Silicon Negative Electrode Material for High-Load Battery Discharge
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Solution Overview
Problem
Conventional batteries have low discharge load capacity, which is inadequate for modern applications such as electronic devices and electric vehicles, necessitating an improvement in discharge load characteristics.
Innovation Solution
A negative electrode active material comprising silicon-based particles with a specific Si2p spectrum range and half-width, measured by X-ray photoelectron spectroscopy, is used to enhance charge transfer reactions and reduce charge transfer resistance, while also incorporating a carbon-based material to improve cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If silicon-based materials are used as negative electrode active material to achieve higher capacity than carbon-based materials, then battery capacity is improved, but discharge load characteristics deteriorate due to low discharge load capacity
Solution Approach 1:
The patent controls the Si2p spectrum peak position (99.0-105.0 eV) and half-width (1.5-8.0 eV) as key parameters to optimize the bonding state of silicon-based material. By adjusting these spectral parameters through surface treatment or composition control, the discharge load characteristics are improved while maintaining high capacity
Solution Approach 2:
The patent uses composite negative electrode active material containing silicon-based material with specific bonding characteristics. The composite structure allows combining high capacity of silicon with improved discharge performance through controlled bonding states (stable and metastable states indicated by Si2p spectrum)
2Ease of manufacture
If conventional electrode active material is used, then manufacturing simplicity is maintained, but discharge load capacity remains low
Solution Approach 1:
Rather than changing the basic material type, the patent optimizes existing silicon-based materials by controlling spectral parameters (Si2p peak position and half-width). This approach maintains manufacturing simplicity while achieving improved discharge load capacity through precise parameter control
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 solution significantly improves discharge load characteristics by facilitating stable and metastable bonding states, reducing irreversible reactions, and suppressing the formation of irreversible substances, thereby enhancing the battery's capacity and cycle performance.
Implementation Method 1
a Si2p spectrum obtained by measuring the first negative electrode active material particle in a state of 0.6 V (vs. Li/Li+) by X-ray photoelectron spectroscopy
Data Source
AI summary
A negative electrode active material includes a first negative electrode active material particle, and the first negative electrode active material includes a silicon-based material. A Si2p spectrum obtained by measuring the first negative electrode active material particle in a state of 0.6 V (vs. Li/Li+) by X-ray photoelectron spectroscopy has a peak in a range from 99.0 eV to 105.0 eV, and a half width of the peak is 1.5 eV or more and 8.0 eV or less.