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Li2FeSiO4@mesoporous carbon lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of large particles, poor carbon matrix dispersion, and low purity, and achieve low calcination temperature, short holding time, and increased The effect of contact area

Active Publication Date: 2019-12-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the invention is to solve the Li 2 FeSiO 4 In the / C complex, the purity is lower, Li 2 FeSiO 4 The problem of large particles and poor dispersion in carbon matrix provides a new preparation method of lithium ferrous silicate / carbon cathode material for lithium ion batteries

Method used

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  • Li2FeSiO4@mesoporous carbon lithium ion battery positive electrode material and preparation method thereof
  • Li2FeSiO4@mesoporous carbon lithium ion battery positive electrode material and preparation method thereof
  • Li2FeSiO4@mesoporous carbon lithium ion battery positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0031] Dissolve 0.82g phloroglucinol, 0.61g glyoxylic acid monohydrate, and 1.61g F127 in 40mL ethanol, add 1.2784g lithium nitrate, 3.7451g ferric nitrate nonahydrate, 1.9312g ethyl orthosilicate, and stir to dissolve. The mixed solution was evenly transferred to 4 petri dishes. After evaporating the solvent at room temperature in the fume hood, it was dried at 80°C to obtain a xerogel. Rise to 800°C at 2°C / min and hold for 2 hours to obtain Li 2 FeSiO 4 @Mesoporous Carbon Composites.

Embodiment 2

[0033]Dissolve 0.82g phloroglucinol, 0.61g glyoxylic acid monohydrate, and 1.61g F68 in 50mL ethanol, add 1.8898g lithium acetate, 1.6130g ferrous acetate, and 1.4111g methyl orthosilicate successively, stir and dissolve, and obtain The mixed solution was evenly transferred to 5 petri dishes. After evaporating the solvent at room temperature in the fume hood, it was then dried at 60°C to obtain a xerogel. Rise to 700°C at 3°C / min and hold for 3h to obtain Li 2 FeSiO 4 @Mesoporous Carbon Composites.

Embodiment 3

[0035] Dissolve 1.8358g of phenol, 0.61g of glyoxylic acid monohydrate, and 1.61g of P123 in 60mL of ethanol, add 1.2784g of lithium nitrate, 3.7451g of ferric nitrate nonahydrate, and 1.9312g of ethyl orthosilicate in turn, stir and dissolve, and the resulting mixed solution Evenly transfer to 6 Petri dishes, evaporate the solvent at room temperature in the fume hood, and then dry at 70°C to obtain dry gels, and dry the obtained dry gels at 1°C / min up to 600°C and hold for 4 hours to obtain Li 2 FeSiO 4 @Mesoporous Carbon Composites.

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Abstract

The invention provides a Li2FeSiO4@mesoporous carbon lithium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the steps of 1, dissolving a certain amount of phenol, glyoxylic acid monohydrate and a surfactant into ethanol; 2, sequentially adding the raw materials according to a molar ratio of lithium to iron to silicon of 1:1:2, and stirring for dissolving; 3, transferring the obtained mixture into a culture dish, evaporating the solvent in a fume cupboard at the room temperature, and drying to obtain xerogel; and step 4, heating the xerogel to 600-800 DEG C in an inert atmosphere or a reducing atmosphere, and carrying out heat preservation for 2-4 hours. The preparation process provided by the invention is liquid phase mixing, so that the purity of Li2FeSiO4 in the obtained compound is relatively high and reaches a nanoscale, Li2FeSiO4 is uniformly dispersed in a carbon matrix, and the electrochemical performance is optimized.Due to addition of the surfactant, the obtained carbon matrix is of a mesoporous structure, so that sufficient infiltration of an electrolyte is facilitated, the contact area of an electrode and the electrolyte is increased, the diffusion and transfer of ions and electrons are accelerated, and the electrochemical lithium storage performance is facilitated to be improved.

Description

technical field [0001] The invention relates to the technical field of lithium battery cathode materials, in particular to a Li 2 FeSiO 4 @Mesoporous carbon lithium-ion battery cathode material and its preparation method. Background technique [0002] Due to the advantages of high energy density, power density, and long cycle life, lithium-ion batteries have gradually expanded their application fields from portable electronic devices to electric vehicles and grid storage. However, the energy and power density of lithium-ion batteries need to be further improved to achieve larger-scale applications in electric vehicles and grid storage. Cathode materials are the bottleneck in the development of next-generation high-energy-density lithium-ion batteries. Exploring new cathode materials or modifying existing cathode materials is the key to improving the energy density of lithium-ion batteries. [0003] Since the first report of Li by Armand et al. in 2005 2 FeSiO 4 Since, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525B82Y30/00
CPCH01M4/5825H01M4/625H01M10/0525B82Y30/00H01M2004/028Y02E60/10
Inventor 孙世姣张昶
Owner NANJING UNIV OF TECH
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