Waterborne environment-friendly conductive slurry and preparation method thereof

A conductive paste, environmentally friendly technology, applied in the direction of circuits, electrical components, battery electrodes, etc., can solve the problems of poor discharge performance, unstable paste, difficult dispersion of nano-materials, etc., to improve dispersibility and stability, improve Low-temperature discharge performance and the effect of improving electrical conductivity

Inactive Publication Date: 2018-09-07
四川西丹孚能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The carbon nanotube material has a large delocalized π bond, and the π-π conjugation is easily formed between the tubes and the tubes are agglomerated together, which leads to the problem that the nanomaterials are difficult to disperse
At present, it is reported that the oily system dispersion technology for carbon nanotubes is very mature, and has been industrialized for a long time, but there is no report on the technical bottleneck to solve the unstable slurry of carbon nanotubes in the water-based system. The water-based system of carbon nanotubes is unstable. will produce stratification
[0003] Carbon nanotubes are generally dispersed with NMP oily solvent, used in positive electrode slurry, and NMP is evaporated and recovered in the coating process. Now battery manufacturers spend a lot of money to purchase recovery equipment to recover NMP, but there are still many battery manufacturers NMP emissions do not meet environmental protection requirements
[0004] In addition, the discharge performance of lithium-ion batteries deteriorates sharply in low-temperature environments, which seriously affects the use of lithium-ion batteries in low-temperature environments. The "lithium dendrites" generated inside the batteries will cause safety problems

Method used

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  • Waterborne environment-friendly conductive slurry and preparation method thereof
  • Waterborne environment-friendly conductive slurry and preparation method thereof
  • Waterborne environment-friendly conductive slurry and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The invention provides a water-based environmentally friendly conductive paste, which comprises the following components:

[0036] In parts by mass, 5 parts of water-based binder, 0.1 part of carboxymethyl cellulose, 0.5 part of carbon nanotube, 0.1 part of dispersing aid, and 94.3 parts of solvent.

[0037] In this embodiment, the water-based binder is LA133.

[0038] In the present embodiment, described sodium carboxymethylcellulose is CMC2200.

[0039] In this embodiment, the carbon nanotubes are single-walled tubes.

[0040] In this embodiment, the dispersing aid is TNWDIS.

[0041] In this embodiment, the solvent is deionized water; the solid content of the water-based environmentally friendly conductive paste is 5.7%.

[0042] A preparation method of water-based environmentally friendly conductive paste, comprising the following steps,

[0043] S1. Weigh the water-based binder, carboxymethyl cellulose, carbon nanotubes, dispersing aid, and solvent according to...

Embodiment 2

[0053] The invention provides a water-based environmentally friendly conductive paste, which comprises the following components:

[0054] In parts by mass, 15 parts of water-based binder, 2 parts of carboxymethyl cellulose, 2 parts of carbon nanotubes, 1 part of dispersing aid, and 80 parts of solvent.

[0055] In this embodiment, the water-based binder is LA133N.

[0056] In the present embodiment, the sodium carboxymethylcellulose is CRT30000PA.

[0057] In this embodiment, the carbon nanotubes are multi-walled tubes, the diameter of the multi-walled tubes is 10 μm, and the tube length is 12 μm.

[0058] In this embodiment, the dispersing aid is an aromatic ring dispersing aid with a hydrophilic group.

[0059]本实施例中,所述的溶剂为双蒸水;水性环保导电浆料的固含量为20%。

[0060] 一种水性环保导电浆料的制备方法,包括以下步骤,

[0061] S1、按质量比称取所述的水性粘结剂、羧甲基纤维素、碳纳米管、分散助剂、溶剂;

[0062] S2、将称量好的物料按溶剂、分散助剂、碳纳米管的顺序添加到搅拌机内,预分散后形成固 / 液 / 气三相共存的混合物;

[0063] S3、将S2得到的混合物用隔膜泵转移到砂磨机中进行磨砂处理;

[0064] S4、将S3得到的混合物用隔膜泵过滤至搅拌机中,加入S1中准备好的羧...

Embodiment 3

[0071] 本发明提供一种水性环保导电浆料,包括以下组分:

[0072] 按质量份计,水性粘结剂7份、羧甲基纤维素1份、碳纳米管5份、分散助剂2份、溶剂85份。

[0073] 本实施例中,所述的水性粘结剂为LA133N和LA132。

[0074] 本实施例中,所述的羧甲基纤维素钠为CRT30000PA和CRT10000PA。

[0075] 本实施例中,所述的碳纳米管为多壁管,多壁管的管径为3μm,管长为8μm。

[0076] 本实施例中,所述的分散助剂为带亲水基团的芳香环类分散助剂。

[0077] 本实施例中,所述的溶剂为双蒸水;水性环保导电浆料的固含量为15%。

[0078] 一种水性环保导电浆料的制备方法,包括以下步骤,

[0079] S1、按质量比称取所述的水性粘结剂、羧甲基纤维素、碳纳米管、分散助剂、溶剂;

[0080] S2、将称量好的物料按溶剂、分散助剂、碳纳米管的顺序添加到搅拌机内,预分散后形成固 / 液 / 气三相共存的混合物;

[0081] S3、将S2得到的混合物用隔膜泵转移到砂磨机中进行磨砂处理;

[0082] S4、将S3得到的混合物用隔膜泵过滤至搅拌机中,加入S1中准备好的羧甲基纤维素,进行高速分散;过滤,过滤筛网采用250目的锲形筛网;

[0083] S5、加入S1中准备好的水性粘结剂,重复步骤S4,抽真空消泡,得到水性环保导电浆料。

[0084] 本实施例中,步骤S2中,搅拌机采用超声波分散搅拌机,将溶剂温度控制在35℃;搅拌机的公转速度为19RPM、自转线速度为9m / s,预分散时间为20min;

[0085] 步骤S3中,砂磨介质选用1.1mm的硅酸锆珠或氧化锆珠,磨砂处理时间为17min;

[0086] 步骤S4中,搅拌机采用双行星搅拌机;高速分散的时间为40min;

[0087] 步骤S3和步骤S4中,隔膜泵采用Husky3300隔膜泵。

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Abstract

The invention discloses a waterborne environment-friendly conductive slurry. The waterborne environment-friendly conductive slurry is prepared from the following components in parts by mass: 5 to 20 parts of waterborne adhesive, 0.1 to 3 parts of carboxymethyl cellulose, 0.5 to 10 parts of carbon nanotube, 0.1 to 3 parts of dispersing additive, and 70 to 95 parts of solvent. The preparation methodof the waterborne environment-friendly conductive slurry comprises the following steps of sequentially adding the solvent, the dispersing additive and the carbon nanotube into a stirrer for stirring;pumping into a sand mill for sand milling; filtering by a diaphragm pump into the stirrer, adding the carboxymethyl cellulose, and dispersing and filtering at high speed; adding a waterborne adhesiveprepared in step S1, dispersing and filtering again at high speed, vacuumizing and defoaming. The waterborne environment-friendly conductive slurry has the advantages that the excellent low-temperature discharge property is realized, and the difficult problem of instability in viscosity of the waterborne nanotube slurry is solved.

Description

technical field [0001] The invention belongs to the technical field of battery manufacturing, and in particular relates to a water-based environment-friendly conductive paste and a preparation method thereof. Background technique [0002] Carbon nanotubes are one-dimensional conductive materials. Carbon nanotubes have a network structure and are widely used as a new type of conductive agent for lithium-ion batteries because of their excellent electrical conductivity and rate capability. The carbon nanotube material has a large delocalized π bond, and the π-π conjugation is easily formed between the tubes and the tubes are agglomerated together, which leads to the problem that the nanomaterials are difficult to disperse. At present, it is reported that the oily system dispersion technology for carbon nanotubes is very mature, and has been industrialized for a long time, but there is no report on the technical bottleneck to solve the unstable slurry of carbon nanotubes in the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62
CPCH01M4/622H01M4/625Y02E60/10
Inventor 刘剑光
Owner 四川西丹孚能源科技有限公司
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