摘要:
Supercapacitor cell electrode and separator elements formulated as membranes of plasticized polymers matrix compositions are laminated with electrically conductive current collector elements to form flexible, unitary supercapacitor structures. The matrix plasticizer component is extracted from the laminate with polymer-inert solvent and replaced with electrolyte solution to activate the supercapacitor. Various arrangements of cell structure elements provide parallel and series cell structures which yield improved specific energy capacity and increased voltage output for utilization demands. The supercapacitor elements may also be laminated with similar polymeric rechargeable battery cell structures to provide hybrid devices capable of delivering both high energy and high power as needed in electronic systems.
摘要:
An apparatus and method for monitoring structural changes of an electrode in a rechargeable battery include an in situ x-ray study electrochemical cell holder (30) comprising top and bottom cell holder members (32, 34) including at least one beryllium window element (36) for transmission of diffractometer x-radiation. A rechargeable battery cell (43) mounted within the x-ray cell holder enclosure comprises an electrolyte/separator element (68) interposed between positive and negative electrodes (64, 66). A current collector element (70) formed of an electrically-conductive open-mesh grid is disposed between the positive electrode and the separator to enable ion-conducting contact of the electrode and separator while maintaining electrical continuity between the electrode and an external x-ray cell holder terminal (54). As a result of this arrangement, the positive electrode need not contact the window element to establish an electrical battery circuit, but may be sufficiently spaced from the window to avoid electrolytic corrosion of the beryllium element. The in situ x-ray electrochemical cell holder and battery cell structure allow for continuous monitoring of the structural changes in electrode materials during charge/discharge cycling.
摘要:
A rechargeable lithiated intercalation battery cell having reduced self-discharge comprises a negative electrode, a nonaqueous electrolyte, and a positive electrode wherein the surfaces of the aggregate lithiated intercalation composition particulates comprising the positive cell electrode have been coated with a passivating layer of a composition comprising a borate, lithiated borate, aluminate, lithiated aluminate, silicate, lithiated silicate, or mixtures thereof.
摘要:
Supercapacitor cell electrode and separator elements formulated as membranes of plasticized polymeric matrix compositions are laminated with electrically conductive current collector elements to form flexible, unitary supercapacitor structures. The matrix plasticizer component is extracted from the laminate with polymer-inert solvent and replaced with electrolyte solution to activate the supercapacitor. Various arrangements of cell structure elements provide parallel and series cell structures which yield improved specific energy capacity and increased voltage output for utilization demands. The supercapacitor elements may also be laminated with similar polymeric rechargeable battery cell structures to provide hybrid devices capable of delivering both high energy and high power as needed in electronic systems.
摘要:
The extent of self-discharge of rechargeable Li-ion secondary batteries is significantly reduced by treatment of LiMn.sub.2 O.sub.4 intercalation compound electrode material with a chelating agent, such as acetylacetone. This treatment decreases the incidence of non-coordinated Mn-ion sites which can lead to battery electrolyte decomposition and resulting loss of battery capacity. The treatment, which also includes annealing at about 400.degree. C. to 800.degree. C., further prevents such decomposition by varying the surface area and topography of the potentially catalytic electrode material.
摘要:
The present invention relates to secondary lithium batteries which include inorganic compound for the negative electrode and a cathode compound for the positive electrode which comprises Li2Mn2−xMexO4−zFz wherein 0≦X≦0.5 and can be optimized to match the irreversible capacity loss associated with a chosen inorganic negative electrode; 0≦Z≦0.5; and Me is selected from the group consisting of Al, Cr, Zn, Co, Ni, Li, Mg, Fe, Cu, Ti, Si or combinations thereof. In addition, the present invention relates to rechargeable plastic lithium ion batteries having a positive electrode, a negative electrode, and a separator element arranged between the electrodes, wherein the positive electrode includes an intercalation compound of Li2Mn2−xMexO4−zFz as set forth above and the negative electrode includes an active inorganic compound.
摘要翻译:本发明涉及二次锂电池,其包括用于负极的无机化合物和用于正电极的阴极化合物,其包含Li 2 Mn 2+ -xMexO 4-z F z,其中0 <= X <= 0.5并且可以被优化以匹配相关的不可逆容量损失 与选择的无机负极; 0 <= Z <= 0.5; Me选自Al,Cr,Zn,Co,Ni,Li,Mg,Fe,Cu,Ti,Si或其组合。 此外,本发明涉及具有设置在电极之间的正极,负极和隔板元件的可再充电塑料锂离子电池,其中正电极包括如上所述的Li 2 Mn 2-x MexO 4-zF z的插层化合物和 负极包括活性无机化合物。
摘要:
Li.sub.x CoO.sub.2 wherein x is about 1.00 to 1.15 is annealed at about 950.degree. C. to 1000.degree. C. for about 0.25 to 10 hours to yield a lithium intercalation material which is used in an electrode to provide a rechargeable battery having high specific capacity and the capability of maintaining such capacity over numerous operating charge/discharge cycles.
摘要:
The cycling stability and capacity of li-ion rechargeable batteries are improved by the use of lithium manganese oxy-fluoride electrode component intercalation materials having the general formula, Li.sub.1+x M.sub.y Mn.sub.2-x-y O.sub.4-z F.sub.z, where M is a transition metal, e.g., Co, Cr, or Fe, and x.ltoreq.0.4, y.ltoreq.0.3, and 0.05.ltoreq.z.ltoreq.1.0.
摘要:
A method of making a single phase, layered lithiated transition metal oxide material which comprises reacting a transition metal hydroxide with a lithium source in a basic solution in the presence of water at a pressure greater than atmospheric and at a temperature of from about 50.degree. C. to 150.degree. C.
摘要:
LiCoO.sub.2 and LiNiO.sub.2 are fully delithiated electrochemically using solid state electrolytic cells and oxidation resistant electrolytes to yield new phases of CoO.sub.2 and NiO.sub.2.