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Aluminum-coated positive electrode material capable of inhibiting oxygen release and battery comprising aluminum-coated positive electrode material

A positive electrode material and aluminum coating technology, which is applied to the field of aluminum coated positive electrode materials and batteries including the same, can solve the problems of increasing the impedance of the positive electrode sheet, decreasing the cycle performance of the battery, and the coating material being unable to achieve an ideal coating effect, etc. Achieve the effect of extending cycle life, improving ionic conductivity, and reducing the risk of thermal runaway

Active Publication Date: 2021-10-19
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, in the current coating scheme, the coating material still cannot achieve the ideal coating effect, which will increase the impedance of the positive electrode sheet and decrease the battery cycle performance. It is necessary to consider the comprehensive performance of the cladding material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] This embodiment provides an aluminum-coated positive electrode material. The aluminum-coated positive electrode material includes positive electrode active particles and an aluminum layer coated on the surface of the positive electrode active particles, wherein the chemical formula of the positive electrode active particles is LiNiCoMnO 2 , the coating amount of the aluminum layer is 0.05wt%, and the thickness of the aluminum layer is 1nm.

[0041] This embodiment also provides a method for preparing the above-mentioned aluminum-coated positive electrode material. The preparation method specifically includes the following steps:

[0042] (1) After grinding and dispersing the aluminum powder and ethanol, dry it in vacuum at 80°C;

[0043] (2) Aluminum powder and LiNiCoMnO 2 After the positive active particles are mixed, carry out mechanical stirring, the mixing time is 5min, the rotating speed of mechanical stirring is 4000rpm, based on the total mass fraction of alumin...

Embodiment 2

[0047] This embodiment provides an aluminum-coated positive electrode material. The aluminum-coated positive electrode material includes positive electrode active particles and an aluminum layer coated on the surface of the positive electrode active particles, wherein the chemical formula of the positive electrode active particles is LiNi 0.4 co 0.2 mn 0.4 o 2 , the coating amount of the aluminum layer is 0.3wt%, and the thickness of the aluminum layer is 2.3nm.

[0048] This embodiment also provides a method for preparing the above-mentioned aluminum-coated positive electrode material. The preparation method specifically includes the following steps:

[0049] (1) After grinding and dispersing the aluminum powder and ethanol, dry it in vacuum at 80°C;

[0050] (2) Aluminum powder and LiNi 0.4 co 0.2 mn 0.4 o 2 After the positive active particles are mixed, carry out mechanical stirring, the mixing time is 10min, the rotating speed of mechanical stirring is 3000rpm, base...

Embodiment 3

[0054] This embodiment provides an aluminum-coated positive electrode material. The aluminum-coated positive electrode material includes positive electrode active particles and an aluminum layer coated on the surface of the positive electrode active particles, wherein the chemical formula of the positive electrode active particles is LiNi 0.3 co 0.3 mn 0.3 o 2 , the coating amount of the aluminum layer is 1wt%, and the thickness of the aluminum layer is 5.9nm.

[0055] This embodiment also provides a method for preparing the above-mentioned aluminum-coated positive electrode material. The preparation method specifically includes the following steps:

[0056] (1) After grinding and dispersing the aluminum powder and ethanol, dry it in vacuum at 80°C;

[0057] (2) Aluminum powder and LiNi 0.3 co 0.3 mn 0.3 o 2 After the positive active particles are mixed, carry out mechanical stirring, the mixing time is 15min, the rotating speed of mechanical stirring is 2000rpm, based ...

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Abstract

The invention provides an aluminum-coated positive electrode material capable of inhibiting oxygen release and a battery comprising the aluminum-coated positive electrode material. The aluminum-coated positive electrode material comprises positive electrode active particles and an aluminum layer coated on the surfaces of the positive electrode active particles. According to the invention, the surface of the positive active particle is coated with the aluminum layer, and by utilizing the reducibility of the metal simple substance aluminum, when the battery is in thermal runaway, the positive active particle is decomposed to release oxygen, and the metal simple substance aluminum coated on the positive active particle can reduce oxygen to form a metal oxide, namely, aluminum oxide; the ignition of the combustible electrolyte under the condition that the released oxygen accumulates heat is avoided, and the risk of thermal runaway of the battery is effectively reduced. The metal simple substance aluminum has high electrical conductivity, the electrical conductivity of the positive electrode material can be improved, meanwhile, aluminum oxide is generated after the metal simple substance aluminum absorbs oxygen, the aluminum oxide is gradually lithiated in the charging and discharging process to form a fast ion conductor, the ionic conductivity of the positive electrode is improved, and the cycle life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials, and relates to an aluminum-coated positive electrode material that suppresses oxygen release and a battery comprising the same. Background technique [0002] With the rapid development of the new energy vehicle market, lithium batteries have been widely used. People have put forward higher requirements for the endurance and safety performance of lithium-ion batteries. In order to meet the high endurance requirements, it is necessary to increase the energy density of the battery. High-nickel ternary cathode materials are low in cost, high in energy density, and high in voltage platform. Advantages are favored, and high-energy-density lithium-ion batteries (LIBs) have become the key to promoting next-generation sustainable energy technologies. At present, there are two main ways to increase the energy density, which is to increase the capacity of the electrode material or to i...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/62H01M10/0525C23C26/02
CPCH01M4/62H01M4/626H01M4/628H01M10/0525H01M4/366C23C26/02H01M2004/028H01M2220/20Y02E60/10
Inventor 郑晓醒江卫军李子郯陈思贤许鑫培杨红新
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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