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Lithium ion battery, negative electrode, negative electrode conductive paste and preparation method of negative electrode conductive paste

A lithium-ion battery and conductive paste technology, applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of electrode sheet quality degradation, difficult to remove air bubbles, etc., and fully guarantee the quality of electrode sheets and load uniformity , improve energy density, good effect of component dispersion

Inactive Publication Date: 2018-09-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The embodiment of the present invention provides a lithium-ion battery, negative electrode, negative electrode conductive paste and preparation method, to solve the problem existing in the preparation of the existing paste when the water-based adhesive system is added and the viscous paste is stirred at high speed to generate a large number of air bubbles. Eliminate the problems that lead to the deterioration of the electrode sheet quality and affect the electrochemical performance

Method used

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  • Lithium ion battery, negative electrode, negative electrode conductive paste and preparation method of negative electrode conductive paste
  • Lithium ion battery, negative electrode, negative electrode conductive paste and preparation method of negative electrode conductive paste
  • Lithium ion battery, negative electrode, negative electrode conductive paste and preparation method of negative electrode conductive paste

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Embodiment 1

[0059] At room temperature, mix thickener CMC powder and ultrapure deionized water at a ratio of 2:98, and stir in a planetary mixer at 500r / min rotation and 50r / min revolution for 6 hours at room temperature to obtain a transparent viscous colloidal solution. Add the remaining components sequentially in the following proportions, mass ratio thickener CMC: active material micron silicon / silicon nitride / graphite (Si:Si 3 N 4 : C=76.8%: 10.4%: 12.8%): Micron-sized silicon / silicon carbide / graphite (Si:SiC:C=70%: 21%: 9%): Conductive agent KS-15: Binder SBR: Disinfectant Foaming agent EC=1%: 45%: 40%: 3%: 10%: 1%, after adding the active material micron silicon / silicon nitride / graphite and micron silicon / silicon carbide / graphite mixture, the rotation speed is 500r / min , revolution 50r / min and stir at room temperature for 1h, add conductive agent KS-15, rotate at 500r / min, revolution at 50r / min, stir at room temperature for 1h, add binder SBR, rotate at 200r / min, revolution at 20r...

Embodiment 2

[0061]At room temperature, mix the thickener CMC powder and ultrapure deionized water at a ratio of 2:98, and stir in a planetary mixer at 500r / min and 50r / min for 2h at 50°C to obtain a transparent viscous colloidal solution. The remaining components are added in sequence in the following proportions, mass ratio thickener CMC: active material micron-sized silicon / silicon carbide / graphite (Si:SiC:C=70%:21%:9%): conductive agent SPG-6: sticky Binder LA132: defoamer PC=0.5%: 52%: 40%: 3.5%: 3.5%: 0.5%, after adding active material micron-sized silicon / silicon carbide / graphite, the rotation is 400r / min, and the revolution is 40r / min at room temperature Stir for 3 hours, add conductive agent SPG-6, stir at 400r / min and 40r / min at room temperature for 0.5h, add binder LA132, stir at low speed at 150r / min and 15r / min for 0.5h, add defoamer After PC, rotate at 150r / min, rotate at 15r / min and stir at low speed for 0.2h, make up the required amount of solvent ultra-pure deionized water...

Embodiment 3

[0063] At room temperature, mix the thickener CMC powder and ultrapure deionized water at a ratio of 2:98, and stir in a planetary mixer at 300r / min and 30r / min at 60°C for 3h to obtain a transparent viscous colloidal solution. Add the remaining components sequentially in the following proportions, mass ratio thickener CMC: active material micron-sized silicon / silicon oxide / graphite (Si:SiO:C=75%:16%:9%):micron-sized silicon / silicon carbide / Graphite (Si:SiC:C=70%: 21%: 9%): conductive agent VGCF: SPG-15: binder LA133N: defoamer EC=0.5%: 47%: 47%: 0.5%: 1 %: 3%: 1%, add the active material micron-sized silicon / silicon oxide / graphite and micron-sized silicon / silicon carbide / graphite mixture, then rotate at 350r / min, revolution at 35r / min and stir at room temperature for 2.5h, then add conductive agent VGCF After adding the SPG-15 mixture, stir at 500r / min and 50r / min at room temperature for 1h, add binder LA133N, stir at 200r / min and 20r / min at low speed for 0.2h, add defoamer ...

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Abstract

The invention discloses lithium ion battery negative electrode conductive paste, and belongs to the field of lithium ion battery material manufacturing. The conductive paste comprises a thickening agent, a binding agent, a conductive agent, a defoaming agent, an active substance and a solvent, on the basis of 100% by mass of the conductive paste, the solid content accounts for 5-30%, and the massratio of the thickening agent, the binding agent, the defoaming agent and the active substance is (0.1-2.0):(0.5-15):(0.5-15):(0.1-5):(70-97.5). The conductive paste is an aqueous binding agent system, carboxymethyl cellulose is used as the thickening agent, and a silicon / silicon carbide / carbon compound is used as the active substance. Moreover, the invention also provides a preparation method ofthe conductive paste, a lithium ion battery negative electrode prepared by employing the conductive paste and a lithium ion battery. The half cell of the lithium ion battery, assembled by employing the negative electrode paste preparation method provided by the invention, has excellent cycle stability and initial coulombic efficiency.

Description

technical field [0001] The invention relates to the technical field of lithium ion battery material manufacturing, in particular to a lithium ion battery, a negative electrode, a negative electrode conductive paste and a preparation method. Background technique [0002] Lithium-ion batteries have experienced vigorous development in recent years due to their high energy density, high working voltage, stable cycle performance, good load characteristics, fast charge and discharge rate, safety and non-pollution, and are widely used in pure Various fields such as electric vehicles and portable electronic devices. [0003] Lithium-ion batteries mainly include the following components: positive electrode, negative electrode, separator, electrolyte, current collector, and packaging shell, among which the capacity characteristics of the electrode material mainly determine the upper limit of the energy density of the battery. In addition, processes such as slurry preparation, coating...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/38H01M4/58H01M4/587H01M4/62H01M4/04H01M4/1395H01M4/134H01M10/0525
CPCH01M4/04H01M4/134H01M4/1395H01M4/366H01M4/386H01M4/58H01M4/587H01M4/62H01M4/622H01M4/623H01M4/625H01M4/628H01M10/0525Y02E60/10
Inventor 肖哲熙魏飞
Owner TSINGHUA UNIV
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