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

Positive electrode active material, positive electrode using the same, and lithium ion secondary battery

A positive active material and secondary battery technology, applied in the direction of secondary batteries, non-aqueous electrolyte storage battery electrodes, batteries, etc., can solve the problems of insufficient performance of discharge capacity and reduction of discharge capacity, etc., to maintain electronic conductivity, high heat The effect of stability and high capacity

Inactive Publication Date: 2017-09-01
TDK CORPARATION
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the method described in Patent Document 1, the stability at high temperature is improved, but the discharge capacity is lowered due to the coating with the olivine compound, and the performance of the discharge capacity is insufficient.

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, positive electrode using the same, and lithium ion secondary battery
  • Positive electrode active material, positive electrode using the same, and lithium ion secondary battery
  • Positive electrode active material, positive electrode using the same, and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0113] (1) Production of positive electrode

[0114] For the positive electrode active material, the lithium nickel composite oxide (Li 1.01 Ni 0.8 co 0.15 al 0.05 o 2 ) and orthorhombic LiVOPO as the second active material material 4Weighed at a mass ratio of 80:20, mixed with a mortar, and used the mixed mixture as a positive electrode active material. In Example 1, the average particle diameter a of the first active material material was 5 μm, and the average particle diameter b of the second active material material was 0.05 μm. The average particle diameter a and b in Example 1 used the value of the average primary particle diameter, respectively. Next, 90 parts by mass of the positive electrode active material powder, 5 parts by mass of acetylene black, and 5 parts by mass of polyvinylidene fluoride (PVDF) were dispersed in N-methyl-2-pyrrolidone (NMP) to prepare a slurry. The obtained slurry was coated on an aluminum foil having a thickness of 20 μm, dried at a t...

Embodiment 2～9、 comparative example 1～3

[0137] In Examples 2 to 9 and Comparative Examples 1 to 3, battery cells were fabricated in the same manner as in Example 1, except that the ratio of the average particle diameter a of the first active material material to the average particle diameter b of the second active material material was changed. , and evaluate it. The average particle size of the first active material material and the second active material material is measured by randomly extracting 100 particles from the SEM photographs and measuring the particle size, and calculating the average value thereof. The results are shown in Table 1.

[0138] [Table 1]

[0139]

[0140] According to Table 1, if the ratio a / b of the average particle size a of the first active material material to the average particle size b of the second active material material is in the range of 1≤a / b≤60, a high discharge capacity can be obtained , and the exothermic peak intensity is also small. In addition, if it is outside the ...

Embodiment 10～13、 Embodiment 30～33

[0141] (Examples 10-13, Examples 30-33, Comparative Examples 9-11)

[0142] In Examples 10 to 13, Examples 30 to 33, and Comparative Examples 9 to 11, except for changing the ratio of the mass c of the first active material material to the mass d of the second active material material, they were produced in the same manner as in Example 1. battery cells, and evaluate them. The results are shown in Table 2.

[0143] [Table 2]

[0144]

[0145] According to Table 2, if the ratio of the mass c of the first active material to the mass d of the second active material is in the range of 1.5≤c / d≤199, a high discharge capacity can be obtained, and the exothermic peak intensity Also small.

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 sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The present invention provides a positive electrode active material for a lithium ion secondary battery, a lithium ion secondary battery positive electrode using the same, and a lithium ion secondary battery, having high discharging capacity and high thermal stability. A positive electrode active material for a lithium ion secondary battery includes: a first active material selected from active materials represented by composition formula (1); and a second active material represented by composition formula (2). A ratio a / b of an average particle diameter a of the first active material to an average particle diameter b of the second active material is in a range of 1<=a / b<=60. LiwNix(M1)y(M2)zO2 (1) where M1 is at least one element selected from Co and Mn, M2 is at least one element selected from Al, Fe, Cr, Ba, Mn, and Mg, 0.9<w<1.1, 2.0<(x+y+z+w)<=2.1, 0.3<x<0.95, 0.01<y<0.4, and 0.001<z<0.2. Li<alpha>VOPO4 (2) where 0<[alpha]<=1.2.

Description

technical field [0001] The present invention relates to a positive electrode active material for a lithium ion secondary battery, a positive electrode for a lithium ion secondary battery using the same, and a lithium ion secondary battery. Background technique [0002] In recent years, in order to solve environmental and energy problems, the spread of various electric vehicles has been expected. Lithium-ion secondary batteries have been intensively developed as in-vehicle power supplies such as motor drive power supplies, which are key to the practical use of these electric vehicles. In order to widely spread batteries as in-vehicle power sources, it is considered very important to have high charge and discharge capacity and high thermal stability. [0003] Conventionally, lithium nickelate is known as an active material capable of obtaining a higher charge-discharge capacity than lithium cobaltate, which is generally widely used as a positive electrode material for lithium...

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): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/58H01M4/62H01M10/0525
CPCH01M4/364H01M4/485H01M4/505H01M4/525H01M4/5825H01M4/625H01M10/0525H01M2220/20H01M4/13Y02E60/10Y02T10/70
Inventor 东海林哲关秀明
Owner TDK CORPARATION