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Lithium iron phosphate cathode slurry of lithium ion battery, preparation method of lithium iron phosphate cathode slurry and cathode pole piece

A lithium-ion battery and lithium iron phosphate technology, which is applied in electrode manufacturing, battery electrodes, secondary batteries, etc., can solve the problems that lithium iron phosphate active materials are not easy to disperse, and achieve easy dispersion processing, low viscosity, and good dispersibility Effect

Pending Publication Date: 2020-09-22
蜂巢能源科技(马鞍山)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the problem that the lithium iron phosphate active material in the existing lithium iron phosphate positive electrode slurry is not easy to disperse, the present invention provides a lithium iron phosphate positive electrode slurry. By optimizing the positive electrode slurry formula, the components in the positive electrode slurry are uniformly dispersed, And there will be no sedimentation, ensuring that the performance of the slurry meets the use standards of lithium-ion battery cathode slurry

Method used

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  • Lithium iron phosphate cathode slurry of lithium ion battery, preparation method of lithium iron phosphate cathode slurry and cathode pole piece
  • Lithium iron phosphate cathode slurry of lithium ion battery, preparation method of lithium iron phosphate cathode slurry and cathode pole piece
  • Lithium iron phosphate cathode slurry of lithium ion battery, preparation method of lithium iron phosphate cathode slurry and cathode pole piece

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Embodiment 1

[0053] A lithium iron phosphate positive electrode slurry for a lithium ion battery of the present embodiment has the following formula (each component is in parts by mass):

[0054] Lithium iron phosphate (specific surface area is 8.68m 2 / g) 93 parts;

[0055] 2 parts of 15% acrylate multipolymer solution (substitution degree 1.73);

[0056] 3 parts of polyacrylic resin emulsion;

[0057] 2 parts of SP-Li;

[0058] Among them, the tap density of lithium iron phosphate is 0.92g / cm 3 ; The pH value of the 15% acrylate multi-polymer solution is 6.86, and the viscosity is 2340mPa·S; the specific surface area of ​​SP-Li is 58m 2 / g; During use, 2 parts of 15% acrylate multipolymer solution and 3 parts of polyacrylic resin emulsion are mixed into binder.

[0059] According to the above formula, the preparation method of a lithium iron phosphate positive electrode slurry for a lithium ion battery in this embodiment comprises the following steps:

[0060] (1) Preparation of co...

Embodiment 2

[0065] A lithium iron phosphate positive electrode slurry for a lithium ion battery of the present embodiment has the following formula (each component is in parts by mass):

[0066] Lithium iron phosphate (specific surface area is 8.52m 2 / g) 95 parts;

[0067] 1 part of 15% acrylate multi-polymer copolymer solution (substitution degree 1.73);

[0068] 3 parts of polyacrylic resin emulsion;

[0069] 1 part of SP-Li;

[0070] Among them, the tap density of lithium iron phosphate is 0.93g / cm 3 ; The pH value of the 15% acrylate multi-polymer solution is 6.86, and the viscosity is 2340mPa·S; the specific surface area of ​​SP-Li is 58m 2 / g. When using, mix 1 part of 15% acrylate multi-polymer copolymer solution and 3 parts of polyacrylic resin emulsion into adhesive.

[0071] The preparation method of a lithium iron phosphate positive electrode slurry for a lithium ion battery in this embodiment comprises the following steps:

[0072] (1) Preparation of conductive glue: T...

Embodiment 3

[0077] A lithium iron phosphate positive electrode slurry for a lithium ion battery of the present embodiment has the following formula (each component is in parts by mass):

[0078] Lithium iron phosphate (specific surface area is 9.03m 2 / g) 97 parts;

[0079] 1 part of 15% acrylate multi-polymer copolymer solution (substitution degree 1.73);

[0080] 1 part of polyacrylic resin emulsion;

[0081] 1 part of SP-Li;

[0082] Among them, the tap density of lithium iron phosphate is 0.92g / cm 3 ; The pH value of the 15% acrylate multi-polymer solution is 6.86, and the viscosity is 2340mPa·S; the specific surface area of ​​SP-Li is 58m 2 / g, pH 9.03. When using, mix 1 part of 15% acrylate multipolymer solution and 1 part of polyacrylic resin emulsion to form a binder.

[0083] The preparation method of a lithium iron phosphate positive electrode slurry for a lithium ion battery in this embodiment comprises the following steps:

[0084] (1) Preparation of conductive glue: Ta...

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Abstract

The invention discloses lithium iron phosphate cathode slurry of a lithium ion battery, a preparation method of the lithium iron phosphate cathode slurry and a cathode pole piece, and belongs to the field of lithium ion batteries. The positive electrode slurry comprises 93-97 parts of a lithium iron phosphate positive electrode active substance, 2-5 parts of a binder and 1-3 parts of a conductiveagent, wherein the specific surface area of the lithium iron phosphate positive electrode active substance is 6-12 m<2> / g, and the binder contains an acrylate multipolymer with a substitution degree of 0.73-3.0. The preparation method comprises the following steps: fully mixing a conductive agent and a binder with the same mass to form a conductive glue solution with the pH value of 8-11, then adding the lithium iron phosphate positive electrode active substance and the binder, performing full stirring and dispersing in the conductive glue solution, and finally defoaming and adjusting the viscosity to obtain the lithium iron phosphate positive electrode slurry of the lithium ion battery. Components in the positive electrode slurry are uniformly dispersed, sedimentation is avoided, and theuse standard of an electrode is met.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and more specifically relates to a lithium iron phosphate positive electrode slurry for a lithium ion battery, a preparation method thereof, and a positive electrode sheet. Background technique [0002] The positive electrode slurry is one of the main parts of the lithium-ion battery structure, and the quality of the battery test results depends on the characteristics of the positive electrode material itself. The determination of the positive electrode slurry also has a high standard for the raw material itself, and its conditions are as follows: (1) The movement of lithium ions back and forth during the charging and discharging process will have a certain impact on the volume, so it should have a layered or tunnel structure, there is no big change in the volume of lithium ions when intercalating and extracting; (2) redox reactions occur during the back and forth intercalation and deintercal...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62H01M4/04H01M4/136H01M10/0525
CPCH01M4/5825H01M4/622H01M4/04H01M4/136H01M10/0525Y02E60/10
Inventor 胡治怿李航周浩周仁全冯莉
Owner 蜂巢能源科技(马鞍山)有限公司
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