Supercharge Your Innovation With Domain-Expert AI Agents!

Electrode for lithium rechargeable battery and lithium rechargeable battery comprising the electrode

A lithium secondary battery and electrode technology, applied in the field of electrodes for lithium secondary batteries, can solve problems such as difficulty in applying large-scale production processes, and achieve improved charge-discharge cycle characteristics and reliability, excellent charge-discharge cycle characteristics, and suppression of aggregation. The effect of electrical deformation

Inactive Publication Date: 2010-07-14
PANASONIC CORP
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a patterning process is required when forming a columnar body, so it is difficult to apply to a mass production process

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
  • Electrode for lithium rechargeable battery and lithium rechargeable battery comprising the electrode
  • Electrode for lithium rechargeable battery and lithium rechargeable battery comprising the electrode
  • Electrode for lithium rechargeable battery and lithium rechargeable battery comprising the electrode

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0062] Refer to the attached Figure 1 A first embodiment of the electrode for a lithium secondary battery of the present invention will be described. The electrode of this embodiment can be applied to either a negative electrode or a positive electrode of a lithium secondary battery, and is preferably used as a negative electrode for a lithium secondary battery.

[0063] First, refer to figure 1 (a) and figure 1 (b). figure 1 (a) is a schematic sectional view of the electrode of this embodiment, figure 1 (b) is a plan view of the active material layer in a state where lithium is not occluded. in addition, figure 1 (a) means along figure 1 (b) I-I' line cross-section of the active material layer.

[0064] The electrode 100 includes: a current collector 11 having a plurality of protrusions 12 on the surface; and an active material layer 15 formed on the surface of the current collector 11 . The plurality of protrusions 12 are regularly arranged at intervals on the surfa...

Embodiment and comparative example -1

[0154] Here, electrodes 1 to 11 were produced as examples, and electrode C1 was produced as a comparative example, and the measurement of the minimum linear void ratio in each active material layer and the deformation (elongation) of the electrodes caused by constant current charging were performed. Evaluation. Furthermore, the sample batteries a and b using the electrode 8 and the electrode 10 were produced, and a charge-discharge cycle test was performed, so the method and results thereof will be described.

[0155] (i) Electrode fabrication method

[0156] (i-1) Electrode 1

[0157]

[0158] First, a method for producing a current collector used in the electrode 1 will be described. Figure 8 (a) to (c) are cross-sectional process diagrams for explaining the production method of the current collector in this example.

[0159] like Figure 8 As shown in (a), both sides of a copper foil (HCL-02Z, manufactured by Hitachi Electric Cable Co., Ltd.) having a thickness of 27...

Embodiment and comparative example -2

[0219] Here, electrodes 12 to 16 were produced as an example, electrodes C2 and C3 were produced as a comparative example, and the measurement of the minimum linear void ratio in each active material layer and the evaluation of the electrode plate strength were performed. Furthermore, sample batteries each having the electrodes 12 to 16 and the electrodes C2 and C3 as negative electrodes were produced, and the presence or absence of electrode deformation due to charging and discharging was investigated, and the methods and results thereof will be described.

[0220] (i) Electrode fabrication method

[0221] (i-12) Electrode 12

[0222]

[0223] A rolled alloy copper foil (HCL-305 manufactured by Hitachi Electric Cable Co., Ltd.) with a thickness of 18 μm is cut into a size of 80 mm×15 mm, and one side is formed by plating Figure 13 A plurality of protrusions 12 are shown with a rhomboid upper face. Specifically, first, on the above-mentioned copper foil, by exposing and d...

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
heightaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

This invention provides an electrode (100) for a lithium rechargeable battery, comprising a current collector (11) having a plurality of convex parts (12) on its surface and an active material layer (15) comprising an active material (14) provided respectively on the plurality of convex parts (12). The plurality of convex parts (12) are regularly provided on the surface of the current collector (11) while providing a space therebetween. A direction (S) of growth of the active material (14) is inclined toward a normal direction (D) of the current collector (11). A space (16) is provided between the adjacent active materials (14). Not less than 5% of the active material layer (15) in an arbitrary direction is accounted for by the space (16) on a plane parallel to the surface of the current collector (11). The tensile strength of the current collector (11) per [mu]m of the height of the active material (14) is not less than 0.3 N / mm and not more than 1 N / mm.

Description

technical field [0001] The present invention relates to an electrode for a lithium secondary battery and a lithium secondary battery having the electrode. Background technique [0002] In recent years, with the development of portable devices such as personal computers and mobile phones, the demand for batteries as their power sources has increased. High energy density is required for batteries used in such applications as described above. In response to such demands, lithium secondary batteries have attracted attention, and active materials with higher capacities than conventional ones have been developed for each of the positive and negative electrodes. Among them, a simple substance, oxide or alloy of silicon (Si) or tin (Sn) is considered promising as an active material capable of obtaining a very large capacity. [0003] However, when these active materials are used to constitute electrodes for lithium secondary batteries, there is a problem that the electrodes are de...

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): H01M4/02H01M4/66H01M4/70H01M4/13H01M4/134H01M4/139H01M4/1395H01M4/48
CPCH01M4/70Y02E60/122H01M4/661H01M4/1395H01M4/13H01M2004/021H01M4/134Y02E60/10
Inventor 山本泰右伊藤修二宇贺治正弥柏木克巨
Owner PANASONIC CORP
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