Sulfide All-Solid-State Battery Capacity Retention via Oxygen Exposure
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Solution Overview
Problem
Conventional sulfide all-solid-state batteries face decreased capacity retention due to lithium deactivation at the anode, leading to performance issues.
Innovation Solution
A method involving initial charging of the sulfide all-solid-state battery in an oxygen-containing gas atmosphere and exposing it to the same atmosphere after charging, with the anode potential set to 0.85 V (vs. Li/Li+) or less, to form a high oxygen concentration layer on the sulfide-based solid electrolyte, enhancing its stability and capacity retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional sulfide all-solid-state battery is charged and discharged in argon gas atmosphere, then battery operation is maintained, but capacity retention rate decreases due to lithium deactivation at the anode
Solution Approach 1:
The patent applies preliminary action by initially charging the battery in an oxygen-containing gas atmosphere before normal operation. This initial charging step creates a protective oxide layer on the sulfide-based solid electrolyte surface in advance, preventing subsequent lithium deactivation during normal argon atmosphere operation. The preliminary oxidation treatment modifies the electrolyte surface properties before the harmful lithium deactivation can occur.
Solution Approach 2:
The patent changes the chemical composition parameter of the solid electrolyte surface by exposing it to oxygen-containing gas atmosphere. This parameter change creates an oxide layer with different chemical properties that is resistant to lithium deactivation. The oxygen concentration and chemical state of the electrolyte surface are deliberately modified to improve capacity retention.
2Stability of the object's composition
If sulfide-based solid electrolyte surface is oxidized to form oxide layer, then surface stability is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the battery's own initial charging process to create the protective oxide layer. The first charge cycle automatically oxidizes the sulfide-based solid electrolyte surface without requiring separate oxidation equipment or additional manufacturing steps. The battery system performs the surface modification function using its own operational parameters.
Solution Approach 2:
The patent merges the surface oxidation process with the initial charging process. Instead of treating these as separate steps, the invention combines them into a single integrated process where the initial charging simultaneously activates the battery and creates the protective oxide layer, simplifying the overall manufacturing workflow.
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 significantly increases the capacity retention rate of sulfide all-solid-state batteries by preventing deterioration of the solid electrolyte, as evidenced by increased capacity retention ratios compared to conventional methods.
Implementation Method 1
exposing the sulfide all-solid-state battery to an oxygen-containing gas atmosphere... the sulfide-based solid electrolyte comprises a high oxygen concentration layer on a surface in contact with the anode active material
Data Source
AI summary
A method for producing a sulfide all-solid-state battery with a high capacity retention rate, and a sulfide all-solid-state battery with a high capacity retention rate. The method for producing a sulfide all-solid-state battery may comprise forming a sulfide all-solid-state battery, initially charging the sulfide all-solid-state battery after the forming of the sulfide all-solid-state battery, and exposing the sulfide all-solid-state battery to an oxygen-containing gas atmosphere at at least any one of a time of the initially charging of the sulfide all-solid-state battery and a time after the initially charging of the sulfide all-solid-state battery.