A high-power and fast charging Li-ion battery with outstanding cycle-life

Electrochemical energy storage devices based on Li-ion cells currently power almost all electronic devices and power tools. The development of new Li-ion cell configurations by incorporating innovative functional components (electrode materials and electrolyte formulations) will allow to bring this technology beyond mobile electronics and to boost performance largely beyond the state-of-the-art. Here we demonstrate a new full Li-ion cell constituted by a high-potential cathode material, i.e. LiNi_0.5Mn_1.5O₄, a safe nanostructured anode material, i.e. TiO₂, and a composite electrolyte made by a mixture of an ionic liquid suitable for high potential applications, i.e. Pyr_1,4PF₆, a lithium salt, i.e. LiPF₆, and standard organic carbonates. The final cell configuration is able to reversibly cycle lithium for thousands of cycles at 1000 mAg^-1 and a capacity retention of 65% at cycle 2000.