Porous Lithium Metal Oxide Cathode for High Power Density
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Solution Overview
Problem
Lithium alloy oxide cathodal materials in lithium cells have low conductivity and insufficient potential during high current discharging, limiting their charge/discharge ability and lifespan, making them unsuitable for higher powered applications.
Innovation Solution
A porous lithium metal oxide microparticle cathodal material is developed, comprising a plurality of nanoparticles with a first conductive layer, a second conductive layer forming a three-dimensional network, and conductive fibers, fabricated using a method involving mixed powders of lithium, phosphate, and iron ion precursors, along with conductive carbon and a binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If lithium alloy oxide cathodal material is used in lithium cells, then the cell can provide high power density for 3C products, but the material has low conductivity and insufficient potential during high current discharging, degrading charge/discharge ability and product lifespan
Solution Approach 1:
The patent employs porous lithium metal oxide microparticles with a porous internal structure. The porosity increases the surface area and provides pathways for ion transport, improving conductivity and charge/discharge performance while maintaining high power density capability.
Solution Approach 2:
The patent creates a composite structure by coating lithium metal oxide nanoparticles with conductive materials (such as carbon or metal oxides). This composite approach enhances the electrical conductivity of the cathodal material, enabling high current discharge performance and extending cell lifespan.
2Ease of manufacture
If conventional lithium alloy oxide cathodal material is used, then the structure is simple and manufacturing is easy, but the conductivity is low and potential is insufficient during high current operations
Solution Approach 1:
The patent applies conductive coatings to the lithium metal oxide nanoparticles before assembling the cathode structure. This preliminary action of pre-coating ensures that the material has sufficient conductivity from the outset, enabling high current performance without complicating the overall manufacturing process.
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 enhances electron and ion conductivity, improving charge/discharge performance and extending the lifespan of lithium secondary cells, enabling their use in higher powered applications.
Implementation Method 1
a second conductive layer covering at least a surface of one of the lithium metal oxide nanoparticles contacting the first conductive layer and forming a three-dimensional conductive network between the lithium metal oxide nanoparticles
Implementation Method 2
a pore defined by connecting the lithium metal oxide nanoparticles
Data Source
AI summary
A cathodal material for lithium cells comprises a porous lithium oxide microparticle is provided. The porous lithium oxide microparticle comprises a plurality of porous lithium oxide nanoparticles formed with a first conductive layer therein, a pore defined by connecting the lithium oxide nanoparticles, a second conductive layer covering at least a surface of one of the lithium oxide nanoparticles contacting the first conductive layer and forming a three-dimensional conductive network between the lithium oxide nanoparticles, and a conductive fiber connecting with the second conductive layer.