Graphene Compound with Vacancy Structure for Battery Electrode
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Solution Overview
Problem
Secondary batteries used in electric vehicles and portable terminals face challenges in increasing capacity, reducing size and weight, and maintaining durability and safety, particularly due to the repeated expansion and contraction of active materials during charging and discharging, which can lead to short-circuiting and reduced capacity.
Innovation Solution
A graphene compound with a vacancy structure, including fluorine-terminated carbon atoms, is used to enhance the conductivity and binding properties of the electrode, allowing for a higher proportion of active material and improved charge-discharge characteristics by forming a three-dimensional conductive path and suppressing material detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the proportion of active material in the electrode is increased to enhance capacity, then the discharge capacity increases, but the conductivity of the electrode deteriorates due to reduced conductive agent content
Solution Approach 1:
The patent combines the functions of conductive agent and binder into a single graphene compound material. This graphene compound simultaneously provides electrical conductivity and binding capabilities, eliminating the need for separate conductive agents and binders. By merging these functions, the electrode can achieve high active material content while maintaining sufficient conductivity through the graphene network.
Solution Approach 2:
The patent employs graphene compound as a composite material that integrates conductive and binding properties. This composite approach allows the electrode to achieve both high capacity (through high active material content) and good conductivity (through the graphene compound's inherent conductive properties and binding function).
2Reliability
If conventional conductive agents and binders are used to prevent active material collapse and short-circuiting, then electrode stability improves, but the proportion of active material decreases, reducing battery capacity
Solution Approach 1:
The graphene compound serves multiple functions simultaneously: it acts as a conductive agent to provide electrical conductivity, as a binder to hold active material particles together and prevent collapse, and as a structural support to prevent short-circuiting. This multi-functionality allows the electrode to achieve high stability with minimal non-active material content, maximizing the active material proportion.
Solution Approach 2:
The patent merges the roles of conductive agent and binder into a single graphene compound, eliminating the need for separate materials. This consolidation reduces the total amount of non-active material in the electrode, thereby increasing the active material proportion while maintaining both conductivity and structural stability.
3Duration of action of stationary object
If the amount of conductive agent and binder is increased to suppress active material collapse and short-circuiting, then electrode durability improves, but the capacity of the secondary battery decreases
Solution Approach 1:
The patent combines conductive agent and binder functions into a single graphene compound, reducing the total amount of non-active material needed. This allows the electrode to achieve sufficient durability and stability with minimal graphene compound content, thereby maximizing the active material proportion and battery capacity.
Solution Approach 2:
The patent changes the key parameter from using multiple separate materials (conductive agent + binder) to using a single graphene compound material. This parameter change optimizes the balance between durability and capacity by reducing the total non-active material content while maintaining necessary functional properties.
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 graphene compound increases the discharge capacity and rate characteristics of secondary batteries, providing a durable and safe solution with high energy density and stability, suitable for both vehicle and portable applications.
Implementation Method 1
A graphene compound including graphene is capable of making low-resistance surface contact; accordingly, the electrical conduction between an active material in the form of particles and the graphene compound can be improved
Implementation Method 2
one or both of a conductive agent and a binder included in an electrode can suppress at least one of the collapse of an active material and short-circuiting of a conductive path
Data Source
AI summary
A carbon material with excellent characteristics is provided. An electrode having excellent characteristics can be provided. A novel carbon material can be provided. A novel electrode can be provided. A graphene compound including a vacancy includes a plurality of carbon atoms and one or more fluorine atoms, and the vacancy is formed with the plurality of carbon atoms and one or more fluorine atoms. The vacancy includes a ring-shaped region composed of the plurality of carbon atoms, and one or more fluorine atoms terminated in the ring-shaped region, and the ring-shaped region is a 18- or more-membered ring.