Hybrid Solid-State Electrolyte Coating for Low-Resistance Interfaces
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Solution Overview
Problem
Current lithium-ion batteries face challenges such as high interfacial resistance between solid-state electrolytes and electrodes, leading to low coulombic efficiency and safety concerns due to lithium dendrite formation and chemical short circuits.
Innovation Solution
The development of solid-state hybrid electrolytes with a layer of polymeric material disposed on the exterior surface of a solid-state electrolyte (SSE) to reduce interfacial resistance and prevent lithium dendrite penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solid-state electrolyte (SSE) is used to prevent lithium dendrite formation, then safety and electrochemical stability are improved, but interfacial resistance between SSE and electrodes increases
Solution Approach 1:
A polymeric coating layer is introduced as an intermediary between the solid-state electrolyte and the electrodes. This coating layer mediates the interface by reducing interfacial resistance while maintaining the dendrite-blocking capability of the SSE, thus resolving the contradiction between safety and interfacial resistance.
Solution Approach 2:
The invention creates a composite structure combining solid-state electrolyte with a polymeric coating layer. This composite material approach allows the system to benefit from both the high safety of SSE and the low interfacial resistance of polymers, simultaneously addressing both requirements.
2Ease of manufacture
If polymer separators are used in conventional batteries, then ease of manufacture is improved, but they cannot effectively prevent chemical or physical short circuits
Solution Approach 1:
The invention combines the manufacturing simplicity of polymer separators with the short-circuit prevention capability of solid-state electrolytes by creating a composite structure where the polymeric coating on SSE maintains processability while adding protective functionality.
Solution Approach 2:
The solid-state electrolyte coating is applied locally at the electrode-SSE interface where short circuits occur, providing targeted protection against chemical and physical short circuits while maintaining the overall ease of manufacture through simple coating processes.
3Productivity
If liquid organic electrolytes are used for high ionic conductivity, then ion conduction performance is improved, but flammability and chemical short circuits increase
Solution Approach 1:
The invention changes the physical state parameter of the electrolyte from liquid to solid (via polymeric coating on SSE), which fundamentally alters the safety profile by eliminating flammability while maintaining ionic conductivity through the solid-state polymer structure.
Solution Approach 2:
The polymeric coating acts as an intermediary that enables solid-state ion conduction, replacing the liquid electrolyte's conduction function while providing the safety benefits of solid-state materials, thus resolving the contradiction between conductivity and flammability.
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 use of solid-state hybrid electrolytes significantly reduces interfacial resistance, enhances electrochemical stability, and improves the safety and performance of lithium-ion batteries by preventing lithium dendrite growth and chemical short circuits.
Implementation Method 1
The use of solid-state hybrid electrolytes significantly reduces interfacial resistance
Implementation Method 2
Solid state electrolyte (SSE) has been recognized as a solution to deter Li dendrite formation by acting as a strong, impenetrable barrier
Implementation Method 3
Solid-state electrolyte is the key to providing high energy density and addressing the flammability and safety issue as well as challenges of chemical and physical short circuits by blocking migration of unwanted active materials
Data Source
AI summary
Provided are solid-state hybrid electrolytes. The hybrid electrolytes have a polymeric material layer, which may be a polymer copolymer layer or a gel polymer copolymer layer, disposed on at least a portion of an exterior surface or all of the exterior surfaces of a solid-state electrolyte. A hybrid electrolyte can form an interface with an electrode of an ion-conducting battery that exhibits desirable properties. The solid-state electrolyte can comprise a monolithic SSE body, a mesoporous SSE body, or an inorganic SSE having fibers et strands, which may be aligned. In the case of solid-state electrolytes that have strands, the strands can be formed using a sacrificial template. The hybrid solid-state electrolytes can be used in ion-conducting batteries, which may be flexible, ion-conducting batteries.