Core-Shell Electrode Material for Non-Aqueous Battery
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face an increase in internal resistance due to insufficient electron and ion conduction networks caused by insulating thin films from binders, leading to suboptimal charge and discharge efficiency.
Innovation Solution
Incorporating a conductive material into a gel-forming polymer with a tensile elongation at break of 10% or more in the shell part of the electrode active material, forming a core-shell structure to enhance conduction paths for both lithium ions and electrons, while maintaining flexibility to accommodate expansion and shrinkage during battery cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a binder is used to bind electrode active materials in the active material layer, then the electrode active materials are bound together and come into close contact with the current collector, preventing the negative electrode body from coming off and preventing internal short, but the internal resistance of the battery increases
Solution Approach 1:
The invention extracts the harmful insulating binder from the active material layer while maintaining electrode stability through a different mechanism. The shell part made of gel-forming polymer with conductive material provides structural support and electrical conductivity simultaneously, eliminating the need for insulating binders in the active material layer.
Solution Approach 2:
The invention uses a composite structure where the shell part combines gel-forming polymer (for flexibility and structure) with conductive material (for electrical conductivity). This composite material simultaneously provides mechanical support and electrical conduction, replacing the separate binder and conductive aid functions.
2Object-affected harmful factors
If a shell part with conductive material is formed around the electrode active material, then conduction paths for electrons and lithium ions are secured and internal resistance is minimized, but the structure becomes more complex
Solution Approach 1:
The shell part is designed to perform multiple functions simultaneously: it provides structural support, maintains electrical conductivity, facilitates lithium ion transport, and accommodates volume changes during charging/discharging. This multi-functionality reduces the need for separate components, simplifying the overall structure despite the advanced material composition.
3Duration of action of moving object
If a gel-forming polymer with high tensile elongation at break is used in the shell part, then the shell can accommodate expansion and shrinkage during battery cycles without breaking, but the manufacturing precision requirements increase
Solution Approach 1:
The invention changes the key parameter of the gel-forming polymer from standard tensile strength to high tensile elongation at break (≥10%). This parameter change allows the shell to undergo significant deformation during battery cycling without breaking, greatly improving cycle stability. The specific parameter requirement guides material selection and formulation during manufacturing.
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 effectively minimizes internal resistance by securing conduction paths and preventing shell breakage, thereby improving the battery's charge and discharge efficiency and cycle stability.
Implementation Method 1
a base material formed by a gel-forming polymer having a tensile elongation at break of 10% or more in a gel state
Implementation Method 2
a shell part in which a conductive material is included in a base material formed by a gel-forming polymer
Implementation Method 3
Charging and discharging reactions of a battery occur by absorption and desorption of ions such as lithium ions on electrode active materials
Data Source
AI summary
A core-shell-type electrode material is used as an electrode active material layer of a non-aqueous electrolyte secondary battery, the core-shell-type electrode material having a core part including an electrode active material and a shell part in which a conductive material is contained in a base material formed by a gel-forming polymer having a tensile elongation at break of 10% or more in a gel state.