Silver Oxyfluoride Perovskite Electrodes for High Energy Density Batteries
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Solution Overview
Problem
Current lithium-ion battery materials have limited energy density and environmental compatibility, with positive electrode materials like LiCoO2 offering low specific capacity and intercalation processes being inefficient for energy storage.
Innovation Solution
Development of silver metal oxyfluoride compounds with nanocrystallite size and perovskite structure, combined with conductive matrices, to enhance electronic conductivity and voltage capabilities, leading to higher specific and volumetric energy densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If intercalation materials like LiCoO2 are used in positive electrodes, then environmental compatibility and safety are improved, but specific capacity and energy density deteriorate (only 150 mAh/g)
Solution Approach 1:
The patent changes the fundamental reaction mechanism from intercalation to reversible conversion, allowing the positive electrode material to utilize all oxidation states and achieve much higher specific capacities (up to 900 mAh/g for Ag2F) while maintaining environmental compatibility by using non-toxic metals like silver instead of cobalt
Solution Approach 2:
The patent creates composite materials combining metal fluorides (AgF, Ag2F) with conductive matrices (carbon, metal oxides) to simultaneously achieve high specific capacity through conversion reactions and maintain good electronic conductivity, resolving the contradiction between capacity and conductivity inherent in pure fluoride materials
2Power
If metal fluorides are used to achieve high voltage and high specific energy, then electronic conductivity deteriorates due to high band gap
Solution Approach 1:
The patent combines high-voltage metal fluorides (AgF with 3.74V, Ag2F with 4.5V) with conductive matrices such as carbon black, carbon nanotubes, or conductive metal oxides to create composite electrodes that maintain both high voltage capabilities and sufficient electronic conductivity for practical battery operation
Solution Approach 2:
The conductive matrix acts as an intermediary that facilitates electron transport between the electronically insulating fluoride particles and the current collector, enabling the high-voltage fluoride materials to function effectively in electrochemical cells
3Reliability
If nanocomposite structures are used to enable electrochemical activity of metal fluorides, then manufacturing complexity increases
Solution Approach 1:
The patent divides the electrode into discrete fluoride particles dispersed within a continuous conductive matrix, creating a nanocomposite structure where each particle can undergo conversion reactions independently while the matrix provides overall conductivity and structural integrity
Solution Approach 2:
The conductive matrix creates a porous or networked structure that allows electrolyte penetration to reach the fluoride particles while maintaining electronic conductivity pathways, enabling effective electrochemical activity without requiring complex nanoscale fabrication
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 silver oxyfluoride compounds demonstrate reversible specific capacities from 400 to 900 mAh/cc and volumetric capacities from 550 to 800 mAh/cc, surpassing traditional materials in energy density and stability, while maintaining high electronic conductivity.
Implementation Method 1
An alternative process reversible conversion, allows for all of the oxidation states of a compound to be utilized. The reversible conversion reaction proceeds as follows: zLi++ze−+MeXLizX+Me where Me is a metal and X is O2−, S2−, N3− or F−.
Implementation Method 2
silver metal oxyfluoride compounds with nanocrystallite size and perovskite structure, combined with conductive matrices, to enhance electronic conductivity and voltage capabilities
Data Source
AI summary
The present invention relates to a novel class of silver oxyfluoride based electrode materials based on the perovskite structure used in primary and rechargeable electromechanical energy storage systems.