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Lithium ion battery composite anode material LiFePO4-Li3V2(PO4)3/C and method for making same

A composite cathode material, lithium-ion battery technology, applied in battery electrodes, electrode manufacturing, chemical instruments and methods, etc., can solve problems such as restricting commercialization, low conductivity, etc., and achieve improved conductivity, high conductivity, and environmentally friendly prices. Effect

Inactive Publication Date: 2008-01-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polyanionic material LiFePO 4 It is very likely to become a commercially viable next-generation cathode material for lithium-ion batteries because of its high capacity, good thermal stability, low price, and environmental protection. However, its low electrical conductivity has become a bottleneck restricting its commercialization. How to solve it This problem has become a research hotspot of many research groups in the world.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] According to the LiFePO in the obtained product 4 with Li 3 V 2 (PO 4 ) 3 The molar ratio takes the required amount of LiOH·H 2 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 .According to 444g / [molLiFePO 4 -Li 3 V 2 (PO 4 ) 3 The ratio of / C] takes the required amount of polyethylene glycol (PEG), and the taken LiOH·H 2 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 Mix it with PEG evenly, add water and adjust it into a rheological phase to form a rheological phase precursor, and then roast the obtained rheological phase precursor in an argon atmosphere at a temperature of 700 ° C for 6 hours to obtain LiFePO 4 with Li 3 V 2 (PO 4 ) 3 A series of composite compounds LiFePO with molar ratios of 1:1, 2:1, 4:1, 8:1, 16:1 4 -Li 3 V 2 (PO 4 ) 3 / C.

[0018] In addition, the ratio of the amount of substances is 1:1 to take LiOH·H 2 O and FePO 4 4H 2 O, according to 444g / [molLiFePO 4 / C] to take PEG, the taken LiOH·H 2 O, FePO 4 4H 2 After O and PE...

Embodiment 2

[0022] According to the LiFePO in the obtained product 4 with Li 3 V 2 (PO 4 ) 3 The molar ratio of 8:1 takes the required amount of LiOH·H 2 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 , according to 444g / molLiFePO 4 -Li 3 V 2 (PO 4 ) 3 The ratio of / C takes the required amount of polyethylene glycol (PEG), and the taken LiOH·H 2 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 After mixing with PEG evenly, add water to adjust the rheological phase to form a rheological phase precursor, and then divide the obtained rheological phase precursor into three parts, and roast them in a nitrogen atmosphere at 600, 700, and 800 ° C for 6 hours to obtain three types The target product LiFePO produced at different temperatures 4 -Li 3 V 2 (PO 4 ) 3 / C.

[0023] From the XRD diffraction pattern, it can be proved that LiFePO with good crystallization can be obtained at temperatures of 600, 700, and 800 °C. 4 -Li 3 V 2 (PO 4 ) 3 / C product, where LiFePO 4 with Li...

Embodiment 3

[0027] According to the LiFePO in the obtained product 4 with Li 3 V 2 (PO 4 ) 3 The molar ratio of (LiFePO 4 / Li 3 V 2 (PO 4 ) 3 =1 / x, 02 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 , respectively according to 25, 100, 350, 600g / [molLiFePO 4 -Li 3 V 2 (PO 4 ) 3 The ratio of / C] takes the required amount of polyethylene glycol (PEG), and the taken LiOH·H 2 O, FePO 4 4H 2 O, V 2 o 5 , NH 4 h 2 PO 4 After mixing with PEG evenly, add water to adjust the rheological phase to form a rheological phase precursor, and then roast the rheological phase precursor in an argon atmosphere at a temperature of 700 ° C for 6 hours to obtain LiFePO 4 with Li 3 V 2 (PO 4 ) 3 LiFePO with a molar ratio of 8:1 4 -Li 3 V 2 (PO 4 ) 3 / C.

[0028] The resulting product was tested by XRD, and the results were different from those of standard LiFePO 4 and Li 3 V 2 (PO 4 ) 3 In contrast, the resulting product has both LiFePO 4 and Li 3 V 2 (PO 4 ) 3 crystal fo...

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Abstract

The invention discloses a composite anode material LiFePO4-Li3V2(PO4)3 / C for lithium ion batteries and a preparation method for the composite anode material, wherein, the LiFePO4 and the Li3V2(PO4)3 of the complex chemical compound LiFePO4-Li3V2(PO4)3 / C are stoichiometrie compounds; the substance quantity ratio of the LiFePO4 and the Li3V2(PO4)3 is that LiFePO4 / Li3V2(PO4)3 is equal to an 1 / x, and the x is more than zero and less than or equal to 1; the LiOH®qH2O, Li2CO3 or CH3COOLi®q2H2O is mixed uniformly with FePO4, 4H2O,V2O5, NH4H2PO4 and the polyethylene glycol to be blended to be the rheological phase after being added with water, and an obtained rheological phase precursor is roasted in the inert atmosphere for three to twenty hours under the temperature of 600-800 DEG C, which produces the composite anode material LiFePO4-Li3V2 (PO4)3 / C for lithium ion batteries. The prepared composite anode material for lithium ion batteries has the advantages of large capacity, high efficiency of charge-discharge, good cycle efficiency, good high-rate performance, which is suitable for industrial production.

Description

technical field [0001] The invention relates to a lithium-ion battery composite cathode material LiFePO 4 -Li 3 V 2 (PO 4 ) 3 / C and a preparation method thereof belong to the technical field of batteries. Background technique [0002] The cathode material of lithium-ion batteries plays a key role in the performance and safety of lithium-ion batteries. As a positive electrode material for lithium-ion batteries with good performance, it is required to have low cost, good stability, environmental friendliness, high capacity and high working voltage. The current commercialized finished lithium-ion battery cathode material is LiCoO 2 Mainly, but its capacity is relatively low, because its actual capacity is only 50% to 60% of the theoretical capacity. Polyanionic material LiFePO 4 It is very likely to become a commercially viable next-generation cathode material for lithium-ion batteries because of its high capacity, good thermal stability, low price, and environmental p...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45
CPCY02E60/12Y02E60/10
Inventor 张克立王丽娜
Owner WUHAN UNIV
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