| 摘要 |
PROBLEM TO BE SOLVED: To improve the discharge capacity and a cycle characteristic by providing a negative electrode including a graphitized mesophase corpuscle as a negative electrode material and a cellulose ether material and a synthetic rubber latex adhesive as binders, and a positive electrode including a lithium-containing metal oxide as a positive electrode active material. SOLUTION: A cellulose ether material and a synthetic rubber latex adhesive are set to 0.5-1 wt.% and to 0.5-2 wt.% to 100 wt.% of the whole negative electrode constituting material. A graphitized mesophase corpuscle, which stores a lithium ion within the crystal lattice, preferably has a spacing of lattice plan (002) of 3.45 Å or less and a size of C-axial crystal element of 300 Åor more. As the cellulose ether material, a one having an etherification degree of 0.5-2.5, an average polymerization degree of 100-200, and an average molecular weight of 25,000-400,000, for example, carboxymethyl cellulose sodium is preferably used. As the synthetic rubber latex adhesive, carboxyl-denatured styrene butadiene rubber latex is preferable. |
