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Battery

A battery and electrolyte technology, applied in the direction of battery electrodes, lithium batteries, secondary batteries, etc., can solve problems such as difficult to obtain characteristics, achieve the effect of improving battery characteristics, inhibiting expansion and contraction, and good results

Inactive Publication Date: 2007-10-31
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, even in an anode in which the anode current collector and the anode active material layer are combined, since the active material expands and contracts to separate the anode current collector and the anode active material layer, it is difficult to obtain sufficient characteristics

Method used

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[0062] In addition, specific examples of the present invention will be described in detail with reference to the accompanying drawings. In the following examples, the corresponding reference numerals and signs used in the above embodiments are used as they are.

[0063] (Examples 1-1 to 1-6)

[0064] The secondary battery shown in Figs. 3 and 4 was manufactured. First, on the anode current collector 11 made of copper foil, the anode active material layer 12 containing silicon is formed by a sputtering method using a silicon target. Then, for the discharge gas, a mixed gas of argon and oxygen is used at the beginning of the deposition up to half the thickness of the anode active material layer 12, and then argon is used. The flow rate of the discharge gas is kept constant at 50cm 3 / min, and the oxygen flow rate ratio during the initial deposition period was changed in Examples 1-1 to 1-6.

[0065] In addition, lithium cobalt oxide (LiCoO 2 ) Powder, carbon black as a conductive ma...

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Abstract

The present invention provides a battery capable of improving cycle characteristics. An anode active material layer is alloyed with an anode current collector at least in part of the interface with the anode current collector. The average oxygen content in the anode active material layer is 40 atom % or less. When the average oxygen content on the current collector side is A and the average oxygen content on the surface side is B where the anode active material layer is divided into two in the thickness direction, the average oxygen content on the current collector side A is larger than the average oxygen content on the surface side B, and the difference therebetween, A-B is from 4 atom % to 30 atom %.

Description

[0001] The present invention includes subject matter related to Japanese Patent Application JP2004-303376 filed at the Japanese Patent Office on October 18, 2004, the entire contents of which are incorporated herein. Technical field [0002] The present invention relates to an anode in which an anode current collector is provided with an anode active material layer, and a battery using the anode. Background technique [0003] In recent years, in connection with the high performance and multifunctionality of mobile devices, there is an urgent need for high-capacity secondary batteries, which are power sources for mobile devices. Lithium secondary batteries are secondary batteries that meet this requirement. However, in a common mode currently used for lithium secondary batteries, using lithium cobaltate for the cathode and graphite for the anode, the battery capacity is in a saturated state, and it is extremely difficult to obtain a high-capacity battery. Therefore, metal lithium (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/02H01M10/40H01M4/13H01M4/134H01M4/139H01M4/48H01M10/05
CPCH01M10/0587H01M4/525H01M4/1391H01M4/661H01M4/485H01M2004/021H01M10/052H01M4/134H01M4/38Y02E60/122H01M4/131H01M4/386Y02E60/10H01M4/02H01M10/05
Inventor 小西池勇川瀬贤一佐鸟浩太郎
Owner MURATA MFG CO LTD