Preparation method of carbon-coated sodium iron phosphate electrode material with hollow structure

A carbon-coated sodium iron phosphate and electrode material technology, applied in positive electrodes, battery electrodes, structural parts, etc., can solve the problems of poor sodium rate performance, low electronic conductivity and ion diffusion coefficient of positive electrode materials, and achieve excellent rate Performance and cycle stability, enhanced conductivity, and the effect of promoting transport

Inactive Publication Date: 2020-04-03
HARBIN INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The present invention will solve existing NaFePO 4 The low electron conductance and ion diffusion coefficient make it a problem of poor sodium rate performance as a positive electrode material for sodium ion batteries, and a method for preparing a carbon-coated sodium iron phosphate electrode material with a hollow structure is provided

Method used

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  • Preparation method of carbon-coated sodium iron phosphate electrode material with hollow structure
  • Preparation method of carbon-coated sodium iron phosphate electrode material with hollow structure
  • Preparation method of carbon-coated sodium iron phosphate electrode material with hollow structure

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specific Embodiment approach 1

[0021] Specific embodiment one: the preparation method of the carbon-coated sodium iron phosphate electrode material of a kind of hollow structure of this embodiment, it is to carry out according to the following steps:

[0022] 1. Dissolving iron source, sodium-containing phosphorus source and nitrogen-containing organic polymer compound in water to obtain a mixed solution;

[0023] The mass ratio of the iron source to the nitrogen-containing organic polymer compound is 1:(1~5); the molar ratio of the iron element in the iron source to the phosphorus element in the sodium-containing phosphorus source is 1:(1~5 ); the volume ratio of the mass of the iron source to water is 1g:(5~20)mL;

[0024] 2. Stir the mixed solution magnetically for 1h to 5h at a temperature of 10°C to 40°C to obtain a uniformly mixed solution;

[0025] 3. Use a rotary evaporator to heat the uniformly mixed solution until the water is completely evaporated at a temperature of 60°C to 120°C to obtain a un...

specific Embodiment approach 2

[0033] Specific embodiment two: this embodiment is different from specific embodiment one: the iron source described in step one is Fe(NO 3 ) 3 9H 2 O, FeCl 3 ·6H 2 O or Fe 2 (SO 4 ) 3 9H 2 O. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the sodium-containing phosphorus source described in step one is NaH 2 PO 2 ·H 2 O, Na 2 HPO 4 12H 2 O or NaH 2 PO 4 2H 2 O. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a carbon-coated sodium iron phosphate electrode material with a hollow structure, and relates to a preparation method of an electrode material. The invention solves the problem that the existing NaFePO4 has low electron conductivity and ion diffusion coefficient, so that the NaFePO4 has poor sodium rate capability when being used as the sodium ion battery positive electrode material. The preparation method comprises the following steps: 1, dissolving an iron source, a sodium-containing phosphorus source and a nitrogen-containing organic polymer compound in water to obtain a mixed solution; 2, magnetically stirring to obtain a uniformly mixed solution; 3, keeping the temperature of the uniformly mixed solution until water is completely evaporated to obtain uniformly mixed powder; 4, carrying out heat treatment in a tubular furnace. The preparation method is used for preparing the carbon-coated sodium iron phosphate electrode material withthe hollow structure.

Description

technical field [0001] The invention relates to a preparation method of an electrode material. Background technique [0002] Since the first discovery of lithium-ion batteries, they have attracted widespread attention because of their advantages such as high energy density and good cycle performance. Over the past few decades, small and lightweight portable electronic devices (eg, laptops, mobile phones) have been widely used all over the world. In recent years, under the impetus of "green" technology, lithium-ion batteries have expanded from portable products to large-scale applications, especially in the field of electric vehicles. But the amount of lithium resources on Earth will not be enough to meet the growing needs of human beings. Sodium is located below lithium in the periodic table of elements. It has many similar chemical properties with lithium, and the storage of sodium resources is more abundant. Therefore, sodium-ion batteries have also attracted people's a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/625H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 亓钧雷王昭月贾赫男冯吉才
Owner HARBIN INST OF TECH
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