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Composite adhesive, preparation method thereof, lithium battery

A binder, lithium battery technology, used in battery electrodes, secondary batteries, circuits, etc., can solve the problems of cycle stability, rate performance capacity or unsatisfactory safety performance, and improve cycle stability performance, rate performance and safety performance. Excellent safety performance and easily controllable conditions

Active Publication Date: 2015-11-11
RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another object of the present invention is to overcome the above-mentioned deficiencies in the prior art, and provide a lithium battery to solve the technical problems of unsatisfactory cycle stability, rate performance, capacity or safety performance of existing lithium batteries, especially lithium-ion batteries

Method used

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  • Composite adhesive, preparation method thereof, lithium battery
  • Composite adhesive, preparation method thereof, lithium battery
  • Composite adhesive, preparation method thereof, lithium battery

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preparation example Construction

[0030] Correspondingly, the embodiment of the present invention also provides a preparation method of the above-mentioned composite binder. The process flow of the composite binder preparation method is as follows: figure 1 As shown, it includes the following steps:

[0031] Step S01: mixing the conductive polymer monomer, the water-based binder and the acidic medium in proportion to prepare a mixed reaction solution;

[0032] Step S02: adjust the temperature of the mixed reaction solution prepared in step S01 to 0-30° C., and then add an initiator to carry out in-situ composite reaction until the completion, to obtain the composite binder.

[0033] Specifically, the conductive polymer monomer, water-based binder and acidic medium in the above step S01 and the selected type of water-based binder in the step S02 are all the same as the conductive polymer monomer described above in the composite binder. , water-based binder and acidic medium, in order to save space, no more de...

Embodiment 1

[0047] A polyaniline / polyacrylic acid composite binder and a preparation method thereof. The preparation method of polyaniline / polyacrylic acid composite binder comprises the following specific steps:

[0048] S11: Add 2g of polyaniline monomer and 50ml of 1M HCl into a three-necked flask, sonicate for 10min, and mix well;

[0049] S12: Weigh 8g of 25wt% polyacrylic acid aqueous solution, add it into a three-necked flask, and stir at 300rpm;

[0050] S13: Place the three-necked flask in an ice-water bath, and keep the temperature inside the flask at about 5°C;

[0051] S14: Slowly add ammonium persulfate aqueous solution (6.25gAPS dissolved in 50mlH 2 0), the rate of drop is 1 drop / second;

[0052] S15: Continue stirring and reacting for 12 hours to prepare a polyaniline / polyacrylic acid composite binder.

[0053] The polyaniline / polyacrylic acid composite binder prepared in embodiment 1 is carried out scanning electron microscope (SEM) analysis, scanning electron microsco...

Embodiment 2

[0055] A composite binder and a preparation method thereof. Composite binder preparation method comprises following specific steps:

[0056] S21: Add 0.2g of polyaniline monomer and 0.5g of 50wt% phytic acid aqueous solution into the sample bottle, sonicate for 10min, and mix well;

[0057] S22: Weigh 0.8g of 25wt% polyacrylic acid aqueous solution, add it to the sample bottle, and stir at 300 rpm;

[0058] S23: Weigh 1.6g of nano-silicon, add it into the sample bottle, and adjust the solid content of the slurry to about 35%;

[0059] S24: Slowly add 0.09g initiator ammonium persulfate to the sample bottle;

[0060] S25: coating the adjusted slurry on the copper foil, and drying in vacuum at 60° C. to obtain a silicon-based negative electrode material electrode;

[0061] S26: The electrode prepared in S25 is used as the negative electrode, and the metal lithium sheet is used as the positive electrode, and assembled into a button battery, and the electrochemical performance ...

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Abstract

The invention discloses a composite adhesive, a preparation method thereof and a lithium battery. The composite adhesive is prepared by in-situ composite reaction of a conductive polymer monomer and an aqueous adhesive in an environment in which an acidic medium exists. The preparation method thereof comprises steps of preparing a mixed reaction solution and adding an initiator for in-situ composite reaction. The adhesive in an active material layer of a lithium battery electrode adopts the composite adhesive disclosed by the invention. The composite adhesive disclosed by the invention has high binding performance and conductivity, the structural firmness of the electrode during the discharging and charging process and the cyclic stability of the lithium battery can be effectively improved, and meanwhile, the rate capability and the capacity of the lithium battery can also be effectively improved. The preparation method has the advantages that the process is simple, a condition is easy to control, the composite adhesive obtained according to the preparation method is stable in performance, moreover, production efficiency is high, and production cost is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a composite binder, a preparation method thereof and a lithium battery. Background technique [0002] With the extensive development and rapid application of various portable electronic devices and electric vehicles, there is an increasingly urgent demand for high-performance lithium batteries, especially lithium-ion batteries, with high capacity, long life, high rate and safety. As one of the key materials of lithium batteries, anode materials play a vital role in improving the performance of lithium batteries. Among them, silicon-based anode materials have attracted the attention of more and more researchers due to their outstanding advantages and potential. [0003] However, in the actual research and application process, it is found that during the charging and discharging process of the silicon-based negative electrode material, the volume of the silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/134H01M10/0525
CPCH01M4/134H01M4/621H01M4/622H01M10/0525Y02E60/10
Inventor 叶利强符冬菊陈建军马清张维丽王晓伟袁凯杰
Owner RESEARCH INSTITUTE OF TSINGHUA UNIVERSITY IN SHENZHEN
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