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Anode material made of doped lithium-iron phosphate active material and carbon and method for producing the same

A technology of active material and positive electrode material, applied in the field of positive electrode material and preparation of doped lithium iron phosphate active material and carbon, can solve the problems of limiting lithium ion extraction and intercalation, instability and the like

Active Publication Date: 2008-07-02
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Fe 4+ Relatively unstable, which limits the extraction and intercalation of lithium ions, so LiFeO 2 Not an ideal active material for battery cathode materials

Method used

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  • Anode material made of doped lithium-iron phosphate active material and carbon and method for producing the same

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0029] Choose Li 2 CO 3 、FePO 4 2H 2 O, NH 4 h 2 PO 4 and P25-TiO 2 powder (purity respectively 99.5%, 99%, 99%, 99%) was weighed, ground and mixed according to the molar ratio of 3:3.6:2.4:0.4, and the powder was loaded into an alumina crucible, at 400°C to 450°C Carry out solid-phase reaction, the reaction time is 4 hours, then grind the powder obtained after heating and pre-decomposition into an alumina crucible, carry out the second solid-phase reaction, and then carry out solid-phase reaction at 850 ° C, the reaction The time was 20 hours, and finally cooled naturally to room temperature to obtain Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Powder. The prepared Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Mixed with acetylene black through planetary ball mill to obtain Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 / C cathode material (mass ratio of active material to acetylene black is 95:5). Use Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 The process of assembling the / C cathode material into a battery is...

Embodiment approach 2

[0032] Choose LiOH·H 2 O, Fe(NO 3 ) 3· 9H 2 O, NH 4 h 2 PO 4 and P25-TiO 2 (the purity is respectively 99%, 98%, 99%, 99%) weighing and dissolving raw materials in deionized water according to the molar ratio of 6: 3.6: 2.4: 0.4, and stirring evenly with a magnetic stirrer; Put it into a high-pressure reactor and react at 170°C for 20 hours to obtain Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Cathode material. Then the prepared Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Mixed with acetylene black through planetary ball mill to obtain Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 / C (the mass ratio of active material and acetylene black is 95:5).

[0033] The performance test results are basically the same as those of Embodiment 1, and the specific capacity achieved by charging and discharging at the same rate is slightly lower than that of Embodiment 1.

Embodiment approach 3

[0035] Choose LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, NH 4 h 2 PO 4 and Ti(OCH 3 ) 4 (the purity is 99%, 98%, 99%, 99.5% respectively) according to the molar ratio of 6: 3.6: 2.4: 0.4 weighing carries out batching. Dissolve the raw materials prepared according to the chemical composition ratio in deionized water, then add citric acid into the solution, then stir continuously under the magnetic stirrer, and finally use NH 3 ·H 2 O to adjust the pH to 3 and stir for about 6 hours to form a sol. Then heat the aqueous solution forming the sol at 120°C for 10h, evaporate the solvent until the gel is formed, and then pretreat the formed gel at 450°C for 5h, then grind the obtained powder, and then heat it at 750°C Heating for 15h, and finally cooling naturally to room temperature to obtain the positive electrode material Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Powder. Then the prepared Li 3 Fe 1.8 Ti 0.2 (PO 4 ) 3 Mixed with acetylene black through planetary ball mill to obtain Li...

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Abstract

The invention relates to an anode material composed by doping phosphate iron and lithium active substance and carbon and used for the secondary lithium battery and a manufacturing method thereof. The invention is characterized in that the general expression of the active substance is Li<3+Y>Fe<2-X>Mex(PO4)3(Me = Ti, Sc, Ge, Al, Zr, Mn, Hf, Nb, Ta, Mo, W, Ru, Ag, Sn, and Pb, etc.); the characteristic in preparation is that the raw material is synthesized into the crystal state of Li<3+Y>Fe<2-X>Mex(PO4)3 through a solid reaction, an hydrothermal method and a sol-gel method in a proper proportion. Then the prepared powder and the carbon is grinded and mixed through a planetary ball mill to obtain the anode material Li<3+Y>Fe<2-X>Mex(PO4)3 / C The specific capacity of the anode material can be up to 122mAhg<-1> (charging and discharging at the rate of C / 20) and 100mAhg<-1> (charging and discharging at the rate of C / 2); furthermore, the material has a good circulation performance and retentivity of specific capacity, thus providing a favorable anode material for the practicality of the secondary lithium ion battery.

Description

technical field [0001] The present invention relates to a solid positive electrode material that can be used for a secondary lithium battery and a preparation method, more precisely, the present invention relates to a positive electrode material composed of doped lithium iron phosphate active material and carbon and its preparation for a secondary lithium battery method. The invention belongs to the field of cathode materials for lithium batteries. Background technique [0002] At present, as a high-performance secondary green battery, lithium-ion batteries have been widely used in various portable electronic products and communication tools. As of 2002, the total output of lithium-ion secondary batteries was 862 million. According to market research, the demand for lithium-ion batteries in 2005 was about 1.2 billion, and in 2010 it could reach about 1.35 billion. Therefore, the research on new battery materials, especially positive electrode materials, is crucial. [00...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/04C01B25/45B22F9/00H01M4/583H01M4/62
CPCY02E60/10
Inventor 黄富强孙军康王耀明刘战强
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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