Patent ID: 8597838

Claim:
A method of forming a composite core shell material comprising: forming a first mixture including a solid component of a first portion of lithium sulfide (Li 2 S) and diphosphorus pentasulfide (P 2 S 5 ) in a ratio ranging from 0.75:1 to 1.25:1 with a liquid solvent comprising carbon and hydrogen to form a first shell of the composite core shell material, wherein the core of the composite core shell material is comprised of lithium sulfide (Li 2 S) and the first shell of the composite core shell material is comprised of Li 4 P 2 S 7 ; forming a second mixture of a second portion of lithium sulfide and carbon powder; combining the second mixture with the first mixture after the first shell of the composite core shell material is formed, wherein the combining of the first mixture with the second mixture provides at least one second shell that is comprised of Li 4 P 2 S 7 and carbon, wherein the at least one second shell is in contact with the first shell; and removing the liquid solvent.