Modified Carbon Fluoride for Stable Lithium/Fluorocarbon Batteries
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Solution Overview
Problem
Existing lithium/fluorocarbon batteries face issues with side reactions between fluorocarbon and electrolyte due to reactivity, requiring pre-charging steps that can compromise safety and are costly for large-scale production, and existing coatings do not fundamentally reduce these reactions.
Innovation Solution
A modification method using a composite solvent of water and ether solvent to treat fluorocarbon, removing unstable components like C—F bonds and atomic fluorine, improving chemical stability and reducing side reactions without pre-charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cyclic phosphate is added to form a passivation layer, then the electrolyte contact with fluorocarbon is prevented, but pre-charging is required which may produce lithium dendrites and puncture the separator
Solution Approach 1:
The patent extracts and removes unstable components (reactive fluorocarbon species) from the positive electrode material through treatment with lithium hydroxide solution, eliminating the source of side reactions and making pre-charging unnecessary
Solution Approach 2:
The patent converts the harmful reactivity of fluorocarbon with electrolyte into a benefit by using controlled chemical treatment to remove unstable components, transforming the problem of high reactivity into a method for purifying and stabilizing the material
2Reliability
If fluorocarbon coating is applied to prevent electrolyte contact, then storage performance is improved, but the preparation process becomes complicated and costly
Solution Approach 1:
The patent extracts unstable components through chemical treatment with lithium hydroxide, eliminating the need for complex coating processes while achieving the same protective effect
Solution Approach 2:
The patent changes the chemical state of fluorocarbon by removing unstable components through base treatment, transforming the material properties to achieve stability without requiring additional coating layers
3Reliability
If coating methods are used to block direct contact, then side reaction is slowed down, but the side reaction between fluorocarbon and electrolyte is not fundamentally reduced
Solution Approach 1:
The patent uses the reactivity of lithium hydroxide to selectively remove unstable fluorocarbon components, converting the problem of chemical instability into a purification process that fundamentally enhances chemical stability
Solution Approach 2:
The patent extracts and removes the source of side reactions (unstable fluorocarbon species) through chemical treatment, fundamentally eliminating rather than just slowing down side reactions
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 method enhances the storage stability of lithium/fluorocarbon batteries by reducing side reactions, maintaining capacity, and is suitable for large-scale production with improved safety and cost-effectiveness.
Implementation Method 1
the fluorocarbon is modified with a composite solvent, and under the synergistic effect of the water and the ether solvent, the unstable components in the fluorocarbon material can be effectively removed
Implementation Method 2
the chemical stability of the material can be improved, and the side reaction between the fluorocarbon and the electrolyte can be reduced, so as to improve the storage stability of the lithium/fluorocarbon battery
Data Source
AI summary
Provided are a carbon fluoride modification method, modified carbon fluoride and a lithium/carbon fluoride battery. The modification method comprises: mixing carbon fluoride with a composite solvent, subjecting same to a modification treatment, and then performing solid-liquid separation, so as to obtain modified carbon fluoride, wherein the composite solvent comprises water and an ether solvent. The composite solvent is used to modify carbon fluoride; and under the synergistic effect of water and the ether solvent, unstable components in a carbon fluoride material can be removed by means of reaction, thereby improving the chemical stability of the carbon fluoride material and reducing side reactions of carbon fluoride with an electrolyte solution, and therefore the storage stability of a lithium/carbon fluoride battery is improved. The modification method is simple and feasible, does not need the step of pre-charging, and is easy to implement and suitable for large-scale production.