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A kind of positive electrode material of lithium ion battery and its preparation method and application

A technology for lithium ion batteries and positive electrode materials, which is applied in the field of positive electrode materials for lithium ion batteries and their preparation, can solve the problems affecting material processing performance and electrochemical performance, reducing structural stability, increasing interface impedance, etc., so as to increase processing performance and Electrochemical performance, improve stress concentration problem, reduce the effect of contact

Active Publication Date: 2020-11-10
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Compared with conventional ternary materials LNCM111 and LNCM523, LNCM622 has a higher specific capacity, and the energy density of batteries made with it can reach more than 230Wh / kg. However, there are also some problems with LNCM622 materials. One of the most important reasons is that it is highly alkaline and the slurry It is very easy to cause jelly after absorbing water, which will affect the processing performance and electrochemical performance of the material, and the high pH value will easily cause the cell to be flattened. The cycle stability of LNCM622 under high temperature and high voltage is not good. During the cycle, the material will be The electrolyte is corroded, causing the dissolution of metal ions, increasing the interface impedance, reducing the structural stability, and deteriorating the cycle performance

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  • A kind of positive electrode material of lithium ion battery and its preparation method and application

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Embodiment 1

[0031] In this embodiment, the preparation of lithium-ion battery cathode material-modified LNCM622 comprises the following steps:

[0032] S1. Preparation of LNCM622 precursor: Weigh lithium carbonate, nickel sulfate, cobalt acetate, and manganese sulfate according to the molar ratio of Li:Ni:Co:Mn elements of 10.1:6:2:2, and then add it to isopropanol for ball milling dispersion 2h to prepare the first slurry, the solid content of the first slurry is 20%, the obtained first slurry is ground after vacuum drying at 80°C, and then pre-fired under an air atmosphere of 450°C for 2h, Finally, natural cooling was used to obtain the pure-phase LNCM622 precursor;

[0033] S2, PbO, NiNb 2 o 6 and TiO 2 Add polyvinyl alcohol in a molar ratio of 1:0.2:0.4 and mix to form a mixture, then mix the mixture with LNCM622 precursor and isopropanol to obtain a second slurry, the solid content of the second slurry is 10%, and then Perform ball mill dispersion for 2 hours, and then vacuum dry...

Embodiment 2

[0037] In this embodiment, the preparation of lithium-ion battery cathode material-modified LNCM622 comprises the following steps:

[0038] S1. Preparation of LNCM622 precursor: Weigh lithium nitrate, nickel chloride, cobalt nitrate, and manganese nitrate according to the molar ratio of Li:Ni:Co:Mn elements of 10.2:6:2:2, and add them to absolute ethanol for ball milling Disperse for 2 hours to prepare the first slurry. The solid content of the first slurry is 50%. The obtained slurry is vacuum-dried at 90°C and then ground, then pre-fired in an oxygen atmosphere at 500°C for 3 hours, and finally cooled naturally Obtain a pure phase LNCM622 precursor;

[0039] S2, PbO, NiNb 2 o 6 and TiO 2 Add polyvinyl alcohol in a molar ratio of 1:0.2:0.4 and mix to form a mixture, then mix the mixture with LNCM622 precursor and isopropanol to obtain a second slurry, the solid content of the second slurry is 50%, and then Perform ball mill dispersion for 4 hours, and then vacuum dry at 1...

Embodiment 3

[0043] In this embodiment, the preparation of lithium-ion battery cathode material-modified LNCM622 comprises the following steps:

[0044] S1. Preparation of LNCM622 precursor: Weigh lithium hydroxide, nickel chloride, cobalt chloride, and manganese sulfate according to the molar ratio of Li:Ni:Co:Mn elements of 10.3:6:2:2, then add acetone for ball mill dispersion The first slurry was prepared in 2 hours, the solid content of the first slurry was 40%, the obtained slurry was vacuum-dried at 95°C and then ground, then pre-fired in an oxygen atmosphere at 550°C for 4 hours, and finally cooled naturally to obtain Pure phase LNCM622 precursor;

[0045] S2, PbO, NiNb 2 o 6 and TiO 2 Add polyvinyl alcohol in a molar ratio of 1:0.2:0.4 and mix to form a mixture, then mix the mixture with LNCM622 precursor and acetone to obtain a second slurry, the solid content of the second slurry is 30%, and then ball mill Disperse for 5 hours, then vacuum dry at 110°C to obtain a dry materia...

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Abstract

The invention discloses a lithium ion battery positive electrode material and a preparation method and application thereof. The lithium ion battery positive electrode material comprises an LNCM622 (LiNi0. 6Co0. 2Mn0. 2O2) positive electrode material, a coating layer is arranged on the surface of the LNCM622 positive electrode material, and the coating layer is 0.6 Pb (Ni1 / 3Nb2 / 3) O3-0. 4PbTiO2. A0.6 Pb (Ni1 / 3Nb2 / 3) O3-0.4PbTiO2 compound is adopted to coat an LNCM622 positive electrode material, and the LNCM622 positive electrode material is obtained. A 0.6 Pb (Ni1 / 3Nb2 / 3) O3-0.4PbTiO2 compound coating layer is used for enhancing the structural stability of the LNCM622 material; the contact between the material and the electrolyte is reduced, the corrosion is reduced, the interface impedance is reduced, and the technical problems that the surface alkalinity of the LNCM622 is large and the material is easily corroded by the electrolyte in the prior art are solved.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery cathode materials, and in particular relates to a lithium-ion battery cathode material and a preparation method and application thereof. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on lithium ions to move between positive and negative electrodes to work. During the charging and discharging process, Li + intercalation and extraction back and forth between the two electrodes: when charged, the Li + It is released from the positive electrode and inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. With the reduction of the supply of fossil fuel resources and the intensification of environmental degradation caused by excessive emissions of greenhouse gases, the research and development of new renewable green and clean energy i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/525H01M10/0525
CPCH01M4/366H01M4/485H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 刘兴亮杨茂萍夏昕李道聪陈厚梅
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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