Preparation method of thick electrode with excellent electrochemical performance and lithium ion battery

An electrode and positive electrode technology, applied in the field of high energy density lithium-ion batteries, can solve the problems of uneven conductivity of electrode sheets, poor long-term cycle performance and rate performance of batteries, and poor electrolyte infiltration, etc., to reduce surface tension, improve Rate performance and long cycle performance, the effect of enhancing absorption and retention performance

Inactive Publication Date: 2017-08-25
上海汇平新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual manufacture and application of thick electrodes, there are also certain technical difficulties. As the thickness of the electrode sheet increases, it is easy to cause

Method used

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  • Preparation method of thick electrode with excellent electrochemical performance and lithium ion battery
  • Preparation method of thick electrode with excellent electrochemical performance and lithium ion battery
  • Preparation method of thick electrode with excellent electrochemical performance and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0025] Example 1:

[0026] Production of thick positive pole piece:

[0027] a. The positive active material LiNi 1 / 3 Mn 1 / 3 Co 1 / 3 O 2 , Porous carbon conductive agent (Heraeus Lion), the positive electrode binder PVDF according to the weight ratio of 93:4:3, mix and stir uniformly to obtain the positive electrode powder;

[0028] b. Add the fluorocarbon surfactant (Shanghai Huiping New Energy Co., Ltd. WA1600) to the N-methyl-2-pyrrolidone solution and mix evenly, where the fluorocarbon surfactant: N-methyl-2-pyrrolidone: positive electrode powder =0.2:85:100 (weight ratio), add the above-mentioned positive electrode powder and stir for 1 to 5 hours to obtain positive electrode slurry;

[0029] c. Coat the positive electrode slurry on the aluminum foil current collector, the coating thickness is 300μm, and dry to obtain the positive pole piece;

[0030] d. Roll the pole pieces and then slit them to obtain a thick positive pole piece with an overall thickness of about 300 μm.

[0031]...

Example Embodiment

[0039] Example 2:

[0040] Production of thick positive pole piece:

[0041] a. The positive active material NMC (111), porous carbon conductive agent (Heraeus Lion), the positive electrode binder PVDF according to the weight ratio of 92:5:3, mix and stir uniformly to obtain the positive electrode powder;

[0042] b. Add the fluorocarbon surfactant (Shanghai Huiping New Energy Co., Ltd. WA1600) to the N-methyl-2-pyrrolidone solution and mix evenly, where the fluorocarbon surfactant: N-methyl-2-pyrrolidone: positive electrode powder =0.5:85:100 (weight ratio), add the above-mentioned positive electrode powder and stir for 1 to 5 hours to obtain positive electrode slurry;

[0043] c. Coat the positive electrode slurry on the aluminum foil current collector, the coating thickness is 350μm, and dry to obtain the positive pole piece;

[0044] d. Roll the pole pieces and then slit them to obtain a thick positive pole piece with an overall thickness of about 350 μm.

[0045] Production of thi...

Example Embodiment

[0053] Example 3:

[0054] Production of thick positive pole piece:

[0055] a. The positive active material NMC (111), porous carbon conductive agent (Heraeus Lion), the positive electrode binder PVDF according to the weight ratio of 91.5:5.5:3, mix and stir uniformly to obtain the positive electrode powder;

[0056] b. Add the fluorocarbon surfactant (Shanghai Huiping New Energy Co., Ltd. WA1600) to the N-methyl-2-pyrrolidone solution and mix evenly, where the fluorocarbon surfactant: N-methyl-2-pyrrolidone: positive electrode powder =0.8:85:100 (weight ratio), add to the above-mentioned positive electrode powder and stir for 1 to 5 hours to obtain positive electrode slurry;

[0057] c. Coating the positive electrode slurry on the aluminum foil current collector with a coating thickness of 400 μm, and drying to obtain a positive electrode piece;

[0058] d. Roll the pole pieces and slit them to obtain a thick positive pole piece with an overall thickness of about 400 μm.

[0059] Pro...

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Abstract

The invention discloses a thick electrode with excellent electrochemical performance. An electrode thickness of the thick electrode is larger than 300mu m. The thick electrode comprises an anode thick electrode body and a cathode thick electrode body, wherein the anode thick electrode body comprises an anode current collector, an anode active material, an anode binder, a porous carbon conductive agent and a fluorocarbon surfactant; the cathode thick electrode body comprises a cathode current collector, a cathode active material, a cathode binder, a porous carbon conductive agent and a thickener; the porous carbon conductive agent has rich porous channels, can obviously absorb and keep electrolyte and solves the problems that thick electrode electrolyte has poor wettability, active material utilization is insufficient, and the like; the fluorocarbon surfactant can reduce surface tension of anode slurry, improve a coating effect of the slurry on the current collectors and meanwhile improve absorbing and keeping ability of an anode piece to the electrolyte. By means of the technical characteristics, the anode thick electrode body and the cathode thick electrode body with excellent conducting performance can be prepared out, so that a high energy density lithium ion battery with excellent electrochemical performance can be obtained.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a method for preparing a positive electrode thick electrode and a negative electrode thick electrode with excellent electrochemical properties, and a high energy density lithium ion battery assembled from the prepared thick electrodes. Background technique [0002] With the continuous development of science and technology, the application field of lithium-ion batteries has expanded from portable electronic products to electric vehicles, energy storage power supplies, aviation fields, etc. Especially for large electric equipment such as electric vehicles, under the premise of ensuring safety, they need to have a certain mileage and a cycle life matching that of electric vehicles. Therefore, higher requirements are put forward for the energy density, cycle life and rate performance of lithium-ion batteries. Require. There are many ways to increase the energy densit...

Claims

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Application Information

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IPC IPC(8): H01M4/04H01M4/62H01M10/0525
CPCH01M4/0404H01M4/62H01M4/625H01M10/0525Y02E60/10
Inventor 陈湘宁龚雪梅
Owner 上海汇平新能源有限公司
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