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Nitrogen doping carbon nanometer-tube and LiFePO4 composite nanometer conductive material as well as preparation method thereof

A technology of nitrogen-doped carbon and nano-conduction, which is applied in the direction of electrode manufacturing, chemical instruments and methods, circuits, etc., can solve the problems of poor conductivity, inability to obtain, and unstable structure, etc., and achieve high-current charging and discharging performance. Preparation requirements and energy consumption, the effects of different preparation conditions

Inactive Publication Date: 2008-12-17
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The main disadvantage of the above method (a) is that although a single nano particle is simple to prepare, its electrical conductivity is poor and its structure is unstable, so the charge and discharge stability of the material cannot be guaranteed; the advantage of method (b) is that the raw material is cheap and easy to get, but Its main disadvantage is that the conductive carbon material has been formed, and finally stable nano-LiFePO cannot be obtained. 4 Therefore, it is not suitable for the high-current charging and discharging of the material; the material prepared by method (c) has good electrical conductivity, but the disadvantage is high cost and high requirements for preparation conditions

Method used

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  • Nitrogen doping carbon nanometer-tube and LiFePO4 composite nanometer conductive material as well as preparation method thereof

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Embodiment 1

[0019] LiNO 3 , FeC 2 o 4 2H 2 O and NH 4 h 2 PO 4 Press Li: a 2 Fe:b 2 P molar ratio a 2 =0.93,b 2 =0.93 mixing, get 18.25 grams and add 10 milliliters of distilled water under high-speed stirring, after stirring for 1 hour, in N 2 Dry at 120°C under atmosphere. then in N 2 The atmosphere was heated to 550°C with 2 ml of diethylamine and kept for 12 hours. After natural cooling, black nitrogen-doped carbon nanotubes and LiFePO were obtained. 4 Composite nano conductive new material, composed of a 1 CNx:b 1 LiFePO 4 middle a 1 =0.02,b 1 =0.98; the weight content of this material nitrogen-doped carbon nanotubes is 2% (x in CNx is 0.15), and the electrical conductivity is at 10 -4 S.cm -1 Magnitude.

Embodiment 2

[0021] LiOH, freshly prepared Fe(OH) 2 and NH 4 h 2 PO 4 Press Li: a 2 Fe:b 2 P molar ratio a 2 =1.03,b 2 =1.03 mixing, get 18.25 grams and add 10 milliliters of distilled water under high-speed stirring, after stirring for 1 hour, in N 2 Dry at 120°C under atmosphere. then in N 2 The atmosphere was heated to 950°C with 12 ml of diethylamine and kept for 12 hours. After natural cooling, black nitrogen-doped carbon nanotubes and LiFePO were obtained. 4 Composite nano conductive new material, composed of a 1 CNx:b 1 LiFePO 4 middle a 1 =0.20,b 1 =0.80; the weight content of this material nitrogen-doped carbon nanotubes is 20% (x in CNx is 0.15), and the electrical conductivity is at 10 -1 S.cm -1 Magnitude.

Embodiment 3

[0023] Will Li 2 CO 3 , freshly prepared Fe(OH) with a molar ratio of 1:1 2 with FeC 2 o 4 2H 2 O mixture and NH 4 h 2 PO 4 Press Li: a 2 Fe:b 2 P molar ratio a 2 =1.0,b 2 =1.0 mixed, get 18.25 grams and add 10 milliliters of distilled water under high-speed stirring, after stirring for 1 hour, in N 2 Dry at 120°C under atmosphere. then in N 2 The atmosphere was heated to 700 ° C by passing 5 ml of tripropylamine and kept for 12 hours. After natural cooling, black nitrogen-doped carbon nanotubes and LiFePO were obtained. 4 Composite nano conductive new material, composed of a 1 CNx:b 1 LiFePO 4 middle a 1 =0.05,b 1=0.95; the material nitrogen-doped carbon nanotube weight content is 5% (x in CNx is 0.06), and the conductivity is at 10 -3 S.cm -1 Magnitude.

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Abstract

The invention relates to a nitrogen-doped carbon nano-tube / LiFePO4 composite nano-sized conducting material and the preparation method which comprises the following steps: A) the mass composition of the nitrogen-doped carbon nano-tube / LiFePO4 composite nano-sized conducting material is as follows: a1CNx:b1LiFePO4, wherein the value of a1 is in the range of 0.01-0.20, and the value of b1 is in the range of 0.80-0.99; and B) the preparation method comprises the following steps: mixing lithium sources, iron sources and phosphor sources at the raw material ratio of Li:a2Fe:b2P, wherein a2 is in the range of 0.93-1.03, and b2 is in the range of 0.93-1.03, stirring in the distilled water, then, oven-drying under the protection of inert gases, calcining at 550 DEG C to 950 DEG C in the atmosphere of Ar or N2 while introducing organic amine, allowing reaction for 0.5 to 12 hours to obtain the final nitrogen-doped carbon nanotube / LiFePO4 composite nano-sized conducting material. The nitrogen-doped carbon nano-tube / LiFePO4 composite nano-sized conducting material has the advantages of low cost, good electrical conductivity and high stability of high-current charge / discharge performance.

Description

technical field [0001] The invention relates to the synthesis of nitrogen-doped carbon nanotubes and LiFePO in an aqueous solution system 4 Composite nano conductive material and preparation method thereof. Background technique [0002] Lithium transition metal phosphate (LiMPO 4 Such as LiFePO 4 ) has aroused great interest as a cathode material for lithium-ion batteries. Compared with the currently commonly used LiCoO 2 , LiMn 2 o 4 And other positive electrode materials, because of its high energy density (theoretical capacity up to 170mAh / g), moderate discharge voltage (3.4V), cheap price, environmental friendliness, safety and so on. The only disadvantage is that the conductivity is too low, only 10 at room temperature -9 ~10 -10 S.cm -1 , so it is difficult to fully develop its potential without improving its conductivity. People's growing demand for batteries that can adapt to high-current charging and discharging has prompted researchers to effectively impr...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/48H01M4/04H01B1/06B01J19/00H01M4/62
CPCY02E60/10
Inventor 王利军
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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