ENERGY STORAGE DEVICE
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United States of America Patent
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Issued Date -
Dec 3, 2015
app pub date -
May 27, 2015
filing date -
May 28, 2014
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Abstract
An energy storage device comprising: a positive electrode, a negative electrode, a separator disposed between the positive electrode and the negative electrode, a nonaqueous electrolyte, and an insulating layer disposed between the positive electrode and the separator, wherein the positive electrode contains a compound represented by LiaNibCocMdWxNbyZrzO2 (provided that a, b, c, d, x, y and z satisfy the equations of 0≦a≦1.2, 0≦b≦1, 0.1≦c≦0.4, 0≦d≦0.5, 0≦x≦0.1, 0≦y≦0.1, 0≦z≦0.1 and b+c+d=1, and M denotes at least one kind of element selected from the group consisting of Mn, Ti, Cr, Fe, Co, Cu, Zn, Al, Ge, Sn and Mg) as a positive active material and the negative electrode contains hardly graphitizable carbon with a D50 particle diameter greater than or equal to 1.0 μm and less than or equal to 6.0 μm as a negative active material.
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