Lithium manganese composite oxide, secondary battery, and electrical device
AssigneeSemiconductor Energy Laboratory Co., Ltd.
InventorsTakahiro Kawakami, Tatsuya Ikenuma, Satoshi Seo
Life of this patent
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Abstract
The volume density or weight density of lithium ions that can be received and released in and from a positive electrode active material is increased to achieve high capacity and high energy density of a secondary battery. In a lithium manganese composite oxide, each particle includes a first region including a crystal with a layered rock-salt crystal structure and a second region including a crystal with a spinel crystal structure. The second region is in contact with the outside of the first region. The lithium manganese composite oxide has high structural stability and high capacity.
Claims17
A lithium manganese composite oxide comprising:
- a particle comprising a first region including a crystal with a layered rock-salt structure and a second region including a crystal with a spinel structure,
- wherein the second region is in contact with the first region,
- wherein the second region covers 10% or more of an entire outside surface of the first region,
- wherein the layered rock-salt structure is represented by LirMns-tMtO3,
- wherein 1.4≦r≦2, 0.7≦s<1.5, 0≦t<1.5, and s≧t are satisfied, and
- wherein an element M is silicon, phosphorus, or a metal element other than lithium and manganese.
A lithium manganese composite oxide comprising:
- a crystal region with a spinel structure on at least part of a surface of a particle including a crystal region with a layered rock-salt structure,
- wherein the crystal region with the spinel structure covers 10% or more of an entire surface of the particle,
- wherein the layered rock-salt structure is represented by LirMns-tMtO3,
- wherein 1.4≦r≦2, 0.7≦s<1.5, 0≦t<1.5, and s≧t are satisfied, and
- wherein an element M is silicon, phosphorus, or a metal element other than lithium and manganese.
A lithium manganese composite oxide comprising:
- a particle comprising a first region including a crystal with a layered rock-salt structure and a second region essentially consisting of a crystal with a spinel structure,
- wherein the particle has the second region on at least part of a surface thereof,
- wherein the second region includes a layered region,
- wherein the layered rock-salt structure is represented by LirMns-tMtO3,
- wherein 1.4≦r≦2, 0.7≦s<1.5, 0≦t<1.5, and s≧t are satisfied, and
- wherein an element M is silicon, phosphorus, or a metal element other than lithium and manganese.
A lithium manganese composite oxide comprising:
- a particle comprising a first region including a crystal with a layered rock-salt structure and a second region including a crystal with a spinel structure,
- wherein 10% or more of an entire outer surface of the particle is formed with a layered region having the spinel structure,
- wherein the layered rock-salt structure is represented by LirMns-t MtO3,
- wherein 1.4≦r≦2, 0.7≦s<1.5, 0≦t<1.5, and s≧t are satisfied, and
- wherein an element M is silicon, phosphorus, or a metal element other than lithium and manganese.
Dependencies are inferred from the claim text.