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Lithium iron phosphate composite anode material in lithium-ion battery and preparation method thereof

A composite positive electrode material and lithium-ion battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as difficult practical application, low lithium ion diffusion rate, and low electronic conductivity

Inactive Publication Date: 2011-06-22
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, LiFePO 4 The significant disadvantage of being a cathode material is the low intrinsic electronic conductivity (10 -8 ~10 -10 S / cm) and lithium ion diffusion rate is small (1.8×10 -14 cm 2 / s), resulting in that the electrons of the material cannot be extracted and intercalated from the electrode with lithium ions in time during the charging and discharging process, resulting in a large capacitive reactance, which seriously affects its electrochemical performance and makes it difficult to be practically applied.

Method used

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  • Lithium iron phosphate composite anode material in lithium-ion battery and preparation method thereof
  • Lithium iron phosphate composite anode material in lithium-ion battery and preparation method thereof
  • Lithium iron phosphate composite anode material in lithium-ion battery and preparation method thereof

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Embodiment 1

[0027] Mix analytically pure lithium carbonate, ferrous oxalate, and ammonium dihydrogen phosphate according to the stoichiometric ratio of 0.5:1:1, then add a small amount of glucose, use absolute ethanol as the medium, wet ball mill for 20 hours, and dry to obtain the precursor. The precursor was placed in a tube furnace, protected by argon, heated to 350°C for 5 hours, then heated to 700°C for 12 hours and then cooled to room temperature with the furnace. Add nickel nanowires with a mass fraction of 0.5wt% to the above product, use ethanol as a dispersant, stir and sonicate to make it evenly mixed, after drying, keep it in a vacuum oven at 200°C for 1 hour to obtain the final product.

[0028] The XRD pattern of the prepared lithium-ion battery cathode material is as follows figure 1 As shown, the SEM image is shown in figure 2 As shown, the EDS diagram is as image 3 shown. It can be seen that the obtained product is olivine-type lithium iron phosphate with a complete ...

Embodiment 2

[0033]Mix analytically pure lithium carbonate, ferrous oxalate, and ammonium dihydrogen phosphate according to the stoichiometric ratio of 0.5:1:1, then add a small amount of sucrose, use absolute ethanol as the medium, wet ball mill for 24 hours, and dry to obtain the precursor. The precursor was placed in a tube furnace, protected by argon, heated to 350°C for 10 hours, then heated to 700°C for 20 hours, and then cooled to room temperature with the furnace. Add aluminum oxide nanowires with a mass fraction of 1 wt% to the above product, then add ethanol as a dispersant, stir vigorously to make it evenly mixed, and after drying, keep warm at 220°C for 1 h in an argon atmosphere to obtain the final product.

Embodiment 3

[0035] Mix analytically pure lithium hydroxide, ferrous oxalate, and ammonium dihydrogen phosphate according to the stoichiometric ratio of 1.05:1:1, then add a small amount of glucose, use absolute ethanol as the medium, wet ball mill for 18 hours, and dry to obtain the precursor. The precursor was placed in a tube furnace, protected by nitrogen, heated to 300°C for 6 hours, then heated to 750°C for 15 hours, and then cooled to room temperature with the furnace. Add nickel oxide nanowires with a mass fraction of 0.3wt% to the above product, then add ethanol as a dispersant, stir vigorously to make it evenly mixed, and after drying, keep warm at 300°C for 30 minutes in a nitrogen atmosphere to obtain the final product.

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Abstract

The invention discloses a lithium iron phosphate composite anode material in a lithium-ion battery and a preparation method thereof, belonging to the technical field of lithium-ion battery material preparation process. The method is characterized in that in a process for preparing lithium iron phosphate, little nano-wire is doped, wherein the doping amount is 0.2 to 5 weight percent of the lithium iron phosphate; and the nano-wire is one or two of metal nano-wires and metal oxide nano-wires. In the method, a raw material precursor containing lithium, iron and phosphor is adopted, and the method comprises the following steps: uniformly mixing the raw material precursor with the nano-wire after ball milling, drying, screening, presintering and calcining; and annealing to prepare a nano-wire composite lithium iron and phosphor composite anode material. The invention has the advantages that the conductive performance and other electrochemical performances of the prepared lithium iron phosphate composite anode material are remarkably improved, so the reversible capacity, the rate performance and the cycle life of the battery are improved.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate composite cathode material in a lithium ion battery, and belongs to the technical field of lithium ion batteries. Background technique [0002] With the increasingly prominent problems of environmental pollution, energy crisis and resource shortage, countries all over the world are paying more and more attention to the development of high-efficiency, clean, renewable energy and related technologies such as electric vehicles, electric bicycles, and portable electric tools. Power batteries are closely related. At present, the power batteries used in electric vehicles are mainly lead-acid batteries and nickel-metal hydride batteries. Now that people have recognized the poisoning of lead, the use of lead-acid batteries has begun to be limited; and the energy density of nickel-metal hydride batteries cannot meet the rapidly developing market demand, so people must re-select and devel...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/1397
CPCY02E60/122Y02E60/12Y02E60/10
Inventor 周益春卢菲潘勇周兆峰
Owner XIANGTAN UNIV
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