Sharp Laboratories of America, Inc

University of Texas System

Jie Song

Yuhao Lu

Xin Zhao

Jong-Jan Lee

Sean Vail

Long Wang

A method is provided for synthesizing metal cyanometallate (MCM). The method provides a solution of AM1(CN); where 'A' is selected from a first group of metals and M1 is selected from a second group of metals. The method adds a material including M2 to the solution to form a liquid phase material that may be either a suspension or a solution. M2 is selected from the second group of metals. The method adds acid to the liquid phase material. The addition of acid to the liquid phase material decomposes the M2 material into M2-ions. Simultaneous with the addition of the acid, a precipitate of AM1M2(CN)HO is formed, whereis in a range of 1 to 2. A variation of the above-described synthesis method is also provided.

Metal cyanometallate synthesis method

An alkali-ion battery is provided with a transition metal cyanometallate (TMCM) sheet cathode and a non-alkaline metal anode. The fabrication method mixes TMCM powders, conductive additives, and a polytetrafluoroethylene binder with a solution containing water, forming a wet paste. The wet paste is formed into a free-standing sheet of cathode active material, which is laminated to a cathode current collector, forming a cathode electrode. The free-standing sheet of cathode active material has a thickness typically in the range of 100 microns to 2 millimeters. The cathode electrode is assembled with a non-alkaline metal anode electrode and an ion-permeable membrane interposed between the cathode electrode and anode electrode, forming an assembly. The assembly is dried at a temperature of greater than 100 degrees C. The dried assembly is then inserted into a container (case) and electrolyte is added. Thick anodes made from free-standing sheets of active material can be similarly formed.

Alkali-ion battery with enhanced transition metal cyanometallate electrode structure

A battery is provided with a hexacyanometallate cathode. The battery cathode is made from hexacyanometallate particles overlying a current collector. The hexacyanometallate particles have the chemical formula AM1M2(CN).d[HO].e[HO], where A is a metal from Groups 1A, 2A, or 3A of the Periodic Table, where M1 and M2 are each a metal with 2+ or 3+ valance positions, where '' and '' indicate zeolitic and bound water, respectively, where d is 0, and e is greater than 0 and less than 8. The anode material may primarily be a material such as hard carbon, soft carbon, oxides, sulfides, nitrides, silicon, metals, or combinations thereof. The electrolyte is non-aqueous. A method is also provided for fabricating hexacyanometallate with no zeolitic water content in response to dehydration annealing at a temperature of greater than 120 degrees C. and less than 200 degrees C.

Prussian blue analogue electrodes without zeolitic water content

A sodium or potassium battery is provided, prior to an initial charge and discharge cycle, with a halogen salt additive. As is conventional, the battery is made up of the following components: an anode, a cathode, and an electrolyte. In addition, the battery includes a halogen salt (MX), where M is a metal and X is a halogen element. The halogen salt is added to the anode, the cathode, the electrolyte, or combinations thereof. The concentration MX with respect to the component(s) to which it is added is in the range of 0.01% to 10% in weight. The element X can be selected from the group of halogen elements listed in the Periodic Table. M is a material such as lithium, sodium, potassium, cesium, magnesium, calcium, barium, titanium, manganese, iron, cobalt, nickel, copper, zinc, ammonium, or combinations thereof. Advantageously, the electrolyte may be either aqueous or non-aqueous.

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Vancouver, WA, United States of America

Jie Song