NEGATIVE ELECTRODE FOR SECONDARY CELL, NEGATIVE PLATE FOR SECONDARY CELL, AND SECONDARY CELL COMPRISING THE SAME

摘要

The use of a conventional rubber polymer as a binder for a negative electrode of rechargeable batteries using non-aqueous electrolytic solution has unsatisfactory low-temperature discharge characteristics, and weak peel strength in a negative electrode plate. A binder made of a mixture of Binder (A) selected from styrene butadiene copolymer containing styrene at between 20% and 70%, and Binder (B) selected at least one from styrene butadiene copolymer containing styrene at between 80% and 100% and polystyrene is used for the negative electrode of rechargeable batteries comprising a carbon material and the binder. The use of the negative electrode comprising the carbon material and binder enables to achieve good resistance to peeling of a coated film, and thus ease of handling of a negative electrode plate. Consequently, rechargeable batteries with good low-temperature discharge characteristics are supplied at good yield.