Layered titanium phosphate nanosheets with water in salt electrolyte toward high-voltage aqueous full lithium-ion batteries

Abstract

Aqueous lithium-ion batteries (ALIBs) featuring high-safety, low-cost, and environmental friendliness have dramatic potential in the area of energy storage batteries. The progress of aqueous lithium-ion batteries is restricted by the advanced electrode materials, which can maintain a robust structure after long-term cycling. In this work, we report a novel “rocking-chair” type aqueous full lithium-ion battery with titanium phosphate nanosheets (Ti(HPO₄)₂·H₂O) as the anode material. The fabricated aqueous full lithium-ion battery achieves a high capacity retention of 83% after 1000 cycles even at the high-voltage of 2.4 V, as well as an excellent rate performance.