Quasi-Solid Electrolyte Reducing Interface Resistance
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Solution Overview
Problem
Current solid state electrolytes face issues with low conductivity, high interface resistance, brittleness, poor film-forming ability, and safety concerns such as flammability and liquid leakage, which are not adequately addressed by existing organic, inorganic, or composite electrolytes.
Innovation Solution
A novel electrolyte composed of a polymerization product of a reactive additive with amide and epoxy or vinyl groups, a lithium salt, and an organic solvent, which undergoes a polymerization reaction to form a colloidal or quasi-solid state electrolyte, reducing interface resistance and enhancing safety by eliminating liquid leakage and flammability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic solid state electrolyte is used, then conductivity is improved, but interface resistance increases
Solution Approach 1:
The patent uses a composite structure combining inorganic solid electrolyte particles with organic polymer matrix and liquid electrolyte additives. This composite approach allows the system to achieve high conductivity from the inorganic phase while the organic components reduce interface resistance and improve wettability with electrodes, thus resolving the contradiction between high conductivity and low interface resistance.
Solution Approach 2:
The organic polymer matrix and liquid electrolyte components act as intermediaries between the inorganic solid electrolyte particles and the electrodes. These intermediary materials improve the interfacial contact and reduce contact resistance, allowing the inorganic electrolyte's high conductivity to be effectively utilized while minimizing interface resistance issues.
2Ease of manufacture
If organic polymer solid state electrolyte is used, then ease of manufacture is improved, but conductivity decreases
Solution Approach 1:
The patent creates a composite electrolyte system where organic polymer provides ease of manufacture and flexibility, while inorganic solid electrolyte particles provide high conductivity. The combination allows the system to inherit the processability advantages of organic materials and the conductivity advantages of inorganic materials, resolving the contradiction between ease of manufacture and conductivity.
Solution Approach 2:
The patent distributes inorganic solid electrolyte particles within the organic polymer matrix, creating local regions of high conductivity within the easily processable organic framework. This local quality approach allows different regions to contribute their strengths: the organic phase provides processability while the inorganic phases provide conductivity enhancement.
3Reliability
If inorganic ceramic electrolyte is used, then conductivity is improved, but mechanical properties worsen
Solution Approach 1:
The patent combines brittle inorganic ceramic electrolyte particles with flexible organic polymer matrix and liquid electrolyte components. The organic binder provides mechanical flexibility and toughness to the composite, preventing the overall structure from being as brittle as pure ceramic, while the inorganic particles maintain high conductivity. This resolves the contradiction between high conductivity and good mechanical properties.
Solution Approach 2:
The organic polymer matrix and liquid electrolyte components form a flexible continuous phase that surrounds and binds the inorganic ceramic particles, providing flexibility and mechanical robustness to the composite electrolyte structure, thus overcoming the brittleness of pure ceramic electrolytes while maintaining their high conductivity.
4Reliability
If liquid electrolyte is used, then conductivity is improved, but safety worsens
Solution Approach 1:
The patent uses a composite system where liquid electrolyte components provide high ionic conductivity, while inorganic solid electrolyte particles and organic polymer matrix provide structural integrity and safety. The inorganic particles reduce the amount of flammable liquid electrolyte needed, and the polymer matrix provides a flame-retardant framework, thus resolving the contradiction between conductivity and safety.
Solution Approach 2:
The patent changes the physical state parameters of the electrolyte system by combining liquid, solid, and composite phases. The liquid electrolyte provides conductivity, while the inorganic solid particles and polymer matrix change the overall system's physical properties to reduce flammability and prevent leakage, thus achieving both high conductivity and improved safety through parameter optimization.
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 electrolyte effectively reduces interface resistance, improves safety by being non-flammable, and maintains excellent ionic conductivity, leading to enhanced performance and longevity of lithium batteries.
Implementation Method 1
a polymer, which is a polymerization product of a reactive additive and an initiator
Data Source
AI summary
An electrolyte is provided. The electrolyte includes a polymer, a lithium salt, and an organic solvent. The polymer is a polymerization product of a reactive additive and an initiator, wherein the reactive additive includes at least an amide group and at least an epoxy group or ethyl group. A composition for electrolyte and a lithium battery employing the electrolyte are also provided.