Ceramic-Polymer Nanocomposite Electrolyte for Low-Temperature Conductivity
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Solution Overview
Problem
Solid-state polymer electrolytes face challenges with low ionic conductivity at low temperatures and mechanical strength issues, which hinder their suitability for cold zone applications and lithium dendrite growth, affecting the performance and stability of lithium-ion batteries.
Innovation Solution
A ceramic-polymer nanocomposite solid-state electrolyte with AlxLi7-xLa3Zr1.75Ta0.25O12 ceramic nanoparticles embedded in an amorphous polymer matrix and plasticizers like dimethyl sulfoxide, succinonitrile, and ethylene carbonate, enhancing ionic conductivity and mechanical strength across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plasticizers are added to improve polymer chain mobility and ionic conductivity at room temperature, then ionic conductivity increases, but mechanical strength decreases allowing Li dendrite penetration
Solution Approach 1:
The patent combines polymer electrolyte with ceramic nanoparticles (such as Al2O3, SiO2, TiO2, or ZrO2) to create a composite solid-state electrolyte. The ceramic phase provides mechanical reinforcement and dendrite resistance while the polymer matrix maintains ionic conductivity through its flexible chains and plasticizer additives, thus resolving the contradiction between mechanical strength and ionic conductivity.
2Reliability
If ceramic nanoparticles are incorporated to enhance mechanical strength and suppress Li dendrite growth, then cycling stability improves, but ionic transport properties degrade at low temperatures
Solution Approach 1:
The patent optimizes the size of ceramic nanoparticles (using nano-scale particles rather than micro-scale) and their concentration within the polymer matrix to balance mechanical reinforcement with ionic transport. The nano-scale ceramic particles provide sufficient mechanical strength while minimizing their blocking effect on ion pathways, and the polymer matrix's inherent flexibility compensates for low-temperature viscosity increases, maintaining adequate ionic conductivity across a wide temperature range.
3Object-affected harmful factors
If solid-state electrolytes are used to replace organic liquid electrolytes for safety, then flammability and toxicity are reduced, but ionic conductivity and mechanical strength are insufficient
Solution Approach 1:
The patent creates a composite solid-state electrolyte combining polymer matrix with ceramic nanoparticles, where the polymer provides flexible ion transport pathways and the ceramic reinforcement enhances mechanical strength and thermal stability. This composite structure achieves both safety benefits of solid-state electrolytes and sufficient ionic conductivity for practical battery applications.
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 achieves high ionic conductivity (above 1×10−3 S/cm at room temperature) and excellent cycling stability, enabling batteries to perform well in cold zones and meeting high energy density and quick charging requirements.
Implementation Method 1
the particles afford ionic transport channels which facilitate ion transport within the ceramic-polymer solid electrolyte layer
Implementation Method 2
The addition of plasticizers to the solid polymer electrolyte improves the polymer chain mobility at room temperature which results in an increase in the ionic conductivity
Data Source
AI summary
Ceramic-polymer film includes a polymer matrix, plasticizers, a lithium salt, and a ceramic nanoparticle, LLZO: AlxLi7-xLa3Zr1.75Ta0.25O12 where x ranges from 0 to 0.85. The nanoparticles have diameters that range from 20 to 2000 nm and the film has an ionic conductivity of greater than 1×10−4 S/cm (−20° C. to 10° C.) and larger than 1×10−3 S/cm (≥20° C.). Using a combination of selected plasticizers to tune the ionic transport temperature dependence enables the battery based on the ceramic-polymer film to be operable in a wide temperature window (−40° C. to 90° C.). Large size nanocomposite film (area ≥8 cm×6 cm) can be formed on a substrate and the concentration of LLZO nanoparticles decreases in the direction of the substrate to form a concentration gradient over the thickness of the film. This large size film can be employed as a non-flammable, solid-state electrolyte for lithium electrochemical pouch cell and further assembled into battery packs.