Lithium ion battery composite binder and preparation method and application thereof

A lithium-ion battery and binder technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of increased internal resistance of batteries, reduced service life of lithium batteries, and reduced mobility of molecular segments, and reduced vitrification. temperature, enhancing surface force, avoiding the effect of conductive agent agglomeration

Pending Publication Date: 2022-03-18
JIANGSU TENPOWER LITHIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The polymer whose binder is an insulator will seriously affect the low-temperature performance of the lithium-ion battery due to the decrease in the molecular segment movement ability of the polymer in a low-temperature environment.
[0004] Sodium carboxymethyl cellulose and styrene-butadiene latex are commonly used as binders for negative electrodes of traditional lithium-ion batteries. These two substances have stable chemical properties and electrochemical properties, but in the silicon negative electrode material system, the inhibitory effect on the expansion of silicon particles Weak, leading to SEI film damage, pulverization, and significant increase in impedance, es

Method used

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  • Lithium ion battery composite binder and preparation method and application thereof

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Embodiment 1

[0038] The lithium-ion battery composite binder provided in this embodiment includes binder component A and binder component B, and binder component A is composed of sodium alginate (SA), polyvinyl alcohol (PVA) and polyvinyl alcohol (PVA) Acrylic acid (PAA) is prepared by compounding with carbon nanotube aqueous dispersion liquid after cross-linking reaction; B component of binder is PVA modified rubber emulsion.

[0039] The mass ratio of binder component A to binder component B is 2:1.

[0040] The preparation method of the lithium-ion battery composite binder of the present embodiment comprises the following steps:

[0041]S1. Put 1 part of sodium alginate, 30 parts of acrylic acid and 99 parts of deionized water into a beaker, and stir evenly; after the addition, let the solution stand at -10°C for 12 hours; vacuum degassing to obtain a mixed solution.

[0042] S2. Put 1.3 parts of polyvinyl alcohol and 38 parts of deionized water into a beaker, and stir at 90° C. for 2 hou

Embodiment 2

[0047] The difference between Example 2 and Example 1 is that the mass ratio of the binder component A to the binder component B is 5:1.

[0048] The preparation method of the lithium-ion battery composite binder of the present embodiment comprises the following steps:

[0049] S1. Put 1 part of sodium alginate, 35 parts of acrylic acid and 99 parts of deionized water into a beaker, and stir evenly; after the addition, let the solution stand at -12°C for 12 hours; vacuum defoaming to obtain a mixed solution.

[0050] S2. Put 1.7 parts of polyvinyl alcohol and 50 parts of deionized water into a beaker, and stir at 90° C. for 2 hours to obtain a polyvinyl alcohol solution.

[0051] S3. Mix the solutions of steps S1 and S2 evenly, then add 0.5 parts of ammonium persulfate and 0.5 parts of N,N-methylenebisacrylamide, and react at 80° C. for 4 hours to obtain a SA / PVA / PAA solution.

[0052] S4. Add 375 parts of the carbon nanotube aqueous dispersion to the SA / PVA / PAA solution

Embodiment 3

[0055] The difference between Example 3 and Example 1 is that the mass ratio of the binder component A to the binder component B is 10:1.

[0056] The preparation method of the lithium-ion battery composite binder of the present embodiment comprises the following steps:

[0057] S1. Put 5 parts of sodium alginate, 35 parts of acrylic acid and 99 parts of deionized water into a beaker, and stir evenly; after the addition, let the solution stand at -12°C for 16 hours; vacuum defoaming to obtain a mixed solution.

[0058] S2. Put 2 parts of polyvinyl alcohol and 58 parts of deionized water into a beaker, and stir at 90° C. for 2 hours to obtain a polyvinyl alcohol solution.

[0059] S3. Mix the solutions of steps S1 and S2 evenly, then add 1 part of ammonium persulfate and 1 part of N,N-methylenebisacrylamide, and react at 80° C. for 2 hours to obtain a SA / PVA / PAA solution.

[0060] S4. Add 201 parts of the carbon nanotube aqueous dispersion to the SA / PVA / PAA solution in st

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Abstract

The invention discloses a lithium ion battery composite binder and a preparation method and application thereof, and belongs to the technical field of lithium ion battery materials. Comprising a binder component A and a binder component B. The binder component A is prepared by performing cross-linking reaction on sodium alginate (SA), polyvinyl alcohol (PVA) and polyacrylic acid (PAA) and then compounding with a carbon nanotube aqueous dispersion liquid; the binder B component is PVA (polyvinyl alcohol) modified rubber emulsion; the mass ratio of the binder component A to the binder component B is (2-10): 1. The binder component A has a large number of ester groups and hydroxyl groups, so that the surface acting force of the binder and silicon particles can be enhanced, and the binding power is improved; the composite binder disclosed by the invention has relatively good binding performance, the binding force between an active material in an electrode and a current collector can be improved, the binding force of a pole piece can reach 0.45-0.57 N/25mm, and the swelling rate is 11.9-13.4%.

Description

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Claims

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Application Information

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Owner JIANGSU TENPOWER LITHIUM
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