Porous Shell Cathode Particles for Fast Ion Release
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Solution Overview
Problem
Rechargeable lithium-ion batteries face challenges in achieving low cost and long life, particularly in large-scale applications such as electric vehicles and renewable energy storage, where the performance of cathode materials is limited by their surface area and lithium ion release tendencies.
Innovation Solution
The development of a cathode material with a porous shell structure created by acid leaching and heat treatment of lithium compound particles, such as NMC, increases the surface area for faster ion insertion and de-insertion while maintaining high energy density and capacity, using a method that includes soaking the particles in a dilute acid solution followed by heat treatment to form a stable porous shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cathode material uses traditional dense particle structure, then the manufacturing process is simple, but the surface area is limited and lithium ion release is slow
Solution Approach 1:
The patent applies porous materials by creating a porous shell structure on the cathode particle surface through acid leaching treatment. This porous structure increases the surface area available for lithium ion insertion and extraction, thereby improving the lithium ion release rate and battery power density without fundamentally changing the core particle structure.
Solution Approach 2:
The patent applies local quality by creating a porous shell only on the surface of the cathode particles while maintaining a dense core. This localized modification optimizes the surface area for ion transport where it is most needed, while preserving the bulk material's structural integrity and electrochemical properties.
2Power
If the cathode material surface area is increased through porous structure, then the power density improves, but the manufacturing process becomes more complex
Solution Approach 1:
The patent applies parameter changes by modifying the surface morphology of cathode particles through acid leaching treatment. This chemical treatment process transforms the dense surface into a porous structure with increased surface area, thereby enhancing power density. The process parameters (acid concentration, treatment time, temperature) can be optimized to achieve desired porosity levels.
3Productivity
If acid leaching treatment is applied to create porous shell, then the surface area increases for faster ion insertion, but the manufacturing time and process steps increase
Solution Approach 1:
The patent applies preliminary action by performing acid leaching treatment during the cathode material manufacturing process, before battery assembly. This preliminary modification of the particle structure ensures that the porous shell is formed in advance, allowing subsequent battery assembly and operation to benefit from the enhanced ion transport capabilities without adding time to the overall manufacturing cycle.
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 approach enhances battery power density without sacrificing energy density, making the process inexpensive and scalable, and applicable to various lithium-ion battery types, including automotive and renewable energy applications.
Implementation Method 1
exposing the cathode material in the form of particles to an acid solution for a time period sufficient to form a plurality of pores in a surface of the particles
Implementation Method 2
Subsequent to the acid exposure, the particles are heat treated
Data Source
AI summary
A cathode material formed of a plurality of lithium inclusive particles. The particles have a core surrounded by a shell. The shell is characterized by a plurality of pores. Exemplary materials of which the particles are formed include NMC. The cathode material is suitable for use in a lithium-ion battery which has application in apparatus such as automotive vehicles.