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A lithium-rich manganese-based electrode material and preparation method thereof

A lithium-rich manganese-based, positive electrode technology, used in positive electrodes, battery electrodes, lithium batteries, etc., can solve problems such as poor rate and cycle performance, low Coulomb efficiency, and voltage decay.

Active Publication Date: 2021-04-27
ENERGY RES INST OF SHANDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its inherent disadvantages limit its application, including: (1) low Coulombic efficiency due to irreversible phase transition during the first cycle; Dissolution; (3) Voltage decay during long-term cycling; (4) Poor rate and cycle performance, etc.

Method used

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  • A lithium-rich manganese-based electrode material and preparation method thereof
  • A lithium-rich manganese-based electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation method of lithium-rich manganese-based positive electrode material,

[0028] (1) niobium oxalate is dissolved in deionized water to be prepared into a solution with a pH value of 1;

[0029] (2) Mix lithium-rich manganese-based materials with ammonium niobium oxalate solution, stir and heat to 60°C to form a suspension; the amount of ammonium niobium oxalate added is LMR (0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) 2wt% of the material mass;

[0030] (3) Lithium nitrate, EDTA and dimethyl ether were added to the above suspension at a mass ratio of 1:1:0.1, and heated at 60°C for 10 hours to form a Li-Nb precursor-coated lithium-rich manganese-based material;

[0031] (4) The lithium-rich manganese-based material coated with the Li-Nb precursor was calcined at 900° C. for 5 h, and the calcined manganese-based positive electrode material was crushed to 200 mesh.

Embodiment 2

[0033] Preparation method of lithium-rich manganese-based positive electrode material,

[0034] (1) ammonium niobium oxalate is dissolved in deionized water, and is mixed with a solution with a pH value of 2;

[0035] (2) Mix lithium-rich manganese-based materials with ammonium niobium oxalate solution, stir and heat to 80°C to form a suspension; the amount of ammonium niobium oxalate added is LMR (0.5Li 2 MnO 3 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 ) 1wt% of the mass of the material;

[0036] (3) Add lithium source, complexing agent, and dispersant to the above suspension at a mass ratio of 1:2:0.3, and heat at 95°C for 2 hours to form a Li-Nb precursor-coated lithium-rich manganese-based material ;

[0037] (4) Calcining the lithium-rich manganese-based material coated with the Li-Nb precursor obtained in step (3) at 600° C. for 12 hours, and pulverizing the calcined lithium-rich manganese-based positive electrode material to 300 mesh.

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Abstract

A preparation method of a lithium-rich manganese-based positive electrode material, comprising the following steps: (1) dissolving a niobium carboxylic acid derivative in deionized water to prepare a solution with a pH value of 1 to 3; (2) dissolving a lithium-rich The manganese-based material is mixed with the niobium carboxylic acid derivative solution, stirred and heated to 55-80°C, preferably 60-65°C, to form a suspension; (3) lithium source, complexing agent and dispersant are mixed according to the molar ratio of 1: 1-3:0.01-0.5 is added to the above suspension, heated at 60-100°C for 2-10h to form a Li-Nb precursor-coated lithium-rich manganese-based material; (4) step (3) to obtain The lithium-rich manganese-based material coated with the Li-Nb precursor was calcined at 500-900°C for 5-15h to obtain a manganese-based positive electrode material. This method utilizes the mild acidity of niobium carboxylic acid derivative solution to construct Li on the surface of lithium-rich manganese-based materials. + / H + structural defects, and through the addition of lithium sources and high-temperature solid-state reactions, the construction of "Nb‑doped / LiNbO 3 Coating" double-shell surface reconstruction layer significantly improves the electrochemical performance of lithium-rich manganese-based materials.

Description

technical field [0001] The invention relates to a method for performing surface modification treatment on a lithium-rich manganese-based positive electrode material and an electrode prepared by the method, belonging to the technical field of lithium batteries. Background technique [0002] Lithium-rich manganese-based (xLi 2 MnO 3 ·(1-x)LiMO 2 ) discharge specific capacity can reach 250mAh·g -1 , and low cost, it is expected to become the anode material of the next generation electric vehicle power battery. However, its inherent disadvantages limit its application, including: (1) low Coulombic efficiency due to irreversible phase transition during the first cycle; Dissolution; (3) voltage decay during long-term cycling; (4) poor rate and cycle performance, etc. In response to the above problems, researchers have proposed some solutions, mainly including bulk doping and surface coating. The main element doped is Al 3+ , Mg 2+ 、Ti 4+ These mainly play the role of stab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M10/0525H01M2004/021H01M2004/028H01M4/62H01M10/052Y02E60/10
Inventor 蔡飞鹏王波秦显忠蒋波姜桂林
Owner ENERGY RES INST OF SHANDONG ACAD OF SCI