Ternary silicate composite cathode material and preparation method therefor

A composite positive electrode material and positive electrode material technology, applied in the field of ternary silicate composite positive electrode material and its preparation, can solve the problems of lithium volatilization loss, intensified non-stoichiometric degree and cation mixing, and achieve less emission, electrochemical The effect of excellent performance and low cost

Active Publication Date: 2016-03-02
CHINA THREE GORGES UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Considering Li 2 FeSiO 4 The synthesis of lithium requires high-temperature calcination for several hours or even 20 to 30 hours, which can easily lead to the volatilization loss of lithium, and aggravate the non-stoichiometric degree of each element in the product and the mixing of cations.

Method used

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  • Ternary silicate composite cathode material and preparation method therefor
  • Ternary silicate composite cathode material and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The drug and molar ratio required to prepare the sample satisfy the following relationship: LiCH 3 COO·2H 2 O:FeC 2 o 4 2H 2 O:Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:(C 2 h 5 ) 4 SiO 4 = 2.04:1 / 3:1 / 3:1 / 3:1. FeC 2 o 4 2H 2 O, Mn(CH 3 COO) 2 4H 2 O and Ni(CH 3 COO) 2 4H 2 O is placed in a container with a molar ratio of 1:1:1, and stirred for 30 min with absolute ethanol as a medium to obtain a mixed solution 1; LiCH 3 COO·2H 2 O was added to the mixed solution 1, stirred for 30min; then added (C 2 h 5 ) 4 SiO 4 Continue to stir for 30 minutes to obtain the mixed solution 2; keep the mixed solution 2 at a constant temperature of 80°C for 24 hours, bake it under an infrared lamp, and stir until the solvent is completely evaporated to obtain a dry material; dry the material in a vacuum oven at 100°C for 12 hours , cooled to room temperature; adding sucrose with a mass fraction of 15% to the above-mentioned dried material, using acetone as th...

Embodiment 2

[0038] The drugs and molar ratios required to prepare samples satisfy the following relationship: LiCH 3 COO·2H 2 O:FeC 2 o 4 2H 2 O:Mn(CH 3 COO) 2 4H 2 O:Ni(CH 3 COO) 2 4H 2 O:(C 2 h 5 ) 4 SiO 4 = 2.04:1 / 3:1 / 3:1 / 3:1. FeC 2 o 4 2H 2 O, Mn(CH 3 COO) 2 4H 2 O and Ni(CH 3 COO) 2 4H 2 O is placed in a container with a molar ratio of 1:1:1, and stirred for 30 min with absolute ethanol as a medium to obtain a mixed solution 1; LiCH 3 COO·2H 2 O was added to the mixed solution 1, stirred for 30min; then added (C 2 h 5 ) 4 SiO 4 Continue to stir for 30 minutes to obtain the mixed solution 2; keep the mixed solution 2 at a constant temperature of 80°C for 24 hours, bake it under an infrared lamp, and stir until the solvent is completely evaporated to obtain a dry material; dry the material in a vacuum oven at 100°C for 12 hours , cooled to room temperature; adding mass fraction to the dried material is 10% ascorbic acid, using acetone as medium, ball milling...

Embodiment 3

[0040] The drug and molar ratio required to prepare the sample satisfy the following relationship: LiCH 3 COO·2H 2 O:FeC 2 o 4 2H 2 O:Mn(CH 3 COO) 2 4H 2 O:Co(CH 3 COO) 2 4H 2 O:(C 2 h 5 ) 4 SiO 4 = 2.04:1 / 3:1 / 3:1 / 3:1. FeC 2 o 4 2H 2 O, Mn(CH 3 COO) 2 4H 2 O and Co(CH3 COO) 2 4H 2 O is placed in a container with a molar ratio of 1:1:1, and stirred for 30 min with absolute ethanol as a medium to obtain a mixed solution 1; LiCH 3 COO·2H 2 O was added to the mixed solution 1, stirred for 30min; then added (C 2 h 5 ) 4 SiO 4 Continue to stir for 30 minutes to obtain the mixed solution 2; keep the mixed solution 2 at a constant temperature of 80°C for 24 hours, bake it under an infrared lamp, and stir until the solvent is completely evaporated to obtain a dry material; dry the material in a vacuum oven at 100°C for 12 hours , cooled to room temperature; adding mass fraction of 12.3% sucrose to the dried material, using acetone as medium, ball milled for 6...

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Abstract

The invention provides a ternary silicate composite cathode material. The cathode material is carbon-coated ternary silicate having the specific structural formula: LixFe alpha M1 beta M2 gamma SiO4/C, wherein x is greater than or equal to 2.0 and less than or equal to 2.1; alpha+ beta+ gamma is equal to 1; alpha is greater than or equal to 0.2; beta is greater than or equal to 0.2; gamma is greater than or equal to 0.2; M1 and M2 are transitional metal elements; the preparation method is as follows specifically: putting lithium carbonate, ferric oxalate and two kinds of M1 and M2 sources containing different transitional metals into a container, and taking absolute ethyl alcohol as the medium for stirring for 30-180 min, and then adding ethyl silicate to obtain mixed liquid; drying the mixed liquid to obtain a dry material; adding the carbon source into the dry material, taking acetone as the medium, performing ball milling, and sintering in a nitrogen or argon atmosphere to obtain a target product; stirring the product with acetylene black and polyvinylidene fluoride in N-methyl pyrrolidone, and coating an aluminum foil with the stirred product, and then performing drying, film stamping and film pressing to obtain the ternary silicate composite cathode material plate. The preparation method is low in cost, pollution-free, low in harmful gas emission in the synthetic process, and excellent in the electrochemical performance of the material.

Description

technical field [0001] The invention relates to a ternary silicate composite cathode material and a preparation method thereof, belonging to the field of electrochemical power sources. Background technique [0002] Lithium-ion batteries have become the most ideal energy storage devices after the 20th century due to their advantages such as high working voltage, large specific energy, small self-discharge, long cycle life and environmental friendliness. In recent years, lithium-ion batteries have been widely used in portable electronic devices, such as notebook computers, mobile phones and other electronic products, and will further become a strong competitor in the power supply of electric vehicles and defense industries in the future. As lithium-ion batteries are more and more widely used in different fields, various fields have different requirements for the performance of lithium-ion batteries. [0003] As an important part of the lithium-ion battery, the positive electr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/13H01M4/139H01M4/583
CPCH01M4/13H01M4/139H01M4/366H01M4/5825H01M4/583Y02E60/10
Inventor 张露露李振杨学林孙华斌丁晓凯周英贤
Owner CHINA THREE GORGES UNIV
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