Core-Shell Electrode Material for Battery Interface Stability
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Solution Overview
Problem
Conventional non-aqueous electrolyte secondary batteries face challenges in stabilizing the electrode active material/electrolyte interface and achieving high energy density due to issues with coulomb efficiency and adhesion between electrode active materials and gel electrolytes.
Innovation Solution
A non-aqueous electrolyte secondary battery design incorporating a core-shell-type electrode material with a conductive shell formed by a gel-forming polymer having a liquid absorption rate of 10 to 200% for the electrolyte solution, which stabilizes the electrode active material surface and enhances adhesion, thereby improving coulomb efficiency and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additive is added to the electrolyte solution to form a protective coating film (SEI) on the electrode surface, then the interface stability is improved, but the coulomb efficiency is lowered due to continuous electrochemical reactions consuming electricity
Solution Approach 1:
The gel-forming polymer is pre-coated on the electrode active material surface before battery operation. This preliminary coating provides immediate interface stability without requiring continuous electrochemical reactions during operation, thus avoiding coulomb efficiency loss while maintaining protective film functionality
2Reliability
If a gel electrolyte is infiltrated into the electrode active material layer to improve safety, then chemical stability is improved, but adhesion between active material and gel electrolyte is poor making interface control difficult
Solution Approach 1:
The gel-forming polymer coating provides localized gel electrolyte properties directly at the electrode active material surface, ensuring good adhesion where it is most needed for interface control, while the bulk electrolyte solution maintains chemical stability throughout the battery
3Quantity of substance
If the battery size is increased to achieve high energy density, then the energy density is improved, but the interface stabilization becomes more difficult
Solution Approach 1:
By pre-coating the electrode active material with gel-forming polymer before battery assembly, the interface is stabilized in advance, allowing larger battery designs to maintain reliable electrode-electrolyte interfaces throughout the expanded structure
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 effectively stabilizes the electrochemical interface, improves initial charge and discharge efficiency, and increases the energy density of the battery by securing a conductive path for lithium ions and electrons with low resistance.
Implementation Method 1
a base material formed by a gel-forming polymer having a liquid absorption rate with respect to the electrolyte solution of 10 to 200%
Implementation Method 2
securing a conductive path for lithium ions and electrons with low resistance
Implementation Method 3
Charge and discharge reactions of a battery occur by absorption and desorption of ions such as lithium ions on electrode active materials
Data Source
AI summary
A non-aqueous electrolyte secondary battery has a positive electrode having a positive electrode active material layer, a negative electrode having a negative electrode active material layer, and an electrolyte layer having an electrolyte solution containing a non-aqueous solvent. At least one of the positive electrode active material layer and the negative electrode active material layer contains an electrode material for a non-aqueous electrolyte secondary battery having a core part including an electrode active material and a shell part including a conductive material in a base material formed by a gel-forming polymer having a liquid absorption rate with respect to the electrolyte solution of 10 to 200%.