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Applications of boron-doped lithium vanadium phosphate positive electrode material in lithium ion battery

A lithium-ion battery and lithium vanadium phosphate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as low conductivity, poor high-current discharge performance, and poor high-voltage cycle stability, and achieve simple modification methods , the effect is obvious, and the effect is easy to operate

Pending Publication Date: 2017-03-29
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, lithium vanadium phosphate has the following disadvantages that hinder its practical application: (1) V in the synthesis 3+ easily oxidized to V 5+ It is not easy to obtain single-phase Li 3 V 2 (PO 4 ) 3 ; (2) lithium ion in Li 3 V 2 (PO 4 ) 3 Difficulty in diffusion leads to low utilization of active materials; (3) Li 3 V 2 (PO 4 ) 3 Its own low conductivity leads to poor high-current discharge performance; (4) Poor high-voltage cycle stability

Method used

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  • Applications of boron-doped lithium vanadium phosphate positive electrode material in lithium ion battery
  • Applications of boron-doped lithium vanadium phosphate positive electrode material in lithium ion battery

Examples

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Embodiment 1

[0019] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80°C until it turns into a blue solution, then add 0.00299mol of ammonium dihydrogen phosphate , 0.00001mol of boric acid, 0.0015mol of lithium carbonate, and continue to stir to form blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- =3:2:0.01:2.99). The sol was baked in an oven at 80°C for about 10 hours to obtain a blue fluffy precursor, which was ground into powder and placed in a tube furnace, and heated at a rate of 3°C / min to 350°C and keep it warm for 4h, after cooling down, take it out and grind it, continue to raise the temperature to 750°C at a rate of 3°C / min and keep it warm for 10h, to get a lithium vanadium phosphate composite powder doped with 1% boron.

Embodiment 2

[0021] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80°C until it turns into a blue solution, then add 0.00297mol of ammonium dihydrogen phosphate , 0.00003mol of boric acid, 0.0015mol of lithium carbonate, and continue to stir to form blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- =3:2:0.03:2.97). Place the sol in an oven at 80°C and bake for about 10 hours to obtain a blue fluffy precursor. Grind the precursor into powder and place it in a tube furnace. Under an argon atmosphere, heat up at a rate of 3°C / min. Heat it to 350°C and hold it for 4 hours, take it out and grind it after cooling down, continue to heat up to 750°C at a heating rate of 3°C / min and hold it for 10 hours to obtain a lithium vanadium phosphate composite material powder doped with 3% boron.

Embodiment 3

[0023] Dissolve 0.003mol of oxalic acid in a beaker filled with deionized water, then add 0.001mol of vanadium pentoxide, stir in a constant temperature water bath at 70-80°C until it turns into a blue solution, then add 0.00295mol of ammonium dihydrogen phosphate , 0.00005mol of boric acid, 0.0015mol of lithium carbonate, and continue to stir to form blue-green doped lithium vanadium phosphate sol (Li:V:B:PO 4 3- =3:2:0.05:2.95). Place the sol in an oven at 80°C and bake for about 10 hours to obtain a blue fluffy precursor. Grind the precursor into powder and place it in a tube furnace. Under an argon atmosphere, heat up at a rate of 3°C / min. Heat it to 350°C and hold it for 4 hours. After cooling down, take it out and grind it. Continue to heat up to 750°C at a heating rate of 3°C / min and hold it for 10 hours to reach the lithium vanadium phosphate composite material powder doped with 5% boron.

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Abstract

The present invention relates to applications of a boron-doped lithium vanadium phosphate positive electrode material in a lithium ion battery, wherein the composition of the positive electrode material is Li3V2-xBx(PO4)3 / C (x is more than or equal to 0.01 and is less than or equal to 0.15). According to the present invention, the radius of the boron atom in the positive electrode material is larger than the radius of the vanadium, such that the lithium ion transportation channel can be expanded after the boron is doped so as to promote the ion diffusion; the electrical conductivity and the ionic conductivity of the boron-doped lithium vanadium phosphate positive electrode material are substantially improved compared to the boron-free lithium vanadium phosphate positive electrode material; and the primary discharge specific capacity, the cycle performance and the rate performance of the boron-doped lithium vanadium phosphate positive electrode material as the lithium ion positive electrode material are substantially improved.

Description

technical field [0001] The invention relates to the application of a boron-doped lithium vanadium phosphate cathode material in a lithium ion battery, and belongs to the fields of chemical power source materials and lithium ion batteries. Background technique [0002] Lithium-ion batteries have the advantages of high specific energy, small self-discharge coefficient, long cycle life, light weight and environmental friendliness, and become a strong competitor for electric vehicles and hybrid vehicles. Common power lithium-ion cathode materials include spinel lithium manganese oxide, lithium cobalt oxide and polyanion cathode materials (LiMPO 4 , M=Mn, Fe, V, etc.). Among them, polyanionic lithium iron phosphate (LiFePO 4 ) has long cycle life, high safety, and low price, but has defects such as poor electronic ion conductivity, low diffusion coefficient of lithium ions, and poor high-current discharge characteristics. Lithium vanadium phosphate (Li 3 V 2 (PO 4 ) 3 ) th...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/362H01M4/5825H01M10/0525Y02E60/10
Inventor 冯凯张华民程意张洪章李先锋
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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