Impervious Composite Solid Electrolyte for Lithium Anodes
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Solution Overview
Problem
Rechargeable lithium metal batteries face challenges with lithium dendrite growth and internal short circuits due to poor cycling behavior in liquid electrolyte systems, and existing protective layers fail to adequately prevent contact between lithium electrodes and electrolytes, leading to battery degradation.
Innovation Solution
A substantially impervious composite solid electrolyte is developed, comprising a monolithic solid electrolyte base component with metal ion conductivity and a filler component that eliminates through-porosity, creating a barrier to detrimental fluids while maintaining high metal ion conductivity, suitable for protected anodes and battery cells.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective layer is applied to the lithium electrode surface, then contact between lithium and electrolyte is prevented, but lithium ion conductivity may be reduced
Solution Approach 1:
The protective layer is designed with a porous structure containing through-pores that extend from one major surface to another. These pores have diameters of 0.01 to 10 micrometers and are filled with electrolyte, allowing lithium ion transport while the solid matrix provides mechanical protection and prevents direct contact between lithium metal and bulk electrolyte
Solution Approach 2:
The protective layer is constructed as a composite material combining a solid matrix (such as ceramic or polymer) with electrolyte-filled porous structures. This composite architecture simultaneously provides mechanical strength for protection and ionic conductivity through the electrolyte-containing pores, resolving the contradiction between protection and ion transport
2Stability of the object's composition
If the protective layer is made impervious to prevent electrolyte contact, then lithium electrode stability is improved, but lithium ion transport may be hindered
Solution Approach 1:
The protective layer incorporates a controlled porous structure with through-pores filled with electrolyte, creating pathways for rapid lithium ion transport. The porosity ranges from 10-90% and is optimized to balance mechanical integrity with ionic conductivity, allowing high ion transport rates while maintaining structural stability
Solution Approach 2:
The electrolyte-filled pores act as an intermediary medium, allowing lithium ions to pass through the protective layer without direct contact between lithium metal and bulk electrolyte. The porous structure serves as a mediator that enables ion transport while the solid matrix provides the barrier function, resolving the contradiction between stability and transport speed
3Object-affected harmful factors
If through-porosity is eliminated to create an impervious barrier, then fluid penetration is prevented, but manufacturing complexity increases
Solution Approach 1:
The through-pores are intentionally created during the formation of the protective layer matrix, before the layer is applied to the lithium electrode. This preliminary creation of the porous structure simplifies subsequent manufacturing steps, as the porosity is built-in rather than requiring complex post-processing to create channels or cavities
Solution Approach 2:
The protective layer is designed with controlled through-porosity rather than being completely impervious. This approach simplifies manufacturing by allowing the use of porous formation techniques (such as sintering, phase separation, or foam extraction) that are well-established in materials processing, avoiding the need for complex sealing and bonding operations required for completely impervious structures
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 composite solid electrolyte effectively prevents lithium electrode degradation by blocking harmful fluids and maintaining high conductivity, enhancing the cycling stability and safety of lithium metal batteries.
Implementation Method 1
a filler component used to eliminate through-porosity in the solid electrolyte base component
Implementation Method 2
monolithic solid electrolyte base component having metal ion room temperature (RT) conductivity in the range of at least greater than 10−6 to about 10−2 S/cm
Data Source
AI summary
A composite solid electrolyte includes a monolithic solid electrolyte base component that is a continuous matrix of an inorganic active metal ion conductor and a filler component used to eliminate through porosity in the solid electrolyte. In this way a solid electrolyte produced by any process that yields residual through porosity can be modified by the incorporation of a filler to form a substantially impervious composite solid electrolyte and eliminate through porosity in the base component. Methods of making the composites are also disclosed. The composites are generally useful in electrochemical cell structures such as battery cells and in particular protected active metal anodes, particularly lithium anodes, that are protected with a protective membrane architecture incorporating the composite solid electrolyte. The protective architecture prevents the active metal of the anode from deleterious reaction with the environment on the other (cathode) side of the architecture, which may include aqueous, air and organic liquid electrolytes and/or electrochemically active materials.