Lithium battery electrode and dry preparation method and application thereof

A lithium battery, dry process technology, applied in the field of materials, can solve problems such as poor applicability, high requirements for hot pressing process, and it is difficult for ordinary equipment to meet the requirements of process pressure, so as to achieve unaffected conductivity and good cycle stability. The effect of stability and low internal resistance

Inactive Publication Date: 2021-04-09
TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current commonly used dry electrode preparation has high requirements for the hot pressing process, and it is difficult for ordinary equipment to meet the pressure requirements of the process, so the applicability is not good

Method used

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  • Lithium battery electrode and dry preparation method and application thereof
  • Lithium battery electrode and dry preparation method and application thereof
  • Lithium battery electrode and dry preparation method and application thereof

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preparation example Construction

[0039] The embodiment of the present invention provides a dry method for preparing lithium battery electrodes, the main method steps are as follows: figure 1 shown, including:

[0040] Step 110, mixing the first conductive agent and the first binder according to the required ratio, and coating on the foil to form a first coating layer;

[0041] Wherein, the electrode material includes any one of positive electrode material or negative electrode material;

[0042] The positive electrode material includes one or a combination of lithium nickel cobalt manganese oxide, lithium iron phosphate, lithium cobalt oxide, lithium manganese oxide, and lithium nickel oxide;

[0043] Negative electrode materials include one or a combination of nano-silicon, silicon-oxygen, silicon-carbon, graphite, soft carbon, and hard carbon;

[0044] The foil material can be selected from conventionally used aluminum foil, copper foil, and the like.

[0045] The first conductive agent includes one or a...

Embodiment 1

[0067] This embodiment provides a dry electrode preparation method for a lithium battery electrode, comprising the following steps:

[0068] Dispersing carbon nanotubes (CNTs) in a polyvinylidene fluoride (PVDF) solution, wherein CNTs accounts for 5wt% of the dispersion, and coating the dispersion on the surface of the copper foil;

[0069] According to the mass ratio of 90:5:2.5:2.5, graphite negative electrode material, conductive agent conductive carbon black (SP), binder styrene-butadiene rubber and sodium carboxymethyl cellulose (CMC) were placed in a closed mixer for dry process Mixing, the stirring rate is 2000rpm, and the stirring state is kept for 1 hour. After the completion, the mixed slurry is coated on the copper foil coated with the dispersion liquid, and hot-pressed. The hot-pressing temperature is 150°C and the hot-pressing pressure is 1MPa. Negative pole piece. The mass ratio of the first coating layer composed of the dispersion liquid applied in the first la...

Embodiment 2

[0081] This embodiment provides a dry method for preparing lithium battery electrodes, comprising the following steps:

[0082] Dispersing carbon nanotubes (CNTs) in a polyvinylidene fluoride (PVDF) solution, wherein CNTs accounts for 25wt% of the dispersion, and coating the dispersion on the surface of the copper foil;

[0083] According to the mass ratio of 88:6:3:3, the silica negative electrode material, the conductive agent conductive carbon black (SP), the binder styrene-butadiene rubber and sodium carboxymethyl cellulose (CMC) were placed in a closed mixer for drying. Method mixing, the stirring rate is 1600rpm, and the stirring state is kept for 1 hour. After the completion, the mixed slurry is coated on the copper foil coated with the dispersion liquid, and hot-pressed. The hot-pressing temperature is 120°C, and the hot-pressing pressure is 3MPa. Obtain the negative pole piece. The mass ratio of the first coating layer composed of the dispersion liquid applied in the...

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Abstract

The invention relates to a lithium battery electrode and a dry preparation method and application thereof. The dry preparation method comprises the following steps of: mixing a first conductive agent with a first binder according to a required ratio, and coating a foil with the mixture to form a first coating layer; putting the electrode material, a second conductive agent and a second adhesive into a closed stirrer according to a required ratio, and performing dry mixing to obtain electrode slurry; coating the first coating layer with the electrode slurry to form a second coating layer; and carrying out hot pressing on the foil loaded with the first coating layer and the second coating layer at a set temperature and a set pressure to obtain the lithium battery electrode.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a lithium battery electrode and its dry preparation method and application. Background technique [0002] With the rapid development of modern social economy and technology, the performance of traditional lithium-ion batteries can no longer meet the current energy demand. The rapid development of electric vehicles, intelligent consumer electronics and other fields are in urgent need of lithium-ion batteries with higher energy density, long cycle life, low cost, and high safety. [0003] At present, in terms of positive and negative electrodes, while the requirements for material capacity are getting higher and higher, higher requirements are also put forward for the stability and consistency of the positive and negative electrodes. At present, the R&D focus of domestic enterprises and research institutes is mainly on the development of NCM811 / NCA / LiCoO 2 / LRM is the positive ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/13H01M4/139H01M10/052H01M10/0525H01M4/62
CPCH01M4/0404H01M4/0435H01M4/0471H01M4/139H01M4/13H01M10/052H01M10/0525H01M4/623Y02E60/10
Inventor 毛泽民桂鲁哲桂客李立飞
Owner TIANMU LAKE INST OF ADVANCED ENERGY STORAGE TECH CO LTD
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