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Water-soluble three-dimensional network type electrode binding agent and preparation method thereof, electrode piece and preparation method thereof, and electrochemical devices

A three-dimensional network, water-soluble technology, applied in electrode manufacturing, battery electrodes, circuits, etc., can solve the problems of long-term cycle performance and high-rate charge-discharge performance of batteries, poor mechanical properties of electrode sheets, and poor long-distance connectivity. , to achieve the effect of small irreversible capacity loss, small side reaction and high specific energy

Active Publication Date: 2011-08-03
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the long-range bonding properties of point-type binders, point-type binders are usually used in conjunction with water-soluble CMC linear binders. This composite binder uses water as the medium of the slurry, no environmental pollution, and a low price It is also relatively low and has been widely used in recent years. However, due to poor long-distance connectivity, electrode sheets prepared with point-type adhesives usually have poor mechanical properties, mainly manifested in low tensile strength and these The inert binder particles SBR and PTFE have high resistance, which is not good for the long-term cycle performance and high-rate charge-discharge performance of the battery

Method used

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  • Water-soluble three-dimensional network type electrode binding agent and preparation method thereof, electrode piece and preparation method thereof, and electrochemical devices
  • Water-soluble three-dimensional network type electrode binding agent and preparation method thereof, electrode piece and preparation method thereof, and electrochemical devices
  • Water-soluble three-dimensional network type electrode binding agent and preparation method thereof, electrode piece and preparation method thereof, and electrochemical devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045](1) Sodium alginate polyelectrolyte is dissolved in water, the concentration is 2%, fully stirred to obtain uniform water-soluble polyelectrolyte aqueous solution;

[0046] (2) In the aqueous solution of sodium alginate, add Ca 2+ aqueous solution, such as CaNO 3 , CaCl 2 Aqueous solution, where Ca 2+ The molar ratio to the carboxyl group in sodium alginate is 0.08, stir for 2 to 4 hours to make Ca 2+ By building bridges between polyelectrolyte molecular chains, the viscosity of the system increases by 2 to 3 times;

[0047] (3) form three-dimensional network type alginic acid polymer hydrosol by cross-linking, that is, the water-soluble three-dimensional network type binder of the present invention and spherical graphite electrode active material are mixed and pulped, and the dry weight of the control cross-linked alginic acid macromolecule is electrode 5% of the total weight, fully stirred to make the slurry fully mixed evenly;

[0048] (4) adjust the viscosity of...

Embodiment 2

[0052] (1) sodium pectate polyelectrolyte is dissolved in water, concentration is 4%, fully stirs to obtain uniform water-soluble polyelectrolyte aqueous solution;

[0053] (2) Add Cu containing Cu to the aqueous solution of sodium pectate 2+ aqueous solution, such as CuNO 3 , CuCl 2 aqueous solution, wherein the molar ratio of Cu ions to pectinic acid active groups is 0.12, stirred for 2 to 4 hours to make Cu 2+ By building bridges between polyelectrolyte molecular chains, the viscosity of the system increases by 2 to 3 times;

[0054] (3) form three-dimensional network type sodium pectate macromolecular hydrosol by crosslinking namely water-soluble three-dimensional network type binding agent of the present invention and spherical graphite electrode active material mix pulping, control crosslinking sodium pectate macromolecule The dry weight is 6% of the total weight of the electrode, stir well to make the slurry fully mixed evenly;

[0055] (4) adjust the viscosity of s...

Embodiment 3

[0059] (1) Sodium gellan gumate polyelectrolyte is dissolved in water, the concentration is 3%, fully stirred to obtain a uniform water-soluble polyelectrolyte aqueous solution;

[0060] (2) Add polydimethyldiallyl ammonium chloride in the aqueous solution of sodium gellan gum acid, the molar ratio of polydimethyldiallyl ammonium chloride and sodium pectate active group is 0.05, stir For 2 to 4 hours, the polydimethyldiallylammonium chloride bridges the polyelectrolyte molecular chains, and the viscosity of the system increases by 2 to 3 times;

[0061] (3) cross-linking to form a three-dimensional network type sodium gellanate macromolecule hydrosol and spherical graphite electrode active material mixed slurrying, control the dry weight of the crosslinked sodium gellanate macromolecule to be 5% of the total weight of the electrode, fully Stir to fully mix the slurry evenly;

[0062] (4) adjust the viscosity of slurry, control the viscosity of slurry at 900 centipoise;

[00...

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Abstract

The invention discloses a water-soluble three-dimensional network type electrode binding agent, comprising a water-soluble polymer polyelectrolyte. Molecular chains of the polyelectrolyte contain active groups; the molecular chains of the polyelectrolyte are cross-linked and bridged by a cross-linking agent to form a three-dimensional network type molecular structure. The invention also disclosesa preparation method of the binding agent, an electrode piece prepared by utilizing the binding agent, and electrochemical devices. In the water-soluble three-dimensional network type electrode binding agent disclosed by the invention, the water solubility is good, the viscosity is adjustable, and the tensile strength and the Young modulus are controllable; in the carbon electrode piece prepared by the electrode binding agent, the mechanical property is good, the phenomenon of common material falling of the electrode piece can be avoided, the irreversible capacity is low in the first chargingprocess, the reversible capacity is high, and electrochemical devices such as lithium-ion batteries and super capacitors and the like with excellent circulating performance can be manufactured.

Description

technical field [0001] The present invention relates to an electrode binder and its composition and optimization method for producing carbon electrode sheets with excellent performance, especially, the present invention relates to the preparation of high-performance electrode sheets using a water-soluble three-dimensional network binder and the use of such electrode sheets to prepare electrochemical device. Background technique [0002] Binder is of great significance in modern electrochemical devices, and is one of the important components in the process of making and using electrode sheets. It not only closely connects the electrode active materials, but also the mechanical properties and electrochemical stability of the binder itself have a significant impact on the overall performance of the battery. [0003] From the perspective of electrode sheet preparation, ordinary electrode sheets usually require 5 to 15% (weight ratio) of binder. On the one hand, the price of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/04
CPCY02E60/12Y02E60/10
Inventor 郑洪河石桥毛玉华覃九三
Owner SHENZHEN CAPCHEM TECH CO LTD
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