Electrochemical energy storage devices based on Li-ion cells currently power almost all electronic\uddevices and power tools. The development of new Li-ion cell configurations by incorporating innovative\udfunctional components (electrode materials and electrolyte formulations) will allow to bring this\udtechnology beyond mobile electronics and to boost performance largely beyond the state-of-theart.\udHere we demonstrate a new full Li-ion cell constituted by a high-potential cathode material,\udi.e. LiNi0.5Mn1.5O4, a safe nanostructured anode material, i.e. TiO2, and a composite electrolyte made\udby a mixture of an ionic liquid suitable for high potential applications, i.e. Pyr1,4PF6, a lithium salt, i.e.\udLiPF6, and standard organic carbonates. The final cell configuration is able to reversibly cycle lithium for\udthousands of cycles at 1000 mAg−1 and a capacity retention of 65% at cycle 2000.
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