Nanoporous Battery Separators That Trap Transition Metal Ions
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Solution Overview
Problem
Existing lithium battery manufacturing processes are complex, expensive, and prone to safety issues due to metal fragments in the separator, and the migration of transition metals like manganese, nickel, and cobalt reduces battery cycle life.
Innovation Solution
The development of battery stacks and batteries that utilize a porous separator with an anionic compound, surface-modified inorganic oxides, and a reusable substrate, which inhibits the migration of transition metal ions and improves safety by eliminating the need for interleaving discrete battery layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional interleaving manufacturing process is used, then battery assembly can be completed, but the process is slow, complex and expensive
Solution Approach 1:
The patent combines multiple discrete battery layers (anode, separator, cathode, current collectors) into a single integrated structure by coating them sequentially on one side of a separator. This merging eliminates the need for complex interleaving assembly processes, reduces manufacturing steps, and enables faster production while maintaining battery functionality.
Solution Approach 2:
The patent segments the battery structure into distinct functional zones within a single layer assembly. By coating electrode materials, current collectors, and separators in specific patterns on different regions of the separator, it creates functionally segmented battery components that can be manufactured as one integrated unit rather than assembled from multiple discrete parts.
2Ease of manufacture
If metal substrates are used and slit into discrete stacks, then battery assembly is enabled, but metal fragments embed into separator causing safety issues
Solution Approach 1:
The patent extracts the current collector function from traditional metal foil substrates and relocates it to a coating applied directly onto the separator. This eliminates the metal substrate that would otherwise be slitted and generate dangerous metal fragments, while still providing the necessary electrical conductivity and structural support for the electrode.
Solution Approach 2:
The separator serves as an intermediary substrate that replaces the traditional metal current collector. By coating electrode materials directly onto the separator, the patent eliminates the need for separate metal substrates that require slitting, thereby preventing metal fragment generation while maintaining the electrical and structural functions of the current collector.
3Ease of manufacture
If manganese is used as cathode material to reduce cost, then battery cost decreases, but manganese dissolves and migrates onto separator and anode reducing cycle life
Solution Approach 1:
The patent converts the harmful dissolution and migration of manganese ions into a beneficial protective mechanism. The separator coating is specifically designed to interact with dissolved manganese ions, causing them to precipitate or adsorb onto the separator surface rather than migrating to the anode. This transforms the potential harm of manganese dissolution into a self-protecting mechanism that extends battery cycle life.
Solution Approach 2:
The separator coating acts as an intermediary barrier between the cathode and anode that selectively interacts with dissolved metal ions. It provides a controlled interface that allows ionic transport while preventing harmful metal ion migration, thereby protecting the anode from contamination and extending battery cycle life while enabling the use of cost-effective manganese-based cathode materials.
4Power
If nickel-rich NMC cathode is used to improve performance, then battery power increases, but nickel and cobalt ions diffuse through separator reducing cycle life
Solution Approach 1:
The patent converts the harmful diffusion of nickel and cobalt ions into a beneficial protective process. The separator coating is designed to interact with these dissolved metal ions, causing them to precipitate or adsorb onto the separator surface rather than reaching the anode. This transforms the potential harm of high-power nickel-rich NMC cathodes into a self-limiting process that maintains both high power output and extended cycle life.
Solution Approach 2:
The separator coating serves as a selective intermediary that enables the use of high-performance nickel-rich NMC cathodes while protecting against their inherent instability. It provides a controlled interface that permits necessary ionic transport for high power delivery while blocking the migration of nickel and cobalt ions to the anode, thereby maintaining both high power and long cycle life.
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
This approach reduces manufacturing costs, improves safety by preventing metal fragment embedding, and extends battery cycle life by controlling the migration of transition metals, all while enabling faster and more efficient production using automated processing equipment.
Implementation Method 1
the separator may further comprise an anionic compound... the anionic compound is complexed to the inorganic oxide
Implementation Method 2
the photosensitizer is complexed to the inorganic oxide... the photosensitizer initiates the polymerization of a monomer
Data Source
AI summary
Provided is a lithium battery, wherein the battery comprises an anode, a cathode, wherein the cathode comprises one or more transition metals, an electrolyte, and a porous separator interposed between the cathode and anode, wherein the separator comprises an anionic compound. Also provided are methods of manufacturing such batteries.