Nano-structured Anode Matrix for Lithium-Ion Batteries
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Solution Overview
Problem
Current lithium-ion battery anode materials, such as graphite, face limitations in capacity, cycle life, and mechanical stability due to large volume changes during charge/discharge, leading to potential mechanical failure and reduced cyclability, particularly with materials like silicon which exhibit rapid capacity decay and decrepitation.
Innovation Solution
A nano-scale anode composition comprising a nano-structured support matrix, such as carbon nanotubes, combined with metallic, metalloid, or non-metallic nano-particles, where interfacial bonding is formed between the support matrix and the nano-particles, providing mechanical strength and facilitating lithium ion and electron transport, thereby addressing the challenges of volume change and capacity decay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If silicon or tin-based materials are used as anode materials to achieve high capacity, then the energy density is improved, but large volume changes occur during charge/discharge leading to mechanical failure and reduced cyclability
Solution Approach 1:
The anode material is segmented into nanoscale particles (1-100 nm diameter) embedded within a porous support matrix. This segmentation allows each particle to undergo volume changes independently without causing macroscopic mechanical failure, while the porous matrix provides structural support and maintains electrode integrity during cycling.
Solution Approach 2:
The porous support matrix acts as a flexible structural framework that can accommodate the volume expansion and contraction of the active material particles during lithiation and delithiation. The matrix structure remains stable while allowing the embedded particles to change volume, preventing electrode disintegration and maintaining electrical contact.
2Ease of manufacture
If conventional slurry mixing and casting methods are used to fabricate electrode films, then the manufacturing process is simplified, but the addition of polymer binder and carbon black reduces diffusion distances and increases ionic impedance and electronic resistance
Solution Approach 1:
The invention extracts and eliminates the polymer binder component from the conventional electrode structure. The porous support matrix itself serves as the structural framework that would traditionally require binder material, thereby removing the source of slow kinetics and high ionic impedance while maintaining electrode integrity.
Solution Approach 2:
The electrode is constructed as a composite material system consisting of active material particles embedded in a porous support matrix, eliminating the need for separate binder and conductive additive components. This composite structure provides both mechanical support and electrical conductivity through the matrix itself, reducing interfacial resistance and improving ion transport.
3Reliability
If 1D nano-structure anode materials are prepared using vapor phase deposition methods, then good cycling performance is achieved, but the high cost and low yield make the process commercially infeasible
Solution Approach 1:
The invention employs a cost-effective chemical vapor deposition approach using readily available precursors and catalysts to produce the nanostructured electrode material. The process uses inexpensive starting materials and operates under conditions that enable high yield production, making the method commercially viable while maintaining the performance benefits of nanostructured materials.
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 hybrid nanostructure achieves stable reversible capacity exceeding 1000 mAh/g with improved cycling performance and reduced mechanical stress, maintaining high capacity and efficiency over multiple cycles without the need for additional binders or carbon black, enhancing the overall performance of lithium-ion batteries.
Implementation Method 1
providing mechanical strength and facilitating lithium ion and electron transport
Implementation Method 2
facilitating lithium ion and electron transport
Implementation Method 3
facilitating lithium ion and electron transport
Data Source
AI summary
The present invention relates to compositions including nano-particles and a nano-structured support matrix, methods of their preparation and applications thereof. The compositions of the present invention are particularly suitable for use as anode material for lithium-ion rechargeable batteries. The nano-structured support matrix can include nanotubes, nanowires, nanorods, and mixtures thereof. The composition can further include a substrate on which the nano-structured support matrix is formed. The substrate can include a current collector material.