NEGATIVE ELECTRODE PLATE FOR NONAQUEOUS ELECTROLYTE SECONDARY BATTERY AND NONAQUEOUS ELECTROLYTE SECONDARY BATTERY
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United States of America Patent
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Issued Date -
Mar 23, 2017
app pub date -
Mar 18, 2015
filing date -
Mar 25, 2014
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Abstract
A negative electrode plate for nonaqueous electrolyte secondary batteries according to an embodiment of the present invention includes a negative electrode mix layer, placed on a negative electrode core, containing a negative electrode active material capable of storing and releasing lithium ions. The negative electrode core is copper foil having a thickness of 5.9 μm to 8.1 μm and a surface roughness Rz of 0.8 μm to 1.5 μm. The negative electrode mix layer contains the negative electrode active material, a binding agent, and a carboxymethylcellulose-ammonium salt. The negative electrode active material is composed of a mixture of a graphite material and a silicon oxide represented by SiOx (0.5≦x<1.6). The content of the silicon oxide in the negative electrode active material is 0.5% to 20% by mass.
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