Lithiated Carbon Dot Polymer Solid Electrolyte Ionic Conductivity
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Solution Overview
Problem
Current polymer solid electrolytes in lithium batteries suffer from low ionic conductivity and lithium-ion transference number, limiting their cycle and rate performance.
Innovation Solution
A polymer solid electrolyte comprising a high molecular polymer and a lithiated carbon dot, where the lithiated carbon dot is obtained by lithiating a carbon dot with lithium hydroxide, is introduced, with the lithiated carbon dot uniformly dispersed to reduce crystallinity and enhance ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium salts are incorporated into polymer to form solid electrolyte, then the electrolyte can be formed, but the ionic conductivity remains low
Solution Approach 1:
The patent uses composite materials by combining polymer matrix with lithiated carbon dots (functionalized nanoparticles). This composite structure allows the electrolyte to achieve high ionic conductivity (10^-4 to 10^-3 S/cm) while maintaining a relatively simple two-component composition, resolving the contradiction between performance and complexity
Solution Approach 2:
The patent changes the chemical composition parameters by using specifically lithiated carbon dots with controlled lithium content and size (5-50 nm diameter). This parameter optimization enables high ionic conductivity without requiring complex multi-component formulations
2Reliability
If conventional lithium salts are used in polymer solid electrolyte, then the electrolyte structure is simple, but the lithium-ion transference number is low
Solution Approach 1:
The patent applies local quality by creating lithium-rich regions around the lithiated carbon dots within the polymer matrix. These localized lithium reservoirs provide high lithium-ion transference number (0.5-0.8) while the overall simple two-component structure maintains ease of manufacture
Solution Approach 2:
The lithiated carbon dots act as distributed lithium sources that copy and distribute lithium ions throughout the electrolyte matrix, ensuring high lithium-ion availability and transference number without requiring complex lithium salt formulations
3Reliability
If functionalized nanoparticles are added to improve electrolyte performance, then the ionic conductivity can be enhanced, but the device complexity increases
Solution Approach 1:
The patent extracts the complex functional groups from multiple different nanoparticles and concentrates them into a single type of functionalized nanoparticle (lithiated carbon dot). This extraction approach maintains high electrolyte performance while reducing the number of different materials and simplifying the overall composition
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 solution significantly improves ionic conductivity and lithium-ion transference number, enhancing the electrochemical properties of the solid electrolyte.
Implementation Method 1
the lithiated carbon dot, as a lithium salt, can dissociate out a carbon dot anion and a lithium cation in the battery reaction of the solid electrolyte
Implementation Method 2
since the lithiated carbon dot has a nanometer size and good dispersibility, it can be uniformly dispersed in the high molecular polymer, which can effectively reduce the crystallinity of the high molecular polymer matrix
Data Source
AI summary
The present disclosure provides a polymer solid electrolyte comprising a high molecular polymer and a lithiated carbon dot, wherein the lithiated carbon dot is obtained by lithiating a carbon dot with lithium hydroxide. The present application also provides a method for preparing a lithiated carbon dot and a method for preparing a polymer solid electrolyte. In the polymer solid electrolyte provided in the present application, the lithiated carbon dot is used as lithium salts, and the introduction of the lithiated carbon dot effectively reduces the crystal phase of the polymer matrix in the electrolyte, and significantly improves the electrochemical properties such as the ionic conductivity and ionic mobility of the polymer solid electrolyte.