Multielement functional modified polymer binder for lithium ion battery and application of binder in electrochemical energy storage device

A polymer binder, lithium-ion battery technology, used in electrochemical generators, battery electrodes, polysaccharide binders, etc. Insufficient junction strength and elasticity, limited use range, etc., to achieve the effect of reducing electrochemical interface impedance, improving uniformity and flatness, and good elasticity

Active Publication Date: 2016-08-31
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Styrene-butadiene rubber (SBR)/sodium carboxymethylcellulose (CMC) and polyacrylate water-based binders have been used in large-scale markets, but their adhesion, flatness of the pole piece and the effect of inhibiting the expansion of the pole piece are limited, so its scope of use is subject to certain restrictions
PVA as an emulsifier, copolymerization of styrene monomer and acrylate monomer (CN105261759A) can prepare water-based binder for lithium-ion batteries, but

Method used

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  • Multielement functional modified polymer binder for lithium ion battery and application of binder in electrochemical energy storage device
  • Multielement functional modified polymer binder for lithium ion battery and application of binder in electrochemical energy storage device
  • Multielement functional modified polymer binder for lithium ion battery and application of binder in electrochemical energy storage device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] (1) First, dissolve 1g of sodium carboxymethylcellulose in 50ml of deionized water (DI-Water) in advance, and fully stir under an argon atmosphere for 0.5 to 2.5 hours to drive off oxygen to obtain a uniform and dispersible solution; The stirring speed is 100~500 rpm;

[0054] (2) Weigh 0.1g (NH 4 ) 2 S 2 O 8 The initiator is added to the solution obtained in step (1), and fully stirred to obtain a mixed solution; then 2.5g of acrylic acid monomer is added, the reaction temperature is adjusted to 55°C, the stirring state is kept, constant temperature reaction for 2.5h, and a transparent uniform glue solution is obtained. It is a multifunctional modified polymer lithium-ion battery binder; the solid content is 6.5wt%, the viscosity is 164.5mPa.s, see Table 1, and the infrared spectrum is shown figure 1 .

Embodiment 2

[0056] Referring to Example 1, the difference is that the monomers added are 2.5 g acrylic acid and 0.84 g acrylonitrile. The initiator used is 0.1g (NH 4 ) 2 S 2 O 8 / 0.03g NaHSO 3 , A light white and slightly transparent emulsion is obtained, which is a binder for multifunctional modified polymer lithium ion batteries, with a solid content of 8wt% and a viscosity of 432.1mPa.s. See Table 1, and for its infrared spectrum figure 1 .

Embodiment 3

[0058] Referring to Example 1, the difference is that the monomers added are 2.5 g acrylic acid, 0.84 g acrylonitrile and 1 g acrylamide. The initiator used is 0.1g (NH 4 ) 2 S 2 O 8 / 0.03g NaHSO 3 , The reaction temperature is 60 ℃, a transparent white emulsion is obtained, which is the binder of multi-functional modified polymer lithium ion battery, the solid content is 9.6% by weight, the viscosity is 1377.4 mPa.s, see Table 1, its infrared Spectrogram see figure 2 .

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Abstract

The invention discloses a multielement functional modified binder for a polymer lithium ion battery. The binder takes a biomass polymer or a synthetic polymer as the substrate, takes a hydrophilic monomer and an oleophilic monomer as the functional modified monomer; and then the binder is prepared through a free radical graft copolymerization reaction or a Michael addition reaction in a modification manner. The binder has a multi-branch structured three-dimensional space network body, so that more active sites in contact with the electrode active material can be provided, and the uniformity and the smoothness of the electrode slurry in film-forming can be improved; the peeling strength of the active materials and the conductive agent on the metal substrate is reinforced; and meanwhile, the binder is excellent in elasticity and binding force, can be applied to water/organic solvent and can be applied to the positive electrode and negative electrode of the lithium ion battery; the conduction of electrons/ions in the charging-discharging process can be promoted; the electrochemical interface impedance of the pole piece is lowered; the high rate capacity and the cycling stability of the positive electrode material and the negative electrode material of the lithium battery are relatively improved; in addition, the synthetic raw material is wide in source, so that the cost can be obviously lowered; and therefore, the binder has a wide market prospect.

Description

Technical field: [0001] The invention relates to a polymer lithium ion battery binder, in particular to a multifunctional modified polymer lithium ion battery binder and its application in electrochemical energy storage devices. Background technique: [0002] In the battery manufacturing process, it is necessary to use a binder to bond the powder electrode active material. As an important inactive component of a lithium-ion battery, the binder adheres the electrode active material and the conductive agent to the current collector, and its performance directly affects the electrochemical performance of the battery. In addition to the role of bonding between the electrode active material, the conductive agent and the current collector, the binder should have sufficient elasticity to prevent the active material particles from swelling due to their own expansion and contraction during battery charging and discharging. Shedding, and facilitates the conduction of electrons and ions du...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/13H01M10/0525
CPCH01M4/13H01M4/622H01M10/0525C08F251/02C09J105/16C08L71/02H01M4/133H01M4/131C09J105/00C09J101/08C09J103/04Y02E60/10C08F220/06C08F220/44C08F220/56C08F220/14C08F212/08C09J151/00C09J151/02C08F255/10C08F283/06C08F220/54C08F218/08C08F236/06C08K3/28C08K3/30C08K5/23C08K2003/285C08K2003/3045C08L1/286C08L47/00C08L51/02C08L79/02
Inventor 张灵志何嘉荣汪靖伦苏静
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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