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Negative electrode for lithium ion secondary cell

A secondary battery and lithium-ion technology, which is applied in secondary batteries, battery electrodes, non-aqueous electrolyte battery electrodes, etc., can solve the problems of lithium-ion secondary battery cycle characteristics degradation, etc., and achieve excellent cycle characteristics and good adhesion Effect

Inactive Publication Date: 2012-09-19
TOYOTA IND CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cycle characteristics of lithium-ion secondary batteries are significantly deteriorated due to the micronization and detachment of active materials

Method used

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  • Negative electrode for lithium ion secondary cell
  • Negative electrode for lithium ion secondary cell
  • Negative electrode for lithium ion secondary cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Add 80wt% of treatment active material A to 15wt% of a paste made of alkoxysilane-modified polyamic acid resin dissolved in N-methylpyrrolidone (NMP), and further add 5wt% of Ketjen Black (KB) , mix, and prepare the paste.

[0082] Then, the above-mentioned paste was applied with a doctor blade on a copper foil having a thickness of 18 μm (electrolytic copper foil was used in this example) so that it became 1.25 mg / cm 2 , thus forming a film.

[0083] The obtained sheet was dried at 80° C. for 20 minutes, and NMP and the like were volatilized and removed. Then, the current collector made of copper foil and the negative electrode active material layer made of alkoxysilane-containing modified polyamic acid resin, treatment active material A, and Ketjen Black were firmly bonded together using a roll pressing machine. Through this tight bonding, the density of the negative electrode active material layer is adjusted to 1.2 g / cm 3 .

[0084] It was punched into a roughly...

Embodiment 2

[0086] The electrode of Example 2 was obtained like Example 1 except having used the process active material B instead of process active material A as an active material.

Embodiment 3

[0088] The electrode of Example 3 was obtained like Example 1 except having used the process active material C instead of process active material A as an active material.

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Abstract

Provided is a negative electrode for a lithium ion secondary cell, which has excellent cycle performance as a result of preventing an active material from peeling or falling off of a collector. The negative electrode is provided with a collector (1), and an active material layer (6) in which a conductive assistant (3) and an active material (2) are affixed to the surface of the collector (1) via a binder (4) comprising a resin having an alkoxy group-containing silane-modified site. The surface of the active material (6) is treated with a surface treatment agent represented by a general formula; the general formula being X-Si(CH3)n-(OR)3-n. (In the formula, n represents 0, 1, or 2, OR represents a methoxy group or an ethoxy group, and X represents a methoxy group, an ethoxy group, or a vinyl group.)

Description

technical field [0001] The invention relates to a negative electrode for a lithium ion secondary battery. Background technique [0002] With the development of miniaturization and weight reduction of electronic devices, secondary batteries with high energy density are desired as their power sources. A secondary battery is a device that takes out chemical energy of a positive electrode active material and a negative electrode active material as electrical energy to the outside through a chemical reaction through an electrolyte. As such a secondary battery, a secondary battery having a high energy density in practical use is a lithium ion secondary battery. [0003] In lithium-ion secondary batteries, lithium-cobalt composite oxides and other lithium-containing metal composite oxides are mainly used as positive electrode active materials, and lithium ions capable of inserting lithium ions into the interlayer (formation of lithium interlayer compounds) and lithium metal compos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M4/134H01M4/36H01M4/38H01M4/62
CPCY02E60/122H01M4/62H01M4/622H01M4/621H01M4/1395H01M4/366H01M4/134H01M10/0525Y02E60/10H01M4/13H01M4/36
Inventor 弘濑贵之三好学村濑仁俊
Owner TOYOTA IND CORP
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