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Anode and secondary battery

a secondary battery and anode technology, applied in the field of secondary batteries, can solve the problems of easy decline of cycle characteristics and noticeably prone to decline of cycle characteristics, and achieve the effects of increasing performance, improving service life and small siz

Inactive Publication Date: 2008-12-11
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]As recent portable electronic devices have a smaller size, higher performance and more functions, secondary batteries tend to be frequently charged and discharged accordingly, thereby cycle characteristics easily decline. In particular, in a lithium-ion secondary battery using silicon as an anode active material to increase the capacity, cycle characteristics are noticeably prone to decline due to the above-described increase in surface area. Therefore, further improvement in cycle characteristics of the secondary battery is desired.
[0012]In view of the foregoing, it is desirable to provide an anode and a secondary battery which are capable of improving cycle characteristics.

Problems solved by technology

As recent portable electronic devices have a smaller size, higher performance and more functions, secondary batteries tend to be frequently charged and discharged accordingly, thereby cycle characteristics easily decline.
In particular, in a lithium-ion secondary battery using silicon as an anode active material to increase the capacity, cycle characteristics are noticeably prone to decline due to the above-described increase in surface area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1-1

[0137]A laminate film type secondary battery shown in FIGS. 9 and 10 was manufactured by the following steps. At that time, the laminate film type secondary battery was a lithium-ion secondary battery in which the capacity of the anode 54 is represented based on insertion and extraction of lithium.

[0138]At first, the cathode 53 was formed. After lithium carbonate (Li2CO3) and cobalt carbonate (CoCO3) were mixed at a molar ratio of 0.5:1, the mixture was fired in air at 900° C. for 5 hours to obtain a lithium-cobalt complex oxide (LiCoO2). Next, after 91 parts by weight of the lithium-cobalt complex oxide as a cathode active material, 6 parts by weight of graphite as an electrical conductor and 3 parts by weight of polyvinylidene fluoride as a binder were mixed to form a cathode mixture, the cathode mixture was dispersed in N-methyl-2-pyrrolidone to form paste-form cathode mixture slurry. Finally, after the cathode mixture slurry was uniformly applied to both sides of the cathode cur...

examples 1-2 to 1-14

[0143]Secondary batteries were formed by the same steps as those in Example 1-1, except that instead of 0.2 cm3 / g, the volumetric capacity of the small pore group per unit weight of silicon was 0.1 cm3 / g (Example 1-2), 0.09 cm3 / g (Example 1-3), 0.08 cm3 / g (Example 1-4), 0.07 cm3 / g (Example 1-5), 0.06 cm3 / g (Example 1-6), 0.05 cm3 / g (Example 1-7), 0.04 cm3 / g (Example 1-8), 0.03 cm3 / g (Example 1-9), 0.02 cm3 / g (Example 1-10), 0.01 cm3 / g (Example 1-11), 0.005 cm3 / g (Example 1-12), 0.001 cm3 / g (Example 1-13), or 0 cm3 / g (Example 1-14).

examples 2-1 to 2-9

[0150]Secondary batteries were formed by the same steps as those in Examples 1-1, 1-2, 1-4, 1-7 and 1-10 to 1-14, except that while the anode current collector 54A was moved back and forth relatively to an evaporation source, silicon was deposited six times to be laminated, thereby the anode active material had a six-layer configuration. At that time, the deposition rate was 100 nm / s.

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PUM

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Abstract

A battery capable of improving cycle characteristics is provided. An anode includes: an anode current collector, and an anode active material layer arranged on the anode current collector, in which the anode active material layer includes an anode active material including silicon (Si), and including a pore group with a diameter ranging from 3 nm to 50 nm both inclusive, and the volumetric capacity per unit weight of silicon of the pore group with a diameter ranging from 3 nm to 50 nm both inclusive is 0.2 cm3 / g or less, the volumetric capacity being measured by mercury porosimetry using a mercury porosimeter.

Description

CROSS REFERENCES TO RELATED APPLICATIONS[0001]The present invention contains subject matter related to Japanese Patent Application JP 2007-149253 filed in the Japanese Patent Office on Jun. 5, 2007 and Japanese Patent Application JP 2008-015253 filed in the Japanese Patent Office on Jan. 25, 2008, the entire contents of which being incorporated herein by references.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an anode including an anode current collector and an anode active material layer arranged on the anode current collector, and a secondary battery including the anode.[0004]2. Description of the Related Art[0005]In recent years, portable electronic devices such as camera-integrated VTRs (videotape recorders), cellular phones, or laptop computers are widely used, and size and weight reduction in the portable electronic devices and an increase in longevity of the portable electronic devices have been strongly demanded. Accordingl...

Claims

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Application Information

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IPC IPC(8): H01M4/42H01M4/58H01M4/52H01M4/02H01M4/04H01M4/134H01M4/1395H01M4/48H01M10/0525H01M10/0568H01M10/0569H01M10/36H01M50/119H01M50/121H01M50/129H01M50/133
CPCH01M2/0257H01M4/0404H01M4/045H01M4/049H01M4/134H01M4/1395H01M4/362H01M4/483H01M6/164H01M10/0525H01M10/0568H01M10/0569H01M2004/021H01M2004/027H01M2300/0034Y02E60/122H01M4/38H01M4/386Y02E60/10H01M50/133H01M50/121H01M50/129H01M50/119H01M50/103H01M50/107H01M4/366H01M2220/30
Inventor HIROSE, TAKAKAZUKAWASE, KENICHIKONISHIIKE, ISAMUKURASAWA, SHUNSUKEIWAMA, MASAYUKIMATSUMOTO, KOICHI
Owner SONY CORP
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