Preparation method of lithium manganous silicate cathode material with mesoporous structure

A technology of lithium manganese silicate and cathode material, applied in structural parts, battery electrodes, electrical components, etc., can solve the problems of low electronic conductivity, no obvious improvement in electrochemical performance, and small specific surface area of ​​lithium manganese silicate cathode material. , to achieve the effect of large specific surface area, enhanced electronic conductivity, improved electrical conductivity and high current discharge performance

Active Publication Date: 2013-11-06
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the problems that the lithium manganese silicate positive electrode material obtained by the current preparation method has a small specific surface area, low electronic conductivity, and no obvious improvement in electrochemical performance, the present invention provides a method for preparing a lithium manganese silicate positive electrode material with a mesoporous structure, In the method, a silicon-based molecular sieve and a carbon-containing template are added during the preparation process to obtain a lithium manganese silicate positive electrode material with a large specific surface area, uniform pore size distribution, stable structure, and good electrochemical performance.

Method used

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  • Preparation method of lithium manganous silicate cathode material with mesoporous structure
  • Preparation method of lithium manganous silicate cathode material with mesoporous structure
  • Preparation method of lithium manganous silicate cathode material with mesoporous structure

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Embodiment 1

[0031] Step 1, liquid phase reaction

[0032] (1) Weigh 0.1mol LiOH·H 2 O was added to 40ml of deionized water, stirred for 1 hour to dissolve, and 0.025mol silicon-based molecular sieve MCM-41 was added to the lithium salt solution, and ultrasonically dispersed for 1 hour to obtain a dispersion;

[0033] (2) Weigh 0.025mol MnCl 2 4H 2 O, add in 20ml ethylene glycol, stir for 1h until completely dissolved to obtain solution 1;

[0034] (3) Mix the above-mentioned dispersion liquid and solution 1, stir for 2 hours, add it into a polytetrafluoroethylene-lined hydrothermal reaction kettle with a volume of 100 ml, and conduct a hydrothermal reaction at 120° C. for 48 hours to obtain precipitate 1;

[0035] (4) The precipitate 1 was washed 5 times with water, filtered, and vacuum-dried at 60° C. for 12 hours to obtain the precipitate 2;

[0036]Step 2. High temperature solid phase sintering

[0037] The precipitate 2 was mechanically ball milled in a ball mill for 2 hours at a...

Embodiment 2

[0039] Step 1, liquid phase reaction

[0040] (1) Add 0.1mol of silica powder and 1.3g of carbon-containing templating agent hexadecyltrimethylammonium bromide to 500ml containing 0.4mol LiAc·2H 2 In the aqueous solution of O, add ammonia water to adjust the pH value to 10, and ultrasonically disperse for 2 hours to obtain a dispersion liquid; the predicted output of lithium manganese silicate is 16.1g;

[0041] (2) Add 0.1mol Mn(Ac) 2 4H 2 O was dissolved in 200ml absolute ethanol to obtain solution 1;

[0042] (3) The above-mentioned dispersion liquid and solution 1 were mixed, stirred for 1 h, added into a polytetrafluoroethylene-lined hydrothermal reaction kettle with a volume of 400 ml, and reacted hydrothermally at 150° C. for 36 h to obtain precipitate 1;

[0043] (4) The precipitate 1 was washed with water six times, filtered, and vacuum-dried at 90° C. for 36 hours to obtain the precipitate 2;

[0044] Step 2. High temperature solid phase sintering

[0045] The p...

Embodiment 3

[0047] Step 1, liquid phase reaction

[0048] (1) Weigh 0.06mol LiOH·H 2 O was added to 40ml of deionized water, stirred for 1 hour to dissolve it, and 0.015mol silicon-based molecular sieve SBA-15 was added to the lithium salt solution, and ultrasonically dispersed for 1 hour to obtain a dispersion;

[0049] (2) Weigh 0.015mol MnAc 2 4H 2 O, add in 20ml ethylene glycol, stir for 1h until completely dissolved, and obtain solution 1;

[0050] (3) Mix the above-mentioned dispersion liquid and solution 1, stir for 1 h, and react in a silicone oil bath at 150° C. for 24 h to obtain precipitate 1;

[0051] (4) The precipitate 1 was washed 7 times with water, filtered, and vacuum-dried at 70°C for 6 hours to obtain the precipitate 2;

[0052] Step 2. High temperature solid phase sintering

[0053] The precipitate 2 was mechanically ball-milled in a ball mill for 5 hours at a speed of 300 r / min in an acetone medium, and then calcined in a tube furnace for 8 hours under an argon ...

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Abstract

The invention discloses a preparation method of a lithium manganous silicate cathode material with a mesoporous structure, belonging to the field of lithium ion batteries. The method comprises two processes of liquid-phase reaction and high-temperature solid-phase sintering, wherein the process of liquid-phase reaction comprises the following steps of: performing ultrasonic dispersion of the mixture of a silicon-based molecular sieve or silicon dioxide and a carbon-containing template agent into an aqueous solution of lithium salt to obtain a dispersion; dissolving manganese salt in an organic solvent to obtain a solution 1; and mixing and stirring the dispersion and the solution 1, and performing hydrothermal or oil-bath reaction, washing, filtration and vacuum drying to obtain a precipitate 2; and the process of high-temperature solid-phase sintering comprises the following steps of: performing mechanical ball milling of the precipitate 2 for 2-5 hours, and calcining in a tubular furnace in an atmosphere of argon to obtain a final product, namely the lithium manganous silicate cathode material with a mesoporous structure. Through the lithium manganous silicate cathode material with a mesoporous structure, the specific surface area of the product is larger than that of the lithium manganous silicate prepared by a conventional method.

Description

technical field [0001] The invention relates to a preparation method of a mesoporous manganese lithium silicate cathode material, which belongs to the field of lithium ion batteries. Background technique [0002] Facing the increasingly serious energy crisis and environmental pollution problems, it is imperative to use green materials and develop environmentally friendly lithium-ion battery materials. The huge demand for electronic products and the potential huge market for industrial batteries such as electric vehicle batteries make the development of a new generation of lithium-ion batteries with high specific capacity, low price, safety and reliability become the focus of the research field of chemical power sources. Lithium-ion secondary batteries have the advantages of high working voltage, high energy density, good safety performance, long cycle life, and low self-discharge rate, so they are widely used in mobile communications, instruments, computers, electric vehicle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/587
CPCY02E60/12Y02E60/10
Inventor 谢嫚吴锋王秋艳陈实李丽陈人杰
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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