Anchored Nanocomposite Anodes for High-Capacity Cycle Stability
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Solution Overview
Problem
Existing anode materials for lithium ion batteries, such as graphite, face challenges with volume expansion during lithiation, leading to pulverization and reduced cyclability, while high-capacity alternatives like Si and Sn suffer from high synthesis costs and scalability issues.
Innovation Solution
The development of nanocomposites comprising a base material and a plurality of nanoparticles, where the nanoparticles are intimately associated with the base material, maintaining its morphology while enhancing its properties, such as cyclic stability and capacity, through heterogeneous nucleation and anchoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high-capacity anode materials such as Si, Sn, and metal oxides are used, then capacity is improved, but volume expansion during lithiation causes pulverization and reduced cyclability
Solution Approach 1:
The anode material is divided into nanoscale particles (1-100 nm) embedded within the graphite structure. This segmentation reduces the volume expansion stress on individual particles during lithiation, preventing pulverization while maintaining high capacity. The nanoscale division allows the material to accommodate volume changes without structural collapse.
Solution Approach 2:
Nanoparticles of high-capacity materials (Si, Sn, or metal oxides) are nested within the graphite anode structure. The graphite matrix serves as a protective container that constrains the nanoparticles during volume expansion, preventing electrode pulverization while allowing the nanoparticles to deliver their high capacity.
2Quantity of substance
If high-capacity anode materials such as Si, Sn, and metal oxides are used, then capacity is improved, but synthesis cost and scalability are worsened
Solution Approach 1:
The invention merges the advantages of high-capacity materials with the proven performance of graphite in a single composite structure. By combining nanoparticles of Si, Sn, or metal oxides with graphite in one synthesis process, the method achieves high capacity while maintaining the ease of manufacture and scalability associated with graphite-based anodes.
Solution Approach 2:
The invention changes the scale parameter of the high-capacity materials from macroscopic to nanoscale (1-100 nm). This parameter change enables the materials to be integrated into conventional graphite anode manufacturing processes, improving ease of manufacture and scalability while retaining the high capacity benefits.
3Reliability
If graphite is used as anode material, then cyclic performance and stability are improved, but capacity is limited compared to other materials
Solution Approach 1:
The invention creates a composite anode material consisting of graphite as the matrix with dispersed nanoparticles of high-capacity materials (Si, Sn, or metal oxides). This composite structure combines the excellent cyclic performance and stability of graphite with the high capacity of the nanoparticle materials, achieving both properties simultaneously.
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 nanocomposites exhibit improved cyclic stability and higher capacities compared to unmodified graphite, with the ability to maintain these properties after multiple charge-discharge cycles, addressing the limitations of current anode materials.
Implementation Method 1
combining a first input stream of flowing fluid comprising a base material having nucleation sites, a second input stream of flowing fluid comprising a nanoparticle precursor material, and a third input stream of flowing fluid comprising a nanoparticle nucleation agent, to form an output stream of flowing fluid; heating or sonicating or both heating and sonicating the output stream for a period of time; and collecting a nanocomposite formed within the fluid of the output stream, the nanocomposite comprising the base material and a plurality of nanoparticles directly anchored onto a surface of the base material via the nucleation sites
Implementation Method 2
heating or sonicating or both heating and sonicating the output stream for a period of time
Implementation Method 3
heating or sonicating or both heating and sonicating the output stream for a period of time
Data Source
AI summary
Methods of forming a nanocomposite of a base material and a plurality of nanoparticles are provided. In embodiments, the method comprises combining a first input stream of flowing fluid comprising a base material having nucleation sites, a second input stream of flowing fluid comprising a nanoparticle precursor material, and a third input stream of flowing fluid comprising a nanoparticle nucleation agent, to form an output stream of flowing fluid; heating or sonicating or both heating and sonicating the output stream for a period of time; and collecting a nanocomposite formed within the fluid of the output stream, the nanocomposite comprising the base material and a plurality of nanoparticles directly anchored onto a surface of the base material via the nucleation sites. The nanocomposites are also provided.