Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery

A lithium secondary battery and manufacturing method technology, applied in the direction of electrode manufacturing, secondary batteries, battery electrodes, etc., can solve the problems of insufficient strength and insufficient suppression of active material falling off, so as to inhibit self-destruction and improve charge-discharge cycle Excellent performance and cycle characteristics

Inactive Publication Date: 2014-04-16
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this document, ceramics are used to mechanically suppress the expansion of the active material, but the strength of the ceramics is not high enough to suppress the expansion of the active material, and there is a possibility that the falling-off of the active material due to expansion cannot be sufficiently suppressed.

Method used

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  • Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery
  • Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery
  • Negative electrode for lithium secondary battery, lithium secondary battery comprising the same, and method for producing negative electrode for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0074] Hereinafter, a first embodiment of the negative electrode for a lithium secondary battery (hereinafter, simply referred to as "negative electrode") of the present invention will be described with reference to the drawings.

[0075] First refer to figure 1 . figure 1 It is a schematic sectional view of the negative electrode for lithium secondary batteries of this embodiment.

[0076] The negative electrode 100 has: a current collector 1; and a plurality of active material complexes 10 formed on the current collector 1. In the present embodiment, a plurality of protrusions 13 are regularly arranged on the surface of the current collector 1 , and each active material complex 10 is arranged on the corresponding protrusions 13 . Each active material complex 10 extends in a direction protruding from current collector 1 , and has active material body 2 composed of a substance that absorbs and releases lithium; and conductor 4 arranged in contact with active material body 2 ...

Embodiment approach 2

[0143] Hereinafter, a second embodiment of the negative electrode for a lithium secondary battery of the present invention will be described with reference to the drawings.

[0144] First, refer to Image 6 . Image 6 It is a schematic sectional view of the negative electrode for lithium secondary batteries of this embodiment. For convenience, use figure 1 The same constituent elements of the negative electrode 100 shown are denoted by the same reference numerals, and description thereof will be omitted.

[0145] The negative electrode 400 has a current collector 1 and a plurality of active material complexes 20 formed on the surface of the current collector 1 . Each active material complex 20 has an active material body 2 including a plurality of active material parts 2a to 2e, and a conductor 4 including a plurality of conductive parts 4a to 4e. Active material portions 2a to 2e are stacked in this order on the surface of current collector 1, and conductive portions 2a t...

Embodiment 1-1

[0185] In Example 1-1, a copper foil having a plurality of protrusions formed on the surface of a rolled copper foil having a core material thickness of 35 μm by rolling with rolling rolls was used as the current collector. For the copper foil of section 13, the rolling roll is provided with minute recesses on the surface in advance. Each convex portion 13 has a rhombus (diagonal line: 10 μm×20 μm) quadrangular column shape (height: 6 μm) on the upper surface. The protrusions 13 are arranged at intervals of 20 μm along the long diagonal of the rhombus and at intervals of 18 μm along the short diagonal. On this rolled copper foil, use Figure 4 In the vapor deposition apparatus 300 shown in (a) and (b), an active material body and a conductor are formed by the method described below.

[0186] refer again Figure 4 (a). First, 50 g of silicon with a purity of 99.9999% is accommodated in the silicon evaporation source 31 of the evaporation apparatus 300 , and 150 g of nickel ...

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Abstract

A current collector 1 and a plurality of active material complexes 10 disposed on the current collector 1 and extending in a protruding direction from current collector 1 are included. Each active material complex 10 includes an active material member 2 made of a substance which occludes and releases lithium, and a conductor 4 disposed in contact with the active material member 2, the conductor 4 being made of a substance which does not occlude or release lithium. The conductor 4 extends in a direction non-parallel to the surface of the current collector 1 from the surface or surface vicinity of the current collector 1.

Description

technical field [0001] The present invention relates to a negative electrode for lithium secondary batteries, a lithium secondary battery having the negative electrode, and a method for producing the negative electrode for lithium secondary batteries. Background technique [0002] The demand for small electronic and electrical equipment such as portable communication equipment has increased in recent years, and the production volume of secondary batteries used in them has also increased. Among them, the production volume of lithium secondary batteries with high energy density has increased significantly. [0003] With the diversification of applications of small electronic and electrical equipment and the pursuit of further miniaturization, it is desired to further improve the performance of lithium secondary batteries. Specifically, an increase in discharge capacity and an extension in life are increasingly required. [0004] Currently commercially available lithium secon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M4/04H01M4/62H01M4/70H01M10/36
CPCH01M4/134H01M4/661H01M4/1395H01M2004/027H01M10/0525H01M2004/025H01M2004/021H01M4/664Y02T10/7011Y02E60/122Y02E60/10
Inventor 樋口洋吉田雅宪
Owner PANASONIC CORP
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