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Layered quaternary cobalt-free single crystal precursor and preparation method of positive electrode material

A positive electrode material and precursor technology, applied in the field of lithium-ion battery materials, can solve the problems of battery capacity reduction, uneven coating, etc., and achieve the effect of maintaining stability, improving structural stability, and good layered structure

Pending Publication Date: 2022-07-05
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as common bulk phase doping and surface coating, but these modification methods more or less solve part of the problem, but doping can easily lead to a decrease in battery capacity, while coating modification has the problem of uneven coating

Method used

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  • Layered quaternary cobalt-free single crystal precursor and preparation method of positive electrode material
  • Layered quaternary cobalt-free single crystal precursor and preparation method of positive electrode material
  • Layered quaternary cobalt-free single crystal precursor and preparation method of positive electrode material

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Embodiment 1

[0030] The chemical formula of the layered quaternary cobalt-free single crystal cathode material in this embodiment is LiNi 0.90 Mn 0.06Ce 0.01 Zr 0.03 O 2 .

[0031] The preparation method of the layered quaternary cobalt-free single crystal positive electrode material of the present embodiment includes the following steps:

[0032] (1) Nickel sulfate, manganese sulfate are added in deionized water in a molar ratio of 0.93:0.07, stirred uniformly, and mixed with a mixed salt solution A of 4mol / L; Nickel sulfate, manganese sulfate, cerium sulfate, zirconium sulfate are added in a molar ratio of 0.88 : 0.06: 0.02: 0.04 Add in deionized water, stir well, and prepare 4mol / L mixed salt solution B;

[0033] (2) the mixed salt solution A obtained in step (1), and the precipitant NaOH solution of 6mol / L and the complexing agent NH of 8mol / L 3 ·H 2 The O solution was added to the reaction kettle together to carry out co-precipitation reaction, and the temperature of the reacti...

Embodiment 2

[0040] The chemical formula of the layered quaternary cobalt-free single crystal cathode material in this embodiment is LiNi 0.83 Mn 0.10 Ce 0.03 Zr 0.04 O 2 .

[0041] The preparation method of the layered quaternary cobalt-free single crystal positive electrode material of the present embodiment includes the following steps:

[0042] (1) Nickel sulfate and manganese sulfate were added to deionized water in a molar ratio of 0.9:0.1, stirred uniformly, and mixed with a mixed salt solution A of 6 mol / L; Nickel sulfate, manganese sulfate, cerium sulfate, and zirconium sulfate were added in a molar ratio of 0.8 :0.09:0.05:0.06 Add in deionized water, stir well, and prepare 6mol / L mixed salt solution B;

[0043] (2) the mixed salt solution A obtained in step (1), and the precipitant NaOH solution of 6mol / L and the complexing agent NH of 8mol / L 3 ·H 2 The O solution was added into the reaction kettle together to carry out co-precipitation reaction, and the temperature of the...

Embodiment 3

[0048] The chemical formula of the layered quaternary cobalt-free single crystal cathode material in this embodiment is LiNi 0.65 Mn 0.20 Ce 0.06 Zr 0.09 O 2 .

[0049] The preparation method of the layered quaternary cobalt-free single crystal positive electrode material of the present embodiment includes the following steps:

[0050] (1) Nickel sulfate and manganese sulfate are added to deionized water in a molar ratio of 0.75:0.25, stirred uniformly, and mixed with a mixed salt solution A of 6 mol / L; Nickel sulfate, manganese sulfate, cerium sulfate, and zirconium sulfate are added in a molar ratio of 0.6 : 0.15: 0.1: 0.15 Add in deionized water, stir well, and prepare 6mol / L mixed salt solution B;

[0051] (2) the mixed salt solution A obtained in step (1), and the precipitant NaOH solution of 6mol / L and the complexing agent NH of 8mol / L 3 ·H 2 The O solution was added into the reaction kettle together to carry out co-precipitation reaction, and the temperature of t...

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Abstract

The invention discloses a preparation method of a layered quaternary cobalt-free single crystal precursor and a positive electrode material. The chemical formula of the layered single crystal precursor is Ni < x > Mn < y > Ce < m > Zr < n > (OH) < 2 >, and the chemical formula of the single crystal positive electrode material is LiNi < x > Mn < y > Ce < m > Zr < n > O < 2 >, 1, 0lt; y is less than or equal to 0.2, 0lt; m is less than or equal to 0.2, 0lt; n < = 0.1, and x + y + m + n = 1. The layered quaternary cobalt-free single crystal precursor is prepared by adopting an industrially mature precursor preparation process. And then synthesizing the layered quaternary cobalt-free single crystal positive electrode material through a segmented high-temperature method. The layered quaternary precursor is composed of internal nickel manganese hydroxide with the size of 3-4 microns and external nickel manganese cerium zirconium hydroxide with the size of 1-1.5 microns, and is different from academic and industrial core-shell structures, and the interior of the precursor and the interior of the positive electrode material are dense. The dense layered structure and the element coordination effect improve the stability of the whole single crystal material on the bulk phase on one hand and play the coordination effect among the elements on the other hand, the cerium and zirconium on the outer layer effectively reduce side reactions, side effects caused by no cobalt are reduced, and the stability and the electrochemical performance of the single crystal material are further improved.

Description

technical field [0001] The invention relates to the field of lithium ion battery materials, mainly to a lithium ion battery positive electrode material precursor and a method for preparing the positive electrode material, in particular to a layered structure quaternary nickel manganese cerium zirconium cobalt-free single crystal ternary positive electrode material precursor and A method for preparing the positive electrode material thereof. Background technique [0002] Due to the rapid development of electric vehicles, people have put forward higher requirements for the energy density of lithium-ion batteries (LIBs), so nickel-rich layered oxides are expected to be the cathode materials for next-generation lithium-ion batteries for electric vehicles. When increasing the Ni content in the layered cathode, the structural instabilities caused by anisotropic lattice shrinkage in the deeply charged state can generate localized stress concentrations along the grain boundaries and...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525
Inventor 明磊苏石临欧星张宝
Owner CENT SOUTH UNIV
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