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Preparation of petal-layered nickel-cobalt-manganese ternary material precursor and its application as a cathode material for lithium-ion batteries

A ternary material, nickel-cobalt-manganese technology, used in battery electrodes, secondary batteries, circuits, etc., can solve problems such as unfavorable uniform mixing and affecting electrochemical performance

Active Publication Date: 2018-08-17
NORTHWEST NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the precursors of nickel-cobalt-manganese series ternary materials, the morphology is mostly particles with high sphericity. The ternary material precursors with this shape are not conducive to effective and uniform mixing with LiOH, thus affecting its electrochemical performance. , especially the capacity of Li-ion batteries

Method used

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  • Preparation of petal-layered nickel-cobalt-manganese ternary material precursor and its application as a cathode material for lithium-ion batteries
  • Preparation of petal-layered nickel-cobalt-manganese ternary material precursor and its application as a cathode material for lithium-ion batteries
  • Preparation of petal-layered nickel-cobalt-manganese ternary material precursor and its application as a cathode material for lithium-ion batteries

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Experimental program
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Embodiment 1

[0021] 1. Preparation of ternary material precursor: Accurately weigh nickel sulfate, cobalt sulfate, and manganese sulfate according to the molar ratio of elements Ni:Co:Mn=3:1:1, and dissolve them in deionized water to make 2.0mol / L Mixed solution; take 20mL of 8mol / L ammonia solution, add the mixed solution and ammonia solution to a 2L dry beaker at the same time with a peristaltic pump, adjust the pH value to 9~10 with 4.0mol / L NaOH solution; control the reaction temperature in a water bath to 60°C, react for 8h; meanwhile stir with a magnetic stirrer. The whole synthesis process uses N 2 For protective gas. After the reaction was completed, the precursor was aged for 48 hours to obtain a precursor precipitate, which was filtered under reduced pressure, washed with deionized water until the pH value was 7~8, and dried in a vacuum oven at 120°C for 24 hours to obtain a precursor with an atomic ratio of 3:1:1. Ternary material precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 , it...

Embodiment 2

[0025] 1. Preparation of ternary material precursor: Accurately weigh nickel sulfate, cobalt sulfate, and manganese sulfate according to the element molar ratio Ni:Co:Mn=1:1:1, and dissolve them in deionized water to make 2.0mol / L Mixed solution; take 20mL of 8mol / L ammonia solution, add the mixed solution and ammonia solution to a 2L dry beaker at the same time with a peristaltic pump, adjust the pH value to 9~10 with 4.0mol / L NaOH solution; control the reaction temperature to 60 by heating in a water bath ℃, reacted for 8h; while stirring with a magnetic stirrer. The whole synthesis process uses N 2 For protective gas. After the completion of the reaction, it was aged for 48 hours to obtain the precursor precipitate, which was filtered under reduced pressure, washed with deionized water until the pH value was 7~8, and dried in a vacuum oven at 120°C for 24 hours to obtain a precursor with an atomic ratio of 1:1:1. Ternary material precursor Ni 1 / 3 co 1 / 3 mn 1 / 3 (OH) 2 ...

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Abstract

The invention provides preparation of a Ni-Co-Mn ternary material precursor as a cathode material for a lithium ion cell. The preparation comprises steps as follows: a Ni<2+>, Co<2+> and Mn<2+> mixed salt solution and an ammonia water solution are uniformly mixed, then the pH value of a mixed solution is regulated to 8-11 by aqueous alkali, and reaction is performed for 6-12 h at the temperature of 50-70 DEG C under the protection of nitrogen or inert gas; the mixed solution is subjected to aging for 24-48 h after the reaction, a precursor precipitate is obtained, is subjected to pressure-reducing suction filtration and is sufficiently washed with deionized water until the pH value is 7-8, the precursor precipitate is dried, and the pedal-layered Ni-Co-Mn ternary material precursor is obtained. The pedal-layered precursor is subjected to ball milling with LiOH and then is calcinated, a ternary material is obtained and taken as the cathode material for the lithium ion cell, and the lithium ion cell has higher capacity and electrochemical performance.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and relates to the preparation of a lithium-ion battery cathode material precursor, in particular to a preparation method of a petal-layered nickel-cobalt-manganese ternary material precursor. Background technique [0002] As a new type of green energy, lithium-ion batteries have the advantages of high voltage, large theoretical specific capacity, low self-discharge rate, small mass, easy to carry, stable working voltage, long service life, green environmental protection and no pollution. Therefore, it is widely used in electric vehicles, mobile phones, computers and other fields. As an important part of lithium-ion batteries, cathode materials have a crucial influence on the electrochemical performance of lithium-ion batteries. [0003] At present, the main cathode materials for lithium-ion batteries on the market are LiCoO 2 , LiMnO 2 , LiNiO 2 and LiFePO 4 And other traditional lithiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/006H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 周小中杨菲雷自强
Owner NORTHWEST NORMAL UNIVERSITY