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Lithium-ion battery silicon negative electrode water-based binder and preparation method of silicon negative electrode

A water-based adhesive, lithium-ion battery technology, applied in conductive adhesives, battery electrodes, adhesive types, etc., can solve problems such as restricting commercial applications, damage to the conductive network inside electrodes, material particle pulverization, etc. Achieve excellent electrochemical performance, stable cycle performance and good electrical conductivity

Active Publication Date: 2015-08-26
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, silicon exhibits a huge volume change during charging and discharging, which easily leads to the pulverization of material particles and the destruction of the conductive network inside the electrode, which limits its commercial application.

Method used

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  • Lithium-ion battery silicon negative electrode water-based binder and preparation method of silicon negative electrode
  • Lithium-ion battery silicon negative electrode water-based binder and preparation method of silicon negative electrode
  • Lithium-ion battery silicon negative electrode water-based binder and preparation method of silicon negative electrode

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Experimental program
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Effect test

Embodiment 1

[0021] The first aspect of this embodiment relates to a water-based binder for silicon negative electrodes of lithium-ion batteries, the water-based binder is carbonylated β-cyclodextrin;

[0022] The second aspect of this embodiment relates to a method for preparing a silicon negative electrode, the preparation method comprising the following steps:

[0023] Step 1: Add 1g of β-cyclodextrin to 5g of 10wt% H 2 o 2 In an aqueous solution, keep warm at 50°C for 48 hours to form a carbonylated β-cyclodextrin aqueous solution, adjust the pH to 7 with LiOH, and then dry to remove water and hydrogen peroxide to obtain a carbonylated β-cyclodextrin;

[0024] Step 2: Evenly disperse silicon material (particle size: 200nm), carbonylated β-cyclodextrin, and acetylene black in water at a mass ratio of 60:20:20, and then coat it on a copper current collector. After drying, a A silicon negative electrode for lithium-ion batteries.

[0025] Implementation effect: use metal lithium as the...

Embodiment 2

[0027] The first aspect of this embodiment relates to a water-based binder for silicon negative electrodes of lithium-ion batteries, and the water-based binder is gum arabic;

[0028] The second aspect of this embodiment relates to a method for preparing a silicon negative electrode, the preparation method comprising the following steps:

[0029] Silicon material (porous silicon, particle size of 10 μm), gum arabic, and mesophase carbon microspheres are uniformly dispersed in water at a mass ratio of 20:40:40, and then coated on a copper current collector, and dried to obtain a lithium ion Silicon negative electrodes for batteries.

[0030] Implementation effect: use metal lithium as the counter electrode to form a half-cell. When gum arabic is used as the water-based binder, the lithium-ion battery silicon negative electrode has a first-time discharge specific capacity of 3193.7mAh / g under 0.05C discharge conditions, a charge specific capacity of 2515.2mAh / g, and an initial ...

Embodiment 3

[0032] The first aspect of this embodiment relates to a water-based binder for the silicon negative electrode of a lithium ion battery, the water-based binder is poly 3,4-ethylenedioxythiophene: polystyrene sulfonate;

[0033] The second aspect of this embodiment relates to a method for preparing a silicon negative electrode, the preparation method comprising the following steps:

[0034] Silicon material (particle size is 1 μm), poly 3,4-ethylenedioxythiophene: polystyrene sulfonate (wherein the mass ratio of poly 3,4-ethylenedioxythiophene to polystyrene sulfonate is 1:10) the two components are evenly dispersed in water at a mass ratio of 98:2, and then coated on a copper current collector, and dried to obtain a silicon negative electrode for a lithium ion battery.

[0035] Implementation effect: use metal lithium as the counter electrode to form a half-cell. When adopting poly 3,4-ethylenedioxythiophene: polystyrene sulfonate as water-based binder, lithium-ion battery sil...

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Abstract

The invention discloses a water-based adhesive used in a silicon anode of a lithium ion battery and a preparation method of the silicon anode. The adhesive is one or more than one mixture of carbonylation Beta-cyclodextrin, poly 3 and 4-ethylene dioxy thiophene, polystyrene sulfonate and gum arabic. The invention further relates to the preparation method of the silicon anode. The preparation method comprises the following steps: firstly uniformly dispersing a silicon material, the adhesive and conductive carbon in water; and then coating the mixture on a copper collector to obtain a final product of the silicon anode of the lithium ion battery after drying. According to the adhesive, Beta-cyclodextrin is adopted, so that the solubility of the adhesive in water can be improved after the carbonylation treatment of the Beta-cyclodextrin; at the room temperature and under the condition of 0.05 C, the silicon anode starts to charge and discharge, the first time discharge specific capacity can reach up to 4440.2 mAh / g, the charging specific capacity can reach up to 3238.7 mAh / g, the charge and discharge efficiency is 72.9 percent, the charge and discharge specific capacity in one hour is 1770 mAh / g, and the cycle performance is very stable. The water-based adhesive and the silicon anode provided by the invention have the advantages of low costs, environmental friendliness, obvious effects, good conductivity, good recycling and good application prospects.

Description

technical field [0001] The invention relates to a binder for batteries, in particular to a water-based binder for silicon negative poles of lithium ion batteries and a preparation method for silicon negative poles. Background technique [0002] Binders are an important part of the positive and negative electrodes of chemical power sources, and have a great impact on the performance of the electrodes and even the entire battery, such as capacity, cycle life, internal resistance, and voltage during fast charging. Commonly used binders in lithium-ion battery electrode materials include polyvinylidene fluoride (PVDF) with N-methyl-pyrrolidone (NMP) as a solvent, polytetrafluoroethylene (PTFE), sodium carboxymethyl cellulose ( CMC) and styrene-butadiene rubber (SBR) latex and other water-soluble adhesives. [0003] At present, graphite is mainly used as the negative electrode material of commercialized lithium-ion batteries. However, the theoretical specific capacity of graphite...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J105/16C09J165/00C09J125/08C09J193/00C09J9/02H01M4/62H01M4/134H01M4/1395H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 王久林贾灏杨军
Owner SHANGHAI JIAOTONG UNIV
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