Composite Electrolyte Structure for Lithium Metal Battery
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Solution Overview
Problem
Lithium metal batteries with lithium thin film anodes face issues due to high reactivity with liquid electrolytes, leading to reduced lifetime and stability, and dendritic growth, which affects their performance and longevity.
Innovation Solution
A composite electrolyte structure is introduced, comprising a protective layer with a Young's modulus of 106 Pa or greater, including particles with sizes between 1 μm to 100 μm, and a solid electrolyte layer with particles of similar size range, along with a ceramic conductor, to inhibit lithium dendrite growth and enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as the anode, then energy density is improved, but the anode becomes highly reactive with liquid electrolyte leading to reduced lifetime and stability
Solution Approach 1:
A protective layer comprising particles with a Young's modulus of 10^6 Pa or greater is introduced as an intermediary between the lithium metal anode and the liquid electrolyte. This protective layer prevents direct contact and high reactivity between lithium metal and liquid electrolyte, thereby improving lifetime and stability while maintaining the high energy density benefits of lithium metal anodes.
2Use of energy by moving object
If lithium metal is used as the anode, then energy density is improved, but dendritic growth occurs on the lithium thin film anode
Solution Approach 1:
The protective layer acts as a mediator that suppresses dendritic growth by providing a stable interface between the lithium metal anode and electrolyte. The particles in the protective layer with appropriate mechanical properties (Young's modulus ≥ 10^6 Pa) prevent the formation and propagation of dendrites, thereby maintaining compositional stability while preserving the high energy density advantage.
3Reliability
If a protective layer with particles of 1 μm to 100 μm size is used, then lithium dendrite growth is inhibited and stability is improved, but device complexity increases
Solution Approach 1:
The protective layer is constructed using composite materials comprising particles with specific size ranges (1 μm to 100 μm) and appropriate Young's modulus (≥ 10^6 Pa). This composite structure provides the necessary mechanical properties to inhibit dendrite growth and improve stability, while the particle-based composition allows for relatively straightforward integration into existing battery manufacturing processes.
Data Source
AI summary
A composite electrolyte structure includes: a protective layer having a Young's modulus of about 106 pascals or greater and including a first particle, the first particle including an organic particle, an inorganic particle, an organic-inorganic particle, or a combination thereof, wherein the particle in the protective layer has a particle size of greater than 1 micrometer to about 100 micrometers, and a solid electrolyte layer including a second particle including an organic particle, an inorganic particle, an organic-inorganic particle, or a combination thereof, wherein the second particle has a particle size of greater than 1 micrometer to about 100 micrometers, wherein the first particle and the second particle are the same or different, and wherein the protective layer is on the solid electrolyte layer.