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Negative electrode for electrical device and electrical device provided with same

A technology for electrical equipment and negative electrodes, applied in the field of negative electrodes for electrical equipment, can solve problems such as large expansion and contraction, difficulty in showing high capacity and high cycle durability, and reduced cycle life of electrodes

Active Publication Date: 2015-07-29
NISSAN MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, a lithium-ion secondary battery using a material alloyed with Li for the negative electrode has a large expansion and contraction of the negative electrode during charging and discharging.
For example, the volume expansion when absorbing Li ions is about 1.2 times in the case of a graphite material, and on the other hand, in the case of a Si material, when Si and Li are alloyed, the transition from an amorphous state to a crystalline state occurs greatly. volume change (about 4 times), therefore, there is a problem of reducing the cycle life of the electrode
In addition, in the case of the Si negative electrode active material, capacity and cycle durability are in a trade-off relationship, and there is a problem that it is difficult to express high capacity and improve high cycle durability.

Method used

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  • Negative electrode for electrical device and electrical device provided with same
  • Negative electrode for electrical device and electrical device provided with same
  • Negative electrode for electrical device and electrical device provided with same

Examples

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Embodiment

[0226] The present invention is further described in detail using the following examples. However, the protection scope of the present invention is not limited to the following examples.

[0227] First, as a reference example, performance evaluation was performed on the Si alloy represented by the chemical formula (1) constituting the negative electrode for electrical equipment of the present invention.

reference example A

[0228] (Reference Example A): For Si x Ti y Ge z A a performance evaluation of

[0229] [1] Production of negative electrode

[0230] As the sputtering device, a three-element DC magnetron sputtering device with an independent control method (manufactured by Daiwa Ki Kogyo Co., Ltd., combined sputtering coating device, gun-sample distance: about 100mm) was used, and a nickel foil with a thickness of 20 μm was used. A total of 31 kinds of negative electrode samples (Reference Examples 1 to 18 and Reference Comparative Examples 1 to 13) were obtained by forming thin films of negative electrode active material alloys with various compositions on the formed substrate (current collector) under the following conditions. .

[0231] (1) Target (manufactured by High Purity Chemical Laboratory Co., Ltd., purity: 4N)

[0232] Si: 50.8mm diameter, 3mm thickness (with a 2mm thick oxygen-free copper backing plate)

[0233] Ti: 50.8mm diameter, 5mm thickness

[0234] Ge: 50.8 mm diam...

reference example B

[0265] (Reference Example B): For Si x Ti y sn z A a performance evaluation of

[0266] [1] Production of negative electrode

[0267] In (1) of Reference Example 1, "Ge: 50.8 mm diameter, 3 mm thickness (with an oxygen-free copper backing plate with a thickness of 2 mm)" was changed to "Sn: 50.8 mm diameter, 5 mm thickness", and ( In 2), except that "Ge (0-120W)" of the DC power supply was changed to "Sn (0-40W)", a total of 40 kinds of negative electrode samples were produced by the same method as Reference Example 1 (Reference Examples 19-44 and Reference Comparative Examples 14-27).

[0268] Regarding (2) above, if several examples of sample production are shown, in Reference Example 35, DC power supply 1 (Si target): 185W, DC power supply 2 (Sn target): 30W, DC power supply 3 (Ti target): 150W. In addition, in Comparative Reference Example 15, DC power supply 1 (Si target): 185W, DC power supply 2 (Sn target): 22W, and DC power supply 3 (Ti target): 0W. Furthermore...

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Abstract

[Problem] To provide a negative electrode for an electrical device such as a lithium ion secondary battery that maintains high cycle characteristics, that has a high initial capacity, and that exhibits well-balanced characteristics. [Solution] A negative electrode for an electrical device comprising a current collector and an electrode layer that includes a negative electrode active material that is arranged on the surface of the current collector, a conductive auxiliary agent, and a binder. The negative electrode active material comprises an alloy represented by formula (1): SixTiyMzAa (in formula (1), M is at least one metal selected from the group consisting of Ge, Sn, Zn, and combinations thereof, A is unavoidable impurities, x, y, z, and a represent mass% values, and in this case, 0 < x < 100, 0 < y < 100, 0 < z < 100, 0 ≤ a ≤ 0.5, and x + y + z + a = 100). The binder contains a resin having an E elastic modulus that is greater than 1.00 GPa and less than 7.40 GPa.

Description

technical field [0001] The present invention relates to a negative electrode for electric equipment, and an electric equipment using the negative electrode. The negative electrode for electrical equipment of the present invention and electrical equipment using the same can be used, for example, as secondary batteries, capacitors, and the like as driving power sources and auxiliary power sources for engines of electric vehicles, fuel cell vehicles, and hybrid electric vehicles. Background technique [0002] In recent years, in order to cope with air pollution and global warming, the reduction of the amount of carbon dioxide has been strongly desired. In the automotive industry, reductions in carbon dioxide emissions due to the introduction of electric vehicles (EV) and hybrid electric vehicles (HEV) are expected, and the key to their practical application is the control of electric equipment such as secondary batteries for driving engines. Development is actively underway. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/134H01M4/38H01M4/62
CPCY02E60/122H01M4/621H01M4/134C22C28/00C22C18/00H01M4/386H01M10/052H01M4/38Y02T10/7011C22C30/06H01M4/624C22C30/04H01M4/622H01M4/623H01M2220/20Y02E60/10Y02T10/70H01M2004/027
Inventor 渡边学三木文博真田贵志千叶启贵
Owner NISSAN MOTOR CO LTD