Abstract: A solid-state rechargeable 3D microbattery is provided that has improved power density, energy density, and cycle lifetimes. These improvements are afforded by providing a solid-state electrolyte that is composed of crystalline Li1+xAlxTi2?x(PO4)3, wherein x is from 0 to 2. The solid-state electrolyte that is composed of crystalline Li1+xAlxTi2?x(PO4) has a high ionic conductivity (which is greater than 10?4 Siemens/cm) as well as high chemical stability.

Abstract: A solid-state rechargeable 3D microbattery is provided that has improved power density, energy density, and cycle lifetimes. These improvements are afforded by providing a solid-state electrolyte that is composed of crystalline Li1+xAlxTi2?x(PO4)3, wherein x is from 0 to 2. The solid-state electrolyte that is composed of crystalline Li1+xA1xTi2?x(PO4) has a high ionic conductivity (which is greater than 10?4 Siemens/cm) as well as high chemical stability.

Abstract: Disclosed herein are two-dimensional (2D) nanosheets comprising a continuous transition metal oxide phase permeated by a plurality of pores. The plurality of pores can have an average characteristic dimension of from 1 nm to 30 nm. Also disclosed herein are methods of making the 2D nanosheets described herein. The 2D nanosheets can be prepared by reacting a graphene template with a transition metal compound to form a nanosheet precursor and calcining the nanosheet precursor to form the 2D nanosheet. Methods of use of the 2D nanosheets, for example as electrodes in batteries, are also described.