Negative electrode for electric device and electric device using the same

A negative electrode for an electric device, comprising a current collector and an electrode layer containing a negative electrode active material, an electrically-conductive auxiliary agent and a binder and formed on a surface of the current collector,

• wherein the negative electrode active material contains an alloy represented by the following formula (1):
• SixSnyMzAa (1)
• in the formula (1), M is Al,
• A is an inevitable impurity, and
• x, y, z and a represent mass percent values and satisfy conditions of 31≦x≦50, 0<y≦45, 0<z≦43, 0≦a<0.5, and x+y+z+a=100, and
• the binder contains a resin having an E elastic modulus of greater than 1.00 GPa and less than 7.40 GPa.

A negative electrode for an electric device, comprising a current collector and an electrode layer containing a negative electrode active material, an electrically-conductive auxiliary agent and a binder and formed on a surface of the current collector,

• wherein the negative electrode active material contains an alloy represented by the following formula (1):
• SixSnyMzAa (1)
• in the formula (1), M is V,
• A is an inevitable impurity, and
• x, y, z and a represent mass percent values and satisfy conditions of 27≦x<100, 0<y≦73, 0<z≦73, 0≦a<0.5, and x+y+z+a=100, and
• the binder contains a resin having an E elastic modulus of greater than 1.00 GPa and less than 7.40 GPa.

A negative electrode for an electric device, comprising a current collector and an electrode layer containing a negative electrode active material, an electrically-conductive auxiliary agent and a binder and formed on a surface of the current collector,

• wherein the negative electrode active material contains an alloy represented by the following formula (1):
• SixSnyMzAa (1)
• in the formula (1), M is C,
• A is an inevitable impurity, and
• x, y, z and a represent mass percent values and satisfy conditions of 29≦x<100, 0<y<100, 0<z<100, 0≦a<0.5, and x+y+z+a=100, and
• the binder contains a resin having an E elastic modulus of greater than 1.00 GPa and less than 7.40 GPa.