Lithium Metal Anode Protective Layer for Dendrite Suppression
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Solution Overview
Problem
Lithium metal anodes in lithium batteries are prone to dendrite growth and reactivity with electrolytes, leading to reduced battery lifetime and stability due to their high reactivity, which existing protective layers fail to adequately address.
Innovation Solution
A negative electrode with a protective layer made of a block copolymer having a structural domain and a hard domain covalently linked, where the structural domain includes structural blocks and the hard domain includes olefin repeating units, providing improved mechanical characteristics and ionic conductivity to suppress dendrite growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lithium thin film is used as the anode, then the energy density is improved, but the reactivity with liquid electrolyte increases and dendrite growth occurs
Solution Approach 1:
The patent uses a composite protective layer comprising a block copolymer with distinct structural domains and hard domains. The structural domains provide flexibility and ionic conductivity, while the hard domains provide mechanical strength and dendrite suppression. This composite structure allows the lithium thin film to maintain high energy density while being protected from electrolyte reactivity and dendrite growth, thus resolving the contradiction between energy density and stability.
2Reliability
If a protective layer is added to prevent dendrite growth, then the stability is improved, but the ionic conductivity may be reduced
Solution Approach 1:
The protective layer is designed with local quality differentiation through its block copolymer structure. The structural domains are specifically engineered to provide high ionic conductivity pathways for lithium ion transport, while the hard domains are positioned to provide mechanical strength and dendrite suppression. This spatial differentiation of properties within the protective layer allows it to simultaneously improve stability and maintain ionic conductivity, resolving the contradiction between these two parameters.
Data Source
AI summary
A negative electrode for a lithium battery, including a lithium metal; and a protective layer disposed on at least a part of the lithium metal, wherein the protective layer includes a block copolymer including a structural domain and a hard domain covalently linked to the structural domain, wherein the structural domain includes a structural block of the block copolymer, wherein the hard domain includes a hard block of the block polymer, wherein the structural block includes a plurality of structural repeating units, and wherein the hard block includes a plurality of olefin repeating units.