Method for forming electrode, electrode, storage battery, and electric device
View Patent ↗An electrode improved for achieving a storage battery having both a high electrode strength and favorable electrode conductivity is provided. The electrode includes graphene and a modified polymer in an active material layer or includes a layer substantially formed of carbon particles and an active material layer including a modified polymer over a current collector. The modified polymer has a poly(vinylidene fluoride) structure and partly has a polyene structure or an aromatic ring structure. The polyene structure or the aromatic ring structure is sandwiched between poly(vinylidene fluoride) structures.
1. An electrode comprising:
an active material layer comprising:
an active material particle;
a graphene; and
a partly dehydrofluorinated poly(vinylidene fluoride) sandwiched by a poly(vinylidene fluoride); and
a current collector comprising:
a metal layer; and
a layer substantially formed of carbon particles,
wherein the layer substantially formed of carbon particles does not comprise a polymer,
wherein the partly dehydrofluorinated poly(vinylidene fluoride) comprises at least one of a polyene structure and an aromatic ring structure,
wherein in the partly dehydrofluorinated poly(vinylidene fluoride) a combined carbon atomic ratio of the aromatic ring structures and the polyene structures is less than 5% of a carbon atomic ratio of poly(vinylidene fluoride) structures, and
wherein the active material layer comprises a first region and a second region, and wherein a fluorine concentration in the first region is different from a fluorine concentration in the second region when measured by time-of-flight secondary ion mass spectrometry (ToF-SIMS).
2. The electrode according to claim 1 ,
wherein the polyene structure or the aromatic ring structure is located in a main chain of the partly dehydrofluorinated poly(vinylidene fluoride).
3. The electrode according to claim 1 , wherein the active material particle comprises lithium.
4. A storage battery comprising:
the electrode according to claim 1 ; and
an electrolyte.
5. An electric device comprising:
the storage battery according to claim 4 ; and
a housing, a display device, or a switch.
6. The electrode according to claim 1 , wherein the layer substantially formed of carbon particles covers the metal layer.