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

AI Technical Summary

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-ba

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

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0058] Example 1:

[0059] At room temperature, mix the thickener CMC powder and ultra-pure deionized water at 2:98, and stir in a planetary mixer at 500r / min and 50r / min for 6h at room temperature to obtain a transparent viscous colloidal solution. Add the remaining components in the following proportions, and the mass ratio thickener CMC: active material micron silicon / silicon nitride / graphite (Si:Si 3 N 4 : C = 76.8%: 10.4%: 12.8%): micron silicon / silicon carbide / graphite (Si:SiC:C=70%: 21%: 9%): conductive agent KS-15: binder SBR: elimination Foaming agent EC=1%: 45%: 40%: 3%: 10%: 1%, add active material micron silicon / silicon nitride / graphite and micron silicon / silicon carbide / graphite mixture to rotate 500r / min , Revolve 50r / min and stir at room temperature for 1h. After adding conductive agent KS-15, it will rotate at 500r / min, revolve at 50r / min and stir at room temperature for 1h. After adding binder SBR, it will rotate at 200r / min and revolve at 20r / min for 0.25h at lo...

Example Embodiment

[0060] Example 2:

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

Example Embodiment

[0062] Example 3:

[0063] At room temperature, the thickener CMC powder and ultra-pure deionized water are mixed at 2:98, and stirred in a planetary mixer at a rotation of 300r / min and a revolution of 30r / min at 60°C for 3 hours to obtain a transparent viscous colloidal solution. Add the remaining components in the following proportions, and the mass ratio thickener CMC: active material micron silicon / silicon oxide / graphite (Si:SiO:C=75%: 16%: 9%): micron 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 active material of micron silicon / silicon oxide / graphite and micron silicon / silicon carbide / graphite mixture, rotate 350r / min, revolution 35r / min, stir at room temperature for 2.5h, add conductive agent VGCF After mixing with SPG-15, rotate 500r / min, revolution 50r / min and stir at room temperature for 1h, add binder LA133N, rotate 200r / min, revolution 20r / min, stir at low spe...

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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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