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Tremelliform ferric phosphate and preparation method therefor

A technology of iron phosphate and tremella, applied in chemical instruments and methods, phosphorus compounds, structural parts, etc., can solve problems such as low ion and electronic conductivity, low temperature, and poor rate performance

Active Publication Date: 2016-03-23
SHANDONG GOLDENCELL ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its inherent low ionic and electronic conductivity leads to its low temperature and poor rate performance, which has become a key factor limiting its further application.

Method used

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  • Tremelliform ferric phosphate and preparation method therefor
  • Tremelliform ferric phosphate and preparation method therefor
  • Tremelliform ferric phosphate and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to the stoichiometric ratio of iron and phosphorus in the target product 1:1.05, the quality of the surfactant is 0.05% of the mass of the iron source, and the molar ratio iron source:hydrogen peroxide=1:1, respectively weigh ferrous sulfate, phosphoric acid, hexadecane base trimethylammonium bromide, measure the corresponding hydrogen peroxide (30%). Dissolve cetyltrimethylammonium bromide and ferrous sulfate in isopropanol and deionized water respectively, pour the mixture of the two into a good amount of hydrogen peroxide, and ultrasonicate at a constant temperature of 40°C for 5 minutes to form 0.05M ferric sulfate glue Beam solution A. Dissolve the weighed phosphoric acid in deionized water, and ultrasonicate at a constant temperature of 40°C for 5 minutes to prepare 0.05M phosphoric acid solution B. Pour the prepared B into A, continue to sonicate for 5 minutes, quickly transfer to the lining of a 100ml autoclave with a filling degree of 70%, tighten it...

Embodiment 2

[0029] According to the stoichiometric ratio of iron and phosphorus in the target product 1:1.02, the mass of the surfactant is 0.1% of the mass of the iron source, and iron nitrate, phosphoric acid, and polyvinylpyrrolidone are weighed respectively. Dissolve the surfactant and ferric nitrate in deionized water, and ultrasonicate at a constant temperature of 50°C for 5 minutes to prepare 0.1M ferric sulfate micellar solution A. Dissolve the weighed phosphoric acid in deionized water, and ultrasonicate at a constant temperature of 50°C for 5 minutes to prepare 0.05M phosphoric acid solution B. Pour the above prepared B into A, continue to sonicate for 5 minutes, quickly transfer to the lining of a 100ml autoclave with a filling degree of 60%, tighten it, and put it in an oven at 100°C for 6 hours for hydrothermal reaction. After the reaction, turn off the oven, let it cool down to room temperature naturally, turn on the autoclave, transfer the mixture to a centrifuge tube, cent...

Embodiment 3

[0036] Replace the iron source, phosphorus source, and surfactant with ferric sulfate and ammonium hydrogen phosphate respectively, and the ratio remains unchanged. According to the method in Example 2, tremella-shaped iron phosphate is first synthesized, and then the synthesized iron phosphate is used as the iron source to synthesize phosphoric acid. Lithium iron material for half-battery production.

[0037] image 3 The charge-discharge diagrams of the half-cells assembled in this example at different rates in the range of 2.3-4.2V, the lithium iron phosphate synthesized by this method shows excellent rate and cycle performance, and the discharge specific capacity at 10C is 0.1C 69.8% of the specific capacity under discharge is 77.9% of the specific capacity under 1C.

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Abstract

The invention relates to tremelliform ferric phosphate and a preparation method therefor. The method comprises the steps: (1) preparing an iron source micellar solution; (2) preparing a metal-ion-free phosphorus source solution; (3) mixing the iron source micellar solution and the metal-ion-free phosphorus source solution; (4) carrying out hydrothermal reaction; and (5) carrying out centrifugal washing and product drying. According to ferric phosphate prepared by the method, nanosheets grow in order so as to form multi-dimensional tremelliform, the cycle and rate capability are excellent, and the low-temperature properties are good. According to the method, impurities such as other cations are not introduced, so that the purity is high, and the stoichiometric ratio is good.

Description

technical field [0001] The invention belongs to the technical field of iron phosphate material preparation technology, and in particular relates to a tremella-shaped iron phosphate and a preparation method thereof. Background technique [0002] The advent of the information age, the depletion of oil resources, the development of pure electric / hybrid electric vehicles, and the call for environmental protection all urgently require a new generation of energy batteries that are small, light, long-life, green and pollution-free, fast charging and discharging, and safe. Lithium-ion battery is a new type of green and environment-friendly battery. It has the advantages of high energy density and power density, high working voltage, small self-discharge, no memory effect, long cycle life, light weight, and low pollution. It was developed in the 1990s and has grown rapidly. Become the most important and most promising new battery in the 21st century. [0003] Lithium iron phosphate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00C01B25/375C01P2004/03C01P2004/30H01M4/5825H01M10/0525Y02E60/10
Inventor 关成善宗继月孟博郝文娟杜显振
Owner SHANDONG GOLDENCELL ELECTRONICS TECH
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