Sulfonated polymer applied to lithium battery electrode as binder

A technology for sulfonated polymers and lithium batteries, applied in battery electrodes, non-aqueous electrolyte battery electrodes, secondary batteries, etc., can solve problems such as hindering electrode active materials, conductive media, and weak conductivity, so as to improve cycle performance, The effect of improving the magnification characteristic

Active Publication Date: 2015-03-25
BEIJING NATURE STONE SCI TECH DEVP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its resistivity to electrons and lithium ions, PVDF, on the one hand, binds the electrode active materials to make the conduction network complete; but on the other hand, its weak conductivity hinders the electrode active materials and conduction The conductance between the medium and the current collector, because a uniformly dispersed binder will exist between the electrode active material and the conductive medium, on the current collector, and coated on their surface

Method used

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  • Sulfonated polymer applied to lithium battery electrode as binder
  • Sulfonated polymer applied to lithium battery electrode as binder
  • Sulfonated polymer applied to lithium battery electrode as binder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1: Preparation of Sulfonated PEEK

[0029] Dissolve 2g of polyetheretherketone in 60mL of sulfuric acid (mass concentration: 95% to 98%), heat in a water bath at 40°C, stir vigorously for 20 hours, then pour the solution into water, filter it with suction, wash with water until neutral; heat in an oven After drying, a solid product was obtained, which was sulfonated polyether ether ketone with a sulfonation degree of 75%. See figure 1 Sulfonated polyether ether ketone with a sulfonation degree of 75% 1 H-NMR spectrum. Based on the spectrum and the number of hydrogen atoms in different chemical environments in the sulfonated polyether ether ketone molecule, it can be calculated that the degree of sulfonation is 75%, that is, sulfonic acid groups are attached to 75% of the repeating units.

[0030] Synthetic Reaction Equation for Preparation of Sulfonated Polyetheretherketone

[0031]

[0032] Step 2: Preparation of lithium battery electrodes

[0033] 2-1. Pr...

Embodiment 2

[0038] Step 1: Preparation of Sulfonated PEEK

[0039]Dissolve 2g of polyetheretherketone in 60mL of sulfuric acid (mass concentration: 95% to 98%), heat in a water bath at 40°C, stir vigorously for 5 hours, then pour the solution into water, filter it with suction, wash with water until neutral; heat in an oven After drying, a solid product was obtained, which was sulfonated polyether ether ketone with a sulfonation degree of 56%.

[0040] Step 2: Preparation of lithium battery electrodes

[0041] Same as step 2 in Example 1.

[0042] Step 3: Battery Performance Test Comparison

[0043] The sulfonated polyether ether ketone obtained in step 2-1 is used as a binder in the electrode slurry to use the obtained sulfur positive electrode for assembling a lithium battery, compared to using PVDF as a binder in the electrode slurry to use the obtained The sulfur cathode is used to assemble lithium batteries, and its battery cycle performance and rate performance are greatly improv...

Embodiment 3

[0045] Step 1: Preparation of Sulfonated PEEK

[0046] Same as step 1 in Example 1.

[0047] Step 2: Preparation of lithium battery electrodes

[0048] 2-1. Preparation of lithium battery electrodes containing sulfonates: mix sulfur and mesoporous carbon at a mass ratio of 3:1, heat in a closed container at 155°C for 24 hours to obtain active materials, and use conductive graphite as the conductive medium. 1 The obtained sulfonated polymer sulfonated polyetheretherketone is used as a binding agent, according to the mass ratio of active material: conductive graphite: sulfonated polyether ether ketone is 90:5:5 and then dispersed in N-formaldehyde The electrode slurry was obtained in a base pyrrolidone solvent, the electrode slurry was coated on an aluminum foil, and dried in vacuum at 70° C. for 24 hours to obtain a sulfur positive electrode used as a positive electrode of a lithium battery.

[0049] 2-2. Prepare a lithium battery electrode containing a traditional binder: as...

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Abstract

The invention relates to a sulfonated polymer applied to a lithium battery electrode as a binder as well as a method for preparing the lithium battery electrode. The sulfonated polymer is used as the binder in electrode slurry of the lithium battery electrode, the obtained lithium battery electrode is used for assembling a lithium battery, and the lithium battery is relatively long in charging-discharge cycle life and stable in work under a relatively high current density. The sulfonated polymer with a sulfonic acid group has excellent capacity of transferring lithium ions, so that the lithium ions can be rapidly transmitted back and forth between an electrode active material and an electrolyte, and the lithium battery which is stable to run under the rapid charging-discharging condition can be obtained. The sulfonated polymer which is used as the binder is sufficient in cohesion force and binding strength, and the electrode active material and a conductive medium are stuck onto a current collector by the sulfonated polymer and are unlikely to fracture and dust, so that the lithium battery has sufficient capacity and cycle performance as well as excellent rate capacity.

Description

technical field [0001] The invention relates to a lithium battery electrode slurry, in particular to the application of a sulfonated polymer as a binder in the preparation process of the electrode slurry of a lithium battery electrode, and a lithium battery electrode using the sulfonated polymer binder. Background technique [0002] With the gradual consumption of fossil energy, the development and effective utilization of new renewable energy has become an important issue for human beings. In recent years, the popularization and promotion of facilities such as smart grids, pure electric vehicles and hybrid vehicles has been increasing, making the research and development of corresponding energy storage devices that can match them become one of the technical problems that need to be overcome urgently. . Lithium battery has the advantages of high energy density, good cycle performance, and high voltage, and has become the best energy storage solution at present. At present,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/139H01M4/62H01M4/13
CPCH01M4/133H01M4/1393H01M4/621H01M10/0525H01M4/13H01M4/139H01M4/62Y02E60/10
Inventor 潘跃德周亚红赵庆陈军江雷窦士学
Owner BEIJING NATURE STONE SCI TECH DEVP
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