Silicon-Sulfur Polymer Solid Electrolyte for Safe Lithium-Ion Batteries
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Solution Overview
Problem
Conventional lithium-ion secondary batteries using liquid electrolytes face issues such as leakage and combustion at high temperatures, and existing solid-state polymer electrolytes lack high ionic conductivity across a wide temperature range, limiting their effectiveness.
Innovation Solution
A silicon-sulfur polymer with specific structural units and crosslinking groups is developed, which, when combined with inorganic nanoparticles, enhances ionic conductivity and mechanical strength, forming a solid electrolyte suitable for solid-state lithium-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If liquid electrolyte solution is used in lithium-ion secondary batteries, then the battery can operate smoothly, but leakage and combustion occur at high temperatures
Solution Approach 1:
The patent transitions the electrolyte from liquid phase to solid phase by using a crosslinked polymer matrix. This phase transition eliminates the leakage and combustion issues associated with liquid electrolytes while maintaining ionic conductivity through the solid polymer structure.
Solution Approach 2:
The patent creates a composite solid electrolyte system combining crosslinked polymer matrices with lithium salts. This composite structure provides both the mechanical stability of solids and the ionic conductivity needed for battery operation, resolving the safety issues of liquid electrolytes.
2Reliability
If solid-state polymer electrolyte is used to eliminate liquid leakage, then battery safety is improved, but ionic conductivity at room temperature remains insufficient
Solution Approach 1:
The patent modifies the chemical and physical parameters of the polymer electrolyte by introducing crosslinking structures and selecting specific polymer compositions. These parameter changes enhance the ionic conductivity of the solid electrolyte at room temperature while preserving its safety advantages.
3Ease of manufacture
If conventional solid polymer electrolyte is used, then manufacturing is simplified, but ionic conductivity across wide temperature range is not achieved
Solution Approach 1:
The patent designs a dynamic crosslinked polymer structure that can adapt its ionic conduction properties across different temperature ranges. The crosslinking density and polymer composition are optimized to maintain effective ionic conductivity from low to high temperatures, expanding the operational temperature range.
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 silicon-sulfur polymer electrolyte achieves high lithium-ion conduction, thermal endurance, and improved safety, addressing the limitations of existing technologies by providing a stable and efficient solid electrolyte for lithium-ion batteries.
Implementation Method 1
Thus, cations, particularly lithium ions, are loaded at a high concentration into the solid electrolyte comprising the silicon-sulfur polymer, and this ensures that the material is capable of transmitting the cations, particularly the lithium ions, at a large throughput.
Data Source
AI summary
The present disclosure discloses a silicon-sulfur polymer, a solid electrolyte comprising the silicon-sulfur polymer, and a corresponding solid-state lithium-ion battery. The silicon-sulfur polymer of the present disclosure is a polymer compound comprising both an inorganic backbone-chain structure and an organic side-chain structure, and has the characteristics of both the organic polymer and the inorganic polymer as well as many unique properties. Therefore, the solid electrolyte formed by the silicon-sulfur polymer and the solid-state lithium-ion battery thereof have many good characteristics including a good lithium-ion-conduction capability, better thermal endurance, a wider range of operating temperatures, and better thermostability.