All-Solid-State Battery Overdischarge for Reaction Uniformity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All-solid-state batteries experience non-uniform electrode reactions due to the absence of fluidity in their solid-state electrolyte, leading to reaction variance that causes deterioration in battery characteristics, which existing regeneration methods fail to effectively mitigate.
Innovation Solution
A regeneration method for all-solid-state batteries that involves overdischarge control by discharging the battery until the cathode potential becomes lower than the elution potential of copper, using a cathode without copper and potentially with a type-II silicon clathrate crystal phase, to mitigate reaction variance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional discharge methods (CC/CV) are used for all-solid-state batteries, then the battery can be discharged to lower limit voltage, but reaction variance cannot be effectively mitigated due to non-uniform electrode reactions caused by solid-state electrolyte lack of fluidity
Solution Approach 1:
The patent changes the discharge parameter by introducing overdischarge control that continues discharging beyond conventional lower limit voltage until cathode potential reaches copper elution potential. This parameter extension allows mitigation of reaction variance by enabling uniformization of electrode reactions through controlled overdischarge, resolving the contradiction between maintaining discharge efficiency and improving reaction uniformity
Solution Approach 2:
The patent implements feedback control by monitoring cathode potential in real-time during discharge and using this information to determine when to terminate the discharge process. The feedback mechanism compares cathode potential against copper elution potential threshold, allowing dynamic adjustment of discharge termination to optimize both reaction uniformity and discharge efficiency
2Reliability
If the cathode potential is discharged below copper elution potential, then reaction variance is mitigated, but there is a risk of copper elution from the cathode current collector
Solution Approach 1:
The patent applies partial overdischarge by controlling the discharge to extend slightly below conventional voltage limits to just reach copper elution potential, rather than excessive discharge that would cause harmful copper elution. This controlled partial extension achieves reaction uniformization while preventing the harmful effect of copper dissolution
Solution Approach 2:
The patent converts the potential harm of copper elution into a beneficial indicator by using copper elution potential as a precise termination threshold. The discharge is controlled to reach this threshold for uniformization benefit while stopping before actual copper elution harm occurs, transforming a harmful phenomenon into a useful control reference
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 method effectively reduces reaction variance in all-solid-state batteries, improving their characteristics by ensuring uniform electrode reactions and reducing deterioration.
Implementation Method 1
variance in electrode reactions (desorption/insertion of Li ions) may occur during charging and discharging
Implementation Method 2
discharging the all-solid-state battery until a potential of the cathode becomes lower than an elution potential of copper
Data Source
AI summary
A regeneration method of an all-solid-state battery includes a step of preparing an all-solid-state battery having a cathode that does not contain copper, and a step of executing overdischarge control of the all-solid-state battery. The overdischarge control is control of mitigating reaction variance that is variance in electrode reaction due to charging and discharging of the all-solid-state battery, by discharging the all-solid-state battery until a potential of the cathode becomes lower than an elution potential of copper.