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Method for preparing metal Ni, Cu, coated LiFePo4 powder

A powder and coating technology, applied in the field of material science, can solve the problems of low electronic conductivity, low manufacturing cost, low synthesis temperature, etc., and achieve the effect of high material yield, low production cost and low firing temperature

Inactive Publication Date: 2005-08-03
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a metal Ni, Cu coated LiFePO 4 The powder preparation method overcomes the shortcomings of low electronic conductivity and high cost of materials prepared by conventional methods, and is used to prepare low synthesis temperature, controllable synthetic material particles, high purity, good material conductivity, and high mass density. Manufacturing Low cost, synthetic materials suitable for Li-ion battery manufacturing process with surface-modified LiFePO 4 powder

Method used

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  • Method for preparing metal Ni, Cu, coated LiFePo4 powder
  • Method for preparing metal Ni, Cu, coated LiFePo4 powder
  • Method for preparing metal Ni, Cu, coated LiFePo4 powder

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Weigh ferrous oxalate 2 hydrate, lithium carbonate and ammonium dihydrogen phosphate according to the molar ratio. Using absolute ethanol as the grinding medium, it was ball-milled on a planetary mill for 4 hours and then dried at a lower temperature. Grind the dried mixture powder into a porcelain boat, put it into an atmosphere furnace, and keep it at 400°C for 2 hours under the protection of an inert atmosphere or a reducing atmosphere, and then keep it at 550°C for 24 hours to synthesize LiFePO 4 Powder A1, figure 1 It is the XRD pattern of A1.

[0028] Prepare the electroless plating solution containing Cu and Ni ions: prepare the plating solution containing Ni ions according to the following ratio: nickel sulfate hexahydrate 45 g / L, sodium hypophosphite 30 g / L, sodium citrate 60 g / L, acetic acid Ammonium 45 g / L. Adjust the pH value of the mixed liquid to 8 with ammonia water to obtain the plating solution B containing Ni. According to 21 g / L of copper sulfate ...

Embodiment 2

[0031] Weigh ferrous oxalate 2 hydrate, lithium carbonate and ammonium dihydrogen phosphate according to the molar ratio. Using absolute ethanol as the grinding medium, it was ball-milled on a planetary mill for 6 hours and then dried at a lower temperature. Grind the dried mixture powder into a porcelain boat, put it into an atmosphere furnace, and keep it at 400°C for 2 hours under the protection of an inert atmosphere or a reducing atmosphere, and then keep it at 850°C for 8 hours to synthesize LiFePO 4 Powder A2.

[0032] The method for preparing the electroless plating solution containing Cu and Ni ions is the same as embodiment 1.

[0033] Measure SnCl 2 Put 30 ml of aqueous solution into a beaker, add 24 grams of prefabricated powder A, stir vigorously for 2 minutes, separate the solid and liquid by suction filtration, and wash twice. The filter cake was placed in a solution of 20 ml of palladium chloride, the solid and liquid were separated after vigorous stirring f...

Embodiment 3

[0035] Weigh ferrous oxalate 2 hydrate, lithium carbonate and ammonium dihydrogen phosphate according to the molar ratio. Using absolute ethanol as the grinding medium, it was ball-milled on a planetary mill for 6 hours and then dried at a lower temperature. Grind the dried mixture powder into a porcelain boat, put it into an atmosphere furnace, and keep it at 400°C for 6 hours under the protection of an inert atmosphere or a reducing atmosphere, and then keep it at 650°C for 10 hours to synthesize LiFePO 4 Powder A3.

[0036] The method for preparing the electroless plating solution containing Cu and Ni ions is the same as embodiment 1.

[0037] Measure SnCl 2 Put 20 ml of aqueous solution into a beaker, add 34 grams of prefabricated powder A, stir vigorously for 2 minutes, separate the solid and liquid by suction filtration, and wash twice. The filter cake was placed in a solution of 25 ml of palladium chloride, the solid and liquid were separated after vigorous stirring ...

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Abstract

A preparing method for LiFePO4 powder covered by Ni and Cu includes preparing LiFePO4 powder with uniform diameters, preparing a chemical coating liquid C with Cu, putting powder A in SnCl2 water solution, mixing, filtering and washing, after that, the filtered cake is put into PdCl solution, mixing, filtering and washing to put the solid one into the coating solution B and C to be coated, filtered and washed, the power is processed in inert or recovered atmosphere to get the black LiFePO4 powder covered by the metal.

Description

technical field [0001] The invention relates to a common secondary lithium ion battery or power energy battery positive electrode material LiFePO 4 The invention relates to a process method for surface modification of powder with metal Ni and Cu, which belongs to the field of material science. Background technique [0002] LiFePO 4 The material has the characteristics of cheap, non-toxic, non-hygroscopic, good environmental compatibility, rich mineral resources, high capacity (theoretical capacity is 170mAh / g, energy density is 550Wh / Kg), and good stability. It is one of the most potential alternative materials for cathode materials. Due to its poor electronic conductivity, it greatly limits the application of materials at higher current densities. Currently, there are mainly two methods for surface modification of materials: [0003] 1) Carbon black coating; Huang, H., S.C.Yin, and L.F.Nazar, Approaching theoretical capacity of LiFePO4 at room temperature at high rates. ...

Claims

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Application Information

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IPC IPC(8): B22F9/00C01B25/00C01D15/00C01G1/02C01G49/00H01M4/04
CPCY02E60/12Y02E60/10
Inventor 唐子龙卢俊彪张中太罗绍华沈万慈
Owner TSINGHUA UNIV
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