Mono-Grain Cathode Composition for Dense Li-Ion Battery Packing
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Solution Overview
Problem
Lithium-ion batteries face challenges in achieving high volumetric energy density due to the limitations of existing cathode active materials, which lead to performance degradation and reduced cycle life.
Innovation Solution
The development of mono-grain cathode materials with specific chemical compositions and processing techniques, including high tap density of metal oxide precursors, high calcination temperature, and long calcination time, to enhance particle strength and packing density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conventional cathode active materials are used, then battery volume can be reduced, but volumetric energy density and cycle life deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the calcination temperature (900-1100°C) and time (10-20 hours) to transform the cathode material particles into a mono-grain structure. This thermal processing parameter optimization enables the formation of single-crystal particles with enhanced mechanical strength and electrochemical stability, resolving the contradiction between reducing battery volume and maintaining cycle life
Solution Approach 2:
The patent creates a composite cathode material with the formula Li1-a-b-c(Co1-x-y-zMnxNiyAly)1-aO2-b, combining multiple transition metals (Co, Mn, Ni, Al) in specific ratios. This composite material approach achieves both high volumetric energy density and improved cycle life by leveraging the complementary properties of different metals while maintaining a mono-grain particle structure
2Strength
If calcination temperature and time are increased to improve particle strength, then manufacturing complexity and energy consumption increase
Solution Approach 1:
The patent optimizes the calcination parameters within specific ranges (900-1100°C for 10-20 hours) to achieve the desired particle strength while minimizing energy consumption. By precisely controlling these thermal parameters, the process achieves mono-grain particle formation without excessive energy input, balancing particle strength enhancement with energy efficiency
Solution Approach 2:
The patent employs continuous calcination processing without intermediate interruptions or multiple heating-cooling cycles. The sustained thermal treatment (10-20 hours at elevated temperature) continuously transforms the precursor particles into mono-grain structures, maintaining useful action throughout the process and avoiding energy waste associated with repeated heating and cooling cycles
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 mono-grain cathode materials demonstrate improved cycle life and energy retention by maintaining particle integrity and reducing cracking during calendering, leading to enhanced electrochemical performance.
Implementation Method 1
calcinating a mixture of the metal oxide precursors and/or hydroxide precursors and lithium carbonate (Li2CO3) at a first elevated temperature for a first period of time to produce a first plurality of particles
Implementation Method 2
applying a Li2SiO3 coating and annealing the second plurality of milled particles at a second elevated temperature for a second period of time
Data Source
AI summary
Compounds, particles, and cathode active materials that can be used in lithium ion batteries are described herein. Methods of making such compounds, powders, and cathode active materials are described. The particles have a particle size distribution with a D50 ranging from 10 μm to 20 μm.