Compacting Submicronic Silicon Particles for Battery Matrices
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Solution Overview
Problem
Existing methods for producing silicon-containing particles for batteries and photovoltaic cells face challenges in achieving safe, easy handling, and high-quality results while maintaining the nanometric properties of silicon particles, which are often compromised by sintering at high temperatures or loss of specific surface area during compaction.
Innovation Solution
A production method involving the compaction of submicronic silicon particles to a bulk density greater than 0.10 g/cm³ without forming covalent bonds, maintaining at least 70% of their original specific surface area, and incorporating them into a carbon-based matrix without additives, ensuring they are not subjected to temperatures above 400°C, allowing for the preservation of their nanometric properties and ease of handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If submicronic silicon particles are compacted to increase bulk density for safe handling, then ease of operation is improved, but specific surface area is reduced compromising nanometric properties
Solution Approach 1:
The patent applies parameter changes by precisely controlling the bulk density parameter to be greater than 0.10 g/cm³ and maintaining specific surface area at least 70% of the original value. This optimized parameter range resolves the contradiction by finding the optimal balance point where particles are compacted enough for safe handling but not so much that nanometric properties are lost.
2Volume of stationary object
If high temperatures are applied during compacting to improve particle density, then bulk density is improved, but particle properties deteriorate due to sintering
Solution Approach 1:
The patent changes the temperature parameter by imposing a strict constraint that particles are not subjected to temperatures above 400°C during compacting. This parameter control prevents sintering and maintains particle properties while still achieving the required bulk density through alternative compacting mechanisms.
3Strength
If covalent bonds form between particles during compacting to improve structural stability, then strength is improved, but nanometric properties are lost
Solution Approach 1:
The patent applies parameter changes by controlling the compacting conditions to prevent covalent bond formation between particles. By adjusting pressure, temperature, and compaction methodology parameters, the process achieves sufficient structural stability for handling while maintaining particle independence and nanometric characteristics.
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
This method enables the production of high-quality batteries and photovoltaic panels with improved storage capacity and performance, maintaining the nanometric properties of silicon particles while ensuring safety and ease of handling, with enhanced flow and powderiness characteristics compared to traditional methods.
Implementation Method 1
the particles are in a compacted state with a bulk density of more than 0.10 grams per cubic centimeter
Implementation Method 2
a specific surface area determined by the Brunauer, Emmett and Teller method... by adsorption of dinitrogen on the surface of a known mass of the particles
Data Source
AI summary
A production method is provided in which submicronic particles containing silicon are incorporated into a matrix, wherein, during the incorporation of the particles, the particles are in a compacted state with a bulk density of more than 0.10 grams per cubic centimeter, and the compacted particles have a specific surface area at least 70% of that of the particles considered separately without contact between each other.