Lithium-Garnet Composite Membrane for Dendrite-Resistant Interfaces
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Solution Overview
Problem
Conventional lithium-garnet electrolytes in solid-state lithium batteries face challenges due to insufficient contact between the Li anode and garnet electrolyte, leading to low critical current density and potential short circuiting, as well as issues with lithium dendrite formation and surface impurities.
Innovation Solution
A lithium-garnet composite ceramic electrolyte is developed, comprising a lithium-garnet major phase and a lithium dendrite growth inhibitor minor phase, with additives such as Li-silicate and other metal oxides to enhance grain boundary bonding and inhibit lithium dendrite growth, achieved through a process involving sintering and tape casting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rigid ceramic garnet electrolyte is used, then safety is improved, but poor lithium wettability and surface impurities cause large polarization and interfacial resistances
Solution Approach 1:
The patent applies local quality by modifying only the surface or interfacial region of the garnet electrolyte through the addition of a secondary phase material. This localized modification improves lithium wettability and reduces surface impurities at the critical Li-anode/garnet interface, thereby reducing polarization and interfacial resistance without compromising the bulk safety properties of the ceramic electrolyte.
2Use of energy by moving object
If conventional lithium-garnet electrolyte is used, then energy density is limited, but dendrite formation causes short circuiting
Solution Approach 1:
The patent uses composite materials to create a dual-functional electrolyte system where the lithium-garnet phase provides high ionic conductivity for energy density, while the incorporated secondary phase (such as lithium phosphate) specifically targets and inhibits dendrite growth at grain boundaries and interfaces. This composite structure enables simultaneous achievement of high energy density and short circuit prevention.
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 ceramic electrolyte improves the critical current density and mechanical properties, reducing lithium dendrite growth and enhancing the stability and conductivity of the battery, thereby addressing the limitations of conventional lithium-garnet electrolytes.
Implementation Method 1
a method comprises: sintering a metal oxide component/garnet green tape at a temperature in a range of 950° C. to 1500° C. to form a composite ceramic
Data Source
AI summary
A sintered composite ceramic, includes: a lithium-garnet major phase; and a lithium dendrite growth inhibitor minor phase, such that the lithium dendrite growth inhibitor minor phase has a Li-metal oxide in a range of >0-10 wt. % based on the total weight of the sintered composite ceramic.