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Preparation method of Mg and Ti composite doped lithium-rich manganese based positive electrode material

A lithium-rich manganese-based, positive electrode material technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problem of material capacity reduction, etc., to achieve the effect of low dosage, suppressed median voltage drop, and slow median voltage drop

Active Publication Date: 2017-05-24
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional doping methods including mixed doping can improve the stability of materials to a certain extent, but often lead to a significant reduction in material capacity

Method used

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  • Preparation method of Mg and Ti composite doped lithium-rich manganese based positive electrode material
  • Preparation method of Mg and Ti composite doped lithium-rich manganese based positive electrode material
  • Preparation method of Mg and Ti composite doped lithium-rich manganese based positive electrode material

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: prepare Li 1.17 mn 0.55 Ni 0.16 co 0.08 Mg 0.003 Ti 0.016 o 2

[0027] like figure 1 As shown, prepare a metal sulfate solution with a molar ratio of Ni, Co, and Mn of 2:1:7, divide the metal salt solution into two parts with a volume ratio of 95:5, and add a certain amount of titanic acid to one part of 95% volume Tetrabutyl ester, so that the Ti element accounts for 1% of the total mass of the precursor, a certain amount of magnesium nitrate is added to a part of 5% volume, so that the Mg element accounts for 0.1% of the total mass of the precursor, and the Ti-containing mixed solution is first added to the reaction In the kettle, add a certain concentration of sodium hydroxide and ammonia solution at the same time, add ammonia and salt solution dropwise at a constant speed, control the pH of the reaction to 10.0-10.8, and control the reaction temperature to 50-60°C; after all the mixed solutions containing Ti are added , add the mixed solution c...

Embodiment 2

[0028] Embodiment 2: prepare Li 1.20 mn 0.55 Ni 0.16 co 0.08 Mg 0.03 Ti 0.001 o 2

[0029]Prepare a metal sulfate solution with a molar ratio of Ni, Co, and Mn of 2:1:7, divide the metal salt solution into two parts with a volume ratio of 60:40, and add a certain amount of tetrabutyl titanate to one part of 60% volume , so that the Ti element accounts for 0.05% of the total mass of the precursor, and a certain amount of magnesium nitrate is added to a part of 40% volume, so that the Mg element accounts for 1% of the total mass of the precursor, and the mixed solution containing Ti is first added to the reaction kettle, Add a certain concentration of sodium hydroxide and ammonia solution at the same time, add ammonia and salt solution dropwise at a constant speed, control the pH of the reaction to 10.0-10.8, and control the reaction temperature to 50-60°C; after all the mixed solution containing Ti is added, add the solution containing Mg mixed solution, the control cond...

Embodiment 3

[0030] Embodiment 3: prepare Li 1.20 mn 0.56 Ni 0.16 co 0.08 Mg 0.01 Ti 0.001 o 2

[0031] Prepare a metal sulfate solution with a molar ratio of Ni, Co, and Mn of 2:1:7, divide the metal salt solution into two parts with a volume ratio of 80:20, and add a certain amount of tetrabutyl titanate to one part of 80% volume , so that the Ti element accounts for 0.05% of the total mass of the precursor, and a certain amount of magnesium nitrate is added to a part of 20% volume, so that the Mg element accounts for 0.3% of the total mass of the precursor, and the Ti-containing mixed solution is first added to the reaction kettle, Add a certain concentration of sodium hydroxide and ammonia solution at the same time, add ammonia and salt solution dropwise at a constant speed, control the pH of the reaction to 10.0-10.8, and control the reaction temperature to 50-60°C; after all the mixed solution containing Ti is added, add the solution containing Mg mixed solution, the control c...

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Abstract

The invention discloses a preparation method of an Mg and Ti composite doped lithium-rich manganese based positive electrode material, and belongs to the field of positive electrode materials of lithium ion batteries. A co-precipitation method is used for preparing a lithium-rich precursor, and Mg and Ti elements are added step by step for doping in the precursor co-precipitation preparing process. The preparation method comprises the following steps: adding the Ti element in the first half of a co-precipitation reaction, adding the Mg element in the latter half of the co-precipitation reaction, making the Ti element mainly distributed in a bulk phase, and making the Mg element mainly distributed in a surface layer of the precursor. The material properties are improved by controlling the distribution of the doping elements, so that on one hand, the doping amount of the doping elements can be reduced so as to improve the capacity per gram, and on the other hand, the functions of the two elements can be fully played, the effect superposition is achieved, and the interference between the elements during co-doping is reduced. At the same time, the preparation method is simple and is easy to industrialize.

Description

technical field [0001] The invention belongs to the field of positive electrode materials for lithium ion batteries, and relates to a method for preparing Mg and Ti compound-doped lithium-rich manganese-based positive electrode materials, and more particularly to a method for surface modification of lithium-rich manganese-based positive electrode materials. Background technique [0002] Among the current secondary batteries, lithium-ion batteries have unique advantages such as high working voltage, high energy density, long cycle life, low self-discharge, no memory effect, no pollution, and good safety performance, so they have been widely used and promoted. . However, limited by the technical level of power batteries, the cruising range of commercial pure electric vehicles is generally less than 200 kilometers, and consumers have serious "mileage anxiety" about them. Mileage can allow consumers to drive freely. To solve this problem, it is necessary to develop power batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 高玉仙陈方徐平红
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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