Lithium Ferrous Phosphate Cathode Coated with Metal Oxide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Lithium ferrous phosphate-based cathode materials have low conductivity and lithium ion diffusion rates, limiting their use in high current density applications, and existing methods to improve conductivity are either costly or environmentally harmful.
Innovation Solution
A cathode material comprising an electrochemical compound with an olivine or NASICON structure and a conductive metal oxide, where the metal oxide is attached to the electrochemical compound particles, enhancing conductivity and lithium ion diffusion, and can be produced using a process that adjusts pH and temperature to minimize environmental impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lithium ferrous phosphate is used as cathode material, then environmental benignity and stability are improved, but conductivity and lithium ion diffusion rate deteriorate
Solution Approach 1:
The patent creates a composite material by coating lithium ferrous phosphate particles with conductive metal oxide (such as indium oxide, tin oxide, or zinc oxide). This composite structure combines the stability and environmental benefits of lithium ferrous phosphate with the high conductivity of metal oxide, resolving the contradiction between stability and conductivity.
2Object-generated harmful factors
If conductive metal particles are added to improve conductivity, then conductivity is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent uses metal oxide as an intermediary coating material that provides conductivity without the high reactivity and manufacturing complexity associated with metallic particles. The metal oxide layer acts as a mediator between the lithium ferrous phosphate core and the electrolyte, enabling electron transport while simplifying the manufacturing process through conventional coating techniques.
3Object-generated harmful factors
If organic material is added to reactant mixture, then conductive carbonaceous materials are produced, but environmental pollution increases
Solution Approach 1:
Instead of using organic materials that produce harmful pyrolysis products, the patent converts the beneficial properties of inorganic metal oxides (conductivity, thermal stability) into a coating that enhances battery performance without environmental harm. This approach transforms a potentially harmful process into a benign one by substituting organic precursors with inorganic oxide coatings.
4Object-generated harmful factors
If high temperature and pressure are used to mix conductive material, then conductivity is improved, but energy consumption and manufacturing cost increase
Solution Approach 1:
The patent changes the processing parameters from high temperature and pressure mechanical mixing to low temperature chemical vapor deposition or solution-based coating. This parameter change achieves effective conductive coating at significantly lower energy consumption, maintaining conductivity improvement while reducing manufacturing costs and energy use.
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 cathode material exhibits improved conductivity and lithium ion diffusion, leading to increased specific capacity and electrochemical reversibility, making it suitable for high current output and multiple series-parallel battery applications, while being manufactured in an economically and environmentally friendly manner.
Implementation Method 1
a conductive metal oxide... enhancing conductivity
Implementation Method 2
lithium ion diffusion rate... enhanced
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A cathode material for manufacturing a rechargeable battery includes an electrochemical compound having one of olivine and NASICON structures, and a conductive metal oxide. A rechargeable battery including an anode, an electrolyte, and a cathode made from the above cathode material that has an electrochemical compound having olivine or NASICON structure and a conductive metal oxide is also disclosed.