Ion-Conducting Separator Membrane for Battery Resistance Reduction
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Solution Overview
Problem
Existing battery technologies face limitations due to high resistance in separator membranes, leading to inefficient energy storage and frequent replacement of lithium ion batteries, as well as challenges with zinc crossover in alkaline batteries, which hinder rechargeability and performance.
Innovation Solution
A separator membrane comprising an ion-conducting polymeric composition with specific copolymer characteristics, including a terpolymer of styrene, vinylbenzyl groups, and positively charged amine groups, designed to reduce resistance and limit zinc and copper ion transport, enhancing rechargeability and energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional separator membranes are used in batteries, then the battery structure is simple and easy to manufacture, but the resistance is high leading to inefficient energy storage and frequent replacement
Solution Approach 1:
The separator membrane is constructed as a composite material consisting of a polyolefin base layer combined with a functional coating layer containing ion-conducting polymers and metal complex catalysts. This composite structure reduces resistance and improves energy storage efficiency while maintaining manufacturability through layer-by-layer construction.
Solution Approach 2:
The invention changes the chemical and physical parameters of the separator membrane by incorporating metal complexes (Fe, Co, Ni, Cu, Mn) coordinated with nitrogen-containing ligands. These parameter changes enable catalytic activity that reduces resistance and improves battery performance without compromising structural integrity.
2Reliability
If alkaline battery chemistry is used, then reasonable energy density is achieved, but zinc crossover occurs during discharge and hydrogen formation during recharging preventing effective rechargeability
Solution Approach 1:
The separator membrane acts as an intermediary between the anode and cathode, incorporating metal complex catalysts that mediate the electrochemical reactions. These catalysts facilitate ion transport while preventing zinc crossover and suppressing hydrogen formation, enabling effective rechargeability of alkaline batteries.
Solution Approach 2:
The invention changes the electrochemical parameters at the separator membrane interface by introducing metal complexes with nitrogen-containing ligands. These parameter changes modify the local chemistry to prevent harmful side reactions (zinc crossover and hydrogen evolution) while maintaining efficient ion conduction for rechargeability.
3Productivity
If separator membrane with high resistance is used, then manufacturing is simple, but energy efficiency is poor leading to frequent battery replacement
Solution Approach 1:
The separator membrane uses a composite structure with ion-conducting polymers and metal complex catalysts embedded in a polyolefin matrix. This composite design reduces resistance and improves energy efficiency, extending battery lifespan while maintaining compatibility with existing manufacturing processes.
Solution Approach 2:
The invention changes the electrical and catalytic parameters of the separator membrane by incorporating metal complexes coordinated with nitrogen-containing ligands. These parameter changes reduce resistance and improve energy efficiency, thereby extending battery operational life and reducing replacement frequency.
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 new separator membrane achieves lower resistance and reduced zinc and copper ion crossover, improving the performance and rechargeability of batteries, with area-specific resistances reduced by over 70% compared to existing technologies, leading to more efficient energy storage and extended battery life.
Implementation Method 1
A separator membrane is provided comprising an ion-conducting polymeric composition
Implementation Method 2
designed to reduce resistance and limit zinc and copper ion transport
Data Source
AI summary
A battery comprises a separator membrane comprising an ion-conducting polymeric composition comprising a copolymer of Ra-Rs and Rb. Ra and Rb are each selected from the group consisting of linear alkyls, branched alkyls, cyclic alkyls, heteroalkyls, aryls, heteroaryls, alkylaryls, and heteroalkylaryls. Rs is a positively charged amine group or a positively charged phosphene group. The copolymer comprises at least 3% of each Ra and Rb by weight. Ra and Rb are different chemical constituents, and Ra-Rs is not vinylpyridine.