Surface coating modification method for ternary positive electrode material of lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, positive electrodes, electrical components, etc., can solve problems such as limited performance improvement, by-product pollution of the environment, and fast performance decay, achieving fewer deposition cycles and rapid large-scale The effect of short production and reaction time

Pending Publication Date: 2021-10-08
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-ion battery cathode material has low specific capacity and fast performance decay, which seriously restricts the development of lithium-ion batteries.
Ternary cathode materials, especially high-nickel ternary cathode materials, due to the synergistic effect of nickel, cobalt, and manganese, have higher capacity, better cycle performance, and moderate price than other cathode materials. Density is an important material, but there are still many problems in the ternary cathode material: for example, it is easy to have side reactions with the electrolyte, resulting in the recons...

Method used

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  • Surface coating modification method for ternary positive electrode material of lithium ion battery
  • Surface coating modification method for ternary positive electrode material of lithium ion battery
  • Surface coating modification method for ternary positive electrode material of lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Put the prepared lithium-ion battery NCM811 electrode sheet into the chamber of the atomic deposition system, and the reaction temperature is 110°C. Use nitrogen as a carrier gas to pass trimethylaluminum into the cavity for 0.02s, exposure time is 8s, nitrogen purge time is 25s, deionized water is introduced for 0.1s, exposure time is 8s, nitrogen purge The time is 40s. The oxygen source reacts with the aluminum source adsorbed on the surface of the positive electrode to generate alumina. This is a cycle. If this cycle is repeated 10 times, a certain thickness of aluminum oxide protective film layer (denoted as AO-10) is deposited on the electrode. ).

Embodiment 2

[0044] Put the prepared lithium-ion battery NCM811 electrode sheet into the chamber of the atomic deposition system, and the reaction temperature is 110°C. Use nitrogen as a carrier gas to pass trimethylaluminum into the cavity for 0.02s, exposure time is 8s, nitrogen purge time is 20s, deionized water is introduced for 0.1s, exposure time is 8s, nitrogen purge The time is 40s. The oxygen source reacts with the aluminum source adsorbed on the surface of the positive electrode to form alumina. This is a cycle. If the cycle is repeated 10 times, a certain thickness of aluminum oxide protective film is deposited on the electrode.

Embodiment 3

[0046]Put the prepared lithium-ion battery NCM811 electrode sheet into the chamber of the atomic deposition system, and the reaction temperature is 110°C. Use nitrogen as the carrier gas to pass trimethylaluminum into the cavity for 0.02s, exposure time is 8s, nitrogen purge time is 30s, deionized water is introduced for 0.1s, exposure time is 8s, nitrogen purge The time is 40s. The oxygen source reacts with the aluminum source adsorbed on the surface of the positive electrode to form alumina. This is a cycle. If the cycle is repeated 10 times, a certain thickness of aluminum oxide protective film is deposited on the electrode.

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Abstract

The invention discloses a surface coating modification method for a ternary positive electrode material of a lithium ion battery, and belongs to the field of positive electrode materials of lithium ion batteries. The method comprises the following steps: sequentially loading an aluminum source and an oxygen source onto the surface of a ternary positive electrode plate of the lithium ion battery by using carrier gas by utilizing an atomic deposition system: adsorbing a layer of aluminum source on the surface of the ternary positive electrode plate of the lithium ion battery, and then carrying out combination reaction on the oxygen source and the adsorbed layer of aluminum source to generate an aluminum oxide layer; repeating the cycle number of the aluminum oxide layer, namely depositing an aluminum oxide film on the surface of the ternary positive electrode plate of the lithium ion battery, so as to realize coating modification on the surface of the ternary positive electrode material of the lithium ion battery. The surface coating modification method for the ternary positive electrode material of the lithium ion battery is short in preparation period, safe and simple in method, low in energy consumption, simple in required equipment and suitable for modification of various ternary positive electrode materials.

Description

technical field [0001] The invention belongs to the field of positive electrode materials of lithium ion batteries, and in particular relates to a surface coating modification method of ternary positive electrode materials of lithium ion batteries. Background technique [0002] With the massive consumption of fossil fuels, human beings are facing unprecedented energy crisis and environmental pollution. Lithium-ion batteries are widely used in all aspects of human life due to their high energy density, long cycle life, and environmental protection. However, the specific capacity of the cathode material of lithium-ion batteries is low, and the performance decays quickly, which seriously restricts the development of lithium-ion batteries. Ternary cathode materials, especially high-nickel ternary cathode materials, due to the synergistic effect of nickel, cobalt, and manganese, have higher capacity, better cycle performance, and moderate price than other cathode materials. Den...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 苏庆梅王黎明杜高辉许并社
Owner SHAANXI UNIV OF SCI & TECH
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