Composite Solid Electrolyte Bridging Conductivity and Electrode Compatibility
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Solution Overview
Problem
Existing lithium-ion batteries face safety issues with conventional organic liquid electrolytes, and single-component inorganic or polymer electrolytes fail to meet the requirements of high ionic conductivity and compatibility with high-voltage positive electrode materials.
Innovation Solution
A polycarbonate-based organic-inorganic composite solid electrolyte is prepared using a silane coupling agent to form chemical bonds between inorganic and organic materials, enhancing ionic conductivity and electrochemical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If inorganic solid electrolyte is used, then mechanical strength and room temperature ionic conductivity are improved, but density and interface compatibility deteriorate
Solution Approach 1:
The patent uses composite materials by combining inorganic solid electrolyte particles (providing mechanical strength and ionic conductivity) with polymer matrix (reducing density and improving flexibility). This composite structure allows the electrolyte to maintain high mechanical strength while reducing overall density and improving interface compatibility with electrodes.
2Reliability
If inorganic solid electrolyte is used, then room temperature ionic conductivity is improved, but interface compatibility with electrodes deteriorates
Solution Approach 1:
The composite structure combines inorganic electrolyte particles with polymer matrix, where the polymer phase provides good interface compatibility with electrodes while the inorganic particles maintain high ionic conductivity. The synergistic effect resolves the contradiction between conductivity and compatibility.
Solution Approach 2:
The polymer matrix acts as an intermediary between the inorganic electrolyte particles and the electrodes, improving interface compatibility while allowing the inorganic particles to maintain their high ionic conductivity. The polymer phase mediates the interaction between rigid inorganic particles and flexible electrode surfaces.
3Adaptability or versatility
If polymer solid electrolyte is used, then compatibility with lithium metal and flexibility are improved, but ionic conductivity deteriorates
Solution Approach 1:
The patent creates a composite where polymer matrix provides compatibility with lithium metal and flexibility, while dispersed inorganic solid electrolyte particles provide high ionic conductivity. This composite approach allows both advantages to coexist, resolving the contradiction between compatibility and conductivity.
4Ease of manufacture
If single-component electrolyte is used, then preparation process is simple, but performance requirements for high voltage are not met
Solution Approach 1:
The composite electrolyte combines polymer and inorganic components, where the polymer provides ease of processing and the inorganic particles expand the electrochemical window for high-voltage applications. The synergistic combination maintains relative manufacturing simplicity while achieving high-voltage compatibility.
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 composite electrolyte achieves high ionic conductivity (3.1×10−3 S cm−1) and a wide electrochemical window (5.3 V/vs. Li+/Li), improving charge and discharge performance and cycle stability.
Implementation Method 1
chemical bonds are formed between the functionalized coupling agent and the inorganic and organic materials
Implementation Method 2
high ionic conductivity (3.1×10−3 S cm−1)
Implementation Method 3
inorganic ion conductor
Data Source
AI summary
The invention discloses a preparation and application method of a high ionic conductivity polymer-based composite solid electrolyte, and belongs to the technical field of lithium-ion battery electrolytes. The organic-inorganic composite solid electrolyte is prepared by compounding a carbonate-based polymer, a conductive lithium salt, a porous support material, a functionalized silane coupling agent and an inorganic ion conductor material. The polycarbonate-based polymer electrolyte has high ionic conductivity, a wide electrochemical window and a high ion transference number; the functionalized silane coupling agent can form chemical bonds and interact with the polymer and the inorganic material to play a bridge role between the polymer and the inorganic filler, so that the ionic conductivity of the polymer electrolyte is improved, the electrochemical window of the polymer electrolyte is widened, the interface contact between the solid electrolyte and positive and negative electrodes is improved, and the electrochemical performance of the solid electrolyte is improved. Therefore, the charge-discharge performance of the lithium-ion battery is improved. The method is suitable for a lithium-ion solid-state battery of a high-voltage positive electrode material.