Crucible Assembly Grooves for Single-Particle Cathode Sintering
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Solution Overview
Problem
Existing Ni-based cathode active materials in the form of secondary particles suffer from micro-cracks during charge/discharge, leading to battery performance deterioration and electrolyte depletion, and single-crystal Ni-based materials face structural and thermal instability due to unstable Ni ions, hindering high energy density and lifespan.
Innovation Solution
A crucible assembly with a first crucible and a second crucible having incision grooves on the sidewalls, optimized to allow sufficient heat penetration and minimize fine particle formation, is used to synthesize single-particle cathode active materials, utilizing a compound like xAl2O3·yMgO·zSiO2 to stabilize the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If Ni-based cathode active materials are synthesized by coprecipitation method to reduce cost and increase capacity, then manufacturing cost decreases and reversible capacity increases, but micro-cracks are generated inside secondary particles during charge/discharge, causing battery performance deterioration
Solution Approach 1:
The invention divides the cathode active material into single crystal particles instead of secondary particles composed of multiple primary particles. This segmentation at the crystal level eliminates internal micro-cracks while maintaining high reversible capacity through increased surface area and improved ion transport pathways.
Solution Approach 2:
The invention uses composite materials by incorporating aluminum oxide (Al2O3) as a coating layer on the single crystal cathode active material surface. This composite structure provides mechanical strength to prevent particle collapse during charging, while the Al2O3 layer acts as a protective barrier against electrolyte decomposition and micro-crack formation.
2Quantity of substance
If electrode density is increased to achieve high energy density, then energy density increases, but secondary particles collapse, causing electrolyte depletion and sharp drop in initial lifespan
Solution Approach 1:
The invention uses single crystal particles instead of secondary particles, providing a monolithic structure that maintains integrity under high electrode density conditions. This eliminates particle collapse and prevents electrolyte depletion, thereby extending initial lifespan while achieving high energy density.
Solution Approach 2:
The Al2O3 coating layer forms a composite structure that provides mechanical support and prevents particle collapse during charging at high electrode densities. This protective layer maintains structural stability and prevents electrolyte decomposition, enabling high energy density without sacrificing initial lifespan.
3Stability of the object's composition
If single-crystal Ni-based cathode active material is used to prevent particle collapse, then particle stability improves, but structural and thermal instability occurs due to unstable Ni3+ and Ni4+ ions, deteriorating battery stability
Solution Approach 1:
The invention forms a composite structure with Al2O3 coating on the single crystal cathode active material surface. The Al2O3 layer provides structural stability and acts as a thermal barrier, preventing structural and thermal instability caused by unstable Ni3+ and Ni4+ ions while maintaining particle stability.
Solution Approach 2:
The Al2O3 coating creates an inert environment around the unstable Ni ions, isolating them from direct contact with electrolyte and preventing harmful side reactions. This protective barrier stabilizes the cathode material structurally and thermally while maintaining high particle stability.
4Manufacturing precision
If incision grooves are added to crucible sidewalls to improve heat penetration and reduce fine particles, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The crucible structure is segmented by adding incision grooves to the sidewalls, dividing the wall into sections that facilitate heat penetration. This segmentation improves manufacturing precision by enabling better temperature control during sintering, resulting in reduced fine particle formation while maintaining manageable structural complexity.
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 crucible assembly enables the production of single-particle cathode active materials with reduced fine particles, enhancing energy density and lifespan by preventing particle breakage and stabilizing the Ni ions, allowing for high electrode densities and improved electrochemical performance.
Implementation Method 1
incision grooves with an open area at an upper portion of each sidewall... sufficient heat penetration
Data Source
AI summary
The present disclosure provides a crucible assembly for producing a cathode active material. The crucible assembly includes a first crucible having an open top and an internal space and a second crucible disposed below the first crucible and having an incision groove with an open area at an upper portion of each sidewall.