Si-Based Anode Layer with Solvated Ionic Liquid for Solid-State Batteries
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Solution Overview
Problem
All-solid-state batteries with Si-based anode materials face challenges in forming effective interfaces due to the rigidity of elemental Si, leading to low ion conductivity and energy density, as spaces between Si particles hinder ion conduction paths.
Innovation Solution
Incorporating a solvated ionic liquid with a high molar ratio of lithium salts (1.5 mol or more of lithium bis(fluorosulfonyl)imide or 2.0 mol or more of lithium bis(trifluoromethanesulfonyl)imide to tetraglyme into the anode layer, which fills spaces and enhances ion conductivity without reducing energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If the spaces of the anode layer are filled with an ionic liquid, then the volume percentage of spaces in the anode layer is decreased, but the ion conductivity of the anode layer may decrease and the energy density of the anode layer may decrease
Solution Approach 1:
The patent applies parameter changes by carefully controlling the volume percentage of ionic liquid (5-50 vol%) and the composition ratios of components in the anode layer. By optimizing these parameters, the patent achieves a balance where spaces are sufficiently filled to improve structural integrity while maintaining adequate ion conductivity and energy density.
Solution Approach 2:
The patent uses composite materials by combining ionic liquid with solid electrolyte and Si-based anode active material in a multi-component system. This composite approach allows the ionic liquid to fill spaces and improve structural stability while the solid electrolyte and Si-based material maintain ion conductivity and energy density through their inherent properties.
2Volume of stationary object
If the spaces of the anode layer are filled with an ionic liquid, then the volume percentage of spaces in the anode layer is decreased, but the energy density of the anode layer may decrease
Solution Approach 1:
The patent optimizes the volume percentage of ionic liquid within 5-50 vol% to balance space filling with energy density maintenance. By controlling this parameter along with the ratios of solid electrolyte and Si-based material, the patent ensures that the anode layer achieves improved structural integrity without significant energy density loss.
Solution Approach 2:
The composite material system combines ionic liquid, solid electrolyte, and Si-based anode active material where each component contributes to overall performance. The ionic liquid fills spaces to improve structure, while the high-capacity Si-based material and solid electrolyte maintain energy density, achieving a synergistic effect.
3Stability of the object's composition
If Si-based material is used as anode active material, then the anode layer is less likely to deform, but many spaces are formed between the Si-based material and other materials in the anode layer
Solution Approach 1:
The patent uses ionic liquid as an intermediary substance that fills the spaces between rigid Si-based material particles and other anode layer components. This intermediary material improves the overall structural integrity and reduces void spaces while maintaining the deformation resistance provided by the Si-based material.
Solution Approach 2:
The patent utilizes the porous or spaces-containing structure of the anode layer formed by Si-based material as a beneficial feature, filling these spaces with ionic liquid. This approach transforms the harmful void spaces into useful regions that contain ionic liquid, which can facilitate ion transport and improve structural stability.
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 use of highly concentrated ionic liquids increases ion conductivity by coordinating with Li ions and reduces the likelihood of reaction with the solid electrolyte, maintaining the energy density of the anode layer comparable to conventional designs.
Implementation Method 1
The use of highly concentrated ionic liquids increases ion conductivity by coordinating with Li ions
Implementation Method 2
Incorporating a solvated ionic liquid with a high molar ratio of lithium salts into the anode layer, which fills spaces
Data Source
AI summary
Provided is an anode configured to increase the ion conductivity of an anode layer and suppress a decrease in the energy density of the anode layer. Disclosed is an anode, wherein the anode is an anode comprising an anode layer for all-solid-state batteries; wherein the anode layer comprises an anode active material, a solid electrolyte and an ionic liquid; wherein the anode layer comprises at least one Si-based material selected from the group consisting of elemental Si and Si alloy as the anode active material; and wherein the ionic liquid is a solvated ionic liquid containing, in molar ratio, 1.5 mol or more of lithium bis(fluorosulfonyl)imide with respect to 1 mol of tetraglyme, or the ionic liquid is a solvated ionic liquid containing, in molar ratio, 2.0 mol or more of lithium bis(trifluoromethanesulfonyl)imide with respect to 1 mol of tetraglyme.