CNT-Bonded Lithium Cathode Composite for Stable High Energy Density
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Solution Overview
Problem
Lithium secondary batteries face safety issues due to frequent explosion accidents and have limitations in high energy density, structural instability, and low output characteristics, which are not adequately addressed by existing cathode materials.
Innovation Solution
A cathode composite material is developed using a Li—Mn—Ti—Al—O-based active material combined with acid-treated carbon nanotubes, where the carbon nanotubes are covalently or non-covalently attached to the surface of the active material, enhancing stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If lithium-rich-based material is used to achieve high capacity, then energy density is improved, but safety problems and structural instability occur
Solution Approach 1:
The patent uses a composite structure where lithium-rich-based material (providing high capacity) is combined with carbon nanotubes (providing structural stability and safety). The carbon nanotubes form a coating layer on the cathode material surface, creating a composite that maintains the high energy density benefits while eliminating the safety and stability problems of pure lithium-rich materials.
2Use of energy by moving object
If lithium-rich-based material is used to achieve high capacity, then energy density is improved, but structural instability occurs
Solution Approach 1:
The patent creates a composite material where the lithium-rich-based material is coated with carbon nanotubes. This composite structure provides the high energy density from the lithium-rich material while the carbon nanotube coating layer maintains structural stability during charge-discharge cycles.
Solution Approach 2:
The carbon nanotube coating acts as a flexible protective shell around the lithium-rich cathode material. This thin film structure allows volume changes during lithium insertion/extraction while maintaining overall structural integrity and preventing material degradation.
3Ease of manufacture
If conventional cathode materials are used, then manufacturing is simple, but output characteristics are low
Solution Approach 1:
The patent employs a composite structure combining conventional cathode materials with carbon nanotubes. This approach maintains the ease of manufacturing conventional materials while the carbon nanotube component significantly enhances output characteristics through improved electron transport and surface area.
Solution Approach 2:
The carbon nanotubes act as an intermediary substance between the cathode material and electrolyte. They facilitate faster electron transfer and ion diffusion, thereby improving output characteristics without complicating the overall manufacturing process.
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 high energy density, improved life characteristics, and reduced manufacturing costs for electric vehicles by stabilizing the cathode active material and enhancing electrochemical performance.
Implementation Method 1
the carbon nanotube (CNT) may be affixed to the cathode active material by covalent or non-covalent bonds
Implementation Method 2
the carbon nanotube (CNT) may be affixed to the cathode active material by covalent or non-covalent bonds
Implementation Method 3
the carbon nanotube suitably may be treated with an acid such that the acid-treated carbon nanotube may be attached to the surface of the Li—[Mn—Ti]—Al—O-based cathode active material
Implementation Method 4
when lithium ions are intercalated and deintercalated from the cathode and the cathode in a state where the electrolyte has been charged between the cathode and the cathode made of an active material capable of intercalations and deintercalation of the lithium ions
Implementation Method 5
The lithium secondary battery produces electric energy by the oxidation and reduction reactions
Implementation Method 6
The lithium secondary battery produces electric energy by the oxidation and reduction reactions
Data Source
AI summary
Disclosed are a cathode material for a lithium secondary battery and a method of manufacturing the same. For instance, the lithium secondary battery may have a high energy density by using only a single cathode material. Particularly, the cathode material for a lithium secondary battery includes a Li—[Mn—Ti]—Al—O-based cathode active material; and a carbon nanotube (CNT) attached to the surface of the cathode active material in an acid-treated state to be formed as a composite.