Protected Lithium Anode Oxide Coating for Dendrite Suppression
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Solution Overview
Problem
All-solid secondary batteries using lithium metal anodes face issues with dendrite formation due to uneven contact with solid electrolytes, leading to decreased capacity and potential short circuits, which existing protective layers fail to adequately address.
Innovation Solution
A protected anode is developed with a protective layer composed of an oxide represented by Formula AxMyO100−x−y, where A and M are specific elements, applied to the anode layer to reduce interfacial resistance and enhance electrochemical stability and discharge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as an anode for high energy density, then energy density is improved, but dendrite formation occurs due to uneven contact with solid electrolyte
Solution Approach 1:
A protective layer comprising Ge-Sb-O glass and Ge-Sb-Se-O glass is introduced as an intermediary between the lithium metal anode and the solid electrolyte. This protective layer acts as a mediator that ensures uniform contact and distributes stress evenly, preventing dendrite formation while maintaining the high energy density benefits of lithium metal anodes.
Solution Approach 2:
The protective layer is formulated as a composite material combining Ge-Sb-O glass and Ge-Sb-Se-O glass. This composite structure leverages the complementary properties of both glass systems to achieve optimal mechanical strength, flexibility, and interfacial compatibility, effectively resolving the contradiction between energy density and reliability.
2Stability of the object's composition
If solid electrolyte is used, then electrochemical stability is improved, but interfacial resistance increases due to degraded adhesive properties
Solution Approach 1:
The protective layer serves as an intermediary that bridges the lithium metal anode and the solid electrolyte interface. It contains Ge-Sb-O glass and Ge-Sb-Se-O glass components that provide chemical compatibility with both materials, ensuring low interfacial resistance while preserving the electrochemical stability of the solid electrolyte system.
3Reliability
If protective layer is added to anode, then interfacial resistance is reduced, but device complexity increases
Solution Approach 1:
The protective layer is designed as a thin film structure comprising Ge-Sb-O glass and Ge-Sb-Se-O glass. This thin film approach reduces the added complexity while effectively lowering interfacial resistance, as the protective function is achieved with minimal additional material thickness and structural complexity.
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 protected anode significantly decreases interfacial resistance, inhibits short circuit occurrence, and improves electrochemical characteristics by increasing electrochemical stability and discharge capacity compared to batteries without the protective layer.
Implementation Method 1
depositing an oxide represented by Formula 1 on the anode active material layer to prepare a protected anode
Data Source
AI summary
A protected anode, an electrochemical device including the same, and a method of preparing the electrochemical device. The protected anode may include: an anode layer; and a protective layer including an oxide represented by Formula 1, on the anode layer:AxMyO1−x−y Formula 1In Formula 1, A is at least one of Ge, Sb, Bi, Se, Sn, or Pb; M is at least one of In, TI, Sb, Bi, S, Se, Te, or Po; A and M are different from each other; and 0<x<100 and 0<y<100.