Layered Electrode Material Cation Intercalation via Solvent Exclusion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Layered electrode materials experience performance deterioration due to structural transformations during charging and discharging, leading to increased impedance and difficulty in cation intercalation and deintercalation, which affects specific capacity and cyclic stability.
Innovation Solution
Regulating the interlayer spacing, cationic diameter, and solvent molecular diameter to enhance desolvation effects, preventing solvent molecules from intercalating and optimizing the working electrolyte for layered electrode materials, thereby improving specific capacity and cyclic performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If cations intercalate into layered electrode materials during charging and discharging, then energy storage function is achieved, but solvent molecules co-intercalate which deteriorates specific capacity and cyclic performance
Solution Approach 1:
The patent changes the physical parameters of the electrolyte by selecting solvents with specific molecular diameters that are larger than the interlayer spacing of the electrode material. This parameter adjustment prevents solvent co-intercalation while maintaining cation intercalation functionality, thereby improving cyclic performance without sacrificing energy storage capability
Solution Approach 2:
The patent introduces a size-matched solvent as an intermediary that selectively blocks the interlayer channels. The solvent molecules act as physical barriers that prevent harmful co-intercalation of solvent and water molecules while allowing cation transport, thus protecting the electrode structure and enhancing cyclic stability
2Ease of operation
If cationic diameter is small to fit interlayer spacing, then intercalation is facilitated, but solvent molecules easily co-intercalate causing performance deterioration
Solution Approach 1:
The patent optimizes the parameter matching between cationic diameter and solvent molecular diameter. By selecting solvents whose molecular diameter is specifically larger than the electrode interlayer spacing, the patent creates a size-exclusion effect that prevents solvent co-intercalation while maintaining favorable conditions for cation intercalation through electrostatic attraction
3Object-generated harmful factors
If cationic diameter is large to prevent solvent co-intercalation, then desolvation effect is enhanced, but intercalation becomes difficult and layered structure may collapse
Solution Approach 1:
The patent identifies and applies the optimal parameter window where cationic diameter is sufficiently large to enhance desolvation effect and prevent solvent co-intercalation, yet remains small enough to allow intercalation. This precise parameter optimization balances structure protection with functional performance
Solution Approach 2:
The patent references and applies the size-matching principle successfully demonstrated in lithium-sulfur battery electrolytes to the layered electrode material system, adapting the proven approach of using large-diameter solvent molecules to prevent co-intercalation in a different electrochemical system
4Stability of the object's composition
If interlayer spacing is small to maintain compact structure, then structural stability is improved, but cation intercalation and deintercalation become difficult
Solution Approach 1:
The patent optimizes the interlayer spacing parameter to achieve an optimal balance: spacing is sufficient to accommodate cation intercalation and deintercalation processes, yet compact enough to maintain structural stability. The patent further enhances this by using large-diameter solvents that prevent expansion and maintain the optimized spacing during cycling
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 method significantly enhances the specific capacity and cyclic stability of layered electrode materials by ensuring that solvent molecules do not intercalate, maintaining structural integrity and facilitating efficient cation intercalation and deintercalation processes.
Implementation Method 1
the interlayer spacing, cationic diameter and solvent molecular diameter are regulated to enhance the desolvation effect to make the solvent molecules fail to intercalate into the interlayer of the layered electrode material
Implementation Method 2
cations in the electrolytic solutions undergo intercalation and deintercalation in the layered electrode materials to realize the charging and discharging process
Data Source
AI summary
Disclosed is a method for improving the performance of a layered electrode material. An interlayer spacing of the layered electrode material is measured and donated as (b). A salt compound is selected and added into a solvent with a molecular diameter of (c) to prepare an electrolytic solution, where a diameter (a) of a cation in the salt compound is smaller than the interlayer spacing (b), and c>b−a. The electrolytic solution is used as the working electrolytic solution for the layered electrode material.