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Carbon film and LiFePO4 composite nm conductive material and its synthesis method

A nano-conductive, carbon film technology, applied in conductive materials, conductive materials, conductors, etc., can solve the problems of unavailability, poor electrical conductivity, and high requirements for preparation conditions, and achieve the effect of reducing preparation requirements and energy consumption, and being easy to prepare.

Inactive Publication Date: 2003-09-17
FUDAN UNIV
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Problems solved by technology

The main disadvantage of the above method a is that although the preparation of a single nanoparticle is simple, 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 materials are cheap and easy to obtain, but its main disadvantage is that Conductive carbon materials have been formed, and finally nano LiFePO cannot be obtained 4 material, so it is not suitable for high-current charging and discharging of the material; the material prepared by method c has better electrical conductivity, but the disadvantage is high cost and high requirements for preparation conditions

Method used

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  • Carbon film and LiFePO4 composite nm conductive material and its synthesis method

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Embodiment Construction

[0020] Example 1. Add 2 mL of glycerol dropwise to 10 mL of distilled water, and stir evenly. Add 3.45g LiNO under high speed stirring 3 , 9g FeC 2 o 4 9H 2 O and 5.8 g NH 4 h 2 PO 4 , after stirring for 1 hour, in N 2 Dry at 120°C under atmosphere. then in N 2 Under the atmosphere, the temperature was raised to 600°C, baked for 24 hours, and after natural cooling, a black carbon film and LiFePO 4 Composite nano conductive new material; the carbon film content of the material is 2wt%, and the conductivity is 10 -5 S cm -1 Magnitude.

[0021] Example 2. Add 20mL of glycerol dropwise to 10mL of distilled water and stir evenly. Add 3.45g LiNO under high speed stirring 3 , 9g FeC 2 o 4 9H 2 O and 5.8 g NH 4 h 2 PO 4 , after stirring for 1 hour, in N 2 Dry at 120°C under atmosphere. then in N 2 Under the atmosphere, the temperature was raised to 800 ° C, baked for 12 hours, and after natural cooling, a black carbon film and LiFePO were obtained. 4 Composite n...

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Abstract

A composite nano conductive material of carbon film and LiFePO4 is xC:yLiFePO4, where the value of x is 0.01-0.30 and the value of y is 0.70-0.99. It is prepared by first mixing polylol or sugar as conductive presoma material with raw material of lithium source, iron source and phosphorus source for synthesizing LiFePo4 in water uniformly and then followed with drying and baking.

Description

technical field [0001] The invention relates to the synthesis of carbon film and LiFePO in 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 improve the LiFePO 4 The e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/00H01M4/36
CPCY02E60/10
Inventor 王利军吴浩青
Owner FUDAN UNIV
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