Solid-State Battery Cathode Structure for Stable Ag Cycling
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Solution Overview
Problem
Existing all-solid-state batteries face challenges in maintaining performance over multiple charge and discharge cycles, necessitating an improvement in cycle characteristics.
Innovation Solution
The all-solid-state battery design incorporates a sintered body with a positive electrode containing a Ag-containing compound, a Li-containing transition metal oxide, and an oxide with a different composition, where the Ag-containing compound and Li-containing transition metal oxide are separated by the oxide, enhancing the cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a sintered body structure is used with Ag-containing compound and Li-containing transition metal oxide in direct contact, then the battery capacity can be increased, but the cycle characteristics deteriorate due to Ag oxidation during charging and discharging
Solution Approach 1:
An oxide layer is introduced as an intermediary substance between the Ag-containing compound and the Li-containing transition metal oxide. This oxide layer prevents direct contact and chemical reaction between Ag and the transition metal oxide during charging and discharging cycles, thereby preventing Ag oxidation while maintaining ionic conductivity for Li ions. The oxide acts as a protective mediator that resolves the contradiction between maintaining high capacity and achieving good cycle stability.
2Reliability
If the oxide layer thickness is increased to prevent Ag oxidation, then cycle characteristics improve, but ionic conductivity may be reduced
Solution Approach 1:
The thickness of the oxide layer is precisely controlled within a specific range (0.01-2.0 μm) to optimize both cycle characteristics and ionic conductivity. By adjusting this critical parameter, the oxide layer becomes thin enough to allow sufficient Li ion transport while being thick enough to prevent Ag oxidation. This parameter optimization resolves the contradiction between reliability and energy 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
This configuration effectively improves the cycle characteristics of the all-solid-state battery by preventing the oxidation of Ag during charging and discharging, leading to better energy efficiency and prolonged battery life.
Implementation Method 1
the oxide prevents the Ag-containing compound from oxidizing upon contact with the Li-containing transition metal oxide
Data Source
AI summary
An all-solid-state battery including a sintered body including a positive electrode, a negative electrode and a solid electrolyte layer between the positive electrode and the negative electrode, in which the positive electrode contains a Ag-containing compound, a Li-containing transition metal oxide and an oxide having a composition different from a composition of the Li-containing transition metal oxide, the oxide contains Ag, and at least a part of the Ag-containing compound and the Li-containing transition metal oxide is present in the positive electrode with the oxide present therebetween.