50results about How to "Unit cell volume reduction" patented technology

The invention relates to a preparation method of a copper-barium-activated lithium iron phosphate anode material. The preparation method comprises the following steps of: mixing raw materials, such as a lithium source, an iron source, a phosphate radical source, a copper source and a barium source according to a mol ratio of 1 of Li to Cu to Ba to Fe to P of 1: (0.00002-0.00005):0.0003:1:1; performing high-speed ball milling at a rotating speed of 200r / min for 20 hours in an absolute ethyl alcohol medium; drying at 105-120 DEG C to obtain a precursor; and placing the precursor obtained by drying into a high-temperature furnace, and calcining the precursor at 500-750 DEG C for 24 hours in an ordinary pure nitrogen atmosphere to obtain the copper-barium-activated lithium iron phosphate anode material. Because a small amount of substituting copper and barium are doped, the shape and the particle size of the copper-barium-activated lithium iron phosphate anode material can be conveniently controlled to obtain a stable lithium iron phosphate compound, the crystal lattice of the lithium iron phosphate compound is activated, the diffusion coefficient of lithium ions is increased, and the first-time discharge capacity of the obtained material reaches 160.52mAh / g; the electric potential of a charging and discharging platform of the copper-barium-activated lithium iron phosphate anode material relative to a lithium electrode is about 3.5V, the initial discharge capacity is more than 168mAh / g, and after 100 times of charging and discharging circulation, the capacity is approximately attenuated by about 1.2 percent; and compared with a contrast embodiment without doping of LiFePO4, the copper-barium-activated lithium iron phosphate anode material has the advantage that: the specific capacity and the cycle stability are greatly improved.

The invention discloses a preparation method of manganese and barium activated lithium iron phosphate as a cathode material. The preparation method comprises the steps of: mixing raw materials including a lithium source, a manganese source, a barium source, an iron source and a phosphate source according to the proportion of 1mol:(0.00002-0.00005)mol:(0.0003)mol:1mol:1mol; then, performing high-speed ball milling at the rotation speed of 200r / min for 20h in an absolute ethyl alcohol medium; drying at 105-120 DEG C to obtain a precursor; placing the precursor obtained through drying in a high-temperature furnace; and calcinating for 24h at the high temperature of 500-750 DEG C in a common pure nitrogen atmosphere to obtain the manganese and barium activated lithium iron phosphate as the cathode material. Because a small amount of substitutive manganese and barium are doped, the shape and the particle size of a product are favorably controlled to obtain a stable lithium iron phosphate compound, of which the crystal lattice is activated, the lithium ion diffusion coefficient is increased, and the initial discharge capacity of the obtained cathode material reaches 160.52mAh / g; a charge-discharge platform of the cathode material is about 3.5V relative to a lithium electrode potential, the initial discharge capacity exceeds 168mAh / g, and the capacity is attenuated by about 1.2% after 100 times of charge-discharge cycles; and compared with a control embodiment, namely undoped LiFePO4, the cathode material is greatly improved in specific capacity and cyclic stability.

The invention provides a preparation method of a zirconium, barium activated lithium iron phosphate anode material, characterized in that: raw materials of lithium source, iron source, phosphate radial source, zirconium source and barium source are mixed according to the proportion of 1mol Li:0.00002-00005mol Zr:0.0003-0.003mol Ba:1mol Fe:1mol P, ball-milled for 20h in absolute ethyl alcohol medium at high rotation speed of 200r / minn and then dried at 105-120 DEG C to obtain a precursor, the dried precursor is placed into a high-temperature furnace and calcined for 24h at high temperature of 500-750 DEG C in a common pure nitrogen atmosphere to obtain the zirconium, barium activated lithium iron phosphate anode material. Because the zirconium, barium activated lithium iron phosphate anode material is doped with a small amount of zirconium, barium, the shape and particle diameter of the products are controlled, the stable lithium iron phosphate compound is obtained, the crystal lattice is activated, the diffusion coefficient of the lithium ion is increased and the first discharge capacity of the material reaches 160.52mAh / g; the electric potential of a discharge and charge platform is about 3.5V relative to the lithium electrode, the first discharge capacity exceeds 168mAh / g, the capacity attenuates by about 1.2% after 100 times of charge and discharge cycle. Compared with the non-doped LiFePO4 contrast embodiment, the capacity and the cycle stability of the doped LiFePO4 are relatively greatly improved.

The invention relates to a preparation method of a cobalt / barium activated lithium iron phosphate anode material, which comprises the following steps: mixing a lithium source, an iron source, a phosphate radical source, a cobalt source and a barium source at a ratio of 1mol Li : (0.00002-0.00005) mol Co : 0.0003 mol Ba : 1mol Fe : 1 mol P, performing high-speed ball milling in an anhydrous alcohol medium at a rotation speed of 200 r / min for 20 h, drying at 105-120 DEG C to obtain a precursor, placing the precursor obtained via the drying into a high-temperature furnace, and performing high-temperature calcination in a nitrogen atmosphere at 500-750 DEG C for 24 h to obtain the cobalt / barium activated lithium iron phosphate anode material. The doping of a small amount of cobalt / barium is helpful for controlling the morphological form and particle size of product and obtaining stable lithium iron phosphate compound, the crystal lattice of the cobalt / barium activated lithium ironphosphate anode material is activated so as to improve the lithium ion diffusion coefficient, and the initial discharge capacity of the obtained material is up to 160.52 mAh / g; the lithium electrode potential of the charging / discharging platform for the method is about 3.5 V, the initial discharging capacity is over 168 mAh / g, and the capacity after 100 cycles of charging / discharging is attenuated by about 1.2%; and comparing with the non-doped LiFePO4 comparison example, the specific capacity and cycle stability of the obtained material are greatly improved.

The invention discloses a preparation method of germanium and barium activated lithium iron phosphate as a cathode material. The preparation method comprises the steps of: mixing raw materials including a lithium source, a germanium source, a barium source, an iron source and a phosphate source according to the proportion of 1mol:(0.00002-0.00005)mol:(0.0003-0.003)mol:1mol:1mol; then, performing high-speed ball milling at the rotation speed of 200r / minm for 20h in an absolute ethyl alcohol medium; drying at 105-120 DEG C to obtain a precursor; placing the precursor obtained through drying in a high-temperature furnace; and calcinating for 24h at the high temperature of 500-750 DEG C in a nitrogen atmosphere to obtain the germanium and barium activated lithium iron phosphate as the cathode material. Because a small amount of substitutive germanium and barium are doped, the shape and the particle size of a product are favorably controlled to obtain a stable lithium iron phosphate compound, of which the crystal lattice is activated, the lithium ion diffusion coefficient is increased, and the initial discharge capacity of the obtained cathode material reaches 160.52mAh / g; a charge-discharge platform of the cathode material is about 3.5V relative to a lithium electrode potential, the initial discharge capacity exceeds 168mAh / g, and the capacity is attenuated by about 1.2% after 100times of charge-discharge cycles; and compared with a control embodiment, namely undoped LiFePO4, the cathode material is greatly improved in specific capacity and cyclic stability.

The invention discloses a preparation method of titanium and barium activated lithium iron phosphate as a cathode material. The preparation method comprises the steps of: mixing raw materials including a lithium source, a titanium source, a barium source, an iron source and a phosphate source according to the proportion of 1mol:(0.00002-0.00005)mol:(0.0003-0.003)mol:1mol:1mol; then, performing high-speed ball milling at the rotation speed of 200r / minm for 20h in an absolute ethyl alcohol medium; drying at 105-120 DEG C to obtain a precursor; placing the precursor obtained through drying in a high-temperature furnace; and calcinating for 24h at the high temperature of 500-750 DEG C in a pure nitrogen atmosphere to obtain the titanium and barium activated lithium iron phosphate as the cathode material. Because a small amount of substitutive titanium and barium are doped, the shape and the particle size of a product are favorably controlled to obtain a stable lithium iron phosphate compound, of which the crystal lattice is activated, the lithium ion diffusion coefficient is increased, and the initial discharge capacity of the obtained cathode material reaches 160.52mAh / g; a charge-discharge platform of the cathode material is about 3.5V relative to a lithium electrode potential, the initial discharge capacity exceeds 168mAh / g, and the capacity is attenuated by about 1.2% after 100 times of charge-discharge cycles; and compared with a control embodiment, namely undoped LiFePO4, the cathode material is greatly improved in specific capacity and cyclic stability.

The invention relates to a method for preparing a zinc and barium activated lithium iron phosphate cathode material. Raw materials for preparing the zinc and barium activated lithium iron phosphate cathode material include lithium sources, ferrum sources, phosphate radical sources, zinc sources and barium sources, all the raw materials are mixed according to a proportion of 1 mol Li : 0.00002-0.00005 mol Zn : 0.0003-0.003 mol Ba : 1 mol Fe : 1 mol P, performed with ball milling at high speed with rotation speed at 200 r / min in absolute ethyl alcohol media, dried at 105-120 DEG C to obtain a precursor, and the precursor obtained through drying is placed in a high temperature furnace to be roasted for 24 hours at 500-750 DEG C high temperature in nitrogen atmosphere so as to obtain the zinc and barium activated lithium iron phosphate cathode material. Due to the fact that a small amount of doping replaces zinc and barium, control on shape and particle size of products is facilitated, stable lithium iron phosphate compound can be obtained, crystal lattice of the lithium iron phosphate compound is activated, lithium-ion diffusion coefficient is enlarged, and first discharge capacity of obtained materials reaches 160.52 mAh / g. A charge-discharge platform of the zinc and barium activated lithium iron phosphate cathode material is about 3.5 V relative to electric potential of lithium electrodes, first discharge capacity of the charge-discharge platform surpasses 168 mAh / g, and capacity of the charge-discharge platform is reduced to about 1.2% after 100 times of charge-discharge circulation. Compared with a lithium iron phosphate (LiFePO4) comparison embodiment without doping, the zinc and barium activated lithium iron phosphate cathode material is greatly improved in both specific capacity and cycle stability.

The invention discloses a method for preparing an antimony and barium activated lithium iron phosphate cathode material. The method comprises the following steps of: mixing a lithium source, an iron source, a phosphate group source, an antimony source and a barium source which serve as raw materials according to the ratio of Li to Sb to Ba to Fe to P of 1:(0.00002-0.00005):(0.0003-0.003):1:1, performing high-speed ball milling in an absolute ethanol medium at the rotating speed of 200r / min for 20 hours, drying at the temperature of between 105 and 120 DEG C, and thus obtaining a precursor; and putting the dried precursor into a high temperature furnace, calcining in a nitrogen atmosphere at the temperature of between 500 and 750 DEG C for 24 hours, and thus obtaining the antimony and barium activated lithium iron phosphate cathode material. A small amount of antimony and barium is doped, so that control over the appearance and the particle size of a product is facilitated, a stable lithium iron phosphate compound is obtained, the crystal lattice of the material is activated, a lithium ion diffusion coefficient is improved, and the material has the initial discharging capacity of 160.52mAh / g; a charging / discharging platform of the material has a relative lithium electrode potential of about 3.5V, and material has the initial discharging capacity of more than 168mAh / g and has the capacity which is reduced by about 1.2 percent after 100-time charging / discharging operation; and compared with an undoped LiFePO4 comparison embodiment, the method has the advantage that the specific capacity and the circulating stability of the material are greatly improved.

The invention discloses a preparation method for a magnesium / barium-activated lithium iron phosphate cathode material. The preparation method is characterized by comprising the following steps of: mixing raw materials which are a lithium source, an iron source, a phosphate group source, a magnesium source and a barium source in the molar ratio of 1:(0.002-0.005):(0.0003-0.003):1:1, ball-milling the mixture for 20h at the high rotating speed of 200r / mimn in an absolute ethanol medium, drying the mixture at 105 to 120 DEG C to obtain a precursor, arranging the dried precursor in a high-temperature furnace, and sintering the precursor for 24h at the high temperature of 500 to 750 DEG C to obtain the magnesium / barium-activated lithium iron phosphate cathode material. Due to the doping of a small amount of substitutional magnesium / barium, so control over the appearance and grain size of the product is facilitated, a stable lithium iron phosphate compound is obtained, the crystal lattice of the compound is activated, a lithium ion diffusion coefficient is increased and the first discharging capacity of a battery adopting the obtained material reaches 155.52mAh / g. The potential of a charging and discharging platform relative to a lithium electrode is about 3.5V, the initial discharging capacity of the battery exceeds 164mAh / g, and the capacity of the battery is attenuated by about 3.0 percent after 100 charging and discharging cycles. Compared with those of the control embodiment of undoped LiFePO4, the material prepared by the method has the advantages that: specific capacity and cyclical stability are relatively more improved. The cost of barium is a hundred times lower than that of lithium, so production cost can be decreased by over ten times.

The invention discloses a preparation method of bismuth and barium activated lithium iron phosphate as a cathode material. The preparation method comprises the steps of: mixing raw materials including a lithium source, a bismuth source, a barium source, an iron source and a phosphate source according to the proportion of 1mol:(0.00002-0.00005)mol:(0.0003-0.003)mol:1mol:1mol; then, performing high-speed ball milling at the rotation speed of 200r / minm for 20h in an absolute ethyl alcohol medium; drying at 105-120 DEG C to obtain a precursor; placing the precursor obtained through drying in a high-temperature furnace; and calcinating for 24h at the high temperature of 500-750 DEG C in a common pure nitrogen atmosphere to obtain the bismuth and barium activated lithium iron phosphate as the cathode material. Because a small amount of substitutive bismuth and barium are doped, the shape and the particle size of a product are favorably controlled to obtain a stable lithium iron phosphate compound, of which the crystal lattice is activated, the lithium ion diffusion coefficient is increased, and the initial discharge capacity of the obtained cathode material reaches 160.52mAh / g; a charge-discharge platform of the cathode material is about 3.5V relative to a lithium electrode potential, the initial discharge capacity exceeds 168mAh / g, and the capacity is attenuated by about 1.2% after 100 times of charge-discharge cycles; and compared with a control embodiment, namely undoped LiFePO4, the cathode material is greatly improved in specific capacity and cyclic stability.