Particle, electrode, power storage device, electronic device, and method for manufacturing electrode
To increase capacity per weight of a power storage device, a particle includes a first region, a second region in contact with at least part of a surface of the first region and located on the outside of the first region, and a third region in contact with at least part of a surface of the second region and located on the outside of the second region. The first and the second regions contain lithium and oxygen. At least one of the first region and the second region contains manganese. At least one of the first and the second regions contains an element M. The first region contains a first crystal having a layered rock-salt structure. The second region contains a second crystal having a layered rock-salt structure. An orientation of the first crystal is different from an orientation of the second crystal.
1. A method for manufacturing an electrode layer, comprising the steps of:
mixing a particle, a binder, and a solvent to form a mixture;
forming the mixture over a current collector to form a mixed layer;
performing heat treatment on the mixed layer; and
performing crushing treatment on the mixed layer, whereby a cleavage plane is formed on the particle,
wherein the particle comprises lithium, manganese, an element M, and oxygen,
wherein the cleavage plane is coated with graphene,
wherein the element represented by M is one or more elements selected from Cr, Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, Zn, Si, and P, and
wherein the electrode layer comprises a compound having a bond between at least one element selected from lithium, manganese, the element M, and oxygen and at least one element in the binder.
2. The method for manufacturing an electrode layer according to claim 1 , wherein the compound comprises fluorine and at least one of lithium, manganese, and the element M.
3. An electrode layer on a current collector, comprising:
a particle including a cleavage plane;
a binder; and
a solvent,
wherein the particle comprises lithium, manganese, an element M, and oxygen,
wherein the cleavage plane is coated with graphene,
wherein the element represented by M is one or more elements selected from Cr, Ni, Ga, Fe, Mo, In, Nb, Nd, Co, Sm, Mg, Al, Ti, Cu, Zn, Si, and P, and
wherein the electrode layer comprises a compound having a bond between at least one element selected from lithium, manganese, the element M, and oxygen and at least one element in the binder.
4. The electrode layer according to claim 3 , wherein the compound comprises fluorine and at least one of lithium, manganese, and the element M.
5. A power storage device comprising the electrode layer according to claim 3 .
6. An electronic device comprising a semiconductor device, a display device and the power storage device according to claim 5 .