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A facile solvothermal synthesis approach for chemical composition control in ternary Bi-S-I systems is reported by simply controlling the sulfide concentration. We demonstrate the application of these bismuth-based ternary mixed-anion compounds as high capacity anode materials in rechargeable batteries. Cells utilising Bi 13 S 18 I 2 achieved an initial capacity value of 807 mA h g -1 , while those with BiSI/Bi 13 S 18 I 2 a value of 1087 mA h g -1 in lithium-ion battery systems.