Battery

• US 20060134524A1
• Filed: 12/21/2005
• Published: 06/22/2006
• Est. Priority Date: 12/22/2004
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Nakai, Hideki, Kubota, Tadahiko, Kawashima, Atsumichi, Kita, Akinori
• Granted Patent: US 7,674,552 B2
• Time in Patent Office: Days
• US Class Current: 429/231.950
• CPC Class Codes: H01M 10/052 Li-accumulators
• CPC Class Codes: H01M 10/0587 of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators
• CPC Class Codes: H01M 10/4235 Safety or regulating additives or arrangements in electrodes, separators or electrolyte H01M10/4242 takes precedence
• CPC Class Codes: H01M 4/131 Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx
• CPC Class Codes: H01M 4/134 Electrodes based on metals, Si or alloys
• CPC Class Codes: H01M 4/366 as layered products
• CPC Class Codes: H01M 4/38 of elements or alloys
• CPC Class Codes: H01M 4/386 Silicon or alloys based on silicon
• CPC Class Codes: H01M 4/387 Tin or alloys based on tin
• CPC Class Codes: H01M 4/525 of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A battery capable of improving battery characteristics such as cycle characteristics is provided. A coating containing lithium fluoride and lithium hydroxide is provided on the surface of an anode active material layer. The ratio between lithium fluoride and lithium hydroxide is in the range, in which the Li₂F⁺/Li₂OH⁺ peak intensity ratio obtained in positive ion analysis by a Time of Flight-Secondary Ion Mass Spectrometry is 1 or more. The anode active material layer contains a substance containing Si or Sn as an element as an anode active material. By the coating, oxidation of the anode active material layer is inhibited, and decomposition reaction of the electrolytic solution is inhibited.

Claims

1. A battery comprising:

a cathode;

an anode; and

an electrolyte,

wherein the anode has a coating in which a peak intensity ratio of Li₂F⁺ to Li₂OH⁺ (Li₂F⁺/Li₂OH⁺) obtained in positive ion analysis by a Time of Flight-Secondary Ion Mass Spectrometry is 1 or more.

2. The battery according to claim 1, wherein the anode has an anode active material layer which is capable of inserting and extracting lithium and contains at least one of metal elements and metalloid elements.

3. The battery according to claim 1, wherein the anode has an anode active material layer containing at least one of silicon and tin.

4. The battery according to claim 1, wherein the cathode contains a lithium-containing complex oxide.