Gel Polymer Electrolyte Composition for Dendrite-Resistant Li-Ion Cycling
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Solution Overview
Problem
Gel polymer electrolytes face challenges with low mechanical strength and difficulty in resisting lithium dendrite damage, leading to poor cycle performance and safety issues in lithium-ion batteries.
Innovation Solution
A lithium-ion electrolytic solution comprising a lithium salt, organic solvent, precursor, and additive, including zero-dimensional and quasi-zero-dimensional carbon nanomaterials and a plasticizer, is formulated to enhance mechanical strength and improve interface compatibility, thereby improving cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gel polymer electrolyte is used, then safety and mechanical stability are improved, but mechanical strength remains low and resistance to lithium dendrites is poor
Solution Approach 1:
The patent uses a composite gel polymer electrolyte system combining polyvinylidene fluoride (PVDF) polymer matrix with liquid electrolyte components (cyclic carbonates and chain carbonates). This composite structure integrates the mechanical stability and safety of solid polymers with the ionic conductivity and flexibility of liquid electrolytes, achieving both improved safety and enhanced mechanical properties through synergistic material combination.
2Reliability
If gel polymer electrolyte is used, then leakage risk is reduced, but contact with electrodes deteriorates leading to high interface impedance
Solution Approach 1:
The patent optimizes the ratio of cyclic carbonate to chain carbonate in the liquid electrolyte component, and adjusts the plasticizer content (3-12% by mass) to modify the gel polymer electrolyte's physical and chemical parameters. These parameter changes improve the electrolyte's wettability and interfacial contact with electrodes while maintaining low leakage risk, thereby reducing interface impedance.
3Stability of the object's composition
If gel polymer electrolyte is used, then cohesion of solid is achieved, but room-temperature cycle performance needs improvement
Solution Approach 1:
The patent introduces plasticizers (such as fluoroethylene carbonate, dimethyl carbonate, or diethyl carbonate) as intermediary substances that enhance the flexibility and ion transport capability of the gel polymer electrolyte at room temperature. These intermediaries facilitate lithium ion diffusion while maintaining the cohesive structure of the polymer matrix, thereby improving room-temperature cycle performance without compromising structural integrity.
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 good liquid retention capacity and reduces interface resistance, enhancing the room-temperature cycle performance of lithium-ion batteries.
Implementation Method 1
the graphene quantum dots guide the uniform nucleation and growth deposition of lithium as nucleation sites, thereby inhibiting the growth of dendrites
Implementation Method 2
Gel polymer electrolyte is an electrolyte formed by adding a corresponding plasticizer to an all-solid polymer electrolyte
Implementation Method 3
The gel polymer electrolyte combines the excellent characteristics of a polymer matrix with the excellent ionic conductivity of liquid organic electrolytes
Data Source
AI summary
In order to solve the problems of poor liquid retention capacity and poor cycle performance of a gel polymer electrolyte, provided is a lithium ion electrolytic solution, comprising a lithium salt, an organic solvent, a precursor, and an additive, wherein the additive comprises one or two of a zero-dimensional carbon nanomaterial and a quasi-zero-dimensional carbon nanomaterial, and a plasticizer. The gel polymer electrolyte is formed after the described lithium ion electrolytic solution is polymerized, has good liquid retention capacity, can keep good interfacial compatibility with an electrode, improves the interface resistance, and improves the normal-temperature cycle performance of the lithium ion battery. In addition, further provided is a corresponding lithium ion battery.