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Preparation method of boric acid lithium manganese/carbon composite material

A carbon composite material, lithium manganese borate technology, applied in positive electrodes, active material electrodes, structural parts, etc., can solve the problem of low electrochemical activity, achieve high material capacity, simple operation, and good controllability

Pending Publication Date: 2020-02-21
HUBEI POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of low electrochemical activity of lithium manganese borate materials prepared in the prior art, and provide a preparation method for preparing lithium manganese borate / carbon composite materials with high activity. The method has simple process and controllability Good, the product has the advantages of small particle size, uniform distribution, and stable electrochemical performance

Method used

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  • Preparation method of boric acid lithium manganese/carbon composite material
  • Preparation method of boric acid lithium manganese/carbon composite material
  • Preparation method of boric acid lithium manganese/carbon composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Weigh 11.11g of PVP and place it in a ball mill jar, add 50ml of ethanol, then weigh 3.69g of lithium carbonate, 11.49g of manganese carbonate and 6.18g of boric acid, and ball mill them together for 7 hours at a speed of 400rpm. The mixture is dried at 80°C, ground and placed In the atmosphere furnace, argon gas was introduced, heated to 500°C at a heating rate of 5°C / min, kept for 10h, and then cooled to room temperature with the furnace to obtain a black powdery product. XRD analysis confirmed that the product was m-type LiMnBO 3 , the particle size is less than 100nm, and the distribution is uniform, such as figure 1 shown.

Embodiment 2

[0025] Weigh 11.11g of PVP and place it in a ball mill jar, add 50ml of acetone, then weigh 3.69g of lithium carbonate, 11.49g of manganese carbonate and 6.18g of boric acid, and ball mill them together for 7 hours at a speed of 400rpm. The mixture is dried at 80°C, ground and placed In the atmosphere furnace, pass in argon gas, heat to 400, 500, 600, 700 and 800°C at a heating rate of 5°C / min, keep it warm for 10h, and then cool to room temperature with the furnace to obtain black or gray black powdery boric acid Manganese-lithium / carbon composite material, wherein the reaction products at 400, 500 and 600°C are monoclinic manganese lithium borate, and the reaction products at 700 and 800°C are hexagonal manganese lithium borate.

Embodiment 3

[0027] Weigh 5.56g of PVP and place it in a ball mill jar, add 50ml of deionized water, then weigh 4.28g of lithium hydroxide monohydrate, 24.51g of manganese acetate tetrahydrate and 3.48g of boron oxide, and ball mill them together for 10 hours at a speed of 300rpm. Dry at 80°C, grind it and put it in an atmosphere furnace, feed it with argon, heat it up to 500°C at a heating rate of 5°C / min, keep it for 10 hours, and then cool it to room temperature with the furnace to get black powdered lithium manganese borate / carbon composite material.

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Abstract

The invention discloses a preparation method of a boric acid lithium manganese / carbon composite material. The method comprises the following steps of (1) weighing a carbon source, wherein the carbon source is PVP or a mixture of PVP and other carbon-containing substances; adding a dispersing agent or directly putting into a ball-milling tank without adding the dispersing agent; and then preparingand adding a lithium source, a manganese source and a boron source, carrying out ball-milling for 1-10 hours at a rotating speed of 100-500 rpm, drying the mixture at 40-120 DEG C, and grinding to obtain a precursor powder; (2) putting the precursor powder into an atmosphere furnace; heating to 350-800 DEG C at a heating rate of 1-20 DEG C / min, carrying out heat preservation for 5-30 hours, cooling to a room temperature along with the furnace, introducing an inert gas in a whole process to avoid oxidation of Mn<2+>, obtaining a black powdery final product with a carbon content of 1-20 wt.%. The preparation method is simple in process and is easy for large-scale production, and a prepared material is uniform in particle, high in capacity and stable in cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a simple solid-phase method for synthesizing a manganese lithium borate / carbon composite material, in particular to a preparation method of a manganese lithium borate / carbon composite material. Background technique [0002] Polyanionic compounds, as cathode materials for lithium-ion batteries, have the advantages of high safety, good reversibility, and stable performance, and have developed rapidly in recent years, especially polyanionic phosphate LiFePO 4 The successful commercialization of these materials has drawn more attention to such materials. LiFePO 4 The theoretical specific capacity is 170mAh / g, the output voltage (relative to Li / Li + )3.4V; while lithium manganese borate (LiMnBO 3 ) has a theoretical specific capacity of up to 222mAh / g, and the output voltages of the two crystal forms are 3.7V (monoclinic m-type) and 4...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/58H01M4/62H01M10/0525
CPCH01M4/5825H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 胡成林洪博龙易惠华章菊萍陈雪梅
Owner HUBEI POLYTECHNIC UNIV