Solid-State Lithium Battery Fast Charging to Reduce Electrode Deformation
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Solution Overview
Problem
Conventional solid-state lithium-based batteries without an intentionally deposited lithium anode experience large lithium island formation during charging, leading to stress and deformation of the top electrode when charged at constant rates below 3 C.
Innovation Solution
A method involving an initial fast charging burst at a rate of 5 C or greater for 50 seconds or less in solid-state lithium-based thin-film batteries without an intentionally deposited lithium anode, forming a high-density, uniformly distributed lithium accumulation region between the electrolyte and top electrode to reduce stress on the top electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If charging is performed at a constant charge rate lower than 3 C, then the battery can be charged safely, but large lithium islands form which lead to stress and deformation of the top electrode
Solution Approach 1:
The charging process is divided into multiple stages with different charge rates. The method applies periodic variation in charging conditions: an initial fast charge stage at 5 C or greater for 50 seconds or less, followed by a second charging stage at a lower charge rate. This periodic action prevents large lithium island formation while maintaining charging safety.
Solution Approach 2:
The charge rate parameter is changed during the charging process. The method transitions from a high charge rate (5 C or greater) in the initial stage to a lower charge rate in the second stage. This parameter change optimizes lithium ion distribution, forming uniform small-sized lithium islands and preventing top electrode deformation.
2Reliability
If charging is performed at a constant charge rate lower than 3 C, then the battery can be charged safely, but the charging time increases
Solution Approach 1:
The charging process uses periodic action with an initial fast charge stage at 5 C or greater for 50 seconds or less, followed by a second charging stage at a lower rate. This staged approach reduces total charging time while maintaining safety by preventing lithium island formation during the high-rate initial stage.
Solution Approach 2:
The initial fast charging stage serves as a preliminary action that quickly establishes a uniform distribution of small lithium islands before the main charging process. This preliminary high-rate charging prevents subsequent lithium accumulation that would occur with slow charging, thereby reducing total charging time while ensuring safety.
3Shape
If fast charging at 5 C or greater is performed for 50 seconds or less, then lithium island size is minimized and top electrode deformation is reduced, but the charging is not completed
Solution Approach 1:
The charging process employs periodic action with two distinct stages: an initial fast charge stage at 5 C or greater for 50 seconds or less to form uniform small lithium islands, followed by a second charging stage at a lower rate to complete the charging. This staged approach achieves both lithium island uniformity and charging completion.
Solution Approach 2:
The initial fast charging stage performs a preliminary function of establishing uniform lithium distribution and preventing large island formation. The subsequent second charging stage then completes the charging process at a lower rate, ensuring both structural integrity and full charging.
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 minimizes lithium island size and density, reducing stress on the top electrode and potentially eliminating deformation, while allowing for safe and efficient charging of solid-state lithium-based batteries.
Implementation Method 1
a lithium-based solid-state electrolyte layer located on the lithiated cathode material layer
Data Source
AI summary
A method of charging a solid-state lithium-based battery that does not include a lithium deposited anode (i.e., lithium anode-free, solid-state lithium-based battery) is provided. The method includes charging a lithium anode-free, solid-state lithium-based battery that needs to be charged utilizing at least an initial charge stage in which a charge rate of 5 C or greater is performed for a period of time of 50 seconds or less. Such charging can produce a reduced deformation of the top electrode of the lithium anode-free, solid-state lithium-based battery.