Preparation method of cobaltous oxide coated ternary anode material

A cathode material and cobalt oxide technology, which is applied in the field of preparation of cobalt oxide-coated ternary cathode materials, can solve problems such as poor processing performance, increased alkalinity of high-capacity ternary cathode materials, and material structure collapse.

Inactive Publication Date: 2017-03-22
WUXI JEWEL POWER & MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above-mentioned technical problems, the purpose of the present invention is to provide a method for preparing a cobalt oxide-coated ternary positive electrode material, which solves the corresponding increase in the alkalinity of the existing high-capacity ternary positive electrode material as the Ni content increases, and the resulting Poor processing performance, gas production caused by high-nickel materials, collapse or destruction of the material's own structure, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for preparing a cobalt oxide-coated ternary positive electrode material, comprising the following steps:

[0020] NiSO 4 、CoSO 4 , MnSO 4 Dissolve in a certain amount of deionized water according to the molar ratio Ni:Co:Mn=7:1:2, and configure a mixed salt solution with a total concentration of metal ions of 1mol / L. Configure 2mol / L NaOH solution, and use a metering pump to input the NaOH solution into the mixed salt solution at a constant speed of 50mL / min for reaction. After complete addition, seal the reaction vessel, continue to stir and react at normal pressure and 30°C for 10h to obtain a co-precipitation reaction mixture, after solid-liquid separation, wash 3 times with deionized water, and vacuum-dry the filtrate at 120°C for 12h to obtain Ternary cathode material precursor.

[0021] LiOH·H 2 After O was vacuum-dried at 120°C for 5 hours, it was mixed with the precursor of the ternary cathode material in a mixer for 3 hours at a ratio of molar rat...

Embodiment 2

[0026] A preparation method of a cobalt oxide-coated ternary positive electrode material, the difference from Example 1 is that the cobalt oxide coating amount is the molar ratio Co: Li(Ni x co y mn 1-x-y )O 2 =0.04:1, other conditions are the same.

[0027] The cobalt oxide-coated high-capacity ternary positive electrode material obtained in this example was subjected to physical and chemical indicators, CR2016 button battery (3.0-4.3V, 0.2C charge and discharge) and 355071 soft-pack lithium-ion battery (3.0- 4.2V, 0.5C charge and discharge) test to study the comprehensive performance of the cathode material of the present invention.

[0028] Among them, the pH is 11.5; the test discharge capacity of the button battery is 186.0mAh / g, and the coulombic efficiency of the first charge and discharge is 85.8%; the test discharge capacity of the soft-packed lithium-ion battery is 179.2mAh / g; the inflation rate after high-temperature storage at 85°C / 4h was 16.5%.

Embodiment 3

[0030] A preparation method of a cobalt oxide-coated ternary positive electrode material, the difference from Example 1 is that the cobalt oxide coating amount is the molar ratio Co: Li(Ni x co y mn 1-x-y )O 2 =0.05:1, other conditions are the same.

[0031] The cobalt oxide-coated high-capacity ternary positive electrode material obtained in this example was subjected to physical and chemical indicators, CR2016 button battery (3.0-4.3V, 0.2C charge and discharge) and 355071 soft-pack lithium-ion battery (3.0- 4.2V, 0.5C charge and discharge) test to study the comprehensive performance of the cathode material of the present invention.

[0032] Among them, the pH is 11.42; the test discharge capacity of the button battery is 187.5mAh / g, and the coulombic efficiency of the first charge and discharge is 86.6%; the test discharge capacity of the soft-packed lithium-ion battery is 180.8mAh / g; the inflation rate after high temperature storage at 85°C / 4h was 8.7%.

[0033] From ...

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PUM

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Abstract

The invention belongs to the field of lithium ion batteries, and particularly relates to a preparation method of a cobaltous oxide coated ternary anode material. The cobaltous oxide coated ternary anode material is prepared through the steps of coprecipitation synthesis of a ternary anode material precursor, high-temperature sintering preparation of the ternary anode material, nanometer cobaltous oxide solid-phase coating and the like, so that the content of residual alkali on the surface of the anode material is reduced, the cycle performance and high-temperature safety performance are improved, and the preparation method is simple and practical and is high in practicability and universality.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a preparation method of a cobalt oxide-coated ternary positive electrode material. Background technique [0002] In recent years, power lithium-ion batteries have been greatly developed, and higher requirements have been put forward for their energy density and safety performance. There are two main ways to increase the energy density: 1) by increasing the charging upper limit voltage and optimizing the positive and negative electrode materials, thereby increasing the discharge capacity or mass energy density; 2) increasing the compaction density of the material to increase the volumetric energy density of the battery. The positive electrode material is the core key material of lithium-ion batteries. It is the bottleneck that hinders the improvement of the energy density of lithium-ion batteries. It is also an important determinant of the safety performance and ma...

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
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 唐朝辉马岩华钱飞鹏赵春阳
Owner WUXI JEWEL POWER & MATERIALS
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