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A rare earth element co-doped lithium manganese phosphate/carbon composite positive electrode material and preparation method thereof

A composite positive electrode material, lithium manganese phosphate technology, applied in the direction of electrical components, battery electrodes, structural parts, etc., can solve the problems of unclear doping position, electrochemical performance needs to be improved, etc., to achieve excellent comprehensive electrochemical performance, crystal The effect of small grain size and grain refinement

Active Publication Date: 2020-03-17
东北大学秦皇岛分校
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this scheme is that the position of doping cannot be clearly defined by the method of solid phase mixed calcination, and the electrochemical performance still needs to be improved.

Method used

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  • A rare earth element co-doped lithium manganese phosphate/carbon composite positive electrode material and preparation method thereof
  • A rare earth element co-doped lithium manganese phosphate/carbon composite positive electrode material and preparation method thereof
  • A rare earth element co-doped lithium manganese phosphate/carbon composite positive electrode material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0109] This embodiment provides a method for preparing lithium manganese phosphate / carbon composite cathode material co-doped with rare earth elements, the specific method is:

[0110] (1) Prepare LiOH·H with a concentration of 1.97mol / L 2 O and 200mL of a mixed solution of lanthanum nitrate with a concentration of 0.01mol / L, the mixed solution was fully stirred and heated to 45°C, and then 50mL of H with a concentration of 1.5mol / L 3 PO 4 The solution was added dropwise to the above mixed solution at a flow rate of 2 mL / min. After the dropwise addition, the solution was allowed to stand, and centrifuged to obtain the precipitated product Li 2.955 La 0.015 PO 4 . The dried product is put into a ball mill jar, under ethanol as the ball milling medium, sucrose is the carbon source, and the mass fraction of the sucrose is the added Li 2.955 La 0.015 PO 4 10wt.% of the mass, after ball milling for 3 hours, under a nitrogen atmosphere, the heating rate is 10°C / min, and calc...

Embodiment 2

[0119] This embodiment provides a method for preparing lithium manganese phosphate / carbon composite cathode material co-doped with rare earth elements, the specific method is:

[0120] (1) Prepare LiOH·H with a concentration of 2.91mol / L 2 O and 200 mL of a mixed solution of neodymium nitrate with a concentration of 0.03 mol / L, the mixed solution was fully stirred and heated to 55 °C, and then 50 mL of H with a concentration of 1.7 mol / L 3 PO 4 The solution was added dropwise to the above mixed solution at a flow rate of 3 mL / min. After the dropwise addition, the solution was allowed to stand, and centrifuged to obtain the precipitated product Li 2.91 Nd 0.03 PO 4 . The dried product is put into a ball mill jar, under acetone as the ball milling medium, glucose is the carbon source, and the mass fraction of glucose is the added Li 2.91 Nd 0.03 PO 4 9wt.% of the mass, after ball milling for 3 hours, under an argon atmosphere, the heating rate is 15°C / min, and calcined a...

Embodiment 3

[0129] This embodiment provides a method for preparing lithium manganese phosphate / carbon composite cathode material co-doped with rare earth elements, the specific method is:

[0130] (1) Prepare LiOH·H with a concentration of 1.985mol / L 2 O and 200mL of erbium acetate mixed solution with a concentration of 0.005mol / L, the mixed solution was fully stirred and heated to 50°C, and then 50mL of H with a concentration of 1.5mol / L 3 PO 4 The solution was added dropwise to the above mixed solution at a flow rate of 4 mL / min. After the dropwise addition, the solution was allowed to stand, and centrifuged to obtain the precipitated product Li 2.97755 Er 0.0075 PO 4 . The dried product is put into a ball milling jar, and under cyclohexane as the ball milling medium, maltose is the carbon source, and the mass fraction of maltose is the added Li 2.97755 Er 0.0075 PO 4 9wt.% of the mass, after ball milling for 3 hours, under an argon atmosphere, the heating rate was 11°C / min, and...

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Abstract

The invention provides a rare-earth element co-doped lithium manganese phosphate / carbon composite positive electrode material and a preparation method thereof. The composite positive electrode material comprises lithium manganese phosphate and a carbon layer, wherein the carbon layer is arranged in the lithium manganese phosphate, and lithium and manganese in the lithium manganese phosphate are co-doped by a rare-earth element. The preparation method of the composite positive electrode material comprises the steps of 1) preparing lithium-doped lithium phosphate coated with a first carbon layer; and 2) preparing the rare-earth element co-doped lithium manganese phosphate / carbon composite positive electrode material from the lithium-doped lithium phosphate coated with the first carbon layer,wherein the first carbon layer is arranged in the rare-earth element co-doped lithium manganese phosphate / carbon composite positive electrode material. The positive electrode material provided by theinvention has the advantages of good electrochemical property, small grain size, uniform particle size, large specific area, high electrical conductivity, high crystallinity and large cell size, andthe method is green and environmental-friendly and is low in cost, and the process is easy to control.

Description

technical field [0001] The invention belongs to the technical scope of preparation of new energy materials, and relates to a lithium manganese phosphate / carbon composite cathode material co-doped with rare earth elements and a preparation method thereof. Background technique [0002] Since its commercialization in 1991, lithium-ion batteries have attracted widespread attention due to their high safety performance, good cycle stability, and high specific energy, and are widely used in notebook computers, mobile phones, and new energy vehicles. In lithium-ion batteries, the cathode material is the most important component and the key to determining the performance of lithium-ion batteries. In recent years, polyanionic phosphate materials represented by lithium iron phosphate have attracted great attention in the industry due to their extensive advantages, but the working voltage platform of lithium iron phosphate is low, only 3.4V vs. Li / Li + , limiting the improvement of bat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/5825H01M4/625H01M10/0525Y02E60/10
Inventor 罗绍华李俊哲闫绳学刘欢刘颖颖于顺志祁鸿飞王庆王志远张亚辉刘延国郝爱民
Owner 东北大学秦皇岛分校