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Modification method of cerium-tin compound oxide coated lithium-rich manganese-based positive material

A composite oxide, lithium-rich manganese-based technology, applied in nanotechnology for materials and surface science, positive electrodes, active material electrodes, etc., can solve problems such as irreversible oxygen loss, achieve high efficiency for the first time, and rapid synthesis method The effect of simplicity and stable crystal structure

Active Publication Date: 2018-06-15
UNIV OF SCI & TECH BEIJING
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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 solve the technical problem of irreversible oxygen loss of lithium-rich manganese-based cathode materials during the first cycle, and propose a method for preparing a new type of coated modified lithium-rich manganese-based cathode material in situ by hydrothermal treatment

Method used

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  • Modification method of cerium-tin compound oxide coated lithium-rich manganese-based positive material
  • Modification method of cerium-tin compound oxide coated lithium-rich manganese-based positive material
  • Modification method of cerium-tin compound oxide coated lithium-rich manganese-based positive material

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Embodiment 1

[0029] The lithium-rich manganese-based positive electrode material that contains the cerium-tin composite oxide coating of the present embodiment is that the chemical formula is Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The surface of the lithium-rich manganese-based positive electrode material is coated with cerium-tin composite oxide; in the example, the coating amount of ceria is 4% by mass.

[0030] Its preparation method is:

[0031] (1) Disperse 0.5g of lithium-rich manganese-based positive electrode material into 50mL of secondary water solvent, form a uniform mixed solution through ultrasonic vibration, and record it as solution A;

[0032](2) 0.052g cerium nitrate hexahydrate Ce(NO 3 ) 3 ·6H 2 Disperse O into 20mL secondary water solvent, add 1.0M NaOH solution, adjust the pH of the solution to 12, and record it as B solution;

[0033] (3) Mix the A solution in the step (1) and the B solution in the step (2) evenly, then place it in a reactor for hydrothermal tr...

Embodiment 2

[0036] The lithium-rich manganese-based positive electrode material that contains the cerium-tin composite oxide coating of the present embodiment is that the chemical formula is Li[Li 0.2 mn 0.54 Ni 0.13 co 0.13 ]O 2 The surface of the lithium-rich manganese-based positive electrode material is coated with cerium-tin composite oxide; in the embodiment, the coating amount of ceria is 4% by mass, and the molar ratio of cerium and tin elements is 8:2.

[0037] Its preparation method is:

[0038] (1) Disperse 0.5g of lithium-rich manganese-based positive electrode material into 50mL of secondary water solvent, form a uniform mixed solution through ultrasonic vibration, and record it as solution A;

[0039] (2) 0.052g cerium nitrate hexahydrate Ce(NO 3 ) 3 ·6H 2 O and 0.012 g tin tetrachloride pentahydrate SnCl 4 ·5H 2 Disperse O into 20mL of secondary water solvent, add 1.0M NaOH solution, adjust the pH of the solution to 12, and record it as solution B;

[0040] (3) Mi...

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Abstract

The invention discloses a modification method of a cerium-tin compound oxide coated lithium-rich manganese-based positive material. The body of the material is a lithium-rich manganese-based positivematerial, and the surface coated substance of the material is a cerium-tin compound oxide material containing rich oxygen defects. The modification method comprises the following preparation steps: (1) dispersing the lithium-rich manganese-based positive material into a secondary water solvent, and forming a uniform mixed solution through ultrasonic oscillation to be marked as an A solution; (2) dispersing a metal salt containing Sn and Ce elements into the secondary water solvent, adding an alkaline source to adjust the pH of the solution to be 12, and marking the solution to be a B solution;(3) after uniformly mixing the A solution and the B solution, putting the mixture into water at the temperature of 140 to 220 DEG C inside a reaction still for heat treatment for 12 to 36 h, and washing, filtering and drying to obtain a precursor material; and (4) after sufficiently grinding the precursor material, carrying out calcinations at the temperature of 450 to 650 DEG C for 3 to 10 h, and cooling to room temperature so as to obtain the cerium-tin compound oxide coated lithium-rich manganese-based positive material. According to the method, the surface coating for the lithium-rich manganese-based positive material is realized through hydro-thermal treatment, the preparation technology is simple, and the obtained material is high in degree of crystallinity, high in capacity and good in rate capability.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and in particular relates to a preparation method for surface modification of a lithium-rich manganese-based positive electrode material that can effectively suppress oxygen loss in a cycle process and its application in lithium ion batteries. Background technique [0002] Driven by the energy crisis and environmental crisis, along with the rapid development of electric vehicles, lithium-ion batteries have significant Advantages, are widely used in laptops, mobile phones, cameras and other portable electronic devices. With the continuous advancement of science and technology and the continuous growth of people's needs, the development and manufacture of lithium-ion batteries with high performance, lightness and low cost is still a research and development hotspot. The high energy density of lithium-ion batteries makes them highly competitive in the field of p...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李建玲刘艳莹杨哲
Owner UNIV OF SCI & TECH BEIJING
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