Sulfur-Bonded Anode Coating for Dendrite-Resistant Solid-State Batteries
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Solution Overview
Problem
All-solid-state batteries using lithium metal as a negative electrode face issues with lithium volume expansion and irreversible dendrite growth, leading to low power characteristics and short-circuit phenomena.
Innovation Solution
A negative electrode coating composition for all-solid-state batteries, where metal and carbon-based materials are chemically bonded through sulfur, with a peak at 160 eV to 162 eV in the S2p spectrum, ensuring uniform dispersion and preventing metal coagulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium metal is used as a negative electrode to increase energy density, then energy density is improved, but lithium volume expansion and irreversible dendrite growth occur causing short-circuit phenomena
Solution Approach 1:
The patent uses a composite material consisting of metal particles (3-40 wt%) and carbon-based material (60-97 wt%) to form the negative electrode coating layer. This composite structure combines the high energy density advantage of metal with the structural stability and dendrite-prevention properties of carbon, resolving the contradiction between energy density and reliability
Solution Approach 2:
The patent changes the chemical bonding parameters by introducing sulfur-containing compounds that form strong chemical bonds between metal and carbon-based materials. This parameter change creates a stable composite structure that prevents lithium dendrite growth while maintaining high energy density, addressing both the energy density improvement and short-circuit prevention requirements
2Power
If metal particles are dispersed in carbon-based material, then electrical conductivity is improved, but metal particles tend to coagulate reducing performance
Solution Approach 1:
The patent uses sulfur-containing compounds as intermediaries that chemically bond to both metal particles and carbon-based materials. This intermediary creates strong interfacial bonding that stabilizes the dispersion of metal particles in the carbon matrix, preventing coagulation while maintaining electrical conductivity
Solution Approach 2:
The patent changes the interaction parameters between metal and carbon by introducing chemical bonding through sulfur-containing compounds. This parameter change from physical mixing to chemical bonding stabilizes the metal particle dispersion and prevents coagulation, resolving the contradiction between conductivity and compositional stability
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 strong bonding between metal and carbon in the coating composition enhances electrical conductivity and prevents lithium dendrite formation, improving cycle-life characteristics and reducing the risk of short circuits.
Implementation Method 1
the metal and carbon-based material are chemically bonded through sulfur
Implementation Method 2
heat treating the supported product
Data Source
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AI summary
Disclosed are a negative electrode coating composition for an all-solid-state battery and an all-solid-state battery including the same, the negative electrode coating composition for an all-solid-state battery including a metal and a carbon-based material, wherein the metal and carbon-based material are chemically bonded through sulfur.