Fluorinated Amide Composite Electrolyte for Stable Solid-State Cells
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Solution Overview
Problem
Current lithium ion-conducting polymer electrolytes face limitations in ionic conductivity at room temperature and electrochemical performance due to interface resistance and poor distribution of solid electrolyte particles in solid-state batteries, while solid inorganic electrolytes suffer from mechanical strength reduction and electrochemical instability when enhanced with organic additives.
Innovation Solution
A composite material comprising inorganic particles, a fluorinated compound, and optionally a polymer, where the fluorinated compound is of a specific formula and the polymer is cross-linked, is used to improve ionic conductivity and electrochemical stability, with the fluorinated compound enhancing the interaction with inorganic particles and the polymer reducing crystallinity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If organic additives (carbonate esters, plasticizers) are added to composite electrolytes to improve ionic conductivity, then ionic conductivity increases, but mechanical strength decreases
Solution Approach 1:
The patent uses fluorinated cyclic carbonate esters with specific molecular structures (Formula I) where fluorine substitution at particular positions (R1-R6 groups) modifies the physical and chemical parameters of the additive. This structural parameter change allows achieving high ionic conductivity while maintaining adequate mechanical properties, resolving the trade-off between conductivity enhancement and mechanical strength preservation.
2Productivity
If organic additives are added to composite electrolytes to enhance ionic conductivity, then charge/discharge rates improve, but electrochemical stability deteriorates
Solution Approach 1:
The fluorinated cyclic carbonate ester structure (Formula I) with specific substituents (R1-R6) and functional groups (X1, X2) changes the electrochemical parameters of the additive. The fluorine atoms and specific molecular architecture provide both high ionic conductivity for fast charging and enhanced electrochemical stability, simultaneously improving productivity and reliability.
3Reliability
If inorganic particles are used as solid electrolytes to achieve high ionic conductivity, then lithium ion conduction improves, but interface resistance increases
Solution Approach 1:
The fluorinated cyclic carbonate ester acts as an intermediary substance between inorganic solid electrolyte particles and electrodes. It fills inter-particle voids and creates improved interfacial contact, mediating the interaction between solid particles and reducing interface resistance while preserving the high bulk ionic conductivity of the inorganic electrolyte.
Solution Approach 2:
The additive creates a porous or interconnected matrix structure between inorganic particles, allowing efficient lithium ion transport pathways while maintaining good particle-to-particle contact. This structural approach reduces interface resistance without compromising the intrinsic high ionic conductivity of the densified inorganic phase.
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 composite material achieves higher ionic conductivity and improved electrochemical stability, enabling faster charge/discharge rates and enhanced mechanical strength, addressing the limitations of both polymer and inorganic electrolytes.
Implementation Method 1
the fluorinated compound enhancing the interaction with inorganic particles
Implementation Method 2
the polymer reducing crystallinity
Implementation Method 3
Lithium ion-conducting polymer electrolytes enable the development of safer and more affordable manufacturing processes
Data Source
AI summary
The present technology relates to a composite material comprising inorganic particles, a fluorinated amide compound, and optionally an electrolyte polymer, plasticizer and/or salt, as well as to the process for preparing the composite material. Also described are solid electrolytes and electrode materials comprising the present composite material and their use in electrochemical cells and accumulators comprising them.