Method for preparing high-power and long-service-life lithium iron phosphate anode material

A technology of lithium iron phosphate and positive electrode materials, which is applied in the direction of battery electrodes, electrical components, electrochemical generators, etc., can solve the problems of poor rate performance, poor cycle performance, and low free radical polymer capacity of lithium iron phosphate, and achieve improved Rate performance, high charge storage density, and the effect of promoting the transfer of carbon layers

Inactive Publication Date: 2016-05-18
JIANGSU LENENG BATTERY INC
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  • Abstract
  • Description
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Problems solved by technology

[0005] In view of the current poor rate performance of lithium iron phosphate and its low free radical polymer capacity and poor cycle performance, the purpose of the present invention is to provide a method for preparing a high rate, long-life lithium iron phosphate cathode material, that is, relying on lithium iron phosphate The advantages of good cycle performance and high rate performance of free radical polymers, and the synergistic effect between them, improve the overall performance of lithium iron phosphate batteries

Method used

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  • Method for preparing high-power and long-service-life lithium iron phosphate anode material
  • Method for preparing high-power and long-service-life lithium iron phosphate anode material

Examples

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Embodiment 1

[0019] Embodiment 1: setting free radical monomer: conductive agent: dopant: oxidizing agent: solvent = (1-10g): (1-10g): (1-5ml): (1-20ml): 100ml.

[0020] 1. Preparation of free radical mixed solution: weigh 5g of s-trimethylaniline monomer and dissolve in 100ml of CHCl 3 In the solvent, after stirring evenly, add 5g of carbon nanotubes, 3ml of HCl dopant, and 10ml of 0.1mol / L FeCl 3 oxidizing agent, and the polymerization reaction occurs at a temperature of 80°C to prepare a free radical polymer composite solution;

[0021] 2. Weigh 10.3gLiH at the same time 2 PO 4 and 36.9gFe(NO3) 3 9H 2 O is dissolved in 200mL of N,N-dimethylformamide solvent, stirred to obtain a lithium iron phosphate precursor solution, and then dried to obtain a lithium iron phosphate precursor;

[0022] 3. Weigh 15g of sucrose and mix with 40g of lithium iron phosphate precursor evenly, and heat up to 800°C at a heating rate of 5.0°C / min, keep it warm in the air atmosphere for 3 hours, cool to 15...

Embodiment 2

[0024] 1. Preparation of free radical mixed solution: weigh 1g triarylamine monomer and dissolve in 100ml CHCl 4 In the solvent, after stirring evenly, add 1g graphene, 1mlHClO 4 Dopant, 1ml of 0.1mol / L FeCl 3 An oxidizing agent, which undergoes a polymerization reaction at a temperature of 25°C to prepare a free radical polymer composite solution;

[0025] 2. Weigh 10.3gLiH 2 PO 4 and 32.5gFeC 6 h 5 o 7 ·5H 2 O is dissolved in 200mL of N,N-dimethylformamide solvent, stirred to obtain a lithium iron phosphate precursor solution, and then dried to obtain a lithium iron phosphate precursor;

[0026] 3. Weigh 10g of sucrose and 10g of lithium iron phosphate precursor and mix evenly, heat up to 600°C at a heating rate of 3.0°C / min, keep warm in air atmosphere for 4 hours, cool to 100°C, and follow step 1 100 g of the free radical polymer complex solution was mixed evenly, and kept warm for 1 hour, and then naturally cooled to room temperature to obtain a lithium iron phosp...

Embodiment 3

[0028] 1. Preparation of free radical mixed solution: weigh 10g of s-trimethylaniline monomer and dissolve in 100ml of CHCl 4 In the solvent, after stirring evenly, add 10g nano-carbon fiber, 5ml HCl dopant, 20ml (0.1mol / L) FeCl 3 Oxidant, and the polymerization reaction occurs at a temperature of 100 ° C to prepare a free radical polymer composite solution;

[0029] 2. Weigh 10.3gLiH at the same time 2 PO 4 and 32.5gFeC 6 h 5 o 7 ·5H 2 O is dissolved in 200mL of N,N-dimethylformamide solvent, stirred to obtain a lithium iron phosphate precursor solution, and then dried to obtain a lithium iron phosphate precursor;

[0030] 3. Weigh 20g of sucrose and 50g of lithium iron phosphate precursor and mix evenly, and heat up to 900°C at a heating rate of 10.0°C / min, keep it in the air atmosphere for 1 hour, then cool to 200°C, and step 1 100 g of the free radical polymer composite solution was uniformly mixed, and kept warm for 6 hours, and then naturally cooled to room temper...

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Abstract

Provided is a method for preparing a high-power and long-service-life lithium iron phosphate anode material. The lithium iron phosphate anode material is of a core-shell structure, lithium iron phosphate is adopted as a core, the first layer of a shell is a carbon layer, and the outermost layer is a free radical composite layer which is composed of a free radical polymer, a conductive agent and a dopant. The method comprises the following steps that 1, a free radial mixed solution is prepared; 2, a lithium iron phosphate precursor is prepared; 3, a lithium iron phosphate composite is prepared. According to the method, by means of the advantages that the free radical polymer is high in ion transmission rate and stable in structure and the character that the conductive agent of the anode material is high in conductivity, the high-rate charge and discharge capacity and structural stability of the anode material in the circulating process are improved, the discharge voltage platform of the material in a lithium ion battery is improved, the synergistic effect is achieved between the material and the carbon layer, and the energy density and rate performance of the lithium ion battery are improved. The lithium ion battery prepared from the material is suitable for the field of hybrid power electric automobiles.

Description

technical field [0001] The invention belongs to the field of preparation of lithium ion secondary battery materials, in particular to a preparation method of a lithium iron phosphate positive electrode material which improves the rate and cycle performance of the material by coating the surface of lithium iron phosphate. Background technique [0002] Lithium iron phosphate is a new type of battery developed in recent years, and is favored by people for its good cycle performance, environmental friendliness, and low price. At present, lithium iron phosphate is mainly coated with sucrose, glucose, etc. Substances improve the conductivity of lithium iron phosphate, such as patent (CN201310323690.X) a preparation method of lithium iron phosphate / carbon composite material, the lithium iron phosphate coating layer is sucrose, although the cycle performance of the prepared positive electrode material is improved, However, its rate performance is average, which affects the applicati...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/362H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 丁建民
Owner JIANGSU LENENG BATTERY INC
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