Carbon Nanotube Anode with Titanium Dioxide for Lithium-Ion Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional carbon nanotube anodes in lithium-ion batteries suffer from low energy density, significant lattice changes, and the formation of lithium dendrites, which lead to electrode collapse and poor solid electrolyte interface (SEI) layer formation, resulting in limited operating voltage and capacity retention.
Innovation Solution
A lithium-ion battery anode comprising a flexible carbon nanotube film with uniformly dispersed titanium dioxide nanoparticles, which enhances lithium storage capacity and stability by forming a continuous titanium dioxide layer, improving contact with electrolytes and ions, and maintaining structural integrity even when bent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional carbon nanotube anodes are used, then the anode structure is simple and easy to manufacture, but the energy density is low and lattice change is large during lithium insertion/extraction
Solution Approach 1:
The patent applies composite materials by combining carbon nanotubes with titanium dioxide nanoparticles to form a core-shell structure. The carbon nanotube core provides structural framework and electrical conductivity, while the titanium dioxide shell enhances lithium storage capacity. This composite structure resolves the contradiction by achieving high energy density through the synergistic effects of both materials without requiring complex external components.
Solution Approach 2:
The patent implements the nesting principle by forming titanium dioxide nanoparticles within and on the surface of carbon nanotubes, creating a core-shell structure where the titanium dioxide is nested within the carbon nanotube framework. This nested arrangement maximizes the utilization of both materials' properties while maintaining a relatively simple overall anode structure, thereby increasing energy density without proportionally increasing structural complexity.
2Power
If conventional carbon nanotube anodes are used, then the manufacturing process is simple, but the anode exhibits large lattice change and small operating voltage during lithium insertion/extraction
Solution Approach 1:
The composite structure of carbon nanotubes coated with titanium dioxide nanoparticles enhances the operating voltage by leveraging the electrochemical properties of titanium dioxide, which provides higher voltage platforms for lithium insertion/extraction compared to pure carbon nanotubes. The composite material maintains structural simplicity while achieving improved power characteristics.
3Reliability
If conventional carbon nanotube anodes are used, then the structure is simple, but the anode cannot avoid electrode collapse and suppress solid electrolyte interface layer formation
Solution Approach 1:
The composite structure combines the mechanical strength and flexibility of carbon nanotubes with the protective properties of titanium dioxide nanoparticles. The titanium dioxide shell prevents direct contact between the carbon nanotube surface and the electrolyte, thereby suppressing excessive solid electrolyte interface layer formation and preventing electrode collapse during cycling. This resolves the contradiction by enhancing reliability through material composition rather than structural complexity.
Solution Approach 2:
The titanium dioxide nanoparticles act as a protective cushioning layer on the carbon nanotube surface, preventing direct mechanical stress and chemical degradation during lithium insertion/extraction cycles. This beforehand protection prevents electrode collapse and stabilizes the solid electrolyte interface, thereby improving reliability without requiring complex structural designs.
4Reliability
If conventional carbon nanotube anodes are used, then no additional materials are needed, but lithium dendrites will appear and capacity retention is poor
Solution Approach 1:
The composite structure of carbon nanotubes with titanium dioxide nanoparticles improves capacity retention by leveraging the high lithium storage capacity of titanium dioxide and the excellent conductivity of carbon nanotubes. The titanium dioxide shell promotes uniform lithium distribution, preventing dendrite formation and maintaining stable capacity over multiple cycles. This achieves improved reliability through material composition rather than adding complex external components.
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 anode achieves high discharge capacities and capacity retention at high charge/discharge rates, with reduced battery attenuation and the ability to maintain structure after repeated cycling, while eliminating the need for binders and current collectors, resulting in a more environmentally friendly and lightweight battery design.
Implementation Method 1
a plurality of titanium dioxide nanoparticles are uniformly adsorbed on the surfaces of the plurality of carbon nanotubes
Implementation Method 2
The carbon nanotube film 10 is a flexible and free-standing carbon nanotube film
Implementation Method 3
The lithium-ion battery anode 100 achieves high discharge capacities and capacity retention at high charge/discharge rates
Data Source
AI summary
The present disclosure relates to a lithium-ion battery anode comprising a flexible and free-standing carbon nanotube film, and a plurality of titanium dioxide nanoparticles uniformly adsorbed on a surface of each of the plurality of carbon nanotubes. The flexible and free-standing carbon nanotube film comprises a plurality of carbon nanotubes. A particle size of each of the plurality of titanium dioxide nanoparticles is less than or equal to 30 nanometers. The present disclosure also relates to a lithium-ion battery comprising the lithium-ion battery anode.