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Method for producing positive electrode active material for lithium ion secondary batteries

A positive electrode active material and secondary battery technology, applied in the direction of electrode manufacturing, active material electrodes, battery electrodes, etc., can solve the problem of not improving output characteristics

Active Publication Date: 2021-09-28
SUMITOMO METAL MINING CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no improvement in output characteristics

Method used

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  • Method for producing positive electrode active material for lithium ion secondary batteries
  • Method for producing positive electrode active material for lithium ion secondary batteries
  • Method for producing positive electrode active material for lithium ion secondary batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0214] A positive electrode active material and a lithium ion secondary battery were fabricated and evaluated in the following procedures.

[0215] (washing process)

[0216] Using oxides and lithium hydroxide mainly composed of Ni and adopting known techniques, obtained is expressed as Li 1.025 Ni 0.91 co 0.06 al 0.03 o 2 The powder of the lithium-nickel composite oxide particle which is a layered compound is used as a base material. In addition, in the following other examples and comparative examples, lithium-nickel composite oxide as a layered compound was also used as a base material.

[0217] Then, 6000 mL of pure water at 25° C. was added to 6000 g of the base material to form a slurry, and the slurry was stirred for 15 minutes to perform water washing. After washing with water, filter using a filter press to separate solids and liquids. As a result of measuring the electrical conductivity of the filtrate obtained after filtration using SC measuring instrument SC...

Embodiment 2

[0228] In the mixing process, WO is added to the washing cake so that the amount of tungsten becomes 0.05 atomic % 3 , In addition, in the same manner as in Example 1, a positive electrode active material and a secondary battery were fabricated and evaluated.

[0229] The test conditions and evaluation results are shown in Table 1.

Embodiment 3

[0231] In the mixing process, WO is added to the washing cake so that the amount of tungsten becomes 0.30 atomic % 3 , In addition, in the same manner as in Example 1, a positive electrode active material and a secondary battery were fabricated and evaluated.

[0232] The test conditions and evaluation results are shown in Table 1.

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Abstract

A method for producing a positive electrode active material for lithium ion secondary batteries, which comprises: a water washing step wherein a lithium nickel composite oxide containing Li, Ni and an element M is cleaned with water and filtered, thereby obtaining a cleaned cake; a mixing step wherein the cleaned cake and a tungsten compound that does not contain lithium are mixed with each other, while being heated, thereby obtaining a tungsten mixture; and a heat treatment step wherein the tungsten mixture is subjected to a heat treatment. The moisture percentage of the cleaned cake is from 3.0% by mass to 10.0% by mass (inclusive); the ratio of the number of tungsten atoms contained in the tungsten mixture to the total number of Ni atoms and the element M atoms contained in the lithium nickel composite oxide is from 0.05% by atom to 3.00% by atom (inclusive); and the temperature of the mixing step is from 30 DEG C to 70 DEG C (inclusive).

Description

technical field [0001] The invention relates to a method for producing a positive electrode active material for a lithium ion secondary battery. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and laptop computers, there is an increasing demand for the development of small and lightweight secondary batteries with high energy density. In addition, there is an increasing demand for the development of high-output secondary batteries as batteries for electric vehicles including hybrid vehicles. [0003] As a secondary battery that can meet such demands, there is a lithium ion secondary battery. The lithium ion secondary battery is composed of a negative electrode, a positive electrode, an electrolyte, and the like, and the active materials of the negative electrode and the positive electrode are materials that can detach and insert lithium. [0004] Research and development of such lithium-ion secondar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G41/00C01G53/00H01M4/36H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10H01M4/1391H01M4/0471H01M4/366Y02E60/50C01G41/00H01M4/8882H01M2004/028
Inventor 小田周平
Owner SUMITOMO METAL MINING CO LTD