Halide Electrolyte Activation in Solid-State Batteries Above 4.0 V
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Solution Overview
Problem
Existing all-solid-state batteries (ASSBs) utilizing halide electrolytes have untapped potential for enhancing performance, particularly in silicon and anode-less chemistry, due to their conventional use solely for ionic conduction, limiting their specific capacity and efficiency.
Innovation Solution
Activating the all-solid-state battery comprising a halide electrolyte with a specific formula by charging it at a voltage greater than 4.0 V vs Li+/Li, leveraging the reversible electrochemical activity of Y-doped LZC to enhance specific capacity and address issues in silicon and anode-less chemistry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If halide electrolyte is used solely for ionic conduction, then device simplicity is maintained, but specific capacity is limited
Solution Approach 1:
The halide electrolyte is designed to perform multiple functions: it serves as both the ionic conductor and the active material for lithium storage. This multi-functionality allows the electrolyte to contribute to specific capacity beyond traditional ionic conduction, achieving up to 35% enhancement in anode-less cells and 50% in Si-based cells
2Quantity of substance
If conventional charging voltage is used, then electrolyte stability is maintained, but specific capacity enhancement is limited
Solution Approach 1:
The charging voltage parameter is changed from conventional levels to greater than 4.0 V vs Li+/Li. This parameter change activates the electrolyte's redox activity, enabling lithium extraction and insertion reactions that significantly enhance specific capacity while maintaining electrolyte stability through reversible faradic activity
3Quantity of substance
If silicon anode is used, then energy density is improved, but structural stability deteriorates
Solution Approach 1:
The halide electrolyte acts as an intermediary between the silicon anode and lithium ions. It forms a stable interface that accommodates silicon's volume expansion while maintaining ionic conductivity, thereby preserving anode structural stability during cycling
4Device complexity
If anode-less chemistry is used, then device complexity is reduced, but capacity retention worsens
Solution Approach 1:
The halide electrolyte provides self-service by acting as both the ionic conductor and the lithium storage medium. In anode-less cells, the electrolyte's reversible redox activity enables it to store and release lithium ions, achieving up to 35% capacity enhancement while maintaining the simplicity of anode-less design
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 activation method significantly enhances the specific capacity of ASSBs by 35% in anode-less cells and 50% in Si-based cells, improves cell safety and longevity, and maintains electrolyte properties despite structural changes, with reversible faradic activity observed across various compositions.
Implementation Method 1
charging it at a voltage greater than 4.0 V vs Li +/Li, leveraging the reversible electrochemical activity of Y-doped LZC to enhance specific capacity
Implementation Method 2
Existing all-solid-state batteries (ASSBs) utilizing halide electrolytes have untapped potential for enhancing performance, particularly in silicon and anode-less chemistry, due to their conventional use solely for ionic conduction
Data Source
Figure 1~3c
Figure 4a
Figure 5b
AI summary
The present invention relates to a method for activating an all-solid-state battery comprising a halide electrolyte having the formula: Li[(x-y)+a+b+c+p]NayZr(1-a-b-c)EraYbSCcCl[(4+x)-m-n-o-p]ImBrnFoOp in which: 0.2 ≤ x ≤ 6; 0 ≤ y ≤ 6; 0 ≤ a ≤ 1; 0 ≤ b ≤ 1; 0 ≤ c ≤ 1; 0 ≤ m ≤ 1; 0 ≤ n ≤ 1; 0 ≤ o ≤ 1; 0 ≤ p ≤ 2; with 0 ≤ a+b+c ≤ 1 and (4+x) > (m+n+o+p), characterized in that the battery is activated by charging it at a voltage greater than 4.0 V vs Li+/Li.