Organic Particle Functional Layer for Battery Transition Metal Trapping
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries with transition metal-containing positive electrode active materials face issues with transition metal ions, such as cobalt, dissolving into the electrolyte and depositing on the negative electrode, which compromises battery life characteristics like cycle performance.
Innovation Solution
A functional layer for non-aqueous secondary batteries is developed using organic particles with an aliphatic conjugated diene monomer unit, ensuring high transition metal trapping and adhesion by regulating the monomer unit content and degree of swelling, and employing a core-shell structure to enhance adhesion and ion diffusivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If transition metal-containing positive electrode active material is used to increase battery capacity, then battery performance is improved, but transition metal ions dissolve into the electrolyte and deposit on the negative electrode, compromising battery life characteristics
Solution Approach 1:
The patent introduces an organic particle-containing functional layer as an intermediary component between the positive and negative electrodes. This functional layer contains organic particles with specific functional groups that can trap transition metal ions, preventing their migration from the positive electrode to the negative electrode while allowing lithium ion transport, thus resolving the contradiction between high capacity and long cycle life
Solution Approach 2:
The patent converts the harmful effect of transition metal ion dissolution into a beneficial trapping mechanism. The organic particles in the functional layer are designed to specifically capture and retain transition metal ions that would otherwise migrate and harm the negative electrode, thereby transforming the problematic dissolution phenomenon into a controlled trapping process that protects the battery
2Reliability
If organic particles with high aliphatic conjugated diene monomer unit content are used to enhance transition metal trapping, then trapping ability is improved, but adhesion of the functional layer may be compromised
Solution Approach 1:
The patent optimizes the composition parameters of the organic particles, specifically controlling the aliphatic conjugated diene monomer unit content within 5-85 mass% and the total monomer units within 50-100 mass%. By precisely adjusting these parameters, the patent achieves both high transition metal trapping ability and sufficient adhesion, resolving the contradiction between trapping performance and layer stability
Solution Approach 2:
The patent creates composite organic particles containing multiple monomer units with different functions. The aliphatic conjugated diene monomer units provide transition metal trapping capability, while other monomer units contribute to adhesion and structural integrity. This composite structure allows simultaneous achievement of high trapping ability and good adhesion
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 functional layer effectively traps transition metal ions, improving cycle characteristics and low-temperature output while maintaining high adhesion, thus extending battery life and performance.
Implementation Method 1
trapping transition metal ions such as cobalt ions dissolved into the electrolysis solution from the positive electrode active material
Implementation Method 2
ensuring high adhesion of the functional layer
Implementation Method 3
by conferring to battery member functional layers a function of trapping transition metal ions
Data Source
AI summary
To provide a technique of trapping transition metal ions such as cobalt ions dissolved from positive electrode active material in a secondary battery to prevent deposition of transition metal on the negative electrode. Disclosed is a composition for non-aqueous secondary battery functional layer which contains organic particles containing an aliphatic conjugated diene monomer unit at an amount of 5% by mass or more based on the total monomer units in the organic particles, wherein the composition comprises the organic particles at an amount of 50% by mass or more in terms of solid content.