Panasonic Corporation

Matsushita Electric Industrial Co., Ltd.

Takayuki Nakamoto

Harunari Shimamura

Yasuhiko Bito

Toshitada Sato

Yoshiaki Nitta

Kazuyoshi Honda

Kazuhiro Okamura

Kiichiro Oishi

Takafumi Fujiwara

A negative electrode material for non-aqueous electrolyte secondary batteries, characterized in that the negative electrode material comprises a composite particle including solid phases A and B, the solid phase A being dispersed in the solid phase B, and the ratio (I/I) of the maximum diffracted X-ray intensity (I) attributed to the solid phase A to the maximum diffracted X-ray intensity (I) attributed to the solid phase B satisfies 0.001&#x2266;I/I&#x2266;0.1, in terms of a diffraction line obtained by a wide-angle X-ray diffraction measurement of the composite particle.

Cathode material and non-aqueous electrolyte secondary battery using it

A negative active material thin film provided on a collector layer directly or via an underlying layer has a multi-layered configuration including at least two silicon thin films containing silicon as a main component. Because of this, even when the thickness of the negative active material thin film is increased, the increase in thickness of one silicon thin film can be prevented by increasing the number of silicon thin films. Thus, the diameter of silicon particles substantially in an inverse truncated cone shape is not enlarged in the silicon thin film. Accordingly, in an energy device having a thin film mainly containing silicon as a negative active material, even when the thickness of the negative active material layer is increased to obtain a larger capacity, cycle characteristics are not degraded.

Energy device and method for producing the same

A method for producing a negative electrode material for a non-aqueous electrolyte secondary battery is disclosed: which includes a step of applying a shearing force to an intermetallic compound under the presence of nitrogen. The intermetallic compound contains element(A) which reacts with nitrogen and forms a nitride, but does not react with lithium, and element(B) which does not react with nitrogen, but reacts with lithium, thereby forming a mixture containing a nitride of element(A) and a substance of element(B).

Negative electrode material for non-aqueous electrolyte secondary battery and method for producing the same

In cycles of charging and discharging, an excellent capacity maintenance rate is obtained. The charging and discharging cycle characteristic of battery is enhanced. Further, an excellent initial discharging capacity is obtained. A negative electrode, a positive electrode, and a non-aqueous electrolyte are contained. The negative electrode includes an alloy of Si, a first element and a second element. The first element includes at least one element selected from the group consisting of the second group element except Mg in the periodic table, transition elements, twelfth group element, thirteenth group element except B, and fourteenth group element except Si. The second element includes at least one element of B and Mg.

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Sakai, Japan

Takayuki Nakamoto