Unlock instant, AI-driven research and patent intelligence for your innovation.

Positive electrode active material for non-aqueous electrolyte secondary batteries, production method therefor, and non-aqueous electrolyte secondary battery

A positive active material, secondary battery technology, applied in the direction of active material electrodes, electrode manufacturing, secondary batteries, etc., can solve the problems of reduced productivity, high Mn/Ni ratio, difficulty in obtaining inter-particle uniformity, etc. The effect of gelling and improving dispersibility

Active Publication Date: 2017-08-18
SUMITOMO METAL MINING CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, since the aqueous solution is switched in the middle of the crystallization reaction, the productivity decreases in industrial-scale production, and it is difficult to obtain uniformity among particles.
Furthermore, when the Mn / Ni ratio of the secondary particle periphery of the lithium-manganese-nickel composite oxide is high, there is a problem that it may be difficult to obtain high output.
[0017] As mentioned above, there is no report example of reducing the alkalinity of the positive electrode active material and satisfying high output.
In addition, lithium-nickel-cobalt-manganese composite oxides that can sufficiently improve the performance of non-aqueous electrolyte secondary batteries have not yet been developed on an industrial scale at the present stage, and their development is required.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Positive electrode active material for non-aqueous electrolyte secondary batteries, production method therefor, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary batteries, production method therefor, and non-aqueous electrolyte secondary battery
  • Positive electrode active material for non-aqueous electrolyte secondary batteries, production method therefor, and non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0178] (co-precipitation process)

[0179] In Example 1, first add water to half the amount in the reaction tank, set the temperature in the tank to 40°C while stirring, add 25% aqueous sodium hydroxide solution and 25% ammonia water to it in an appropriate amount, and lower the liquid temperature to 25°C The pH measured as a reference was adjusted to 12.8, and the ammonia concentration in the liquid was adjusted to 10 g / L. Add 2.0 mol / L of nickel sulfate, cobalt sulfate, manganese sulfate, zirconium sulfate (Ni:Co:Mn:Zr=38:32:30:0.5 in molar ratio of metal elements) dissolved in water to it at a certain speed. Crystallization was carried out for 2 minutes and 30 seconds while controlling the pH value at 12.8 (nucleation pH) in an aqueous solution of 25% ammonia water and 25% sodium hydroxide solution.

[0180] After that, in Example 1, nitrogen gas was circulated to lower the oxygen concentration in the reaction tank, and the pH value measured based on the liquid temperature...

Embodiment 2

[0206] In Example 2, in the firing process, the first firing stage was held at 450°C for 2 hours, and the second firing stage was held at 900°C for 4 hours, except that a non-aqueous electrolyte secondary battery was obtained in the same manner as in Example 1. positive active material used.

[0207] In Example 2, the average particle diameter of the obtained positive electrode active material, [(d90-d10) / average particle diameter] value, the central part Mn / shell part Mn of the secondary particle, the primary particle of the shell part of the secondary particle Table 1 summarizes the inner Mn / outer peripheral Mn of the primary particle, the pH of the positive electrode active material, the initial discharge capacity, and the positive electrode resistance value. In addition, in Example 2, the judgment results of the paste property and output of the obtained positive electrode active material are summarized and shown in Table 2.

Embodiment 3

[0209] In Example 3, in the firing process, the first firing stage was held at 500°C for 2 hours, and the second firing stage was held at 950°C for 2 hours. In addition, the non-aqueous electrolyte secondary battery was obtained in the same manner as in Example 1. positive active material.

[0210] In Example 3, the average particle diameter of the obtained positive electrode active material, [(d90-d10) / average particle diameter] value, the central part Mn / shell part Mn of the secondary particle, the primary particle of the shell part of the secondary particle Table 1 summarizes the inner Mn / outer peripheral Mn of the primary particle, the pH of the positive electrode active material, the initial discharge capacity, and the positive electrode resistance value. In addition, in Example 3, the judgment results of the paste property and output of the obtained positive electrode active material are summarized and shown in Table 2.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a positive electrode active material for non-aqueous electrolyte secondary batteries which is capable of achieving non-aqueous electrolyte secondary batteries exhibiting excellent battery characteristics; a production method for the material; and a non-aqueous electrolyte secondary battery. In the positive electrode active material for non-aqueous electrolyte secondary batteries, secondary particles of lithium nickel cobalt manganese composite oxide particles comprise outer shell parts having a high manganese concentration, and core parts having a low manganese concentration which is lower than that of outer shell parts. Primary particles which form the secondary-particle outer shell parts having a high manganese concentration comprise outer peripheral parts having a low manganese concentration, and internal parts having a high manganese concentration. The ratio of the manganese concentration of the primary-particle internal parts to the manganese concentration of the primary-particle outer peripheral parts is 1.5-2.5.

Description

technical field [0001] The present invention relates to a positive electrode active material for a nonaqueous electrolyte secondary battery, a method for producing the same, and a nonaqueous electrolyte secondary battery. More specifically, it relates to a positive electrode active material using nickel-cobalt-manganese composite oxide particles as a raw material, a method for producing the same, and a nonaqueous electrolyte secondary battery using the positive electrode active material as a positive electrode material. This application claims priority based on Japanese Patent Application No. Japanese Patent Application No. 2014-157102 for which it applied in Japan on July 31, 2014, and takes in this application as a reference. Background technique [0002] In recent years, with the popularization of portable electronic devices such as mobile phones and notebook computers, the development of small and lightweight non-aqueous electrolyte secondary batteries with high energy d...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/525H01M4/505H01M4/36
CPCC01G53/006C01G53/50C01P2004/03C01P2004/04C01P2004/61C01P2004/84H01M4/505H01M4/525H01M10/0525Y02E60/10H01M4/0471H01M2004/028Y02T10/70
Inventor 井之上胜哉户屋广将
Owner SUMITOMO METAL MINING CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com