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Composite lithium ion battery ternary cathode material and preparation method thereof

A technology for positive electrode materials and ion batteries, which is applied in the direction of battery electrodes, positive electrodes, electrical components, etc., can solve the problems of poor coating uniformity of ternary positive electrode materials, poor high-temperature cycle performance, and complex coating process, etc., and achieve excellent volumetric energy Density, improvement of processability, effect of avoiding volume change

Active Publication Date: 2017-08-29
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art, to provide a composite lithium-ion battery ternary positive electrode material and its preparation method, aiming to solve the problem of poor high-temperature cycle performance and unsafety of the existing ternary positive electrode materials, and the ternary positive electrode materials Problems such as poor coating uniformity, complex coating process, and high cost

Method used

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  • Composite lithium ion battery ternary cathode material and preparation method thereof
  • Composite lithium ion battery ternary cathode material and preparation method thereof
  • Composite lithium ion battery ternary cathode material and preparation method thereof

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preparation example Construction

[0027] On the other hand, the embodiment of the present invention also provides a method for preparing the above-mentioned ternary positive electrode material for a composite lithium-ion battery. This preparation method comprises the steps:

[0028] S01: According to the general formula Li of nickel-cobalt-manganese ternary cathode material m Ni 1-x-y mn xco y o 2 In the molar ratio, nickel-cobalt-manganese intermediates and lithium sources are obtained, wherein, 0.98≤m≤1.10, 0.2≤x≤0.25, 0.2≤y≤0.25;

[0029] S02: performing the first mixing treatment on the nickel-cobalt-manganese intermediate and the lithium source to obtain the first mixture;

[0030] S03: heating the above-mentioned first mixture to 850-1000°C at a heating rate of 1-5°C / min, keeping it warm for 4-24h, and performing a second mixing treatment with an organoaluminum alcoholate after cooling to obtain a second mixture;

[0031] S04: After performing the third mixing treatment on the above-mentioned secon...

Embodiment 1

[0040] A composite lithium-ion battery ternary positive electrode material, comprising a nickel-cobalt-manganese ternary positive electrode material as an inner core and a cladding layer covering the nickel-cobalt-manganese ternary positive electrode material; the general formula of the nickel-cobalt-manganese ternary positive electrode material is Li 0.98 Ni 0.6 mn 0.2 co 0.2 o 2 , the cladding layer consists of Al 2 o 3 and LiAlO 2 composition. The preparation method of the composite lithium-ion battery ternary cathode material is as follows:

[0041] S11: Accurately weigh nickel-cobalt-manganese hydroxide (wherein the molar ratio of Ni:Mn:Co is 6:2:2) and lithium carbonate according to the molar ratio of Li / (Ni+Co+Mn)=0.98.

[0042] S12: Mix nickel-cobalt-manganese hydroxide and lithium carbonate in a ball mill for 0.1 hour.

[0043] S13: Put the mixed powder obtained in step S12 into a high-temperature furnace, heat up to 850°C at a heating rate of 1°C / min, keep wa...

Embodiment 2

[0048] A composite lithium-ion battery ternary positive electrode material, comprising a nickel-cobalt-manganese ternary positive electrode material as an inner core and a cladding layer covering the nickel-cobalt-manganese ternary positive electrode material; the general formula of the nickel-cobalt-manganese ternary positive electrode material is Li 1.10 Ni 0.55 mn 0.25 co 0.20 o 2 , the cladding layer consists of Al 2 o 3 and LiAlO 2 composition. The preparation method of the composite lithium-ion battery ternary cathode material is as follows:

[0049] S21: Accurately weigh nickel-cobalt-manganese carbonate (wherein the molar ratio of Ni:Mn:Co is 55:25:20) and lithium hydroxide according to the molar ratio of Li / (Ni+Co+Mn)=1.10.

[0050] S22: Mix nickel-cobalt-manganese carbonate and lithium hydroxide in a high-speed mixer for 4 hours.

[0051] S23: Put the mixed powder obtained in step S22 into a high-temperature furnace, heat up to 1000°C at a heating rate of 5°C...

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Abstract

The invention belongs to the technical field of lithium ion batteries, and especially relates to a composite lithium ion battery ternary cathode material and a preparation method thereof. The composite lithium ion battery ternary cathode material includes a Ni-Co-Mn ternary cathode material as a core and a cladding layer that coats the Ni-Co-Mn ternary cathode material. The characteristic general formula of the Ni-Co-Mn ternary cathode material is Li<m>Ni<1-x-y>Mn<x>Co<y>O2, 0.98 <= m <= 1.10, 0.2 <= x <= 0.25 and 0.2 <= y <= 0.25; the cladding layer is composed of Al2O3 and LiAlO2. The composite lithium ion battery ternary cathode material has high volume energy density and has better cycle performance at high temperature and high rate. In the preparation, organic aluminum alcoholate serves as an aluminum source and is firstly uniformly mixed with a cathode material; and then water is added to initiate the reaction to produce the ternary cathode material. The preparation method is simple and low-cost and has good cladding effect.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a composite lithium ion battery ternary cathode material and a preparation method thereof. Background technique [0002] Lithium-ion batteries have no memory effect, have the advantages of small self-discharge, wide operating temperature range, high energy density and environmental protection, and can be widely used in various mobile electronic devices, power tools, environmentally friendly electric vehicles, UPS power supplies and other fields. In lithium-ion batteries, the cathode material is an important core component that affects the performance of the battery. The commonly used cathode materials mainly include LiCoO 2 , LiNi 1-X-Y mn X co Y o 2 , LiMn 2 o 4 , LiFePO 4 Wait. In the field of power (electric vehicles, electric aircraft, etc.), the volume energy density of positive electrode materials is relatively high, and LiCoO 2 、LiNi 1-X...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/62H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 许开华郑宏伟
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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