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Electrode slurry precursor, electrode slurry and preparation method of electrode slurry, electrode and lithium ion battery

A technology of electrode slurry and precursor, applied in the direction of electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems of long mixing time, high error rate, increased cost, etc., and achieve high uniformity and mechanical adhesion Good results

Active Publication Date: 2016-11-23
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The current feeding method has the following major disadvantages: ①Scheme A): The viscosity of the slurry mainly depends on the binder. The viscosity level of the slurry prepared by this solution is relatively high overall, relying on the slurry defoaming device, and the mixing time is relatively long; ②Scheme B): The dust pollution in the mixing workshop is serious, which is not conducive to the health of front-line personnel, the mixing equipment is easy to wear out, and the energy consumption is high; Introduce moisture and impurities; ④ Two options, for the gel component, only manual feeding is not conducive to rapid production; ⑤ Two options, recycling and processing various materials packaging will easily cause secondary pollution and increase costs

Method used

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Examples

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Effect test

preparation example Construction

[0032] The present invention provides a kind of preparation method of electrode slurry, and this method comprises:

[0033] (1) dissolving the polymer material containing polyvinylidene fluoride in an organic solvent to obtain a solution, and forming a film of the solution to obtain a packaging bag film;

[0034] (2) sealing the electrode material with the packaging bag film to obtain an electrode slurry precursor;

[0035] (3) adding the electrode slurry precursor into an organic solvent to dissolve to obtain an electrode slurry.

[0036] According to the present invention, the same technical terms are not repeatedly described, and the foregoing texts can be cited.

[0037] According to the electrode slurry of the present invention, preferably, the dissolving in the step (3) is carried out in the presence of the conductive agent slurry.

[0038] According to the electrode slurry of the present invention, the electrode slurry is prepared by dissolving the electrode slurry pr...

Embodiment 1

[0062] Packaging bag film preparation process: take a 300mL beaker, add 190gNMP and 10gHSV900 at 25°C, stir at 1000rpm for 60min, and obtain a PVDF solution with a concentration of 5% by weight; scrape the glass rod onto the flat glass plate surface; at -20°C, use dry air Dry the solvent to obtain an areal density of about 0.015g / cm 2 Thin film material (thickness 0.1mm);

[0063] Electrode slurry precursor preparation process: After simple mixing of various electrode powder materials (see Table 1 for the ratio), add them to the film and seal with double-sided tape.

[0064] Table 1

[0065] Lithium iron phosphate

Super_P

HSV900

Packaging bag film PVDF

100g

5g

3g

1g

[0066] The electrode slurry preparation process is as follows: ① put 135g NMP into a 400mL beaker; ② put the electrode slurry precursor into the beaker, stir at 500rpm for 30min; slurry. Wherein, the total mixing time is 150min.

[0067] Coating process: ① Take the ...

Embodiment 2

[0075] The composition of the electrode slurry precursor is shown in Table 3:

[0076] table 3

[0077] lithium nickel manganese cobalt oxide

CNT slurry

HSV900

Packaging bag film PVDF

100g

20g

0

1g

[0078] In the CNT slurry, the mass fraction of CNT is 5%.

[0079] The electrode slurry preparation process is as follows: ① put 41gNMP into a 400mL beaker; ②put the electrode slurry precursor into the beaker, stir at 500rpm for 30min; ③stir at 1500rpm for 30min, stop scraping; ④stir at 1500rpm for 90min, pass through a 200-mesh sieve to get the finished electrode slurry. (Total mixing time is 150min).

[0080] According to the method of Example 1, the sheet was coated and the battery was prepared.

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PUM

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Abstract

The invention relates to the battery filed and particularly provides an electrode slurry precursor which comprises a packaging film bag and an electrode material, and the electrode material is sealed in the packaging film bag which can be dissolved in an organic solvent. The invention provides an electrode slurry and a preparation method of the electrode slurry, the method comprises the steps that (1) polymer materials containing polyvinylidene fluoride are dissolved with an organic solvent to obtain a solution, and the solution is subjected to film forming to obtain the packaging film bag; (2) the electrode material is sealed with the packaging film bag, and the electrode slurry precursor is obtained; (3) the electrode slurry precursor is added to the organic solvent for dissolution to obtain the electrode slurry. The invention provides an electrode and a lithium ion battery. The electrode slurry is high in uniformity and good in mechanical adhesion force.

Description

technical field [0001] The invention relates to an electrode slurry precursor, an electrode slurry and a preparation method thereof, an electrode and a lithium ion battery. Background technique [0002] Electrode slurry with uniform component distribution directly affects the comprehensive performance of lithium-ion batteries. The current feeding methods are mainly the following two: A) prepare binder solution, add conductive agent to mix, add positive active material to mix to form a slurry; B) mix binder with conductive agent and positive active material, and mechanically stir for premixing , add solvent and mix to form a slurry. [0003] The current feeding method has the following major disadvantages: ①Scheme A): The viscosity of the slurry mainly depends on the binder. The viscosity level of the slurry prepared by this solution is relatively high, it depends on the slurry defoaming device, and the mixing time is relatively long; ②Scheme B): The dust pollution in the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/04H01M10/0525
CPCH01M4/0478H01M4/048H01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 张磊江文锋
Owner BYD CO LTD
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