High-performance lithium ion phosphate materials prepared by microwave method and preparation method of high-performance lithium ion phosphate materials

A lithium iron phosphate, high-performance technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as high external temperature, achieve strong practicability, excellent rate performance, and remarkable effects

Inactive Publication Date: 2012-03-21
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process, it takes a certain amount of time to make the central part reach the required temperature, and at the same time requires a higher external temperature; the time required for objects with poor thermal conductivity is longer.

Method used

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  • High-performance lithium ion phosphate materials prepared by microwave method and preparation method of high-performance lithium ion phosphate materials
  • High-performance lithium ion phosphate materials prepared by microwave method and preparation method of high-performance lithium ion phosphate materials
  • High-performance lithium ion phosphate materials prepared by microwave method and preparation method of high-performance lithium ion phosphate materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 (comparative test)

[0046] Select ferric oxide, lithium hydroxide and ammonium dihydrogen phosphate as raw materials, weigh them according to the ratio of molar ratio Fe: Li: P = 1: 1.02: 1, and place them in an aqueous solution so that the solid content reaches 40%. After mixing for 7 hours until uniform, spray-dried, then placed in a resistance heating furnace, heat-treated at 350°C for 2h under the protection of argon, then heat-treated at 650°C for 1h and then cooled to room temperature to obtain the desired lithium iron phosphate material .

[0047] The XRD of the obtained material is shown in figure 1 a, it can be seen that the material is pure phase LiFePO 4 .

[0048] Electrochemical tests showed that ( figure 2 a), the capacity of the material is 101mAh / g when charged and discharged at 5C, and the conductivity of the material is 2X10 -6 S / cm.

Embodiment 2

[0050] Select ferric oxide, lithium hydroxide and ammonium dihydrogen phosphate as raw materials, weigh them according to the ratio of molar ratio Fe: Li: P = 1: 1.02: 1, and place them in an aqueous solution so that the solid content reaches 40%. After mixing for 7 hours until uniform, spray-dried, then placed in a microwave heating furnace (where ferric oxide is the main microwave absorber), heat-treated at 350°C for 2h under the protection of argon, then heat-treated at 650°C for 1h and then cooled to room temperature to obtain the desired lithium iron phosphate material.

[0051] The XRD of the obtained material is shown in figure 1 b, it can be seen that the material is pure phase LiFePO 4 .

[0052] Electrochemical tests showed that ( figure 2 b), the capacity of the material is 144mAh / g when charged and discharged at 5C, and the conductivity of the material is 3.8X10 -5 S / cm.

Embodiment 3

[0054] Select ferrous oxalate, lithium nitrate and ammonium dihydrogen phosphate raw materials, weigh them according to the ratio of molar ratio Fe: Li: P = 1: 1.02: 1, place them in acetone solution, make the solid content reach 40%, and then add the above raw materials Mass 1% Co 3 o 4 , mixed in a high-energy ball mill for 7 hours until uniform, spray-dried, and then placed in a microwave oven (where Co 3 o 4 is the main microwave absorber), heat treatment at 350°C for 2h under the protection of argon, then heat treatment at 650°C for 2h and then cool to room temperature to obtain the desired lithium iron phosphate material.

[0055] The resulting material is pure phase LiFePO 4 . Electrochemical tests show that when charging and discharging at 5C, the capacity of the material is 150mAh / g, and the conductivity of the material is 5.1X10 -4 S / cm.

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Abstract

The invention discloses high-performance lithium ion phosphate materials prepared by a microwave method and a preparation method of the high-performance lithium ion phosphate materials. Under the condition of microwave heating, microwave absorption is added into a precursor to prepare the high-performance lithium ion phosphate materials, the microwave absorption can be used as a heat source during heating, and a lithium ion phosphate end product can be used as a doping substance or a complex. The microwave absorption is divided into a magnetic material and a polarity material, includes the magnetic materials comprising transition elements and rare earth elements, and also includes polarity compounds such as non-face-centered cubic-structure compounds, non-polarity carbonaceous organic materials, metal organic compounds and the like. When the lithium ion phosphate materials are prepared by the method, heat treatment time can be shortened, heat utilization efficiency is improved, the materials have higher electric conductivity and electrochemical performance, and comprehensive performance indexes of the high-performance lithium ion phosphate materials are higher than materials prepared by means of resistance type heating and in an inert atmosphere protection environment under equal conditions. The preparation method is simple and convenient in operation and easy for massive production.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and specifically relates to selecting a suitable microwave absorber under microwave selective heating conditions. The absorber can be used as a microwave absorbing material during heating to improve heating efficiency; it can also be used as a part of the final product Improve the electrochemical performance of lithium iron phosphate materials. Background technique [0002] One of the key technologies related to electric vehicles and electric tools is energy storage technology. At present, the energy storage technology with commercial value and excellent comprehensive performance is the power lithium battery technology. Due to its high price, low specific capacity and strict performance requirements, the cathode material has become a bottleneck restricting the large-scale application of lithium-ion batteries. At present, more mature lithium battery products on the market mostly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45
Inventor 刘兆平唐长林张建刚马池姚霞银周旭峰
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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