Honda Motor Co., Ltd.

Kenshi Inoue

Takashi Nakagawa

Toshio Tokune

Kiyoshi Tanaami

Takuya Nishinuma

Takahiro Komori

Provided is an electrode mixture layer capable of reducing internal resistance by use of a carbon nanotube molding. The electrode mixture layer includes an active material and a conductor of carbon nanotubes in close contact with the surface of the active material, and the number density of the carbon nanotubes is 4 tubes/&#x3bc;m or more. The number density is defined as a value obtained by providing measurement lines on a scanning electron microscope image of a surface of the electrode mixture layer at 0.3 &#x3bc;m intervals both longitudinally and laterally, measuring the total number of the carbon nanotubes being in close contact with the surface of the active material and intersecting the measurement lines, and dividing the total number of the carbon nanotubes by the total length of the measurement lines on the active material surface.

Electrode mixture layer

A negative electrode active material for a secondary battery contains an aluminum alloy. The internal structure of the aluminum alloy has a crystalline aluminum phase in a magnesium-supersaturated solid solution state, and an amorphous aluminum phase. The amorphous aluminum phase is dispersed in the crystalline aluminum phase in the magnesium-supersaturated solid solution state. Each of these phases has a columnar shape. The magnesium content of the aluminum alloy preferably is greater than 22 at % and less than 35 at %, and more preferably, lies within a range of 25&#xb1;2 at %.

Growing community of inventors

Saitama, Japan

Kenshi Inoue