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

Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte and secondary battery technology, applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as no effective solutions, achieve good characteristics, avoid degradation, and suppress side reactions

Active Publication Date: 2006-07-12
PANASONIC CORP
View PDF3 Cites 11 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, there is no effective solution for suppressing the side reactions between the non-aqueous electrolyte and the positive electrode active material when the dynamic charge-discharge cycle is repeated at high temperature.

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
  • Non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery
  • Non-aqueous electrolyte secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (i) Preparation of non-aqueous electrolyte

[0048] Dissolve LiPF at a concentration of 1.0 mol / L in a mixed solvent of ethylene carbonate (EC) and methyl ethyl carbonate (EMC) (volume ratio 1:4) 6 . To the obtained solution, 5 parts by weight of fluorobenzene (FB) was added per 100 parts by weight of the nonaqueous solvent to obtain a nonaqueous electrolyte.

[0049] (ii) Fabrication of the positive electrode

[0050] will be mixed with 85 parts by weight of positive electrode active material LiNi 0.8 co 0.2 o 2 The anode mixture of the conductive material acetylene black of powder, 10 parts by weight and the binder polyvinylidene fluoride of 5 parts by weight is dispersed in dehydrated N-methyl-2-pyrrolidone (NMP), thereby preparing the anode mixture material pulp. This slurry was coated on both surfaces of a positive electrode current collector made of aluminum foil, dried, and then rolled to obtain a positive electrode.

[0051] (iii) Preparation of negative ...

Embodiment 2

[0070] A battery similar to that of Example 1 was produced except that the nickel-containing lithium composite oxide having the composition shown in Table 2 was used as the positive electrode active material, and the same evaluation was performed. The results are shown in Table 2.

[0071] positive active material

Fluorobenzene (parts by weight)

Capacity maintenance rate (%)

Example 2

LiNi 0.005 co 0.995 o 2

5

80.2

LiNi 0.05 co 0.95 o 2

5

80.9

LiNi 0.1 co 0.9 o 2

5

83.0

LiNi 0.3 co 0.7 o 2 x

5

85.1

LiNi 0.5 co 0.5 o 2

5

85.3

LiNi 0.7 co 0.3 o 2

5

86.0

LiNi 0.8 co 0.2 o 2

5

86.5

LiNi 0.9 co 0.1 o 2

5

86.1

LiNiO 2

5

81.3

LiNi 0.8 co 0.15 Al 0.05 o 2

5

88.2

LiNi 0.8 co 0.15 Sr 0.05 o 2

5

8...

Embodiment 3

[0076] Except for using the compounds shown in Table 3 as the fluorine atom-containing aromatic compound contained in the non-aqueous electrolyte, the same batteries as in Example 1 were fabricated and evaluated in the same manner. The results are shown in Table 3.

[0077] Aromatic compounds containing fluorine atoms

Capacity maintenance rate (%)

Example 3

Fluorobenzene

86.5

1,2-Difluorobenzene

85.1

1,2,3-Trifluorobenzene

85.0

1,2,3,4-Tetrafluorobenzene

84.8

Pentafluorobenzene

84.5

Hexafluorobenzene

84.2

2-fluorotoluene

82.7

α,α,α-trifluorotoluene

80.3

3-fluoro-o-xylene

81.4

Bis(trifluoromethyl)benzene

80.8

2-fluorostyrene

82.2

4-fluorostyrene

82.9

[0078] As can be seen from Table 3, regardless of the type of aromatic compound containing fluorine atoms, by combining the positive electr...

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

No PUM Login to View More

Abstract

To provide a high-capacity non-aqueous electrolyte secondary battery that exhibits satisfactory charge / discharge cycle characteristics even in a high temperature environment. The battery has: a positive electrode including a nickel-containing lithium composite oxide; a negative electrode capable of charging and discharging; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte containing a non-aqueous solvent and a solute dissolved therein. The non-aqueous electrolyte contains a fluorine atom-containing aromatic compound. The nickel-containing lithium composite oxide is represented by, for example, LiNixM1-x-yLyO2 where element M is at least one selected from the group consisting of Co and Mn; element L is at least one selected from the group consisting of Al, Sr, Y, Zr, Ta, Mg, Ti, Zn, B, Ca, Cr, Si, Ga, Sn, P, V, Sb, Nb, Mo, W and Fe; and x and y satisfy 0.1<=x<=1 and 0<=y<=0.1.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery, and more particularly, to an improvement of a nonaqueous electrolyte. Background technique [0002] In recent years, research on secondary batteries containing nonaqueous electrolytes (nonaqueous electrolyte secondary batteries), especially lithium ion secondary batteries having high voltage and high energy density, is in the ascendant. Now, most commercially available lithium secondary batteries will exhibit high charge and discharge voltages of LiCoO 2 Used as positive active material. In addition, nonaqueous electrolytes generally use nonaqueous solvents in which solutes are dissolved. As the nonaqueous solvent, cyclic carbonates, chain carbonates, cyclic carboxylates, and the like can be used. The solute can use lithium hexafluorophosphate (LiPF 6 ), lithium tetrafluoroborate (LiBF 4 )Wait. [0003] People have high expectations for high capacity of non-aqueous elect...

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): H01M10/40H01M4/58H01M4/48H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525H01M10/0567H01M10/36
CPCH01M4/505Y02E60/122H01M4/525H01M10/0567H01M10/0525Y02E60/10B24C1/003B08B7/00
Inventor 出口正树松井徹芳泽浩司
Owner PANASONIC CORP
Features
  • Generate Ideas
  • 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