Abstract: A method of making an anti-perovskite solid electrolyte is provided. The method includes: providing an anti-perovskite material that is in the form of a powder; heating a die to a temperature between approximately 200 and 400° C.; loading the anti-perovskite powder into the heated die; compressing the anti-perovskite powder in the heated die; and allowing the heated die to cool to ambient temperature under pressure by maintaining the compression until the die has cooled to ambient temperature. The compression may be performed uniaxially and at a pressure in a range of 1 to 500 MPa. The anti-perovskite may undergo phase transformation, densification, and grain growth during compression at the elevated temperature. An anti-perovskite solid electrolyte formed by the method, and an anti-perovskite solid-state battery including the solid electrolyte are also provided.

Abstract: Stabilized layered lithium metal oxide cathode materials are described which include excess lithium, Ni, Mn, and at least one other metal ion. The materials comprise a layered LiMO2-type material in which M comprises a combination of Ni, Mn, and at least one other metal ion that includes less than about 6 mol % Co; and which has about 1 to 6 percent excess lithium. In one embodiment, the stabilized lithium metal oxide cathode material comprises a composition having the empirical formula xLi2MnO3·(1?x)LiNi0.5+?/2Mn0.5??Co?/2O2, wherein 0<x?0.1; and 0???0.2. In another embodiment, the stabilized lithium metal oxide cathode material comprises a composition having the empirical formula Li1+3y[NiaMnbM?c]1?yO2, wherein M? is one of more metal selected from the group consisting of Co, Al, Fe, Mg, and Ti; 0<y?0.02; 0.85?a?0.96; 0.03?b?0.1; and 0.01?c?0.1.

Abstract: Stabilized layered lithium metal oxide cathode materials are described which include excess lithium, Ni, Mn, and at least one other metal ion. The materials comprise a layered LiMO2-type material in which M comprises a combination of Ni, Mn, and at least one other metal ion that includes less than about 6 mol % Co; and which has about 1 to 6 percent excess lithium. In one embodiment, the stabilized lithium metal oxide cathode material comprises a composition having the empirical formula xLi2MnO3.(1?x)LiNi0.5+?/2Mn0.5??Co?/2O2, wherein 0<x?0.1; and 0???0.2. In another embodiment, the stabilized lithium metal oxide cathode material comprises a composition having the empirical formula Li1+3y[NiaMnbM?c]1?yO2, wherein M? is one of more metal selected from the group consisting of Co, Al, Fe, Mg, and Ti; 0<y?0.02; 0.85?a?0.96; 0.03?b?0.1; and 0.01?c?0.1.

Abstract: An electrode comprises an electrode core. A composite bilayer coating is conformally disposed on the electrode core. The composite bilayer coating comprises a first layer disposed on at least a portion of the electrode core. The first layer comprises a metal fluoride, a metal oxide or a metal sulfide. A second layer is disposed on the first layer and comprises a metal fluoride, a metal oxide or a metal sulfide.

Abstract: An electrode comprises an electrode core. A composite bilayer coating is conformally disposed on the electrode core. The composite bilayer coating comprises a first layer disposed on at least a portion of the electrode core. The first layer comprises a metal fluoride, a metal oxide or a metal sulfide. A second layer is disposed on the first layer and comprises a metal fluoride, a metal oxide or a metal sulfide.

Abstract: The surface of a lithium ion cathode material (e.g., a lithium metal oxide material capable of releasing and accepting lithium ions during charging and discharging, respectively, of a lithium ion electrochemical cell) is coated with a lithium metal oxide (LMO) material comprising a high-valent metal to, inter alia, reduce interfacial resistance toward lithium exchange. Li-rich phases on the surface of the treated LMO particles allow for better lithium ion diffusion. The inclusion of elements that form phases with lithium and can substitute in the host structure allow for mixing across interfaces leading to more robust structures that better mimic epitaxial-type layers. Inclusion of doping elements in place of some of the high-valent metal in the surface-treating composition provides unexpectedly improved performance over surface treatments comprising lithium metal oxides that only include a high-valent metal.

Abstract: The surface of a lithium ion cathode material (e.g., a lithium metal oxide material capable of releasing and accepting lithium ions during charging and discharging, respectively, of a lithium ion electrochemical cell) is coated with a lithium metal oxide (LMO) material comprising a high-valent metal to, inter alia, reduce interfacial resistance toward lithium exchange. Li-rich phases on the surface of the treated LMO particles allow for better lithium ion diffusion. The inclusion of elements that form phases with lithium and can substitute in the host structure allow for mixing across interfaces leading to more robust structures that better mimic epitaxial-type layers. Inclusion of doping elements in place of some of the high-valent metal in the surface-treating composition provides unexpectedly improved performance over surface treatments comprising lithium metal oxides that only include a high-valent metal.

Abstract: This invention relates to methods of preparing positive electrode materials for electrochemical cells and batteries. It relates, in particular, to a method for fabricating lithium-metal-oxide electrode materials for lithium cells and batteries. The method comprises contacting a hydrogen-lithium-manganese-oxide material with one or more metal ions, preferably in an acidic solution, to insert the one or more metal ions into the hydrogen-lithium-manganese-oxide material; heat-treating the resulting product to form a powdered metal oxide composition; and forming an electrode from the powdered metal oxide composition.

Abstract: The present invention provides an electrode material suitable for use as a cathode in a sodium electrochemical cell or battery, the electrode comprising a layered material of formula NacLidNieMnfMzOb, wherein M comprises one or more metal cation, 0.24?c/b?0.5, 0<d/b?0.23, 0?e/b?0.45, 0?f/b?0.45, 0?z/b?0.45, the combined average oxidation state of the metal components (i.e., NacLidNieMnfMz) is in the range of about 3.9 to 5.2, and b is equal to (c+d+Ve+Xf+Yz)/2, wherein V is the average oxidation state of the Ni, X is the average oxidation state of the Mn, and Y is the average oxidation state of the M in the material. The combined positive charge of the metallic elements is balanced by the combined negative charge of the oxygen anions, the Na is predominately present in a sodium layer, and the Mn, Ni, and M are predominately present in a transition metal layer.

Abstract: This invention relates to methods of preparing positive electrode materials for electrochemical cells and batteries. It relates, in particular, to a method for fabricating lithium-metal-oxide electrode materials for lithium cells and batteries. The method comprises contacting a hydrogen-lithium-manganese-oxide material with one or more metal ions, preferably in an acidic solution, to insert the one or more metal ions into the hydrogen-lithium-manganese-oxide material; heat-treating the resulting product to form a powdered metal oxide composition; and forming an electrode from the powdered metal oxide composition.

Abstract: This invention relates to positive electrode materials for electrochemical cells and batteries. It relates, in particular, to electrode precursor materials comprising manganese ions and to methods for fabricating lithium-metal-oxide electrode materials and structures using the precursor materials, notably for lithium cells and batteries. More specifically, the invention relates to lithium-metal-oxide electrode materials with layered-type structures, spinel-type structures, combinations thereof and modifications thereof, notably those with imperfections, such as stacking faults and dislocations. The invention extends to include lithium-metal-oxide electrode materials with modified surfaces to protect the electrode materials from highly oxidizing potentials in the cells and from other undesirable effects, such as electrolyte oxidation, oxygen loss and/or dissolution.

Abstract: The present invention provides an electrode material suitable for use as a cathode in a sodium electrochemical cell or battery, the electrode comprising a layered material of formula NacLidNieMnfMzOb, wherein M comprises one or more metal cation, 0.24?c/b?0.5, 0<d/b?0.23, 0?e/b?0.45, 0?f/b?0.45, 0?z/b?0.45, the combined average oxidation state of the metal components (i.e., NacLidNieMnfMz) is in the range of about 3.9 to 5.2, and b is equal to (c+d+Ve+Xf+Yz)/2, wherein V is the average oxidation state of the Ni, X is the average oxidation state of the Mn, and Y is the average oxidation state of the M in the material. The combined positive charge of the metallic elements is balanced by the combined negative charge of the oxygen anions, the Na is predominately present in a sodium layer, and the Mn, Ni, and M are predominately present in a transition metal layer.