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Nano cage-shaped LiVPO4F battery material and preparation method thereof

A battery material and nano-cage technology, applied in the field of nano-cage LiVPO4F battery material and its preparation, can solve the problems of low electrical conductivity, restricted specific capacity, rate performance and cycle stability, limited modification effect, etc., and achieve high electrical conductivity. , stable and reliable cycle performance, high energy effect

Pending Publication Date: 2020-06-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, polyanionic LiVPO 4 The conductivity of F is very low, which seriously restricts its actual specific capacity, rate performance and cycle stability.
At present, researchers generally use bulk doping and surface coating methods to improve their battery performance, but the modification effect is still limited.
On the other hand, although nanotechnology has been widely used in the manufacture of other battery materials [Nature Nanotechnology, 2016, 11(12), 1031-1038.], so far, there are few reports on the use of advanced and effective nanostructures for LiVPO 4 F for scientific design and efficient preparation of modification

Method used

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  • Nano cage-shaped LiVPO4F battery material and preparation method thereof
  • Nano cage-shaped LiVPO4F battery material and preparation method thereof
  • Nano cage-shaped LiVPO4F battery material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A kind of nano-cage LiVPO of the present embodiment 4 F battery material, its morphology structure is:

[0032] nano cage

[0033] A kind of nano-cage LiVPO of the present embodiment 4 The preparation method of F battery material, comprises the following steps:

[0034] 1. Mix the vanadium source, phosphorus source and additive A according to the molar ratio of 1:1:0.8, sand mill at 300rpm for 2 hours, adjust the mass concentration to 25% with water, and carry out spray drying treatment at a temperature of 100°C and a pressure of 40Mpa.

[0035] 2. The obtained powder was sintered in a protective atmosphere at 750°C for 4 hours.

[0036] 3. Add lithium source, fluorine source and additive B to the product of step 2 according to the molar ratio of 1:1:1:0.25, mix evenly, and dry.

[0037] 4. Sinter in a protective atmosphere at 700°C for 0.5h, pulverize and grind to obtain the target material powder LiVPO 4 F.

[0038] The vanadium source is NH 4 VO 3 and VOF 3 ...

Embodiment 2

[0047] A kind of nano-cage LiVPO of the present embodiment 4 F battery material, its morphology structure is:

[0048] nano cage

[0049] A kind of nano-cage LiVPO of the present embodiment 4 The preparation method of F battery material, comprises the following steps:

[0050] 1. Mix the vanadium source, phosphorus source and additive A according to the molar ratio of 1:1:0.5, sand mill at 200rpm for 3h, adjust the mass concentration to 30% with water, carry out spray drying treatment at a temperature of 80°C and a pressure of 50Mpa.

[0051] 2. The obtained powder was sintered in a protective atmosphere at 750°C for 2 hours.

[0052] 3. Add lithium source, fluorine source and additive B to the product of step 2 according to the molar ratio of 1:1.2:1:0.2, mix evenly, and dry.

[0053] 4. Sinter in a protective atmosphere at 650°C for 1h, crush and grind to obtain the target material powder LiVPO 4 F.

[0054] The vanadium source is V 2 o 5 .

[0055] The phosphorus s...

Embodiment 3

[0064] A kind of nano-cage LiVPO of the present embodiment 4 F battery material, its morphology structure is:

[0065] Nano ball cage shape.

[0066] A kind of nano-cage LiVPO of the present embodiment 4 The preparation method of F battery material, comprises the following steps:

[0067] 1. Mix the vanadium source, phosphorus source and additive A according to the molar ratio of 0.98:0.99:1, sand mill at 300rpm for 1.5h, adjust the mass concentration to 35% with water, carry out spray drying treatment at a temperature of 120°C and a pressure of 30Mpa.

[0068] 2. The obtained powder was sintered in a protective atmosphere at 700°C for 4 hours.

[0069] 3. Add lithium source, fluorine source and additive B to the product of step 2 according to the molar ratio of 1:1.1:1.2:0.3, mix evenly, and dry.

[0070] 4. Sinter at 650°C for 0.8h in a protective atmosphere, crush and grind to obtain the target material powder LiVPO 4 F.

[0071] The vanadium source is V 2 o 5 and N...

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Abstract

The invention discloses a nano cage-shaped LiVPO4F battery material and a preparation method thereof. The nano cage-shaped LiVPO4F battery material is of a nanometer ball-cage-like structure. And thepreparation method comprises the following steps that: 1, mixing a vanadium source, a phosphorus source and an additive A , and sanding for 1-6 h at the rotating speed of 100-500 rpm, adjusting the mixture into a solution with the mass concentration of 10-70% with water, and carrying out spray drying treatment at the temperature of 50-200 DEG C and the pressure of 20-200 MPa; 2, sintering the obtained powder in a protective atmosphere at the temperature of 500-900 DEG C for 0.5-8 h; 3, adding a lithium source, a fluorine source and an additive B into the product obtained in the step 2 according to a molar ratio of 1:(0.9-1.5):(0.9-1.5):(0.01-1), uniformly mixing, and drying; and 4, sintering for 0.1-4 h in a protective atmosphere at the temperature of 500-900 DEG C, crushing and grinding to obtain the target material powder LiVPO4F. The method is simple in process, simple and convenient to operate and easy for large-scale production, greatly accelerates the industrial production and application of LiVPO4F in the field of lithium batteries, particularly power lithium batteries, promotes the manufacturing and development of high-safety and high-performance rechargeable lithium batteries, and promotes the wide and deep application of LiVPO4F in the fields of electronic equipment, electric automobiles, power station energy storage and the like.

Description

technical field [0001] The invention relates to a novel manufacturing method of lithium battery cathode materials, in particular to a nano-cage LiVPO 4 F battery material and its preparation method. Background technique [0002] Facing the world's increasingly scarce energy crisis and increasingly severe environmental pollution, rechargeable lithium batteries have shown great technical potential and broad market prospects in the field of efficient and environmentally friendly energy storage. Compared with other electric energy storage devices such as capacitors, lead-acid batteries and fuel cells, rechargeable lithium batteries have high energy density, fast charging and discharging speed, long cycle life, high energy conversion efficiency, good safety, wide operating temperature range, and self-sufficiency. With the advantages of low discharge rate and cheap price, it has broad application prospects in portable electronic equipment, electric tools, electric transportation ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/455H01M4/58H01M10/0525B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B25/455C01P2002/72C01P2004/03C01P2004/32C01P2004/61C01P2006/40H01M4/5825H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 孙孝飞胡琼丹岐琳梅雪松
Owner XI AN JIAOTONG UNIV
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