Electrode, power storage device, electronic device, and manufacturing method of electrode

Embodiment 1

[0073]In this embodiment, an electrode of one embodiment of the present invention is described with reference to FIGS. 1A to 1D.

[0074]In this embodiment, an example in which an electrode of one embodiment of the present invention is applied to a lithium ion secondary battery is described; however, the use of an electrode of one embodiment of the present invention is not limited to this. An electrode of one embodiment of the present invention can be applied to any of a battery, a primary battery, a secondary battery, a lithium air battery, a lead storage battery, a lithium ion polymer secondary battery, a nickel-hydrogen storage battery, a nickel-cadmium storage battery, a nickel-iron storage battery, a nickel-zinc storage battery, a silver oxide-zinc storage battery, a solid-state battery, an air cell, a zinc-air battery, a capacitor, a lithium ion capacitor, an electric double layer capacitor, an ultracapacitor, a supercapacitor, and the like.

[0075]An electrode of one embo

[0096]For example, as described later in Example 2, when polybenzoxazine and PVdF are used as the binder, discharge capacity can be higher than when PVdF is used alone as the binder.

[0097]The binder may be a composite material of a compound with a benzoxazine ring and another compound. For example, the binder may be a copolymer of a benzoxazine resin and any of a fluororesin, an epoxy resin, a phenol resin, and the like.

[0098]The electrode of one embodiment of the present invention can be used in a power storage device. The power storage device includes a pair of electrodes (a positive electrode and a negative electrode), and the electrodes each include an active material layer. Each of the positive electrode active material layer and the negative electrode active material layer preferably includes a binder.

[0099]In the power storage device of one embodiment of the present invention, polybenzoxazine is used as a binder in at least one of the positive electrode active material layer and

Embodiment 2

[0161]In this embodiment, an active material that can be used for the electrode of one embodiment of the present invention is described with reference to FIGS. 2A and 2B, FIG. 3, FIGS. 4A and 4B, and FIG. 5.

[0162]Note that an active material generally refers only to a material that is involved in intercalation and deintercalation of ions functioning as carriers; however, an active material described in this specification and the like also includes a layer (coating layer) that covers an “active material” in some cases.

[0163]In this embodiment, a “particle containing a lithium manganese complex oxide” that can be used for an active material and a manufacturing method thereof will be described.

[0164]A lithium manganese complex oxide is strongly basic. For its resistance to a base, polybenzoxazine can be favorably used as a binder in the case where an active material is formed using a lithium manganese complex oxide.

[0165]When the electrode including the active material describ