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Electrode binding agent of novel lithium ion battery and preparation method of electrode binding agent

A lithium-ion battery and binder technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of unsuitable application of positive electrodes, limited scope of application, lack of elasticity, etc., and achieve small electrode polarization and binder The effect of low interface impedance and high capacity retention

Active Publication Date: 2018-08-17
MINNAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CMC and PAA still have the problems of large modulus and lack of elasticity. Existing research mostly uses a variety of electrode binder compounding methods, such as compounding styrene-butadiene latex (SBR) with CMC to form a new electrode bond. agent system, but because SBR contains an internal double bond structure, it is easily oxidized, so it is not suitable for positive electrodes, which limits its scope of application.

Method used

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  • Electrode binding agent of novel lithium ion battery and preparation method of electrode binding agent
  • Electrode binding agent of novel lithium ion battery and preparation method of electrode binding agent
  • Electrode binding agent of novel lithium ion battery and preparation method of electrode binding agent

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preparation example Construction

[0051] (3) Preparation of electrodes

[0052] With super P li as the conductive agent, lithium iron phosphate (LiFePO 4 ) and nano-silicon (Si) as the active material, (meth)acrylic acid-acrylate block copolymer (PAr-b-PAA-b-PAr) as the electrode binder, dioxane and deionized water as the dispersed Medium, according to the mass ratio of lithium iron phosphate electrode LiFePO 4 : super P li: AA-b-Ar=8:1:1, silicon electrode mass ratio Si: super P li: PAr-b-PAA-b-PAr=6.3: 2.2: 1.5 to prepare electrode slurry, phosphoric acid The lithium iron slurry was coated on aluminum foil, the silicon slurry was coated on copper foil, and dried in a vacuum oven at 120°C.

[0053] (4) Battery assembly and electrochemical performance testing

[0054] a) Battery assembly

[0055] The battery assembly uses lithium iron phosphate electrode and silicon electrode as the positive electrode, and the negative electrode is lithium sheet. Celgard2400 separator and LB315 electrolyte are used to asse...

Embodiment 1

[0061] The present embodiment provides a kind of electrode binder of novel lithium ion battery, and its structural formula is

[0062] R-AA n1 -b-MA n2 -b-AA n3 -X, the molecular weight of the designed polymer is 15K-30K-15K.

[0063] (1) 0.5 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (1) and 0.05 parts by weight of BPO are stirred and dissolved in 80 parts by weight of dioxane, and then 20 parts by weight of acrylic acid monomer ( AA) was poured into the reactor and stirred and mixed, and deoxygenated with nitrogen at room temperature for 5 minutes, then the reaction temperature was raised to 80°C, kept stirring, and after polymerization for 3 hours, R-AA was obtained n1 -X polymer solution;

[0064] (2) After the first step of reaction is completed, add 40 parts by weight of MA monomer and 80 parts by weight of dioxane dissolved with 0.05 parts by weight of BPO, pass nitrogen to remove oxygen for 5 minutes at ro...

Embodiment 2

[0072] This embodiment provides a novel lithium-ion battery electrode binder, its structural formula is: R-AA n1 -b-MA n2 -b-AA n3 -X, the molecular weight of each section is designed to be 81K-18K-81K:

[0073] (1) 0.1 parts by weight of amphiphilic macromolecular reversible addition fragmentation chain transfer reagent (2) and 0.005 parts by weight of V501 are stirred and dissolved in 80 parts by weight of dioxane, and then 20 parts by weight of acrylic acid monomer ( AA) was poured into the reactor and stirred and mixed, and deoxygenated with nitrogen at room temperature for 30 minutes, then the reaction temperature was raised to 60°C, kept stirring, and after polymerization for 20 hours, R-AA was obtained n1 -X polymer solution;

[0074] (2) After the first step reaction, add 5 parts by weight of MA monomer and 20 parts by weight of dioxane dissolved with 0.005 parts by weight of V501, pass nitrogen to remove oxygen for 30 minutes at room temperature, then raise the tempe...

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Abstract

The invention discloses an electrode binding agent of a novel lithium ion battery. The electrode binding agent is an ABA-type three-block polymer, wherein polyacrylic acid blocks are arranged at two ends, a polyacrylate block is arranged at a middle part, each polyacrylic acid block is formed by polymerizing a methacrylic acid monomer and / or an acrylic acid monomer, and the polyacrylate block is formed by polymerizing one or more of methyl acrylate, butyl acrylate, hydroxyethyl acrylate and hydroxypropyl acrylate. The invention also discloses a preparation method for the electrode binding agent of the novel lithium ion battery. The block copolymer binding agent provided by the invention is small in electrode polarization and high in discharging specific capacity, the capacity retention ratio during the circulation process is high, and the binding agent is small in interface impedance, can be simultaneously applicable to a positive electrode and a negative electrode and has huge application prospect in the field of the lithium ion battery.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a novel electrode binder for lithium ion batteries and a preparation method thereof. Background technique [0002] Since the advent of lithium-ion batteries, they have been widely used in electric vehicles, portable electronic products and other fields due to their advantages such as high specific capacity, long cycle life, and small self-discharge. For a long time, the battery life of portable electronic products is insufficient, and the capacity decays too fast. These problems are closely related to the active material, electrode structure, electrode binder, etc. in lithium-ion batteries. Among them, although the electrode binder only accounts for a small part of the electrode system, it occupies an important position and has a direct impact on the charge and discharge rate and cycle performance of the battery. [0003] The role of the electrode binder is to bind the acti...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/0525C08F293/00
CPCC08F293/005C08F2438/03H01M4/622H01M10/0525Y02E60/10
Inventor 黄杰黄静芳李明君
Owner MINNAN NORMAL UNIV
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