Composite electrode material, method for manufacturing the same, composite electrode comprising the same and lithium-based battery comprising the said composite electrode

A method for manufacturing a composite electrode material, comprising the following steps:

• providing a mother core, wherein a material of the mother core is at least one selected from the group consisting of Si and Ge;
• oxidizing the mother core to form a mother oxidized layer on a surface of the mother core, wherein a material of the mother oxidized layer is a fully oxidized compound of Si, a fully oxidized compound of Ge or a combination thereof;
• and
• breaking the mother core with the mother oxidized layer formed thereon to obtain a composite electrode material, which comprises:
• a core derived from the mother core;
• and an oxidized layer derived from the mother oxidized layer, wherein the oxidized layer partially exposes the core, and a material of the core exposed from the oxidized layer reacts with lithium ions for lithiation and de-lithiation.

A composite electrode, comprising:

• a substrate;
• and
• an active material layer disposed on the substrate and comprising a composite electrode material, wherein the composite electrode material comprises:
• a core, wherein a material of the core is at least one selected from the group consisting of Si, Ge, and a partially oxidized compound thereof;
• and
• an oxidized layer encapsulating at least a portion of a surface of the core, wherein a material of the oxidized layer is a fully oxidized compound of Si, a fully oxidized compound of Ge or a combination thereof,
• wherein the material in a portion of the core reacts with lithium ions for lithiation and de-lithiation.

A lithium-based battery, comprising:

• a composite electrode;
• a counter electrode opposite to the composite electrode;
• a separator disposed between the composite electrode and the counter electrode;
• and
• an electrolyte layer disposed between the composite electrode and the separator and also disposed between the counter electrode and the separator,
• wherein the composite electrode comprises:
• a substrate;
• and
• an active material layer disposed on the substrate and comprising a composite electrode material, wherein the composite electrode material comprises:
• a core, wherein a material of the core is at least one selected from the group consisting of Si, Ge, and a partially oxidized compound thereof;
• and
• an oxidized layer encapsulating at least a portion of a surface of the core, wherein a material of the oxidized layer is a fully oxidized compound of Si, a fully oxidized compound of Ge or a combination thereof,
• wherein the material in a portion of the core reacts with lithium ions for lithiation and de-lithiation.