Cathode Active Material with Organic Molecule for Structural Stability
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Solution Overview
Problem
Existing layered structure-based cathode active materials in lithium secondary batteries suffer from irreversible structural changes during charging and discharging, limiting their ability to achieve high theoretical capacity and lifespan due to thermodynamic instability.
Innovation Solution
A cathode active material is developed comprising a manganese-based metal oxide with a two-dimensional crystal structure and an organic molecule, allowing for reversible phase transitions between a thermodynamically stable and metastable phase, utilizing an organic molecule to stabilize the structure and maintain electrochemical activity during charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a layered structure-based cathode active material is used to achieve high theoretical capacity, then the energy density is improved, but the structural stability deteriorates due to irreversible structural changes during charging and discharging
Solution Approach 1:
The patent combines layered structure-based cathode active material with spinel structure-based cathode active material to form a composite material. The layered structure provides high theoretical capacity and energy density, while the spinel structure provides structural stability and prevents irreversible structural changes during charging and discharging cycles
Solution Approach 2:
The patent controls the ratio of layered structure-based cathode active material to spinel structure-based cathode active material within 95:5 to 50:50 by weight. By adjusting this parameter, the material achieves both high energy density from the layered structure and sufficient structural stability from the spinel structure
2Quantity of substance
If a layered structure-based cathode active material is used to achieve high theoretical capacity, then the capacity is improved, but the lifespan deteriorates due to irreversible structural changes
Solution Approach 1:
The composite material combines layered structure-based cathode active material (providing high capacity) with spinel structure-based cathode active material (providing structural stability and long lifespan). The spinel structure prevents irreversible structural changes that would otherwise limit the lifespan of pure layered structure materials
Solution Approach 2:
The spinel structure-based cathode active material acts as an intermediary that protects the layered structure-based cathode active material from undergoing irreversible structural changes. It provides a stable framework that maintains the overall structural integrity during repeated charging and discharging cycles
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 approach enables reversible structural changes, maintaining excellent capacity and lifespan characteristics close to the theoretical capacity of the layered structure-based material, even during repeated high-voltage charging and discharging, by bonding manganese with oxygen in the organic molecule, thus preventing irreversible spinel crystal structure formation.
Implementation Method 1
as some transition metal in the transition metal oxide forming the layered structure is chemically bonded to oxygen in the organic molecule
Implementation Method 2
the cathode active material includes a first crystal phase having a two-dimensional crystal structure and a second crystal phase having a three-dimensional crystal structure
Data Source
AI summary
The inventive concept discloses a cathode active material containing an organic molecule containing oxygen and a transition metal-based metal oxide.