摘要:
The present invention provides for the preparation of an “optimized” lithium vanadium phosphate material. The materials are synthesized under conditions that avoid exposure to reducing gases, such as hydrogen, at high temperatures and thus materials of high performance are produced. The lithium vanadium phosphate materials so produced find use in producing electrodes for electrochemical cells.
摘要:
Methods for producing an electrode active material precursor, comprising; a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; and b) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.
摘要:
The present invention provides a positive electrode material for lithium and lithium-ion secondary cells which exhibits good cycleability, reversible specific capacity, and structural stability. The positive electrode material comprises a lithium multi metal oxide having a spinel structure and described by the general formula:Li.sub.1+X Mn.sub.2-Y M.sub.m.sbsb.1.sup.1 M.sub.m.sbsb.2.sup.2 . . . M.sub.m.sbsb.k.sup.k O.sub.4+Zwherein M.sup.1, M.sup.2, . . . M.sup.k are at least two cations different than lithium or manganese, selected from the group consisting of alkaline earth metals, transition metals, B, Al, Si, Ga and Ge;X, Y, m.sub.1,m.sub.2, . . . m.sub.k are numbers between 0 and 0.2;m.sub.1, m.sub.2 and Y are greater than 0;Z is a number between -0.1 and 0.2; andwherein the metals M.sup.1, M.sup.2, . . . M.sup.k and the corresponding values m.sub.1, m.sub.2, . . . m.sub.k satisfy the following equation and inequality: ##EQU1## wherein V.sub.1, V.sub.2, . . . V.sub.k are the corresponding valence states of the cations M.sup.1, M.sup.2, . . . M.sup.k.
摘要:
Methods for producing an electrode active material precursor, comprising; a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; and b) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.
摘要:
Methods for producing an electrode active material precursor, comprising: a) producing a mixture comprising particles of lithium hydrogen phosphate, having a first average particle size, and a metal hydroxide, having a second average particle size; and b) grinding said mixture in a jet mill for a period of time suitable to produce a generally homogeneous mixture of particles having a third average size smaller than said first average size. The precursor may be used as a starting material for making electrode active materials for use in a battery, comprising lithium, a transition metal, and phosphate or a similar anion.
摘要:
A novel method of preparing a spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound with low lattice distortion and a highly ordered and homogeneous structure for 4 V secondary lithium and lithium ion cells is provided. The method of preparing the spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compound comprises mixing at least one manganese compound with at least one lithium compound and firing the mixture at three different temperature ranges with corresponding gas flow rates to form the spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds have a mean X value of between about 0.01 and 0.05 and a full width at half maximum of the x-ray diffraction peaks at a diffraction angle 2.theta. of planes (400) and (440) using CuK.alpha..sub.1 rays of between about 0.10.degree. and 0.15.degree.. The spinel Li.sub.1+X Mn.sub.2-X O.sub.4 intercalation compounds may be used in the positive electrodes of secondary lithium and lithium ion cells to provide cells having high specific capacities and long cycling lives.
摘要:
The present invention is directed to a method for making electrode active materials represented by the general formula: Aa(VO)bXO4, wherein: (a) A is an alkali metal or mixture of alkali metals, and 0
摘要:
The present invention provides for the preparation of an “optimized” lithium vanadium phosphate material. The materials are synthesized under conditions that avoid exposure to reducing gases, such as hydrogen, at high temperatures and thus materials of high performance are produced. The lithium vanadium phosphate materials so produced find use in producing electrodes for electrochemical cells.
摘要:
The present invention relates to a method for preparing a lithium vanadium phosphate material comprising forming a aqueous slurry (in which some of the components are at least partially dissolved) comprising a polymeric material, an acidic phosphate anion source, a lithium compound, V2O5 and a source of carbon; wet blending said slurry, spray drying said slurry to form a precursor composition; and heating said precursor composition to produce a lithium vanadium phosphate. In one embodiment the present invention relates to a method for preparing a lithium vanadium phosphate which comprises reacting vanadium pentoxide (V2O5) with phosphoric acid (H3PO4) to form a partially dissolved slurry; then mixing with an aqueous solution containing lithium hydroxide; adding a polymeric material and a source of carbon to form a slurry; wet blending said slurry; spray drying said slurry to form a precursor composition; and heating said precursor composition for a time and at a temperature sufficient to produce a lithium vanadium phosphate compound. In an alternative embodiment the present invention relates to a method for preparing a lithium vanadium phosphate which comprises preparing an aqueous solution of lithium hydroxide; partially dissolving vanadium pentoxide in said aqueous solution; adding phosphoric acid to the aqueous solution; adding a polymeric material and a source of carbon to the solution containing vanadium pentoxide to form a slurry; spray drying said slurry to form a precursor composition; and heating said precursor composition for a time and at a temperature sufficient to form a lithium vanadium phosphate. The electrochemically active lithium vanadium phosphate so produced is useful in making electrodes and batteries.
摘要翻译:本发明涉及一种制备磷酸钒锂材料的方法,包括形成包含聚合物材料,酸性磷酸盐阴离子源,锂化合物,V 2 O 5和/或其混合物的含水浆料(其中一些成分至少部分溶解) 碳源 湿混合所述浆料,喷雾干燥所述浆料以形成前体组合物; 并加热所述前体组合物以产生磷酸钒锂。 在一个实施方案中,本发明涉及一种制备磷酸钒锂的方法,其包括使五氧化二钒(V 2 O 5)与磷酸(H 3 PO 4)反应以形成部分溶解的浆料; 然后与含有氢氧化锂的水溶液混合; 添加聚合物材料和碳源以形成浆料; 湿混合所述浆料; 喷雾干燥所述浆料以形成前体组合物; 并加热所述前体组合物一段时间和足以产生磷酸钒锂化合物的温度。 在替代实施方案中,本发明涉及一种制备磷酸钒锂的方法,其包括制备氢氧化锂水溶液; 将五氧化二钒部分溶解在所述水溶液中; 向该水溶液中加入磷酸; 向含有五氧化二钒的溶液中加入聚合物材料和碳源以形成浆料; 喷雾干燥所述浆料以形成前体组合物; 并将所述前体组合物加热足以形成磷酸钒锂的时间和温度。 如此生产的电化学活性锂钒磷酸盐可用于制造电极和电池。
摘要:
The present invention relates general to a method for making an alkali metal hydrogen phosphate of the general formula AxH3−xPO4, wherein A is an alkali metal and 0≦x≦3, prepared by admixing an alkali metal-containing compound, a phosphate-supplying compound, and water, where water is present in the mixture at a level of from about 5% to 25% by weight.
摘要翻译:本发明涉及一种制备通式AxH3-xPO4的碱金属磷酸氢盐的方法,其中A为碱金属,0 <= x <= 3,其通过将含碱金属的化合物,磷酸盐 其中水以混合物中的约5重量%至25重量%的水平存在于水中。