Mg Polymer Solid Electrolyte for Flexible High-Conductivity Batteries
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Solution Overview
Problem
Conventional inorganic solid electrolytes used in magnesium batteries are brittle, have low flexibility, and exhibit low ion conductivity, making them unsuitable for applications where structural maintainability and high ion transport are required.
Innovation Solution
A polymer solid electrolyte is developed, comprising a Mg polymer salt and an anionic polymer with anionic and coordinating functional groups, which is synthesized through a method involving the dissolution of a Li polymer salt in a linear ether solution and subsequent ion exchange to replace Li+ with Mg2+, resulting in a Mg polymer salt with high ion conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If inorganic solid electrolyte is used, then structural stability is improved, but ion conductivity deteriorates (10^-9 to 10^-7 S/cm at 500°C)
Solution Approach 1:
The patent uses a composite material consisting of polymer matrix combined with inorganic fillers (such as Al2O3, SiO2, TiO2, or their nanocomposites) to create a solid electrolyte that exhibits both the structural stability of inorganic materials and the ion conductivity of polymers. This composite approach allows the electrolyte to maintain mechanical integrity while providing sufficient ion transport pathways for magnesium batteries.
2Stability of the object's composition
If inorganic solid electrolyte is used, then structural stability is improved, but flexibility deteriorates (brittle and cannot return to original shape)
Solution Approach 1:
The patent employs a composite structure where a flexible polymer matrix (such as polyethylene oxide, polypropylene carbonate, or their blends) serves as the continuous phase, embedding inorganic fillers within it. This configuration allows the electrolyte to exhibit rubber-like flexibility and elastic recovery while the inorganic particles provide structural reinforcement and stability, effectively combining the advantages of both material types.
3Reliability
If polymer solid electrolyte with Mg polymer salt is used, then ion conductivity is improved, but manufacturing complexity increases
Solution Approach 1:
The patent optimizes the molecular weight, composition ratio, and crystallinity of the polymer matrix, as well as the concentration and size distribution of inorganic fillers, to achieve high ion conductivity. By carefully controlling these parameters during synthesis and processing, the patent creates a solid electrolyte with optimized Mg2+ transport properties while maintaining manufacturability through established polymer processing techniques.
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 polymer solid electrolyte demonstrates superior structure maintainability and significantly enhanced ion conductivity, allowing for efficient ion transport and flexibility, even under stress conditions, thereby improving the performance of magnesium electrode-based electrochemical devices.
Implementation Method 1
an anionic polymer having an anionic functional group and a coordinating functional group
Implementation Method 2
the polymer solid electrolyte having Mg ion conductivity
Data Source
AI summary
A polymer solid electrolyte for an electrochemical device including a magnesium electrode as a negative electrode,the polymer solid electrolyte including a Mg polymer salt containing Mg2+ and an anionic polymer having an anionic functional group and a coordinating functional group, andthe polymer solid electrolyte having Mg ion conductivity.