Positive Electrode Material for Catalytic Lithium Supplementation
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Solution Overview
Problem
The low initial Coulombic efficiency of silicon-based negative electrodes in lithium-ion batteries is exacerbated by the continuous destruction-reconstruction of the solid electrolyte interphase membrane, leading to increased interfacial resistance and capacity decay, necessitating a safe, low-cost, and simple method for lithium supplementation.
Innovation Solution
A high-performance positive electrode material comprising porous materials, lithium-containing compounds, and doped metal element nanoparticles that catalyze the decomposition of lithium-containing compounds during charging and discharging, releasing lithium ions and expelling gases, thereby enhancing energy density and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lithium supplementation methods (metallic lithium powder, electrochemical pre-lithiation) are used, then initial Coulombic efficiency is improved, but production environment requirements become excessively stringent and costs increase
Solution Approach 1:
The patent replaces expensive metallic lithium powder with inexpensive lithium carbonate as the lithium source. The lithium carbonate serves as a sacrificial material that decomposes during battery formation to release lithium ions, eliminating the need for costly pre-lithiation processes while maintaining initial Coulombic efficiency
Solution Approach 2:
The patent changes the chemical form of lithium from metallic lithium (requiring strict anaerobic conditions) to lithium carbonate (stable in air). This parameter change in lithium's chemical state allows supplementation to proceed under normal production conditions without requiring oxygen-free, moisture-free environments
2Reliability
If lithium-containing compounds are used for supplementation, then safety is improved by avoiding metallic lithium, but decomposition completeness is insufficient without catalysis
Solution Approach 1:
The patent introduces metal element nanoparticles (Al, Ti, Mn, Co, Ni, Cu, Zn, Zr, Mo, Ge, or Sn) as catalytic intermediaries. These nanoparticles accelerate the decomposition of lithium-containing compounds during battery formation, ensuring complete lithium ion release while maintaining the safety advantages of using non-metallic lithium sources
3Productivity
If doped metal elements are added to catalyze decomposition, then lithium ion release is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by doping metal elements at specific locations within the positive electrode material structure. The metal nanoparticles are incorporated into the positive electrode active material matrix, creating localized catalytic sites that enhance lithium ion release without requiring system-wide structural changes
Solution Approach 2:
The patent creates a composite material system combining positive electrode active material with doped metal element nanoparticles. This composite structure integrates the catalytic function of metals with the electrochemical function of the positive electrode material, achieving enhanced lithium ion release through material-level integration rather than separate components
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 process improves battery capacity and cycle life by completely releasing lithium ions and addressing gas generation issues, while being cost-effective and environmentally friendly.
Implementation Method 1
doped metal element nanoparticles that catalyze the decomposition of lithium-containing compounds during charging and discharging, releasing lithium ions
Implementation Method 2
doped metal elements and porous materials can accelerate the internal conduction rate of lithium ions
Implementation Method 3
reactive active sites on a surface of the metal element nanoparticles adsorb the inert lithium-containing compounds, causing deformation or breaking of chemical bonds
Data Source
Figure 1~2
AI summary
The present invention relates to a high-performance positive electrode material, and a preparation method therefor and the use tthereof. The positive electrode material comprises: porous materials, lithium-containing compounds, metal nanoparticles, and positive electrode active materials; wherein the lithium-containing compounds comprise inorganic lithium source materials and/or organic lithium source materials; and the metal nanoparticles comprise one or more of : Al, Ti, Mn, Co, Ni, Cu, Zn, Zr, Mo, Ge, and Sn.