MgAlO2 Coated Lithium Battery Electrode Active Material
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Solution Overview
Problem
Lithium secondary batteries face a decrease in lifespan due to irreversible reactions between the electrolytic solution and active materials during charging and discharging, leading to unsatisfactory life span characteristics and thermal stability.
Innovation Solution
An electrode active material with a magnesium aluminum oxide (MgAlO2) coating layer is applied to the core active material, enhancing thermal stability and lifespan by forming specific binding energy peaks measured by X-ray photoelectron spectroscopy, and a heat treatment process is used to form the coating layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coating layer is applied to protect the core active material from electrolytic solution, then thermal stability and lifespan are improved, but ion conduction properties may deteriorate
Solution Approach 1:
The patent uses composite materials by forming a MgAlO3 coating layer with spinel structure on the core active material surface. This composite structure combines the protective properties of the oxide coating with the ion-conducting properties of the spinel phase, achieving both protection and conductivity
2Temperature
If heat treatment is performed to form the coating layer, then thermal stability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies preliminary action by first coating the core active material with aluminum oxide before heat treatment. This pre-coating step prepares the surface for subsequent spinel formation during heat treatment, ensuring uniform distribution of Mg and Al elements
Solution Approach 2:
The patent utilizes phase transitions by heating the aluminum oxide-coated material at 300-1000°C to transform it into a spinel-structured MgAlO3 coating layer. This phase transition creates the desired crystal structure with improved thermal stability and ion conduction properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The electrode active material with a MgAlO2 coating layer improves the lifespan and thermal stability of lithium secondary batteries by protecting the core active material from electrolytic solutions and maintaining excellent ion conduction properties.
Implementation Method 1
a coating layer including magnesium aluminum oxide (MgAlO2) and formed on the core active material
Implementation Method 2
performing a heat treatment on the core active material which has the aluminum oxide (Al2O3) coating layer. The heat treatment is performed at a temperature range of about 300° C. to about 1000° C.
Implementation Method 3
maintaining excellent ion conduction properties
Data Source
AI summary
An electrode active material for a lithium secondary battery, a method of preparing the electrode active material, an electrode for a lithium secondary battery which includes the same, a lithium secondary battery using the electrode. The electrode active material includes a core active material and a coating layer including magnesium aluminum oxide (MgAlO2) and formed on the core active material. 1s binding energy peaks of oxygen (O) in the electrode active material measured by x-ray photoelectron spectroscopy (XPS) are shown at positions corresponding to 529.4±0.5 eV, about 530.7 eV, and 531.9±0.5 eV, and a peak intensity at the position corresponding to 529.4±0.5 eV is stronger than a peak intensity at the position corresponding to about 530.7 eV.