Method for preparing composite nano material filled with lithium iron phosphate between graphene layers

A composite nanomaterial, lithium iron phosphate technology, applied in the field of positive electrode materials of lithium ion batteries, can solve the problems of many steps, complicated processes, unreported graphene/lithium iron phosphate composite nanomaterials, etc., achieves good dispersibility, improves The effect of charging and discharging performance and simple preparation process

Inactive Publication Date: 2013-05-08
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantages of this method are: ① there are a little more steps, the process is complicated, and it is difficult to control the uniformity of the product; ② the added organic amine may affect the electrochemical performance of the c

Method used

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  • Method for preparing composite nano material filled with lithium iron phosphate between graphene layers
  • Method for preparing composite nano material filled with lithium iron phosphate between graphene layers
  • Method for preparing composite nano material filled with lithium iron phosphate between graphene layers

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 0.02 g of graphene was added to 20 mL of ethylene glycol, and 0.02 g of tris-sulfopropyl tetradecyl dimethyl betaine was added at the same time, and sonicated at room temperature for 1 h. 0.34855 g of ammonium dihydrogen phosphate and 0.8425 g of ferrous sulfate heptahydrate were weighed and added to the above solution, and then magnetic stirring was continued for 10 min at room temperature. Weigh 0.37764g of lithium hydroxide monohydrate, dissolve it in 15mL of ethylene glycol, add it dropwise to the above solution with a dropper at a rate of 15 drops / min after dissolving, and continue magnetic stirring for 3 hours to obtain the precursor mixture. The precursor mixed solution was ultrasonically stirred for 30 minutes at room temperature, then magnetically stirred at room temperature for 30 minutes, and then the resulting mixed solution was quickly placed in a high-pressure reactor, reacted at 200 ° C for 10 h, cooled at room temperature, filtered, washed, and heated at...

Embodiment 2

[0025] 0.01 g of graphene was added to 20 mL of ethylene glycol, and 0.01 g of tris-sulfopropyl tetradecyl dimethyl betaine was added at the same time, and the mixture was sonicated for 1 h at room temperature. Weighed 0.34855g of ammonium dihydrogen phosphate and 0.8425g of ferrous sulfate heptahydrate were added to the above solution, and then continued to stir at room temperature. Weigh 0.37764g of lithium hydroxide monohydrate, dissolve it in 15mL of ethylene glycol, add dropwise to the above solution with a dropper at a rate of 15 drops / min after dissolving, and continue to stir for 3 hours to obtain the precursor mixture solution. The precursor mixed solution was ultrasonicated for 30 minutes at room temperature and then stirred at room temperature for 30 minutes, then the resulting mixed solution was quickly placed in a high-pressure reactor, reacted at 200 ° C for 10 h, filtered and washed after cooling at room temperature, and vacuumed at 80 ° C Dry in a drying oven ...

Embodiment 3

[0027] Add 0.08 g of graphene into 20 mL of ethylene glycol, and at the same time add 0.08 g of tris-sulfopropyl tetradecyl dimethyl betaine, and sonicate at room temperature for 1 h. Weighed 0.34855g of ammonium dihydrogen phosphate and 0.8425g of ferrous sulfate heptahydrate were added to the above solution, and then continued to stir at room temperature. Weigh 0.37764g of lithium hydroxide monohydrate, dissolve it in 15mL of ethylene glycol, add dropwise to the above solution with a dropper at a rate of 15 drops / min after dissolving, and continue to stir for 3 hours to obtain the precursor mixture solution. The precursor mixed solution was ultrasonicated for 30 minutes at room temperature and then stirred at room temperature for 30 minutes, then the resulting mixed solution was quickly placed in a high-pressure reactor, reacted at 200 ° C for 10 h, filtered and washed after cooling at room temperature, and vacuumed at 80 ° C Dry in a drying oven for 10 hours. Grind the dr...

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Abstract

The invention relates to a method for preparing a composite nano material filled with lithium iron phosphate between graphene layers and belongs to the technical field of anode materials for lithium ion batteries. The method comprises the following steps of: dispersing graphene and a surfactant in ethylene glycol to prepare a suspension, sequentially adding lithium salt, iron salt and phosphate into the suspension according to a molar ratio, and ultrasonically stirring, thereby obtaining a precursor solution; performing a thermal reaction on the precursor solution at the temperature of 150-200 DEG C, washing, filtering, grinding and calcining the precipitate, thereby obtaining the composite nano material filled with lithium iron phosphate between graphene layers. The method has the advantages that the process is simple, the nano lithium iron phosphate particle layer on graphene in the obtained composite material is uniform in distribution, the composite nano material has a sandwich overlapped structure, and according to the composite material, the charging and discharging performance of the lithium ion battery are improved.

Description

technical field [0001] The invention relates to a preparation method of a composite nano material filled with lithium iron phosphate between graphene layers, and belongs to the technical field of cathode materials for lithium ion batteries. Background technique [0002] Lithium iron phosphate material (LiFePO 4 ) are mainly used as cathode materials for various lithium-ion batteries. In 1996 and 1997, research groups in Japan and the United States discovered and reported that lithium iron phosphate materials with an olivine structure can reversibly move in and out of lithium ions, which has attracted great attention and attracted widespread attention. research and rapid development. Compared with traditional lithium ion secondary battery cathode materials, such as layered lithium cobalt oxide and spinel lithium manganese oxide, lithium iron phosphate has the following characteristics: (1) High energy density, its theoretical specific capacity is 170 mAh / g; (2) Long life,...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M4/62
CPCY02E60/12Y02E60/10
Inventor 刘恩佐孙晓然李家俊师春生何春年赵乃勤
Owner TIANJIN UNIV
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