Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using said positive electrode

A non-aqueous electrolyte and secondary battery technology, which is applied in the direction of non-aqueous electrolyte battery electrodes, non-aqueous electrolyte batteries, battery electrodes, etc., can solve the problems that the electrolyte is easily decomposed and the discharge capacity is reduced, and can suppress the reduction of energy density , The effect of suppressing the reduction of discharge voltage and the reduction of discharge capacity

Active Publication Date: 2013-08-28
PANASONIC ENERGY CO LTD
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the charging voltage of the battery is increased, there is a problem that the electrolyte solution becomes easily decomposed, especially when the battery is stored at a high temperature or the charge-discharge cycle is repeated at a high temperature, the problem of a decrease in the discharge capacity occurs.

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 for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using said positive electrode
  • Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using said positive electrode
  • Positive electrode for nonaqueous electrolyte secondary battery and nonaqueous electrolyte secondary battery using said positive electrode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] [making of positive electrode]

[0074] First, prepare 1000 g of lithium cobaltate particles, the lithium cobaltate particles are 1.5 mol % each of Mg and Al in solid solution with respect to lithium cobaltate and contain 0.05 mol % Zr, add the particles to 3.0 L of pure water and stir, A suspension in which lithium cobaltate is dispersed is prepared. Next, erbium nitrate pentahydrate [Er(NO 3 ) 3 ·5H 2 O] A solution obtained by dissolving 1.85 g in 200 mL of pure water. At this time, in order to adjust the pH of the solution in which lithium cobaltate was dispersed to 9, a 10% by mass aqueous solution of nitric acid or a 10% by mass aqueous solution of sodium hydroxide was appropriately added.

[0075] Next, after the addition of the above-mentioned erbium nitrate pentahydrate solution was completed, suction filtration was performed, and the obtained powder was dried at 120° C. to obtain an erbium hydroxide compound adhered to a part of the surface of the above-menti...

Embodiment 2

[0087] As the positive electrode active material, a material obtained by mixing lithium cobalt oxide (hereinafter, sometimes referred to as surface-modified lithium cobalt oxide) and nickel cobalt lithium manganese oxide at a mass ratio of 70:30 to which an erbium compound is attached to a part of the surface is used. Other than that, a battery was fabricated in the same manner as in Example 1 above.

[0088] The battery produced in this way is hereinafter referred to as battery A2.

Embodiment 3

[0090] As the positive electrode active material, a battery was fabricated in the same manner as in Example 1 above, except that a mixture of surface-modified lithium cobaltate and lithium nickel cobalt manganate in a mass ratio of 80:20 was used.

[0091] The battery produced in this way is hereinafter referred to as battery A3.

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 purpose of the present invention is to provide a positive electrode for a nonaqueous electrolyte secondary battery that can suppress reductions in discharge capacity and reductions in discharge voltage even in cases such as continuous charging at high temperatures and can also suppress reductions in discharge voltage and reductions in energy density in charging and discharging thereafter. The purpose is also to provide a nonaqueous electrolyte secondary battery using this positive electrode. The positive electrode for a nonaqueous electrolyte secondary battery is characterized by containing a positive electrode active material, which is formed from a mixture of lithium cobaltate (21) to which an erbium compound (22) adheres to part of the surface, and lithium nickel cobalt manganese oxide and also containing a binder. The positive electrode for a nonaqueous electrolyte secondary battery is also characterized by the proportion of the lithium nickel cobalt manganese oxide being 1 - 50% by mass of the total amount of the positive electrode active material.

Description

technical field [0001] The present invention relates to a positive electrode for a nonaqueous electrolyte secondary battery and a nonaqueous electrolyte secondary battery using the positive electrode. Background technique [0002] In recent years, the miniaturization and weight reduction of mobile information terminals such as mobile phones, notebook computers, and PDAs has been rapidly progressing, and higher capacity is required for batteries used as driving power sources. Lithium-ion batteries, which are charged and discharged as lithium ions move between the positive and negative electrodes, have high energy density and high capacity, and are therefore widely used as driving power sources for the above-mentioned mobile information terminals. [0003] Here, with the enrichment of functions such as video playback function and game function, the power consumption of the above-mentioned mobile information terminal tends to increase further, and further increase in capacity i...

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): H01M4/505C01G51/00C01G53/00H01M2/16H01M4/13H01M4/131H01M4/36H01M4/525
CPCH01M4/131H01M4/364H01M4/366H01M4/505H01M4/525H01M4/62H01M10/052H01M50/46Y02E60/10Y02P70/50Y02T10/70
Inventor 地藤大造小笠原毅
Owner PANASONIC ENERGY CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com