Silicate-Coated Sulfur Electrode for H2S Containment
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Solution Overview
Problem
Sulfur-based electrodes in non-aqueous electrolyte batteries face challenges with hydrogen sulfide gas generation when exposed to moisture, leading to safety concerns and reduced battery performance due to the elution of lithium polysulfide, which affects thermal conductivity and energy density.
Innovation Solution
An electrode design incorporating a silicate coating material with siloxane bonds or silica fine particle aggregates, applied to the sulfur-based active material layer, which traps hydrogen sulfide gas and suppresses its release, while maintaining thermal conductivity and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a sulfur-based active material layer is used in the electrode, then the energy density and thermal conductivity are improved, but hydrogen sulfide gas is generated when exposed to moisture, leading to safety concerns
Solution Approach 1:
An aluminum oxide coating layer is applied as an intermediary barrier between the sulfur-based active material and moisture from the outside environment. This coating layer physically blocks moisture penetration, preventing the chemical reaction that generates hydrogen sulfide gas, while allowing the sulfur-based material to maintain its energy density and thermal conductivity functions
Solution Approach 2:
A thin film coating of aluminum oxide is formed on the surface of the sulfur-based active material layer. This thin protective film prevents moisture contact and hydrogen sulfide generation while minimizing impact on the electrode's energy density and thermal properties
2Temperature
If a sulfur-based active material layer is used in the electrode, then the thermal conductivity is improved, but lithium polysulfide elutes into the electrolyte, reducing battery performance
Solution Approach 1:
The aluminum oxide coating serves as an intermediary barrier that prevents lithium polysulfide from eluting into the electrolyte while allowing thermal energy to pass through, thus maintaining both battery performance and thermal conductivity
Solution Approach 2:
The coating is applied specifically to the surface of the sulfur-based active material layer where contact with electrolyte and moisture occurs, providing localized protection against polysulfide elution while preserving the bulk thermal conductivity properties of the sulfur-based material
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
Effectively traps hydrogen sulfide gas and prevents its release, enhancing safety and performance by reducing lithium polysulfide elution and maintaining thermal conductivity and energy density.
Implementation Method 1
the coating material containing a silicate having a siloxane bond or a silica fine particle aggregate having a siloxane bond... traps hydrogen sulfide gas
Data Source
AI summary
To provide an electrode for non-aqueous electrolyte batteries, which traps hydrogen sulfide gas, generated from the inside thereof for some reason, in the electrode, and suppresses the outflow of hydrogen sulfide gas to the outside of the battery. An electrode for lithium ion batteries includes a coating material which contains a silanol group and is present on at least a surface of an active material layer. The active material layer contains a sulfur-based material and a resin-based binder. The sulfur-based material is an active material capable of alloying with lithium metal or an active material capable of occluding lithium ions. The coating material containing the silanol group is a silicate having a siloxane bond or a silica fine particle aggregate having a siloxane bond as a component.