Binder for batteries, and electrode compositions and batteries incorporating same
AssigneeDaikin Industries, Ltd.
InventorsTetsuo Shimizu, Yoshihide Higashihata, Takayuki Nakamura
Life of this patent
Estimating the term…
Abstract
A binder for use in batteries which is in the form of an aqueous or nonaqueous dispersion or a powder comprising core-shell composite fine particles 0.05 to 1 .mu.m in mean particle size and each having a core of a fibrillating polytetrafluoroethylene and a shell of a nonfibrillating polymer, the composite fine particles having a core-to-shell ratio by weight of 98:2 to 50:50, and electrode compositions and batteries incorporating the binder.
Claims15
A composition for an electrode comprising 0.1 to 10 wt. % of core-shell composite fine particles and, as the balance, a powdery electrode material, the composite fine particles being 0.5 to 1 .mu.m in mean particle size, each comprising a core of a fibrillating polytetrafluoroethylene and a shell of a nonfibrillating polymer, and having a core-to-shell ratio by weight of 98:2 to 50:50.
A nonaqueous electrolyte secondary battery comprising a positive electrode, said positive electrode comprising a lithium compound as an active material, an electrically conductive agent and a binder;
- a negative electrode and a nonaqueous electrolyte, wherein the binder comprises core-shell composite fine particles 0.05 to 1 .mu.m in mean particle size and each having a core of a fibrillating polytetrafluoroethylene and a shell of a nonfibrillating polymer, the composite fine particles having a core-to-shell ratio by weight of 98:2 to 50:50.
Dependencies are inferred from the claim text.