Zeolite-Coated Separator for Thermal Stability in Lithium-Ion Batteries
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Solution Overview
Problem
Lithium-ion batteries are prone to fires and explosions under stress and have limited cycle life at elevated temperatures, requiring extensive cooling and complex systems.
Innovation Solution
A non-flammable electrode-supported zeolite separator and organic electrolyte for lithium-ion batteries, utilizing a substrate with a zeolite coating and a salt-concentrated electrolyte, enhancing wettability and stability at high temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polymer separators are used in lithium-ion batteries, then the battery structure is simple and easy to manufacture, but the battery is prone to fires and explosions under thermal stress and has limited cycle life at elevated temperatures
Solution Approach 1:
The patent uses a composite separator structure consisting of a porous substrate (polyolefin or ceramic) coated with a zeolite layer. This composite material combines the mechanical strength and porosity of the substrate with the thermal stability and fire resistance of zeolite, achieving both improved reliability and controlled complexity
Solution Approach 2:
The patent employs porous zeolite particles with specific pore sizes (0.3-1.0 μm) coated on the separator surface. The porous structure allows electrolyte penetration while providing thermal stability and fire resistance, resolving the contradiction between reliability improvement and structural complexity
2Duration of action of stationary object
If extensive cooling systems are implemented to maintain operation below 40°C, then the battery can maintain cycle life, but the device complexity and manufacturing cost increase
Solution Approach 1:
The zeolite-coated separator provides inherent thermal stability and fire resistance, allowing the battery to operate safely at elevated temperatures (up to 65°C) without requiring external cooling systems. The separator itself serves the function of thermal management, eliminating the need for complex cooling infrastructure
Solution Approach 2:
The patent changes the operational temperature parameter from the conventional <40°C limit to up to 65°C by using zeolite-coated separators. This parameter change eliminates the need for extensive cooling systems while maintaining acceptable cycle life, reducing device complexity
3Reliability
If the zeolite particle diameter is reduced to improve wettability and electrolyte access, then the electrochemical performance improves, but the manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the zeolite particle size parameter to a specific range (0.3-1.0 μm, preferably 0.5-0.8 μm). This parameter optimization balances wettability and electrolyte access with manufacturing feasibility, achieving good electrochemical performance without excessive precision requirements
Solution Approach 2:
The patent applies zeolite coating with controlled thickness (3-10 μm) and specific particle size distribution to achieve uniform wettability across the separator surface. This local quality control ensures consistent electrochemical performance while maintaining manufacturability
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 solution provides stable performance up to 65°C, increased cycle life, reduced overheating risk, and simpler cooling requirements, leading to cost-effective and efficient battery production for various applications.
Implementation Method 1
The electrode-supported zeolite separators have a porous crystalline structure with superior wettability to salt-concentrated electrolytes as compared to commercially used polymer separators
Implementation Method 2
The zeolite particles are hydrophobic and have an average diameter smaller than an average pore size of inter-particle pores of the substrate
Data Source
AI summary
A lithium-ion battery separator includes a substrate defining inter-particle pores and a zeolite coating on a surface of the substrate. The zeolite coating includes zeolite particles. The zeolite particles are hydrophobic and have an average diameter smaller than an average pore size of inter-particle pores of the substrate, such that some of the zeolite particles are positioned in some of the inter-particle pores. The separator is non-flammable In a lithium-ion battery, the substrate is a first electrode, and a second electrode is in direct contact with the zeolite coating. The lithium-ion battery includes a non-flammable salt-concentrated electrolyte, and the zeolite coating has a high wettability for the electrolyte. The lithium-ion battery is non-flammable.