Lithium Air Battery Anode Protective Layer for Dendrite Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium air batteries face rapid deterioration due to the formation of lithium dendrites at the anode during charging and discharging, leading to short circuits and reduced lifespan.
Innovation Solution
Incorporating a protective layer with a liquid electrolyte of low viscosity (5 centipoise or less) and an ion conductive solid electrolyte membrane in the anode to suppress dendrite growth, along with a suitable lithium salt and solvent composition to maintain conductivity and viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as the anode, then high capacity is achieved, but lithium dendrite formation occurs leading to short circuits and rapid deterioration
Solution Approach 1:
A protective layer comprising a liquid electrolyte with viscosity of 5 centipoise or less and an ion conductive solid electrolyte membrane is introduced as an intermediary between the lithium metal anode and the battery environment. This protective layer prevents direct exposure of lithium metal to harmful conditions while maintaining lithium ion conductivity, thus suppressing dendrite formation and extending battery lifespan without reducing capacity
Solution Approach 2:
The protective layer is constructed as a composite structure combining a liquid electrolyte with specific viscosity characteristics and an ion conductive solid electrolyte membrane. This composite material approach leverages the advantages of both liquid electrolyte (high ionic conductivity) and solid electrolyte membrane (mechanical stability and dendrite suppression) to achieve both high capacity and long lifespan
2Reliability
If a protective layer is added to suppress dendrite growth, then battery lifespan is improved, but device complexity increases
Solution Approach 1:
The protective layer is segmented into two distinct functional components: a liquid electrolyte layer with viscosity of 5 centipoise or less and an ion conductive solid electrolyte membrane. This segmentation allows each component to perform its specific function optimally while maintaining a relatively simple overall structure that can be integrated into existing battery designs
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
Significantly improves the lifespan of lithium air batteries by preventing dendrite formation and maintaining high conductivity, thus enhancing the battery's performance and reliability.
Implementation Method 1
a first protective layer includes a liquid electrolyte having a viscosity of 5 centipoise (cps) or less at a temperature of 20° C.
Implementation Method 2
a second protective layer includes an ion conductive solid electrolyte membrane
Implementation Method 3
the liquid electrolyte may include a solvent and a lithium salt
Data Source
AI summary
An anode for a lithium air battery including an anode active material layer including an anode active material; a first protective layer disposed on the anode active material layer; and a second protective layer disposed on the first protective layer, wherein the first protective layer includes a liquid electrolyte having a viscosity of 5 centipoise or less at a temperature of 20° C., and the second protective layer includes an ion conductive solid electrolyte membrane.