O2-Type Electrode Active Material With LiOH for Better Battery Cycling
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Solution Overview
Problem
Batteries using electrode active materials with an O2-type structure face challenges in improving their cycle characteristics.
Innovation Solution
The use of an electrode active material comprising O2-type Li-containing oxide and lithium hydroxide, where the O1s spectrum acquired by XPS satisfies the relationship 0.2≤S1/(S1+S2)≤0.73, optimizing the amount of lithium hydroxide to enhance battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an O2-type Li-containing oxide is used as electrode active material, then battery capacity is improved, but cycle characteristics deteriorate due to electrolyte decomposition
Solution Approach 1:
Lithium hydroxide is introduced as an intermediary substance that forms a protective interface layer between the O2-type Li-containing oxide active material and the electrolyte. This intermediate layer prevents direct contact and harmful reactions while allowing ionic transport, thus improving cycle characteristics without sacrificing capacity.
Solution Approach 2:
Lithium hydroxide is pre-formed on the surface of the active material before battery operation begins. This preliminary protective layer prevents the electrolyte from decomposing during charging, countering the harmful effect before it can occur. The pre-formed layer stabilizes the interface and prevents subsequent electrolyte decomposition.
2Reliability
If the amount of lithium hydroxide is increased to protect the active material, then cycle characteristics improve, but battery capacity decreases
Solution Approach 1:
The invention optimizes the concentration parameter of lithium hydroxide within a specific range (0.01≤x≤0.1 in the formula Li1-yLaxMn0.5Ni0.2Co0.3O2). By precisely controlling this parameter, the protective effect is maximized while minimizing the impact on capacity, resolving the trade-off between reliability and quantity of substance.
Solution Approach 2:
Instead of forming a thick uniform layer of lithium hydroxide, the invention uses a small controlled amount (partial action) that is sufficient to protect the active material surface without blocking ionic transport pathways. This optimized quantity provides protection while maintaining capacity.
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
This configuration significantly improves the cycle characteristics of batteries by preventing contact between the active material and the electrolyte during charging, thereby suppressing electrolyte decomposition and enhancing long-term capacity retention.
Implementation Method 1
an electrode active material comprising O2-type Li-containing oxide and lithium hydroxide
Implementation Method 2
suppressing electrolyte decomposition and enhancing long-term capacity retention
Data Source
AI summary
Disclosed is a technique that can improve cycle characteristics of a battery when the battery is configured using an electrode active material having an O2-type structure. The electrode active material of the present disclosure comprises O2-type Li-containing oxide and lithium hydroxide, and is characterized in that an O1s spectrum of the electrode active material acquired by XPS satisfies 0.20≤S1/(S1+S2)≤0.73 (S1: area of peak derived from lithium hydroxide at 531.4 eV, and S2: area of peak derived from the O2-type Li-containing oxide at 529.4 eV).