Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material

A porous structure, lithium iron phosphate technology, applied in the direction of battery electrodes, secondary batteries, structural parts, etc., can solve the problems of poor conductivity, poor performance, poor batch production consistency, etc., to achieve excellent consistency, short roasting time, distribution uniform effect

Inactive Publication Date: 2013-05-01
HARBIN INST OF TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problems of poor electrical conductivity of existing lithium iron phosphate materials, poor batch production consistency, and poor performance of lithium-ion batteries using it as

Method used

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  • Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material
  • Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material
  • Preparation method of carbon-coated porous nano lithium iron phosphate material and lithium ion battery taking material as anode material

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specific Embodiment approach 1

[0022] Specific implementation mode 1: The preparation method of carbon-coated porous structure nano-lithium iron phosphate material in this embodiment is prepared according to the following steps:

[0023] 1. Weigh the ferric salt, phosphorus source compound and lithium source compound according to the ratio of the amount of Fe, P and Li as 1:1:0.9~1.1, according to the mass of organic small molecule carbon source and ferric salt The ratio is 1-11:20, and the organic small molecule carbon source is weighed;

[0024] 2. Mix the ferric salt, phosphorus source compound, lithium source compound and organic small molecule carbon source weighed in step 1 evenly to obtain a mixture, then add deionized water to the mixture, stir for 2h to 4h, and obtain a dispersion liquid, Among them, the quality of deionized water is 5 to 10 times that of the mixture;

[0025] 3. Stir the dispersion liquid obtained in step 2 at a temperature of 50°C to 100°C for 6h to 7h, and control the stirring ...

specific Embodiment approach 2

[0034] Embodiment 2: This embodiment is different from Embodiment 1 in that: in step 1, the ferric salt is ferric nitrate. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0035] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the phosphorus source compound in step 1 is ammonium dihydrogen phosphate or ammonium monohydrogen phosphate. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a carbon-coated porous nano lithium iron phosphate material and a lithium ion battery taking the material as an anode material. The problems that the existing lithium iron phosphate material is poor in conductivity and poor in mass production uniformity, and a performance is poor when a lithium ion battery taking the material as an anode material conducts high multiplying power charging and discharging are solved. The method comprises the steps of 1, weighing; 2, dispersing; 3, preparing a precursor; 4, preparing an intermediate product; 5, preparing a secondary intermediate product; 6, calcining the products; and 7, obtaining the carbon-coated porous nano lithium iron phosphate material. The lithium ion battery taking the material as the anode material consists of an anode plate, a cathode plate, a separation film and an aluminum plastic composite film. The conductivity of the lithium iron phosphate material prepared with the method is improved; the product uniformity is good; and the lithium ion battery taking the material as the anode material is good in performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium iron phosphate material and a lithium ion battery using the material as a positive electrode material. Background technique [0002] Lithium iron phosphate battery has the advantages of wide source of raw materials, good safety, long cycle life, and environmental friendliness. It is an ideal power system for driving electric vehicles. However, the current lithium iron phosphate battery is still difficult to meet the requirements of pure electric vehicles and plug-in hybrid electric vehicles in terms of high-rate charge and discharge performance; and its mass production consistency is poor, resulting in the use of it as the cathode material The uneven capacity of a single lithium-ion battery makes it difficult to manage the battery pack, causing problems such as overcharging or over-discharging of some single lithium-ion batteries, which brings safety hazards. The above two points restrict the d...

Claims

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Application Information

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IPC IPC(8): H01M4/58H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 王殿龙刘铁峰汤慎之尤万龙
Owner HARBIN INST OF TECH
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