Composite Gel Electrolyte Composition for Higher Ionic Conductivity
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Solution Overview
Problem
Conventional gel electrolytes in secondary batteries exhibit insufficient electrical conductivity, leading to deteriorated discharge characteristics.
Innovation Solution
An electrolyte composition comprising one or more polymers, oxide particles with a hydrophobic surface, at least one electrolyte salt selected from lithium, sodium, or magnesium salts, and an ionic liquid, where the oxide particles are surface-treated with silicon-containing compounds, and the polymer includes structural units like tetrafluoroethylene and vinylidene fluoride, enhancing ionic conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional gel electrolytes are used to prevent combustion, then safety is improved, but electrical conductivity is insufficient leading to deteriorated discharge characteristics
Solution Approach 1:
The patent uses a composite gel electrolyte system combining polymer matrix (PVDF-HFP), ionic liquid ([EMIM][TFSI]), and oxide particles (SiO2, Al2O3, TiO2) to achieve both safety and high electrical conductivity. The ionic liquid provides high ion transport capability while the polymer gel structure prevents combustion, and oxide particles enhance stability and conductivity.
Solution Approach 2:
The patent optimizes the composition ratios of polymer, ionic liquid, and oxide particles to achieve optimal electrical conductivity and discharge characteristics. By adjusting the content of ionic liquid (30-70 wt%) and oxide particles (10-50 wt%), the system achieves both safety and high performance.
2Object-affected harmful factors
If gel electrolyte is used to reduce electrolyte solution amount, then combustion prevention is improved, but electrical conductivity decreases
Solution Approach 1:
The ionic liquid acts as an intermediary substance that bridges the polymer matrix and oxide particles, providing a liquid-like ion transport medium within the gel structure. This enables the system to maintain gel-state safety while achieving liquid-like electrical conductivity through the ionic liquid's high ion mobility.
3Loss of energy
If oxide particles are added to enhance conductivity, then discharge characteristics are improved, but manufacturing complexity increases
Solution Approach 1:
The oxide particles (SiO2, Al2O3, TiO2) create a porous network structure within the gel electrolyte that enhances ion transport pathways. This porous structure improves discharge characteristics by facilitating electrolyte penetration and ion diffusion while maintaining structural integrity.
Solution Approach 2:
The patent specifies optimal particle size ranges (0.1-10 μm) and content ratios (10-50 wt%) for oxide particles to balance performance enhancement with manufacturing feasibility. These parameter optimizations ensure that the added complexity is justified by the significant improvement in discharge characteristics.
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 proposed electrolyte composition significantly improves the discharge characteristics of secondary batteries by enhancing ionic conductivity and retaining the ionic liquid, leading to better battery performance.
Implementation Method 1
The electrical conductivity of conventional gel electrolytes as mentioned above are insufficient. The proposed electrolyte composition significantly improves the discharge characteristics of secondary batteries by enhancing ionic conductivity
Implementation Method 2
the oxide particles having a hydrophobic surface... leading to better battery performance
Data Source
AI summary
There is disclosed an electrolyte composition comprising one or two or more polymers, oxide particles having a hydrophobic surface, at least one electrolyte salt selected from the group consisting of a lithium salt, a sodium salt, a calcium salt, and a magnesium salt, and an ionic liquid.