Functionalized Group IVA Particles for Lithium Ion Battery Anodes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium ion batteries face challenges with mechanical breakdown of silicon-based anodes due to volumetric expansion during charge/recharge cycles, and existing methods for producing Group IVA nanoparticles are costly and limited in scalability, requiring high-energy processes and dielectric passivation.
Innovation Solution
Development of functionalized Group IVA particles with a non-dielectric covalently bonded layer, such as hydrocarbons, which are stable to oxidation and can be efficiently produced in submicron sizes, allowing them to be incorporated into porous covalent frameworks for use in lithium ion batteries, reducing internal resistance and enhancing charge mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based anodes are used to increase charge capacity, then the charge capacity is improved, but mechanical breakdown occurs due to volumetric expansion during charge/recharge cycles
Solution Approach 1:
The silicon anode is divided into nanoscale particles (5-50 nm) embedded within a porous framework structure. This segmentation allows each particle to undergo volumetric expansion independently without causing mechanical failure to the overall structure, resolving the contradiction between high charge capacity and structural stability.
Solution Approach 2:
A porous framework structure acts as a flexible container that accommodates the volumetric expansion of silicon particles during lithium insertion. The framework's porous nature and structural flexibility prevent mechanical breakdown while maintaining structural integrity over multiple charge/recharge cycles.
2Reliability
If conventional dielectric passivation is used to protect Group IVA particles, then oxidation protection is achieved, but charge mobility is reduced due to dielectric properties
Solution Approach 1:
The passivation layer material is changed from conventional dielectric materials to non-dielectric materials such as hydrocarbons. This parameter change maintains oxidation protection while eliminating the dielectric barrier that impedes charge mobility, thereby reducing internal resistance and improving electrical performance.
3Manufacturing precision
If high-energy production processes are used to manufacture Group IVA nanoparticles, then particle quality is improved, but production cost and energy consumption increase
Solution Approach 1:
The synthesis process utilizes self-assembly mechanisms where Group IVA atoms automatically organize into nanoscale particles within the porous framework under mild conditions. This self-service approach eliminates the need for high-energy external processing while achieving precise particle size control through the framework's inherent structural constraints.
Solution Approach 2:
The porous framework provides a template that guides nanoparticle formation and limits particle growth to specific size ranges (5-50 nm). This template effect enables precise particle size control during synthesis under low-energy conditions, avoiding the need for high-energy post-processing techniques.
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 functionalized Group IVA particles provide a stable and high-capacity anode solution for lithium ion batteries, reducing mechanical breakdown and enabling efficient charge mobility, while also being economically produced without the need for high-energy processes.
Implementation Method 1
Group IVA particles passivated by a covalently bonded non-dielectric layer of hydrocarbons
Implementation Method 2
which are stable to oxidation
Implementation Method 3
Lithium ions migrating into the anode are met by electrons moving toward the anode through the closed circuit
Implementation Method 4
possess good charge carrier mobility
Implementation Method 5
a fully charged battery delivers electrical power as it undergoes an oxidation/reduction process
Implementation Method 6
reducing lithium ions to Li0 at the anode
Implementation Method 7
electrons are allowed to flow between the negative and positive polls of the battery
Data Source
AI summary
Disclosed herein are functionalized Group IVA particles, methods of preparing the Group IVA particles, and methods of using the Group IVA particles. The Group IVA particles may be passivated with at least one layer of material covering at least a portion of the particle. The layer of material may be a covalently bonded non-dielectric layer of material. The Group IVA particles may be used in various technologies, including lithium ion batteries and photovoltaic cells.