Abstract:
At least one embodiment of the present invention provides preparation methods and compositions for nanoarchitectured multi-component materials based on carboncoated iron-molybdenum mixed oxide as the electrode material for energy storage devices. A sol-gel process containing soluble organics is a preferred method. The soluble organics could become a carbon coating for the mixed oxide after thermal decomposition. The existence of the carbon coating provides the mixed oxide with an advantage in cycling stability over the corresponding carbon-free mixed oxide. For the carbon-coated mixed oxide, a stable cycling stability at high charge/discharge rate (3A/g) can be obtained with Mo/Fe molar ratios ≥ 1/3. The cycling stability and rate capability could be tuned by incorporating a structural additive such as Al 2 O 3 and a conductive additive such as carbon nanotubes. The high rate performance of the multi-component material has been demonstrated in a full device with porous carbons as the positive electrode material.
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:
A rechargeable energy storage device is disclosed. In at least one embodiment the energy storage device includes an air electrode providing an electrochemical process comprising reduction and evolution of oxygen and a capacitive electrode enables an electrode process consisting of non-faradic reactions based on ion absorption/desorption and/or faradic reactions. This rechargeable energy storage device is a hybrid system of fuel cells and ultracapacitors, pseudocapacitors, and/or secondary batteries.
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.
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.