Negative electrode for solid electrolyte battery and solid electrolyte battery
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Solution Overview
Problem
Solid electrolyte batteries using halide-based solid electrolytes exhibit a large irreversible capacity during initial charging and discharging, leading to insufficient initial charging and discharging efficiency.
Innovation Solution
A negative electrode for solid electrolyte batteries is designed, comprising a negative electrode active material, a first compound (a halide-based solid electrolyte), and a second compound (such as LiF or Li2ZrF6) that is provided between the negative electrode active material and the first compound, enhancing the initial charging and discharging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a halide-based solid electrolyte is used in a solid electrolyte battery, then high ion conductivity is achieved, but initial charging and discharging efficiency becomes insufficient due to large irreversible capacity
Solution Approach 1:
The patent introduces a specific compound (Li2ZrO3 or Li2SiO3) as an intermediary layer between the halide-based solid electrolyte and the negative electrode active material. This intermediary compound mediates the interface interaction, reducing irreversible capacity while maintaining high ion conductivity through the halide-based solid electrolyte.
Solution Approach 2:
The patent creates a composite structure combining the halide-based solid electrolyte with specific intermediary compounds (Li2ZrO3 or Li2SiO3) at the interface with the negative electrode active material. This composite material approach leverages the high ion conductivity of halide-based electrolytes while the intermediary compound reduces irreversible capacity through improved interface compatibility.
2Strength
If lithium halide is added to improve adhesion between electrode and solid electrolyte layer, then physical and electrical connection is improved, but initial charging and discharging efficiency is not enhanced
Solution Approach 1:
The patent introduces a specific intermediary compound (Li2ZrO3 or Li2SiO3) that acts as a mediator between the electrode and solid electrolyte layer. This intermediary provides both adhesion improvement and reduction of irreversible capacity, unlike lithium halide alone which only improves adhesion.
Solution Approach 2:
The patent changes the chemical composition parameter at the interface by introducing compounds with specific properties (Li2ZrO3 or Li2SiO3) that have both adhesive characteristics and electrochemical compatibility, thereby simultaneously improving adhesion and initial charging/discharging efficiency.
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 proposed configuration significantly improves the initial charging and discharging efficiency of solid electrolyte batteries, reducing irreversible capacity and enhancing overall battery performance.
Implementation Method 1
halide-based solid electrolytes have been considered as solid electrolytes that may have higher ion conductivity than these solid electrolytes
Data Source
AI summary
A negative electrode for a solid electrolyte battery includes a negative electrode active material, a first compound, and a second compound, wherein the first compound is AaEbGcXd . . . (1), the second compound is different from the first compound, and is at least one of LiX . . . (2) and LiaEbFgXd . . . (3), in Formulae (1) to (3), A is Li, or Li and Na or Ca, E is at least one element selected from the group consisting of Al, Sc, Y, Zr, Hf, and lanthanoids, G is a predetermined group, X is at least one element selected from the group consisting of F, Cl, Br, and I, and 0.5≤a<6, 0<b<2, 0.1<c≤6, 0<d≤6.1, 0.5≤e<6, 0<f<2, 1.3≤g≤6.1, and 0≤h≤6.1 are satisfied.