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Negative electrode for secondary battery
| Details |
Inventors: Ohsawa, Toshiyuki; Kabata, Toshiyuki; Kimura, Okitoshi; Yoneyama, Sachiko;
Assignee: Ricoh Company, Ltd. (Tokyo, JP)
Primary Examiner: McFarlane; Anthony
Assistant Examiner: Everhart; C.
Attorney, Agent or Firm: Cooper & Dunham
A negative electrode for a secondary battery which has a positive electrode including a polymer active material. The negative electrode includes: a current collector beforehand roughened at one surface thereof; a first layer disposed on the roughened one surface and including a material selected from the group consisting of alkali metal and an alloy containing alkali metal; and a second layer disposed on the first layer and including an ion conductive material. A surface of the first layer has an uneven configuration which conforms with another uneven configuration of the roughened one surface of the current collector, the surface of the first layer being in contact with the second layer. A method for manufacturing the negative electrode is also disclosed. |
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DETAILED DESCRIPTION The present invention was made considering the above-mentioned problems of the state of art.
It is therefore an object of the present invention to provide a negative electrode which exhibits a highly enhanced output and guarantees a long-life of a secondary battery in the case where the negative electrode is incorporated into the secondary battery.
The object of the present invention can be achieved by a negative electrode for a secondary battery having a positive electrode comprising a polymer active material, the negative electrode comprising: a current collector beforehand roughened at one surface thereof; a first layer disposed on the roughened one surface and comprising a material selected from the group consisting of alkali metal and an alloy containing alkali metal; and a second layer disposed on the first layer and comprising an ion conductive material, a surface of the first layer having an uneven configuration which conforms with another uneven configuration of the roughened one surface of the current collector, the surface of the first layer being in contact with the second layer, and a method of manufacturing a negative electrode for a secondary battery having positive electrode comprising a polymer active material, the method comprising the steps of: preparing a current collector beforehand roughened at one surface thereof; covering the roughened one surface with an ion conductive material; and depositing electrochemically a metallic layer between the ion conductive material film and the roughened one surface in such a manner that a surface of the deposited metallic layer has an uneven configuration conforming with another uneven configuration of the roughened one surface, the surface of the deposited surface being in contact with the ion conductive material film, the metallic layer comprising a metal selected from the group consisting of alkali metal and an alloy containing alkali metal.
According to the present invention, a surface of the first layer being in contact with the second layer has an uneven configuration which conforms with another uneven configuration of the roughened one surface of the current collector, and consequently the negative electrode possesses an enlarged reaction surface which makes it possible to provide an enhanced output for the secondary battery in which the negative electrode is incorporated
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Optical Systems 
