Layer structure oxide
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United States of America Patent
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Apr 2, 1996
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N/A
app pub date -
Jul 12, 1994
filing date -
Mar 7, 1994
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Abstract
In a layer structure oxide in crystallite form having a composition of the formula: AMO.sub.2 wherein A is Li or Na and M is Co, Ni, Fe or Cr, at least one additive element Z which is Bi, Pb or B is present in the form of an oxide on the surface of crystallites or between crystallites. Atomic ratio Z/M is from 0.0001 to 0.1. Since the crystallites have an increased size, the layer structure oxide has improved properties and is suitable for use as a positive electrode material of a secondary cell.
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