Abstract:
The described embodiments provide an energy storage device that includes a positive electrode including an active material that can store and release ions, a negative electrode including a V, Nb co-doped TiO 2 (B), and a non-aqueous electrolyte including lithium ions. At least one embodiment provides a negative electrode active material including V, Nb co-doped TiO 2 (B). At least one embodiment provides a wet-chemistry process to prepare V, Nb co-doped TiO 2 (B).
Abstract:
Various embodiments of the present invention relate to electrode materials based on iron phosphates that can be used as the negative electrode materials for aqueous sodium ion batteries and electrochemical capacitors. At least one embodiment includes a negative electrode material for an aqueous sodium ion based energy storage device. The negative electrode material with a non-olivine crystal structure includes at least one phosphate selected from iron hydroxyl phosphate, Na 3 Fe 3 (PO 4 ) 4 , Na 3 Fe(PO 4 ) 2 , iron phosphate hydrate, ammonium iron phosphate hydrate, carbon-coated or carbon-mixed sodium iron phosphate. At least one embodiment includes an energy storage device that includes such a negative electrode material.
Abstract:
The described embodiments provide an energy storage device that includes a positive electrode including a material that stores and releases ion, a negative electrode including Nb-doped TiO 2 (B), and a non-aqueous electrolyte containing lithium ions. The described embodiments provide a method including the steps of combining at least one titanium compound and at least one niobium compound in ethylene glycol to form a precursor solution, adding water into the precursor solution to induce hydrolysis and condensation reactions, thereby forming a reaction solution, heating the reaction solution to form crystallized particles, collecting the particles, drying the collected particles, and applying a thermal treatment at a temperature > 350°C to the dried particles to obtain Nb-doped TiO 2 (B) particles.
Abstract:
The described embodiments provide an energy storage device that includes a positive electrode including an active material that can store and release ions, a negative electrode including an active material that is a lithiated nano-architectured active material including tin and at least one stress-buffer component, and a non-aqueous electrolyte including lithium. The negative electrode active material is nano-architectured before lithiation.