Anode material, and electrochemical device and electronic device comprising the same

An anode, comprising an anode current collector and an anode active material layer, wherein the anode active material layer is located on at least one surface of the current collector, and wherein the anode active material layer comprises an anode material comprising:

• a silicon oxide core, the silicon oxide being represented by the general formula SiOx (0<x<2);
• and
• a shell, disposed on at least a portion of an outer surface of the silicon oxide core,
• wherein the shell comprises a silicate of M, and
• wherein M is selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ti, Zn and a combination thereof.

An electrochemical device, comprising a cathode, a separator, an electrolyte and an anode,

• wherein the anode comprises an anode current collector and an anode active material layer, wherein the anode active material layer is located on at least one surface of the current collector, and wherein the anode active material layer comprises an anode material comprising:
• a silicon oxide core, the silicon oxide being represented by the general formula SiOx (about 0<x<about 2);
• and
• a shell, disposed on at least a portion of an outer surface of the silicon oxide core,
• wherein the shell comprises a silicate of M, and
• wherein M is selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ti, Zn and a combination thereof.

An electronic device, comprising an electrochemical device, comprising a cathode, a separator, an electrolyte and an anode,

• wherein the anode comprises an anode current collector and an anode active material layer, wherein the anode active material layer is located on at least one surface of the current collector, and wherein the anode active material layer comprises an anode material comprising:
• a silicon oxide core, the silicon oxide being represented by the general formula SiOx (about 0<x<about 2);
• and
• a shell, disposed on at least a portion of an outer surface of the silicon oxide core,
• wherein the shell comprises a silicate of M, and
• wherein M is selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ti, Zn and a combination thereof.

A method for preparing an anode material comprising a silicon oxide core and a shell disposed on at least a portion of an outer surface of the silicon oxide core, wherein the silicon oxide is represented by the general formula SiOx (0<x<2), and the shell comprises a silicate of M, and M is selected from the group consisting of Mg, Ca, Sr, Ba, Al, Ti, Zn and a combination thereof,

• the method comprising:
• mixing an M source and a silicon oxide;
• carrying out a high-temperature treatment on the mixed material in an inert gas atmosphere at about 1000° C. to about 1400° C.;
• and
• grinding the material subjected to the high-temperature treatment.