Nano-Ceramic Battery Separator for Dendrite and Polysulfide Blocking
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Solution Overview
Problem
Conventional secondary battery separators face challenges in achieving ultra-thin film thickness while maintaining heat resistance and adhesion to electrodes, leading to issues with lithium dendrite penetration and polysulfide shuttle effects, which affect the durability and cycle life of batteries.
Innovation Solution
A secondary battery separator is designed with a substrate, a first nano-ceramic layer facing the cathode, an active adsorption layer, a second nano-ceramic layer facing the anode, and an adhesion layer, utilizing nano-ceramic particles and carbon compounds to enhance heat resistance, mechanical strength, and interfacial adhesion, preventing lithium dendrite penetration and suppressing the polysulfide shuttle effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the separator thickness is reduced to achieve ultra-thin film, then the energy density and productivity are improved, but the heat resistance and mechanical strength deteriorate
Solution Approach 1:
The patent applies composite materials by combining organic separator base layers with inorganic ceramic coatings (alumina, silica, boehmite) to create a multi-layer structure that achieves both ultra-thin thickness and high heat resistance. The ceramic layers provide thermal stability while the organic matrix maintains ion conductivity, resolving the contradiction between thinness and heat resistance.
Solution Approach 2:
The patent utilizes porous ceramic coatings with controlled pore structures that allow lithium ion transport while providing mechanical strength and heat resistance. The porous structure enables the separator to maintain ion conductivity despite reduced thickness, addressing the contradiction between thinness and functional performance.
2Productivity
If the separator thickness is reduced to achieve ultra-thin film, then the energy density is improved, but the mechanical strength and durability deteriorate
Solution Approach 1:
The composite structure of organic separator matrix reinforced with inorganic ceramic particles and layers provides enhanced mechanical strength despite reduced overall thickness. The ceramic phases act as reinforcement agents that prevent separator deformation and rupture during battery cycling.
Solution Approach 2:
The patent applies local quality by concentrating ceramic materials at critical interfaces (electrode-contact surfaces) where mechanical strength is most needed, while maintaining thinner regions in the bulk separator to preserve ion conductivity and energy density.
3Ease of manufacture
If conventional separator materials are used, then the manufacturing process is simple, but lithium dendrite penetration occurs leading to safety issues
Solution Approach 1:
The patent applies preliminary anti-action by pre-coating the separator surface with ceramic layers before battery assembly, creating a dendrite-blocking barrier that prevents lithium dendrite penetration from occurring in the first place. This proactive approach maintains manufacturing simplicity while dramatically improving safety.
4Stability of the object's composition
If strong adhesion between electrode and separator is required, then the interfacial stability is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the adhesion promoter function with the ceramic coating layer itself, eliminating the need for separate adhesion treatment steps. The ceramic particles are incorporated into the coating formulation to provide both structural integrity and strong bonding to electrode surfaces, reducing manufacturing complexity while improving interfacial 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 solution enables the creation of an ultra-thin film separator with improved durability, heat resistance, and adhesion, effectively blocking lithium dendrites and suppressing the polysulfide shuttle effect, thereby enhancing the stability and cycle life of secondary batteries.
Implementation Method 1
an active adsorption layer formed on the first nano-ceramic layer
Implementation Method 2
blocking lithium dendrite penetration
Data Source
AI summary
The present invention provides a secondary battery separator capable of guaranteeing the safety and performance of a secondary battery by improving the durability, heat resistance, adhesion to electrode, blocking lithium dendrite penetration, suppression of the polysulfide shuttle effect, and improving the cycle life of a secondary battery using the same.