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A preparation method of a high-nickel ternary material with a transition metal element concentration gradient and the prepared material

A transition metal element, concentration gradient technology, used in electrical components, structural parts, battery electrodes, etc., can solve the problems of abnormal growth of primary particles, interdiffusion of transition metal elements, etc., to improve cycle performance, thermal stability, crystallization, etc. Good, the effect of suppressing abnormal growth

Active Publication Date: 2021-05-11
CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved in the present invention is to overcome the problems of abnormal primary particle growth and interdiffusion of transition metal elements in the current gradient precursor in the roasting process after lithium matching, and propose to use multi-stage roasting method, the low temperature section is long and the high temperature section is short The solution combined with time realizes a preparation method of high-nickel ternary cathode material with transition metal element concentration gradient with high capacity and good stability

Method used

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  • A preparation method of a high-nickel ternary material with a transition metal element concentration gradient and the prepared material
  • A preparation method of a high-nickel ternary material with a transition metal element concentration gradient and the prepared material
  • A preparation method of a high-nickel ternary material with a transition metal element concentration gradient and the prepared material

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Embodiment 1

[0030] The high-nickel ternary material with transition metal element concentration gradient of this embodiment, its precursor core chemical composition is Ni 0.83 co 0.12 mn 0.05 (OH) 2 , the chemical composition of the shell is Ni 0.5 co 0.2 mn 0.3 (OH) 2 , in this embodiment, the core-shell structure of the precursor is the method of high-speed mechanical fusion to crush Ni 0.5 co 0.2 mn 0.3 (OH) 2 Tightly coated with Ni 0.83 co 0.12 mn 0.05 (OH) 2 Formed above, the precursor core / shell mass ratio is 10:1, and the average chemical composition of the final precursor is Ni 0.800 co 0.127 mn 0.073 (OH) 2 .

[0031] Its preparation method is:

[0032] Step 1. Prepare the mixture: Ni according to the molecular formula 0.800 co 0.127 mn 0.073 (OH) 2 , calculate its molar ratio of 1:1 LiOH·H 2 The mass ratio of O. The above precursors were mixed with 3% LiOH·H 2O is added into the mixing material tank and fully mixed and stirred until uniform to obtain the...

Embodiment 2

[0036] The high-nickel ternary material with transition metal element concentration gradient of this embodiment, its precursor core chemical composition is Ni 0.95 co 0.025 mn 0.025 (OH) 2 , the contents of Ni, Co, and Mn elements gradually change from the core to the outside, until the composition is Ni 0.8 co 0.1 mn 0.1 (OH) 2 , and Ni 0.5 co 0.2 mn 0.3 (OH) 2 In this example, the gradient structure precursor is prepared by the co-precipitation method, and the core-shell structure is obtained by crushing Ni after high-speed mechanical fusion 0.5 co 0.2 mn 0.3 (OH) 2 It is formed by tightly covering the gradient precursor, the core / shell mass ratio is 10:1, and the average chemical composition of the final precursor is Ni 0.875 co 0.050 mn 0.075 (OH) 2 .

[0037] Its preparation method is:

[0038] Step 1. Precursor modification: the above Ni 0.875 co 0.050 mn 0.075 (OH) 2 Precursor with 0.5% nano-additive ZrO 2 Mixing and performing high-speed mechanic...

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Abstract

A method for preparing a high-nickel ternary positive electrode material with a transition metal element concentration gradient, characterized in that the preparation method first performs high-speed mechanical fusion of a precursor with a core-shell structure or an element concentration gradient structure and an additive, and then oxidizes it with hydrogen Lithium is mixed, and a high-nickel ternary positive electrode material with a gradient distribution of transition metal elements is prepared by controlling particle growth and element diffusion during the calcination process. The parameters in the roasting process are optimized to achieve the purpose of suppressing the abnormal growth of primary particles and interdiffusion of transition metal elements.

Description

technical field [0001] The invention relates to the technical field of high-nickel materials, in particular to a method for preparing a high-nickel ternary material with a transition metal element concentration gradient and the prepared material. Background technique [0002] With the continuous development of the new energy vehicle industry, consumers' demand for cruising range is increasing. Since increasing the nickel content in the transition metal elements of the ternary positive electrode material can significantly increase the energy density of lithium-ion batteries, the introduction of high specific energy and high nickel ternary layered oxide materials into power batteries has been significantly accelerated in recent years. [0003] However, the degradation of material cycle performance caused by the increase of nickel content limits the development of high-nickel materials. High-valent nickel ions Ni on the surface of the positive active material 4+ On the one ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 徐国峰李宁王刘振
Owner CHINA AUTOMOTIVE BATTERY RES INST CO LTD
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