Battery and method of manufacturing the same
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United States of America Patent
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Apr 20, 2010
Grant Date -
Sep 6, 2007
app pub date -
Nov 18, 2005
filing date -
Nov 25, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A battery capable of improving cycle characteristics is provided. An anode active material layer is formed by a vapor phase method, and includes Si as an element. In the anode active material layer, a plurality of primary particles formed by growth in a thickness direction are included, and the plurality of primary particles are agglomerated to form a plurality of secondary particles. Each secondary particle is separated by a groove formed by charge and discharge, and some of primary particles are split particles split by the groove. The average number of the split particles per secondary particle in 5 or more adjacent secondary particles is 10 or more. Moreover, the primary particles and the secondary particles are inclined to the same side.
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