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Method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

A positive active material and secondary battery technology, applied in the direction of non-aqueous electrolyte batteries, active material electrodes, electrode manufacturing, etc., can solve the problems of unexplained manufacturing methods of positive active materials, achieve less surface damage, and suppress the increase of internal resistance , The effect of water resistance improvement

Active Publication Date: 2016-05-18
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] However, in Patent Document 2, although it is disclosed that the gelation resistance is improved by controlling the pH of the positive electrode active material, it does not describe the specific method for producing the positive electrode active material.

Method used

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  • Method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery
  • Method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery
  • Method for producing positive electrode active material for nonaqueous electrolyte secondary batteries, positive electrode active material for nonaqueous electrolyte secondary batteries, and nonaqueous electrolyte secondary battery

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preparation example Construction

[0055] The preparation method of the mixture in the mixing step is not particularly limited as long as it is a method capable of sufficiently mixing the materials, and known methods can be used, but among them, it is preferable to use a kneading mixer of a self-rotation and revolution system for mixing. The above-mentioned kneading mixer can apply moderate shear force to the mixture to achieve uniform mixing, and can mix in a short time. For example, if the processing capacity is 20-50g, the mixing time is preferably 1-5 minutes. According to the processing capacity Just make adjustments. The short-time mixing by the kneading and agitating machine of the self-rotating and revolving system can also suppress damage to the surface of the particles. On the other hand, if a device such as a bead mill, a ball mill, a rod mill, a homogenizer, etc. is used to directly apply a large force to the positive electrode active material particles, sometimes the positive electrode active mater...

Embodiment 1

[0136] (lithium-nickel composite compound LiNiCoAlO 2 )

[0137] A lithium-nickel composite oxide powder obtained by a known technique was used as the positive electrode active material. That is, by mixing and firing nickel oxide powder mainly composed of Ni and lithium hydroxide, Li 1.06 Ni 0.76 co 0.14 Al 0.10 o 2 Represented lithium-nickel composite oxide powder. The lithium-nickel composite oxide powder has an average particle size of 7.6 μm and a specific surface area of ​​0.82 m 2 / g.

[0138] (Preparation of positive electrode active material)

[0139] First, 10 parts by mass of carbon fine particles (manufactured by Denka, trade name "HS100") and 1 part by mass of a polycarboxylate polymer dispersant (manufactured by Kao, trade name "HOMOGENOLL18") were added in advance to 2-propanol. A carbon-containing composition (2) (hereinafter referred to as "dispersion liquid") was prepared.

[0140] Next, 20 g of the lithium-nickel composite oxide powder was taken out...

Embodiment 2

[0143] Add 0.2 parts by mass of polydimethylsiloxane containing hydroxyl groups, 0.1 parts by mass of propylene glycol, 0.2 parts by mass of carbon particles from the dispersion, 0.02 parts by mass of polycarboxylic acid polymer dispersant, and 4.9 parts by mass of 2-propanol to obtain Except for the mixture, a positive electrode active material was obtained in the same manner as in Example 1, and evaluation was performed at the same time. The viscosity of the mixture was 560 mPa·s.

[0144] The initial discharge capacity of the obtained positive electrode active material was 201 mAh / g, and the positive electrode resistance value was 1.2. Furthermore, the evaluation results of water resistance were pH=10.3, the electrical conductivity was 120 μS / cm, and the evaluation results of moisture resistance were a mass increase rate of 0.7%. According to the evaluation of gelation, the positive electrode composite material paste did not gel even after being left at room temperature fo...

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Abstract

To provide: a method for producing a positive electrode active material, which is capable of improving water resistance of the positive electrode active material and suppressing gelation of a positive electrode mixture paste without deteriorating the original battery performance of the positive electrode active material; and the like. A method for producing a positive electrode active material for nonaqueous electrolyte secondary batteries, which is provided with: a mixing step for preparing a mixture that contains fine carbon particles, an organic dispersant, a hydrophobic coating film-forming agent, an organic solvent and positive electrode active material particles; a drying step for drying the mixture so as to obtain a mixture in which the content of the organic solvent is reduced; and a heat treatment step for subjecting the mixture, in which the content of the organic solvent is reduced, to a heat treatment so as to obtain a coated positive electrode active material.

Description

technical field [0001] The present invention relates to a method for producing a positive electrode active material for a nonaqueous electrolyte secondary battery, a positive electrode active material for a nonaqueous electrolyte secondary battery, and a nonaqueous electrolyte secondary battery. Background technique [0002] Non-aqueous electrolyte secondary batteries are light in weight and can obtain high energy density. For example, as a power source mounted on a vehicle that uses electricity as a driving source, or as a power source used in personal computers, mobile terminals, and other electronic products, Its importance is growing. [0003] A typical non-aqueous electrolyte secondary battery includes a lithium ion secondary battery in which lithium ions are charged and discharged by passing lithium ions back and forth between a positive electrode and a negative electrode. The electrode of a lithium ion secondary battery with a typical structure has a structure in whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62
CPCC01G53/42C01P2006/12C01P2006/40H01M4/0471H01M4/131H01M4/1391H01M4/366H01M4/505H01M4/525H01M4/587H01M4/62H01M4/625H01M10/052Y02E60/10Y02P70/50H01M4/0402H01M10/0525H01M10/0585H01M2004/028
Inventor 高梨昌二小向哲史
Owner SUMITOMO METAL MINING CO LTD
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