Solid electrolyte coating of lithium-doped silicon oxide particles as anode active material
An anode material includes a plurality of negative solid-state electroactive particles. Each of the plurality of negative solid-state electroactive particles may include a lithium-doped silicon oxide and a solid electrolyte coating at least substantially continuously disposed over substantially all of the surface of the lithium-doped silicon oxide.
1 . An anode material comprising a plurality of negative solid-state electroactive particles, each of the plurality of negative solid-state electroactive particles consisting of:
a lithium-doped silicon oxide comprising Li y SiO x , y≤4, 0≤x≤2; and
a solid electrolyte coating comprising Li 3 PS 4 or Li 7−m PS 6−m X, where 0≤m≤1and where X is chlorine (Cl), bromine (Br), or iodine (I);
wherein the solid electrolyte coating has a thickness of about 20 nm to about 350 nm.
2 . The anode material of claim 1 , wherein the solid electrolyte coating is substantially continuously disposed over substantially all of the surface of the lithium-doped silicon oxide.
3 . The anode material of claim 1 , wherein the solid electrolyte coating has a thickness from about 50 nm to about 100 nm.
4 . The anode material of claim 1 , further comprising a carbon-based material.
5 . A method of preparing the anode material of claim 1 , the method comprising:
preparing a solid electrolyte precursor solution, the solid electrolyte precursor solution comprising a solid electrolyte precursor and a solvent; and
contacting a plurality of lithium-doped silicon oxide particles with the solid electrolyte precursor solution to form a solid electrolyte coating.
6 . The method of claim 5 , wherein the solid electrolyte precursor comprises P 4 S 16 , and wherein the solvent comprises n-methyl-2-pyrrolidone (NMP).
7 . The method of claim 5 , wherein the solid electrolyte precursor comprises Li 7−m PS 6−m X, where 0≤m≤1 and where X is chlorine (Cl), bromine (Br), or iodine (I), wherein the solvent comprises an ester and an alcohol as co-solvents.
8 . The method of claim 5 , wherein the silicon oxide is a lithium-doped silicon oxide when the silicon oxide is contacted with the solid electrolyte precursor solution.
9 . The method of claim 5 , wherein the silicon oxide is a non-lithiated silicon oxide when the silicon oxide is contacted with the solid electrolyte precursor solution, and further comprising lithiating the silicon oxide after the solid electrolyte coating is formed.
10 . The method of claim 5 , wherein contacting the plurality of silicon oxide particles with the solid electrolyte precursor solution comprises immersing the silicon oxide particles in the solid electrolyte precursor solution.
11 . An anode comprising:
a plurality of negative solid-state electroactive particles, each of the plurality of negative solid-state electroactive particles comprising:
a lithium-doped silicon oxide; and
a solid electrolyte coating, wherein the solid electrolyte coating has a thickness from about 20 nm to about 350 nm; and
a plurality of solid-state electrolyte particles consisting of a solid-state electrolyte; wherein the plurality of negative solid-state electroactive particles is present in an amount of greater than or equal to about 30 wt. % to less than or equal to about 98 wt. % and the plurality of solid-state electrolyte particles is present in an amount of greater than or equal to about 5 wt. % to less than or equal to about 20 wt. %.
12 . The anode of claim 11 , wherein the lithium-doped silicon oxide comprises Li y SiO x , y≤4, 0≤x≤2.
13 . The anode of claim 11 , wherein the solid electrolyte coating comprises Li 3 PS 4 .
14 . The anode of claim 11 , wherein the solid electrolyte coating comprises Li 7−m PS 6−m X, where 0≤m≤1 and where X is chlorine (Cl), bromine (Br), or iodine (I).
15 . The anode of claim 11 , wherein the solid electrolyte coating is substantially continuously disposed over substantially all of the surface of the lithium-doped silicon oxide.