Black Phosphorus-Polymer Solid Electrolyte Ionic Conductivity
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Solution Overview
Problem
PEO-based polymer all-solid electrolytes in lithium-ion batteries suffer from low ionic conductivity, which hinders their industrial application due to their lower conductivity compared to conventional organic solvent electrolytes.
Innovation Solution
A black phosphorus-polymer composite solid electrolyte is developed, incorporating oxidized black phosphorus dispersed in a polymer network structure with a lithium or sodium salt compound, enhancing ionic conductivity and mechanical properties through an organic/inorganic composite structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PEO-based polymer all-solid electrolyte is used to replace organic solvent electrolyte, then safety management is improved and electrode volume expansion is suppressed, but ionic conductivity deteriorates to about 10^-5 S/cm
Solution Approach 1:
The patent uses composite materials by combining PEO-based polymer with black phosphorus particles and lithium salt compounds. The black phosphorus particles with oxygen-containing functional groups are dispersed in the PEO matrix, creating a composite structure that enhances ionic conductivity while maintaining the safety benefits of solid electrolytes. This composite approach allows the electrolyte to achieve higher ionic conductivity compared to pure PEO-based electrolytes.
2Stability of the object's composition
If PEO-based polymer all-solid electrolyte is used to replace organic solvent electrolyte, then electrode volume expansion is suppressed, but ionic conductivity deteriorates to about 10^-5 S/cm
Solution Approach 1:
The patent employs composite materials by integrating black phosphorus particles with oxygen-containing functional groups into the PEO polymer matrix. This composite structure provides both the volume stability benefit of solid electrolytes and enhanced ionic conductivity through the synergistic interaction between the polymer matrix and black phosphorus particles, achieving a balance between structural stability and ionic transport.
3Object-generated harmful factors
If organic/inorganic composite structure is formed with black phosphorus dispersed in polymer network, then ionic conductivity is enhanced, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by controlling the size, concentration, and surface functionalization of black phosphorus particles. By optimizing these parameters (particle size distribution, oxygen-containing functional group content, and dispersion concentration), the patent enhances ionic conductivity while managing the complexity of the composite structure. The systematic control of material parameters allows for improved performance without excessive complexity.
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 black phosphorus-polymer composite electrolyte achieves high electrochemical stability and ionic conductivity, along with improved mechanical properties, effectively addressing the limitations of PEO-based electrolytes by increasing the non-uniformity of the polymer network and enhancing ionic conductivity.
Implementation Method 1
black phosphorus has an oxygen containing functional group introduced thereto
Data Source
AI summary
Disclosed is a black phosphorus-polymer composite solid electrolyte including a polymer network structure in which nanofibers made of a second polymer material are connected to each other; a first polymer material received in the polymer network structure and having ionic conductivity; black phosphorus dispersed in the first polymer material, wherein the black phosphorus has an oxygen containing functional group; and a lithium salt compound contained in the first polymer material.