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A kind of vanadium-doped lithium iron phosphate/carbon three-dimensional porous electrode material and preparation method thereof

A lithium iron phosphate, three-dimensional porous technology, applied in the fields of nanomaterials and electrochemistry, to achieve the effects of easy amplification, high discharge capacity, and favorable market promotion

Active Publication Date: 2018-05-29
北京恩耐吉科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nowadays, carbon coating is widely regarded as a relatively economical and convenient method to improve the electronic conductivity of materials, however, LiFePO 4 The ionic conductivity of electrode materials needs to be further improved

Method used

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  • A kind of vanadium-doped lithium iron phosphate/carbon three-dimensional porous electrode material and preparation method thereof
  • A kind of vanadium-doped lithium iron phosphate/carbon three-dimensional porous electrode material and preparation method thereof
  • A kind of vanadium-doped lithium iron phosphate/carbon three-dimensional porous electrode material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Example 1, see Figure 1 to Figure 5 Shown:

[0029] The invention provides a vanadium-doped lithium iron phosphate / carbon three-dimensional porous electrode material and a preparation method thereof, comprising the following steps (see figure 1 ):

[0030] 1) 1.15g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 10mL of distilled water to form a clear solution; 0.4406g of lithium hydroxide monohydrate (LiOH·H 2 O) dissolved in 10 mL of distilled water to form a clear solution; NH 4 h 2 PO 4 The solution was added dropwise with LiOH·H 2 O solution (lithium source and phosphorus source molar ratio is 1.05: 1, and the actual consumption of lithium source is 1.05 times of required reaction amount), obtains white suspension;

[0031] 2) Weigh iron nitrate nonahydrate (FeNO 3 9H 2 (O) 3.434g (the molar ratio of iron source and phosphorus source is 0.85:1) was added to 20mL alcohol and 1mL ethylene glycol mixed solution, stirred evenly at room tempe...

Embodiment 2

[0041] 1) 1.15g ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ) was dissolved in 10 mL of distilled water to form a clear solution; 1.0712 g of lithium acetate dihydrate (CH 3 COOLi·2H 2 O) dissolved in 10 mL of distilled water to form a clear solution; NH 4 h 2 PO 4 The solution was added dropwise to CH 3 COOLi·2H 2 O solution (lithium source and phosphorus source molar ratio is 1.05: 1, and the actual consumption of lithium source is 1.05 times of required reaction amount), obtains white suspension;

[0042] 2) Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 2.298g (the molar ratio of iron source and phosphorus source is 0.85:1) was added to 20mL alcohol and 1mL ethylene glycol mixed solution, stirred evenly at room temperature to obtain a yellow clear and transparent solution; this solution was added dropwise to step 1) In the resulting white suspension, a yellow suspension was obtained;

[0043] 3) 0.117g ammonium metavanadate (NH 4 VO 3 ) and 0.134g oxalic ...

Embodiment 3

[0049] 1) 1.15g ammonium dihydrogen phosphate (NH 4 h 2 PO 4) was dissolved in 10mL distilled water to form a clear solution; 0.7239g lithium nitrate (LiNO 3 ) was dissolved in 10 mL of distilled water to form a clear solution; the NH 4 h 2 PO 4 The solution was added dropwise to CH 3 COOLi·2H 2 O solution (lithium source and phosphorus source molar ratio is 1.05: 1, and the actual consumption of lithium source is 1.05 times of required reaction amount), obtains white suspension;

[0050] 2) Weigh ferric chloride hexahydrate (FeCl 3 ·6H 2 O) 2.298g (the molar ratio of iron source and phosphorus source is 0.85:1) was added to 20mL alcohol and 1mL ethylene glycol mixed solution, stirred evenly at room temperature to obtain a yellow clear and transparent solution; this solution was added dropwise to step 1) In the resulting white suspension, a yellow suspension was obtained;

[0051] 3) 0.117g ammonium metavanadate (NH 4 VO 3 ) and 0.134g oxalic acid (C 2 h 2 o 4 )...

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Abstract

The invention provides a vanadium doped lithium iron phosphate / carbon three-dimensional porous electrode material and a preparation method therefor. Vanadium is doped in the lithium iron phosphate (LiFePO4) material to realize the atomic-scale positive ion doping, and then fine particles, the surfaces of which are coated with uniform carbon layers, are formed; the fine particles are mutually overlapped through three-dimensional carbon nets to form coarse particles, and the chemical formula is LiFe0.85V0.1PO4 / C; the grain diameter of the fine particles is 0.1-0.2 um and the grain diameter of the coarse particles is 5-20 um; and the preparation method adopts a solution method, mainly comprising the preparation of a precursor solution and the preparation of a finished product. The three-dimensional porous material LiFe0.85V0.1PO4 / C can be used as the positive electrode material of lithium ion batteries; and in addition, the preparation method is simple, easy to realize large-scale production, and accords with the green chemistry characteristic.

Description

technical field [0001] The invention relates to the technical field of nanometer materials and electrochemistry, in particular to a vanadium-doped lithium iron phosphate / carbon three-dimensional porous electrode material and a preparation method thereof. Background technique [0002] Since the new century, with the continuous increase of the number of automobiles, the environmental problems caused by the large consumption of fossil energy by automobiles have become more and more serious. In consideration of environmental protection, the country is vigorously developing pure electric vehicles and hybrid vehicles, and has intensively introduced a series of major favorable policies for China's electric vehicles. With the increasingly clear policies related to electric vehicle charging facilities, new energy vehicles will usher in greater opportunities. However, the overall development of electric vehicles puts forward higher requirements for power lithium-ion batteries, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 葛曜闻罗艳珠张昱祥
Owner 北京恩耐吉科技有限公司