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We report a thermally stable high-performance lithium battery using an
electrochemically synthesized three-dimensional porous molybdenum
disulfide/graphene composite electrode and a phosphonium-based ionic
liquid (IL) electrolyte. Benefiting from the structural merits of the chosen
electrode and the thermal stability of the electrolyte, the cell coupled
with a Li foil exhibits excellent rate performance and cycling
capability at room temperature; and that is retained with an even
better rate capability at an elevated temperature of 50 8C. This work
may provide a new avenue for the development of safe and high
performance lithium-ion batteries at high temperature.