Oriented Cathode Design for High-Performance Lithium Batteries
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Summary
Problems
Conventional cathode active materials for lithium batteries face challenges in achieving a complete orientation from the inside to the surface of particles, leading to high processing costs and difficulty in quality control, while also being limited by high cobalt content and recent price increases, which affect rate characteristics and lifespan.
Innovation solutions
A cathode active material with an oriented structure is prepared by firing a density gradient precursor, where the density gradually changes from the inside to the outside of secondary particles formed from aggregated primary particles, using xylitol as a particle shape controller to enhance capacity and lifespan characteristics.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If a concentration gradient structure is implemented in cathode active materials, then stability is improved, but manufacturing complexity increases and quality control becomes difficult
Why choose this principle:
The patent applies parameter changes by controlling the concentration of transition metal components (Ni, Co, Mn) as a gradient from the particle center to surface, and by controlling particle density as a gradient. This creates the oriented structure that improves stability while using a relatively simple firing process to achieve the concentration gradient, thus resolving the contradiction between reliability improvement and manufacturing complexity.
Principle concept:
If cobalt content is increased to improve rate characteristics, then performance is improved, but cost increases
Why choose this principle:
The patent applies local quality by creating different chemical compositions at different locations within the particle. The center region has a different transition metal component concentration compared to the surface region, allowing optimized rate characteristics in the interior while controlling overall cobalt content to reduce cost. This enables performance optimization without uniformly increasing expensive cobalt throughout the entire material.
Application Domain
Data Source
AI summary:
A cathode active material with an oriented structure is prepared by firing a density gradient precursor, where the density gradually changes from the inside to the outside of secondary particles formed from aggregated primary particles, using xylitol as a particle shape controller to enhance capacity and lifespan characteristics.
Abstract
The present invention relates to a lithium battery cathode active material and a preparation method therefor, the material having an orientation formed by firing a density gradient precursor in which the density gradually changes from the inside of second particles, formed as an aggregate of primary particles, to the outside of the particles. The lithium battery cathode active material according to the present invention has an oriented structure, and thus can have a long lifespan and high capacity characteristics.