Title:
リチウム二次電池用ファイバー正極の製造方法、リチウム二次電池用ファイバー負極及びその製造方法、並びにファイバー電極を備えたリチウム二次電池
Document Type and Number:
Japanese Patent JP5283138
Kind Code:
B2
Abstract:
Provided is a method for mass manufacturing, at low cost, of a fiber positive electrode for a lithium secondary battery, which has excellent charge/discharge cycle characteristics, and which is capable of charging/discharging with high current density, and a main active material of which is a lithium-doped transition metal oxide. The method includes the steps of: (a) forming a tubular coating of either a transition metal oxide or a transition metal hydroxide on a carbon fiber current collector; and (b) performing, in a lithium ion containing solution in a sealed system under presence of an oxidant or a reductant, heat treatment at 100 to 250 °C on the carbon fiber current collector, on which the tubular coating of either the transition metal oxide or the transition metal hydroxide is formed, to obtain a coating of a lithium-doped transition metal oxide on the carbon fiber current collector. Further provided are: a fiber negative electrode for a lithium secondary battery, which has high current density, high energy density, and excellent charge/discharge cycle characteristics, and which can be fabricated in a relatively easy manner; and a method for fabricating the fiber negative electrode. The fiber negative electrode for a lithium secondary battery includes: (c) a carbon fiber current collector; (d) an outer layer which is a tubular composite layer of a Sn oxide and M x O y formed on the carbon fiber current collector; and (e) an intermediate layer formed of a Sn alloy, which has a lithium occlusion capacity and which is present at an interface between the carbon fiber current collector and the outer layer. The method for fabricating the fiber negative electrode for a lithium secondary battery includes: forming a coating of one of Sn and a Sn alloy, and a coating of at least one kind of metal selected from the group consisting of Fe, Mo, Co, Ni, Cr, Cu, In, Sb, and Bi, on a carbon fiber current collector by an electroplating method; and then performing heat treatment on the carbon fiber current collector under a trace oxygen atmosphere at 350 to 650 °C. Moreover, the lithium secondary battery includes: the fiber positive electrode and the fiber negative electrode fabricated in the above methods; and an electrolyte.
Inventors:
Tetsuo Sakai
Yakin
Takashi Mukai
High Saki Tomoaki
Tsutsumi Kazuo
Kazuya Nishimura
Yakin
Takashi Mukai
High Saki Tomoaki
Tsutsumi Kazuo
Kazuya Nishimura
Application Number:
JP2010549389A
Publication Date:
September 04, 2013
Filing Date:
February 02, 2010
Export Citation:
Assignee:
National Institute of Advanced Industrial Science and Technology
Kawasaki Heavy Industries, Ltd.
Kawasaki Heavy Industries, Ltd.
International Classes:
H01M4/1391; C23C8/10; C25D7/00; C25D9/08; C25D15/00; H01M4/13; H01M4/131; H01M4/134; H01M4/139; H01M4/1395; H01M4/38; H01M4/48; H01M4/485; H01M4/50; H01M4/505; H01M4/52; H01M4/525; H01M4/62; H01M4/66; H01M4/75; H01M10/052; H01M10/058
Domestic Patent References:
| JPS53104826A | 1978-09-12 | |||
| JP2007042603A | 2007-02-15 | |||
| JP2003317794A | 2003-11-07 | |||
| JP2000340227A | 2000-12-08 | |||
| JPS53104826A | 1978-09-12 | |||
| JP2007042603A | 2007-02-15 |
Attorney, Agent or Firm:
Patent business corporation Yuko patent office