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Negative electrode for secondary batteries, and secondary battery

A secondary battery and negative electrode technology, which is applied in the direction of battery electrodes, non-aqueous electrolyte battery electrodes, negative electrodes, etc., can solve the problems of precipitates piercing the separator, short circuit, corrosion and deterioration of negative electrode collectors, etc., to reduce internal resistance , improved cycle characteristics, and improved rapid charge-discharge characteristics

Inactive Publication Date: 2015-05-27
RESONAC HOLDINGS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in a system using a carbon material as the negative electrode active material, if the discharge is close to 100%, the potential of the negative electrode becomes near 0V, and dendrites are precipitated, consuming lithium ions originally used for electron transport, and causing the negative electrode to collect Electrical Corrosion Deterioration
In the worst case, it is also possible for the precipitate to pierce the separator and become the cause of the short circuit

Method used

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  • Negative electrode for secondary batteries, and secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0133] (Preparation of a coating solution for forming a film containing a conductive material)

[0134] The following materials were used in the compounding quantities shown in Table 1.

[0135] Conductive material: Acetylene black (denka black (registered trademark) (powder) manufactured by Denki Kagaku Kogyo Co., Ltd., number average primary particle size: 35 nm)

[0136] Adhesive material: Glycerol-based chitosan (manufactured by Dainichi Seika Co., Ltd., deacetylation degree 86mol%, weight average molecular weight 8.6×10 4 )

[0137] Solvent: N-methylpyrrolidone (special grade reagent), 2-propanol (special grade reagent)

[0138] The above-mentioned material was dispersed at a speed of 300 rpm for 10 minutes using a high-speed disperser type mixer, and then treated with a homogenizer (manufactured by Iada Trading Co., Ltd., product name PRO200) at 20,000 rpm for 30 seconds to prepare a fully dispersed product. Coating solution.

[0139] (production of negative electrod...

Embodiment 2

[0156] The composition ratio of the coating solution for forming a film containing a conductive material is shown in Table 1, except that the negative electrode active material was changed to the bronze-type titanium dioxide described in JP-A-2008-117625, the same as in Example 1. Secondary batteries were fabricated and evaluated.

Embodiment 3

[0158] The composition ratio of the coating solution for forming a film containing a conductive material is shown in Table 1, and the negative electrode active material was changed to spinel-type lithium titanate (manufactured by Ishihara Sangyo Co., Ltd., trade name XA-105). A secondary battery was fabricated and evaluated in the same manner as in Example 1.

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Abstract

The purpose of the present invention is to provide a secondary battery which can be charged and discharged with a large current at a high rate and has low internal resistance and impedance without requiring addition of a large amount of a material such as a conductive assistant that does not contribute to the electrical capacity into a negative electrode active material layer even in cases where a titanium-containing oxide is used as a negative electrode active material. The present invention provides a negative electrode for secondary batteries, which comprises a metal foil and a negative electrode active material layer that is formed on one surface or both surfaces of the metal foil and contains a titanium-containing oxide as a negative electrode active material. A coating film that contains a conductive material is formed between the metal foil and the negative electrode active material layer.

Description

technical field [0001] The present invention relates to a negative electrode for a secondary battery and a secondary battery using the negative electrode. More specifically, the present invention relates to a negative electrode for a lithium ion secondary battery using a titanium-containing oxide as a negative electrode active material. Background technique [0002] In recent years, in order to suppress global warming, it is required to reduce the amount of generated carbon dioxide. For example, in the automobile industry, the shift from gasoline vehicles to electric vehicles and hybrid vehicles that emit less carbon dioxide is expanding. Electric vehicles are equipped with secondary batteries, and among them, the development of lithium-ion secondary batteries has attracted attention from the viewpoint of mileage, safety, and reliability. A lithium ion secondary battery generally includes a positive electrode current collector and a negative electrode current collector, a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/13H01M50/119H01M50/121H01M50/126
CPCH01M4/131H01M4/366H01M4/485H01M4/624H01M50/119H01M50/126H01M50/121H01M4/663H01M4/667H01M4/668H01M4/625H01M4/661Y02E60/10H01M2004/021H01M2004/027
Inventor 横内仁大森将弘国泽政智
Owner RESONAC HOLDINGS CORPORATION