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Binder system of lithium ion battery cathode slurry

A positive electrode slurry and binder technology, which is applied in the field of the binder system of the positive electrode slurry of lithium batteries, can solve the problems of poor fluidity and material agglomeration, and achieve the effects of good fluidity, low operating temperature and high purity

Active Publication Date: 2019-06-25
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the water-based binder is prone to agglomeration of materials and has poor fluidity

Method used

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  • Binder system of lithium ion battery cathode slurry
  • Binder system of lithium ion battery cathode slurry

Examples

Experimental program
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Embodiment 1

[0023] A binder system for a positive electrode slurry of a lithium battery, the binder system comprising stearamide and modified PVDF with a mass ratio of 0.2:99.8.

[0024] The modified PVDF is PVDF modified by modified titanium dioxide, and its preparation method is: adding foamed titanium oxide to a water-ethanol solution of a silane coupling agent, and the mass ratio of the foamed titanium oxide to the silane coupling agent is 1:0.4 , the mass volume ratio of silane coupling agent and water-ethanol solution is 1g:65mL, stir at 40°C for 24h, filter, wash with absolute ethanol, and dry to obtain foamed titanium oxide modified by silane coupling agent; PVDF Add 3.5% PVDF mass of silane coupling agent-modified foamed titanium oxide, mix well, stir and react at 125°C for 1.5h to obtain modified PVDF.

[0025] The modified titanium dioxide is foamed titanium dioxide, and its preparation method is: making a water-based slurry with a solid content of 35% from metal titanium powde...

Embodiment 2

[0029] A binder system for a positive electrode slurry of a lithium battery, the binder system comprising stearic acid monoglyceride and modified PVDF with a mass ratio of 0.5:99.5.

[0030] The modified PVDF is PVDF modified by modified titanium dioxide, and its preparation method is: adding foamed titanium oxide to a water-ethanol solution of a silane coupling agent, and the mass ratio of the foamed titanium oxide to the silane coupling agent is 1:0.3 , the mass volume ratio of silane coupling agent and water-ethanol solution is 1g:50mL, stir at 30°C for 28h, filter, wash with absolute ethanol, and dry to obtain foam titanium oxide modified by silane coupling agent; PVDF Add 2% PVDF mass of silane coupling agent-modified foamed titanium oxide, mix evenly, and stir and react at 100°C for 2 hours to obtain modified PVDF.

[0031]The modified titanium dioxide is foamed titanium dioxide, and its preparation method is as follows: the metal titanium powder with a particle size of ...

Embodiment 3

[0035] The difference between Example 3 and Example 1 is that the binder system in Example 3 includes a dispersant and modified PVDF at a mass ratio of 0.7:99.3. Others are all the same as in Example 1.

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Abstract

The invention relates to the technical field of lithium ion batteries, and discloses a binder system of lithium ion battery cathode slurry in view of the problem that the existing ceramic diaphragm has large impedance and cannot block ion conduction and achieve a safety effect under the condition of overcharging. The binder system comprises a dispersant and modified PVDF with a mass ratio of (0.1-2): (98-99.9). The modified PVDF is PVDF modified by foamed titanium dioxide, and the fluidity of PVDF is improved. The dispersant and the highly-cohesive modified PVDF are composited into the bindersystem of cathode slurry. By adopting the binder system, the amount of binder used can be greatly reduced, the energy density of batteries can be increased, the stability of cathode slurry can be simultaneously improved, the occurrence of slurry coagulation can be inhibited, and good fluidity of slurry is achieved under the condition of high solid content.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a binder system for lithium battery cathode slurry. Background technique [0002] Binder, as an inactive component in lithium-ion battery electrode sheets, is one of the important materials that must be used in the preparation of lithium-ion battery electrode sheets. The main function of the binder is to connect the electrode active material, the conductive agent and the electrode collector, so that there is an overall connection between them, thereby reducing the impedance of the electrode and better stabilizing the structure of the electrode sheet. At present, the general positive electrode binder (PVDF) is added in a large amount, which affects the overall energy density of the battery. However, when some high-adhesion modified PVDF is used, the slurry is often unstable, resulting in agglomeration between materials. High viscosity, gel-like, poor fluidity. [0...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M10/052
CPCY02E60/10
Inventor 陆挺王涌吴晨琰
Owner WANXIANG 123 CO LTD
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