A method for making anode material Li3V2(PO4)3 of lithium ion battery

A lithium ion battery, lithium vanadium phosphate technology, applied in battery electrodes, chemical instruments and methods, circuits, etc., can solve the problems of restricting the large-scale industrialization of lithium vanadium phosphate, poor charging and discharging performance of synthetic materials, and harsh control conditions, etc. Achieve the effect of reducing synthesis cost, short synthesis cycle and low synthesis temperature

Inactive Publication Date: 2008-09-10
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have some inherent disadvantages, such as: high synthesis temperature, long synthesis cycle, harsh control conditions, high cost, and poor charge-discharge performance of synthetic materials, which limit the large-scale industrialization of lithium vanadium phosphate.

Method used

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  • A method for making anode material Li3V2(PO4)3 of lithium ion battery
  • A method for making anode material Li3V2(PO4)3 of lithium ion battery
  • A method for making anode material Li3V2(PO4)3 of lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0018] Use vanadium pentoxide, lithium carbonate, ammonium dihydrogen phosphate and malic acid as raw materials, mix uniformly in a molar ratio of 1:1.5:3:1, and mechanically activate for 0.5 hours; The temperature was kept at 500°C, 560°C, 650°C and 700°C for 12 hours respectively. The obtained material is analyzed by X-ray diffraction as a monoclinic crystal, which is Li 3 V 2 (PO 4 ) 3 Structure. The particle size of the product obtained by SEM is 100-200 nm. The resulting products were assembled into button batteries to measure their charge-discharge specific capacity and cycle performance, and they were charged and discharged at a rate of 0.1C. Their initial discharge capacity and discharge capacity after 50 cycles are shown in Table 1.

[0019] Experimental condition and result of table 1 embodiment 1

[0020]

Embodiment 2

[0022] Using vanadium dioxide, lithium formate, triammonium phosphate and mandelic acid as raw materials, mix them uniformly in a molar ratio of 2:3:3:3, and activate them mechanically for 20 hours; then put them into a tube furnace, and under a hydrogen atmosphere, The temperature was kept at 650°C for 2h, 5h, 8h, and 20 hours, respectively. The obtained material is analyzed by X-ray diffraction as a monoclinic crystal, which is Li 3 V 2 (PO 4 ) 3 Structure. The particle size of the product obtained by SEM is 100-200 nm. The obtained product was assembled into a button battery to measure its charge-discharge specific capacity and cycle performance, and the charge-discharge was carried out at a rate of 0.1C. Their initial discharge capacity and discharge capacity after 50 cycles are shown in the table

[0023] Experimental condition and result of table 2 embodiment 2

[0024]

Embodiment 3

[0026] Using ammonium metavanadate, lithium oxide, diammonium hydrogen phosphate, and oxalic acid as raw materials, mix them uniformly in a molar ratio of 2:1.5:3:4, and mechanically activate them for 8 hours; , the temperature was kept at 550°C for 15 hours. The obtained material is analyzed by X-ray diffraction as a monoclinic crystal, which is Li 3 V 2 (PO 4 ) 3 Structure. The obtained product was assembled into a button battery to measure its charge-discharge specific capacity and cycle performance, and the charge-discharge was carried out at a rate of 0.1C, and the initial discharge capacity was 131.5mAh·g -1 , the discharge capacity after 50 cycles is 130mAh·g -1 .

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Abstract

The invention discloses a preparation method of lithium vanadium phosphate, a material for positive electrode of lithium ion battery. The preparation method of the invention comprises the steps that: high-valent vanadium compound, phosphorus compound and lithium compound are taken as raw materials and mixed according to molar ratio of contained vanadium, phosphorus and lithium is 2:3:3; the mixture is evenly mixed under room temperature and is added with a reducing agent, then mechanical activation is carried out; the molar ratio of the reducing agent and iron compound is controlled within 1:1-10:1; after 0.5-20 hours of activation and under normal temperature and pressure, the reducing agent is adopted to reduce high-valent vanadium compound so as to produce fine particles of amorphous Li3V2(PO4)3 which is then sent into non oxidizing atmosphere to be heated to 500-700 DEG C and calcined for 2-20 hours under constant temperature; then the crystalline state lithium vanadium phosphate powder is obtained. The preparation method of lithium vanadium phosphate adopts the low-temperature method to process the amorphous lithium vanadium phosphate so as to prepare the lithium vanadium phosphate with excellent performance, which greatly reduces energy consumption and cost. The lithium vanadium phosphate prepared by the preparation method of lithium vanadium phosphate has excellent charge / discharge performance.

Description

technical field [0001] The invention relates to a method for preparing lithium vanadium phosphate, a cathode material of a lithium ion battery, in particular to a method for preparing lithium vanadium phosphate, an anode material of a lithium ion battery, by reduction of lithium intercalation at room temperature and low-temperature heat treatment. Background technique [0002] Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) is a new cathode material for lithium-ion batteries. It has a high discharge platform, the average discharge platform is about 4.0V; high charge and discharge capacity, in the voltage range of 3V ~ 5V, the theoretical capacity is 197mAh / g, and the reversible capacity is above 170mAh / g; In the voltage range of 4.5V, the theoretical capacity is 133mAh / g; excellent cycle performance; good safety performance, and low price, it is considered to be one of the most promising cathode materials for lithium-ion batteries in the future, and is expected to be us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/48H01M4/04C01B25/45C01D15/00
CPCY02E60/10
Inventor 李新海郑俊超王志兴郭华军胡启阳彭文杰张云河刘久清
Owner CENT SOUTH UNIV
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