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Electrode for electrochemical device and electrochemical device using the same

A technology of electrochemical components and electrodes, which is applied in the field of electrochemical components, can solve the problems of unresolved negative electrodes, heat generation, and unclear relationship between specific surface area, etc., and achieve heat generation reaction suppression, excellent safety, high rate characteristics and low temperature characteristics excellent effect

Inactive Publication Date: 2010-03-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Although the negative electrode using a negative electrode active material with a large capacity has a great effect on increasing the capacity, it still has not solved the problem of heat generation of the negative electrode due to contact with the electrolyte in a high-temperature environment, as described above.
In addition, when the negative electrode is composed of only a negative electrode active material with a capacity higher than that of the carbon material, the relationship between the specific surface area of ​​the negative electrode and the amount of heat generated by the negative electrode due to contact with the electrolyte is still unclear.

Method used

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  • Electrode for electrochemical device and electrochemical device using the same
  • Electrode for electrochemical device and electrochemical device using the same
  • Electrode for electrochemical device and electrochemical device using the same

Examples

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Embodiment approach 1

[0104] use figure 2 The negative electrode for a non-aqueous electrolyte secondary battery of this embodiment will be described. figure 2 It is a longitudinal cross-sectional view of main parts of the negative electrode for a nonaqueous electrolyte secondary battery of the present embodiment.

[0105] Such as figure 2 As shown, the negative electrode 10 is composed of a negative electrode current collector 11 having a convex portion 12 on one side and columnar particles 15 formed on the convex portion 12 . The columnar particles are composed of a stack of eight particle layers 151 , 152 , 153 , 154 , 155 , 156 , 157 , and 158 .

[0106] Counting from the bottom of the columnar particles 15, the particle layers 151, 153, 155, and 157 of the odd-numbered layers (1st, 3rd, 5th, and 7th layers) are inclined toward the first direction P with respect to the normal direction of the current collector. Counting from the bottom of the columnar particles 15, the particle layers 152...

Embodiment approach 2

[0137] use Figure 14 The negative electrode for a non-aqueous electrolyte secondary battery of this embodiment will be described. Figure 14 It is a longitudinal sectional view of main parts of the negative electrode of the present embodiment.

[0138] Such as Figure 14 As shown, the negative electrode 100 has a negative electrode current collector 111 and a negative electrode active material layer 115 covering the surface of the negative electrode current collector 111 . The negative electrode active material is preferably SiOx (02 / g~8m 2 / g. More preferably, the BET specific surface area of ​​the negative electrode active material layer 115 is 5.5m 2 / g~7.5m 2 / g. In addition, the negative electrode active material layer 115 in the charged state preferably has a BET specific surface area of ​​0.1 m 2 / g~1.7m 2 / g.

[0139] The negative electrode 100 can be obtained, for example, by forming a negative electrode active material layer with a smooth surface on the ne...

Embodiment approach 3

[0145] use Figure 15 The negative electrode for a non-aqueous electrolyte secondary battery of this embodiment will be described. Figure 15 It is a longitudinal sectional view of main parts of the negative electrode of the present embodiment.

[0146] Such as Figure 15 As shown, the negative electrode 200 has columnar particles 215 formed obliquely with respect to the normal direction of the current collector 211 on the convex portion 212 on the surface of the current collector 211 . The columnar particles 215 have a plurality of discrete protrusions 216 on the surface on the side forming an obtuse angle with the surface direction of the current collector 211 . A plurality of protrusions 216 are dispersed on the surface of the current collector without overlapping each other. More specifically, the plurality of protrusions 216 are discretely formed at an angle θ that forms an obtuse angle with the surface direction (A-A direction) of the current collector 11 in the growt...

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Abstract

Disclosed is an electrode for electrochemical devices, which comprises a collector and an active material layer formed on the collector. The active material layer contains an active material which iscapable of reversibly absorbing / desorbing lithium ions and has a theoretical capacity of more than 833 mAh / cm3. The active material layer has a BET specific surface area of not less than 5 m2 / g but not more than 80 m2 / g.

Description

technical field [0001] The present invention relates to an electrochemical element, and more specifically, to improvement of an active material in an electrode for an electrochemical element. Background technique [0002] In recent years, demand for lithium-ion secondary batteries is increasing as a power source for driving portable electronic devices such as mobile phones, digital cameras, video cameras, and notebook computers, and mobile communication devices. Nonaqueous electrolyte secondary batteries typified by lithium ion secondary batteries are lightweight even among electrochemical elements, and have high electromotive force and high energy density. [0003] In a lithium ion secondary battery, for example, lithium-containing composite oxide is used as a positive electrode active material, and lithium metal or lithium alloy is used as a negative electrode active material. In addition, as the negative electrode, for example, a negative electrode in which a negative el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/02H01G9/058H01M4/48H01M4/70H01G11/06H01G11/22H01G11/46H01M4/13H01M4/139H01M4/36
CPCH01M4/70Y02E60/122Y02E60/13H01G11/26H01M4/13H01G11/28H01M10/052H01M2004/021H01G9/016H01M4/134H01G11/50H01G9/058H01G11/70H01G11/22H01G11/74Y02E60/10H01M4/02H01M10/05
Inventor 藤川万乡武泽秀治中井美有纪
Owner PANASONIC CORP
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