Title:
リチウムイオン二次電池
Document Type and Number:
Japanese Patent JP4053763
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a lithium ion secondary battery wherein all of a low- temperature characteristic, a cycle characteristic and a high rate discharge characteristic are remarkably improved as compared with a conventional one. SOLUTION: This lithium ion secondary battery includes at least a positive electrode plate, a negative electrode plate and an electrolyte. The secondary battery is characterized by that (A) the positive electrode plate is composed by forming, on a collector, a coat layer containing (1) an active material formed of a Li-Co based composite oxide, (2) a granular conductive material wherein the sum quantity of a large-diameter constituent having a particle diameter of 4-8 μm and a small-diameter constituent having a particle diameter of 0.1 μm or less is 70 wt.% or more in its total quantity and the weight ratio of the large-diameter constituent to the small-diameter constituent is 1:0.01 to 1: 1, and polyvinylidene fluoride having a melting point of 165 deg.C or below, (4) the void content of the coat layer is set in the range of 0.08-0.14 CC/g and (B) the viscosity of the electrolyte is 3 cPs or less.
Inventors:
Toshihiro Kitchen
Seiji Okada
Kenichi Kizu
Ken Moriuchi
Seiji Okada
Kenichi Kizu
Ken Moriuchi
Application Number:
JP2001356217A
Publication Date:
February 27, 2008
Filing Date:
November 21, 2001
Export Citation:
Assignee:
Mitsubishi Cable Industries, Ltd.
International Classes:
H01M10/05; H01M4/131; H01M4/525; H01M4/62; H01M10/0525; H01M10/0566
Domestic Patent References:
| JP9245769A | ||||
| JP9219190A | ||||
| JP2001143760A |
Attorney, Agent or Firm:
Takashima Ichi