Lithium secondary battery and method of manufacturing same
AssigneeToyota Jidosha Kabushiki Kaisha
InventorsHideki Nakayawa, Hideyuki Yamamura
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Abstract
A lithium secondary battery 100 provided by this invention has electrodes 30 and 40 configured in a structure in which active material layers 34 and 44, including active materials and binders, are held by collectors 32 and 42. The active material of at least one of the positive electrode 30 and the negative electrode 40 of the electrodes is formed from a metal compound which stores and releases lithium ions through conversion reactions. The lithium secondary battery 100 includes a polyimide-base resin as a binder.
Claims16
A lithium secondary battery having electrodes configured in a structure in which an active material layer, including an active material and a binder, is held by collectors, wherein
- an active material of at least one of a positive electrode and a negative electrode among the electrodes has a metal compound which stores and releases lithium ions through conversion reactions;
- and
- the binder includes a polyimide-base resin.
A method of manufacturing a lithium secondary battery having electrodes configured in a structure in which an active material layer, including an active material and a binder, is held by collectors,
- the method comprising the steps of:
- preparing an active material layer formation composition in paste form, including a metal compound forming the active material and the binder;
- applying the active material layer formation composition to a surface of the collectors and forming an active material layer;
- heat-treating the collectors on which is formed the active material layer;
- and
- using the electrodes including the active material layer and collectors after heat treatment to assemble a lithium secondary battery, wherein
- as a metal compound forming the active material, a metal compound is used which stores and releases lithium ions through conversion reactions including a reaction of reducing the metal compound to produce a simple metal and a lithium compound, and a reverse reaction in which the simple metal is oxidized to produce the metal compound and a lithium ion;
- and
- as the binder, a polyimide-base resin, or a precursor which becomes the polyimide-base resin through the heat treatment, is used.
Dependencies are inferred from the claim text.