LiAlTi(PO4)3 Coated Lithium Battery Positive Electrode
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Solution Overview
Problem
Rechargeable lithium batteries face challenges with maintaining high-rate charge and discharge characteristics and cycle-life due to side reactions with electrolytes, leading to instability during high-rate charge and discharge processes.
Innovation Solution
A positive electrode for rechargeable lithium batteries is developed, featuring a current collector, a positive active material layer, and a coating layer containing a compound represented by Chemical Formula LiaAlbTic(PO4)d, which prevents direct contact with the electrolyte, enhancing electrochemical performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If composite metal oxide positive active materials are used to achieve high charge capacity and battery voltage, then energy density is improved, but side reactions with electrolyte occur leading to poor stability during high-rate charge and discharge
Solution Approach 1:
A coating layer comprising LiAlTi(PO4)3 is applied on the surface of the positive active material particles. This coating layer acts as an intermediary barrier between the positive active material and the electrolyte, preventing direct contact and side reactions while allowing lithium ion diffusion, thus improving stability during high-rate charge and discharge without sacrificing energy density
Solution Approach 2:
The patent uses composite metal oxide materials such as LiCo1-xNixO2, LiCo1-xMnxO2, or LiCo1-x-yNixMnyO2 as the positive active material, combining multiple metal elements to achieve a balance between high charge capacity, battery voltage, and improved structural stability, thereby maintaining high energy density while reducing side reactions with electrolyte
2Use of energy by moving object
If LiCoO2 is used as positive active material to achieve high battery voltage and excellent electrode characteristics, then energy density is improved, but stability during high-rate charge and discharge deteriorates
Solution Approach 1:
The LiAlTi(PO4)3 coating layer serves as a protective intermediary that prevents direct interaction between LiCoO2 and the electrolyte, suppressing side reactions and improving stability during high-rate charge and discharge while maintaining the high battery voltage characteristics of LiCoO2
Solution Approach 2:
The patent optimizes the coating thickness to 0.1 to 1 part by weight based on 100 parts by weight of the positive active material layer, ensuring sufficient protection without excessive thickness that would impede lithium ion diffusion, thus maintaining high battery voltage and excellent electrode characteristics while improving stability
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 solution achieves excellent high-rate charge and discharge characteristics and cycle-life performance, maximizing discharge capacity and ensuring high safety and stability at high temperatures and voltages.
Implementation Method 1
a coating layer disposed on the positive active material layer, wherein the coating layer includes a compound represented by Chemical Formula 1
Implementation Method 2
materials for negative and positive electrodes that intercalate or deintercalate lithium ions
Data Source
AI summary
In an aspect, a positive electrode for a rechargeable lithium battery including a current collector, a positive active material layer disposed on the current collector, and a coating layer disposed on the positive active material layer is disclosed.