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Method of preparing uniformly carbon wrapped LiFePO4 nano composite material by using saccharomycete

A nano-composite material, yeast technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of unsatisfactory coating effect, complex reaction process, low electronic conductivity, etc. Simple synthesis process and large specific surface area

Inactive Publication Date: 2019-05-17
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] LiFePO 4 Due to its stable structure, good thermal stability, low price, and environmental friendliness, it is one of the promising lithium-ion battery cathode materials, but LiFePO 4 There are following problems in the synthesis process: (1) Fe 2+ easily oxidized to Fe 3+ ; (2) low electronic conductivity; (3) Li + low diffusion coefficient
This method is generally prepared LiFePO 4 Materials and carbon sources are evenly mixed, and sintered at high temperature in an inert atmosphere to form a carbon coating layer. The process is characterized by large equipment investment, complex reaction process, long reaction cycle, high energy consumption, difficult mass production, and unsatisfactory coating effect.

Method used

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  • Method of preparing uniformly carbon wrapped LiFePO4 nano composite material by using saccharomycete
  • Method of preparing uniformly carbon wrapped LiFePO4 nano composite material by using saccharomycete
  • Method of preparing uniformly carbon wrapped LiFePO4 nano composite material by using saccharomycete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Preparation of composite materials when the sintering temperature is 800°C:

[0040] The present invention uses FeCl 2 4H 2 O, LiOH·H 2 O, NH 4 h 2 PO 4 And appropriate amount of citric acid monohydrate, dextrose and dry yeast as raw materials.

[0041] First weigh 2g of yeast and 4g of glucose, incubate in 100ml of water for 0.5 hours, the optimum temperature is 35°C, then centrifuge and wash 3 times to obtain pure active yeast cells. Weigh 1.9881g (0.01mol) FeCl 2 4H 2 O was dissolved in 80ml deionized water, and the washed yeast cells were added, and after magnetic stirring for 4 hours, 0.4196g (0.01mol) LiOH·H 2 O, 1.1505g (0.01mol) NH 4 h 2 PO 4 , 4.2028g (0.02mol) of citric acid monohydrate, the resulting solution was stirred at 80°C for 5h to form a sol, and the sol was dried in a drying oven at 120°C for 12h to form a gel. Grinding the gel in N 2 Sintered at 350°C for 4 hours under atmosphere, ground after natural cooling, and finally in N 2 Under th...

Embodiment 2

[0045] Preparation of composite materials when the sintering temperature is 700°C:

[0046] The preparation steps are the same as in Example 1, except that the sintering temperature is different. Example 2 The sintering temperature is 700°C, and the sample is marked as: LFP / C-700.

Embodiment 3

[0048] Preparation of composite materials when the sintering temperature is 750°C:

[0049] The preparation steps are the same as in Example 1, except that the sintering temperature is different. Example 2 The sintering temperature is 750°C, and the sample is marked as: LFP / C-750.

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Abstract

The invention relates to a method of preparing a uniform carbon wrapped LiFePO4 nano composite material by using saccharomycete. The method comprises steps of with saccharomycete as a template agent and a carbon source, weighing raw materials according to proportion, dissolving FeCl2.4H2O in deionized water, then adding cultured saccharomycete cells, stirring with magnetic force, then adding NH4H2PO4, LiOH.H2O and a proper amount of citric acid monohydrate in sequence, stirring obtained solution in a water bath pot so as to form sol, and drying the sol to obtain gel. The obtained gel is grinded and then is inserted in inert atmosphere so as to prepare the carbon wrapped LiFePO4 nano material.

Description

technical field [0001] The invention relates to a preparation of uniform carbon-coated LiFePO with yeast 4 Nanocomposite approach. It specifically involves biomineralization assembly and sol-gel method, and combines them reasonably. When the amount of yeast is constant, the sintering temperature can be adjusted to prepare high-performance carbon-coated LiFePO. 4 nanocomposites. Background technique [0002] LiFePO 4 Due to its stable structure, good thermal stability, low price, and environmental friendliness, it is one of the promising lithium-ion battery cathode materials, but LiFePO 4 There are following problems in the synthesis process: (1) Fe 2+ easily oxidized to Fe 3+ ; (2) low electronic conductivity; (3) Li + Diffusion coefficient is low. Currently, LiFePO 4 The low conductivity of LiFePO has been perplexing its application and promotion. The urgent task of improving its electrochemical performance is to increase its conductivity, and to improve LiFePO 4 T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/583H01M4/62H01M10/0525C01B25/26C01B25/45C01B25/37
CPCY02E60/10
Inventor 冯旺军陈林景
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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