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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, and achieve the effect of improving battery characteristics, good effect, and inhibiting expansion and contraction

Inactive Publication Date: 2006-04-26
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 symbols used in the above embodiments are used as they are.

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

[0064] manufacture image 3 and 4 secondary battery shown. First, an anode active material layer 12 containing silicon was formed by a sputtering method using a silicon target on an anode current collector 11 made of copper foil. Then, as a discharge gas, a mixed gas of argon and oxygen is used at the beginning of 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 ratio of the oxygen flow rate during the initial deposition period was changed in Examples 1-1 to 1-6.

[0065] In addition, lithium cobaltate (LiCoO) with an average particle size of 5 μm as the c...

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Abstract

The present invention provides a battery capable of improving cycle characteristics. The anode active material layer forms an alloy with the anode current collector at least at a 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 wherein the anode active material layer is divided into two in the thickness direction, the average oxygen content on the collector side is A and the average oxygen content on the surface side is B, the average oxygen content A on the collector side is greater than The average oxygen content B of the surface side, and the difference AB therebetween is 4 atom % to 30 atom %.

Description

[0001] The present invention contains subject matter related to Japanese Patent Application JP2004-303376 filed in the Japan Patent Office on Oct. 18, 2004, the entire content of which is hereby incorporated. 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, high-capacity secondary batteries, which are power sources for mobile devices, are urgently required in connection with the high performance and multifunctionality of mobile devices. A lithium secondary battery is a secondary battery that satisfies this requirement. However, in a general mode currently used for lithium secondary batteries, lithium cobalt oxide is used for the cathode and graphite is used for the anode, the battery capacity is in a saturated state, and it is extremely difficult to obtain a high-capacity battery. Therefore, meta...

Claims

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Application Information

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IPC IPC(8): H01M4/02H01M4/13H01M4/134H01M4/139H01M4/48H01M10/05
CPCH01M4/131H01M4/134H01M4/1391H01M4/485H01M4/525H01M4/661H01M10/052H01M10/0587H01M2004/021H01M4/386Y02E60/10H01M4/02H01M10/05
Inventor 小西池勇川瀬贤一佐鸟浩太郎
Owner MURATA MFG CO LTD
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