Porous Silicon Oxide Electrode for Uniform Lithium Metal Deposition
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Solution Overview
Problem
Lithium metal batteries face issues with uneven lithium deposition leading to lithium dendrites, which can cause short circuits, overheating, and reduced stability due to high reaction potentials and low capacity of anode materials like graphite and silicon.
Innovation Solution
An electrode for lithium metal batteries incorporating silicon oxide particles with a molar ratio of oxygen to silicon between 1.5 and 2.0 and a porous structure, allowing for uniform lithium deposition and suppressing dendrite growth through controlled porosity and current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If lithium metal is used as an anode material to improve energy density, then capacity is improved, but lithium dendrites form causing safety issues and reduced stability
Solution Approach 1:
The patent employs a porous coating layer formed on the lithium metal anode surface through electrochemical oxidation of silicon particles. This porous structure provides a three-dimensional framework that guides uniform lithium ion deposition, preventing dendrite formation while maintaining high capacity. The porous morphology increases surface area and facilitates even current distribution throughout the anode.
Solution Approach 2:
The patent creates a composite structure combining silicon particles, their oxidation products (SiOx), and lithium metal. This composite anode system leverages the high capacity of lithium metal while the silicon-based coating provides structural stability and dendrite suppression. The composite nature allows simultaneous achievement of high capacity and improved stability.
2Use of energy by moving object
If lithium metal is used as an anode material, then energy density is improved, but uneven lithium deposition occurs leading to dendrite growth
Solution Approach 1:
The porous coating layer created from silicon oxidation provides a controlled three-dimensional framework that guides uniform lithium ion deposition. The interconnected pore structure ensures even current distribution and prevents localized concentration of lithium ions, thereby eliminating uneven deposition and dendrite formation while preserving high energy density.
Solution Approach 2:
The silicon particles are pre-oxidized to form the porous coating structure before lithium metal deposition occurs. This preliminary formation of the porous framework establishes predetermined pathways for lithium ion transport, ensuring uniform deposition from the first cycle and preventing subsequent dendrite growth.
3Reliability
If graphite or silicon is used as anode material, then safety is improved, but reaction potential is high and capacity is low
Solution Approach 1:
The patent creates a composite anode system combining lithium metal (providing high capacity) with silicon-based oxidation products (providing safety and structural stability). This composite structure allows the system to achieve the high capacity of lithium metal while maintaining the safety characteristics of silicon-based materials, effectively resolving the trade-off between capacity and safety.
Solution Approach 2:
The patent changes the oxidation state of silicon particles to form SiOx coating layers with specific properties. By controlling the oxidation process and creating specific phases (such as SiO2 or lithium silicates), the material parameters are optimized to provide both high capacity retention and enhanced safety, transitioning from pure lithium metal to a stabilized composite structure.
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 electrode improves capacity and stability by ensuring uniform lithium deposition, reducing volume changes, and enhancing electrical characteristics, thereby increasing the cycle life and energy density of the battery.
Implementation Method 1
silicon oxide particles having a porous structure
Implementation Method 2
the binder and the conductive material may be omitted from the lithium metal storage layer
Implementation Method 3
lithium metal may be deposited and dealloyed within the silicon oxide particles
Data Source
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AI summary
An electrode for a lithium metal battery according to embodiments of the present disclosure includes a lithium metal storage layer including silicon oxide particles. The silicon oxide particles have a porous structure, and the molar ratio of oxygen to silicon in the silicon oxide particles is 1.5 or more and less than 2.0. A lithium metal battery according to embodiments of the present disclosure includes the electrode for a lithium metal battery according to the above-described embodiments.