified natural plant polysaccharide aqueous binder and its application in lithium-ion battery anode
  • Hydrophobic modified natural plant polysaccharide aqueous binder and its application in lithium-ion battery anode
  • Hydrophobic modified natural plant polysaccharide aqueous binder and its application in lithium-ion battery anode

Examples

Experimental program
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Effect test

Embodiment 1

[0070] First, tetradecyl grafted fenugreek gum (FG-R) with a viscosity of 100 mPa.s 14 ) configured as a 0.5 wt% aqueous solution. Weigh 50 mg of nano-Si and 30.0 mg of acetylene black in a mortar, grind for 10 minutes, then add 0.20 g of 0.5 wt% GG-R dropwise 16 aqueous solution. Grind for 5 minutes until the binder is evenly mixed with Si powder and carbon powder, then add 0.5 mL 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 100μm spatula, quickly place it in a blast drying oven at 60°C, and take it out after five minutes. Then put the electrode piece into a vacuum drying oven, and vacuum dry at a constant temperature of 80° C. for 6 hours. After weighing the vacuum-dried electrode pieces, assemble them in the glove box in the 2032 battery case, use the lithium sheet as the positive electrode, use the polyethylene film as the separator, and use 1mol / L LiPF 6 EC / DMC / DEC (v / v / v=1 / 1 / 1) ...

Embodiment 2

[0072] Different from example 1 is to utilize the viscosity to be the myristyl grafted guar gum (GG-R) of 100 mPa.s 14 ) as a binder.

Embodiment 3

[0074] Different from example 1 is the use of viscosity is 100 mPa.s tetradecyl grafted xanthan gum (XG-R 14 ) as a binder.

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Abstract

The invention relates to a hydrophobically modified natural plant polysaccharide water system binder and application thereof in a lithium ion battery cathode. A lithium ion battery cathode material is prepared by means of hydrophobically modified natural plant polysaccharide as shown in a formula 1. The material comprises the following components: an active material, a conductive agent and a bonder in a proportion of (50-80) to (10-30) to (5-20). In order to match silicone fragments in use, by taking the hydrophobically modified natural plant polysaccharide as the bonder on a negative plate, the hydrophobically modified natural plant has a good bonding property, and silicon particles can be embedded into network structures as many as possible through the three-dimensional netty structure and the silicon particles are prevented from being dissociated out of the negative plate if the structure is broken, so that the cycle performance of a battery is enhanced. Moreover, the used novel bonder is wide in source and has water solubility, and is a green and environmental novel bonder.

Description

technical field [0001] The invention relates to the technical field of electrochemistry and new energy materials, in particular to a hydrophobically modified natural plant polysaccharide water-based binder and its application in lithium-ion battery negative electrodes. Background technique [0002] With the use of lithium-ion batteries in hybrid electric vehicles and pure electric vehicles, the demand for lithium-ion batteries with high energy density is increasing. Si-based materials completely intercalate lithium to form Li 22 Si 5 The specific capacity of the alloy is as high as 4200 mAh / g, which is the highest among the currently developed negative electrode materials. However, the volume expansion of silicon is as high as 300% in the state of fully intercalating lithium, and the huge volume change will cause the pulverization of active material particles, the formation of unstable solid electrolyte film (SEI) and the destruction of electrode structure, which will lead...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M10/0525
CPCH01M4/621H01M10/0525Y02E60/10
Inventor 王晨王景涛秋列维杨晓武
Owner SHAANXI UNIV OF SCI & TECH