Single-Crystal Multi-Element Cathode for High-Nickel Phase Stability
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Solution Overview
Problem
Existing lithium ion battery ternary cathode materials with high nickel content suffer from poor cycle life and safety due to lithium-nickel disordered arrangement and phase transitions, leading to issues with particle uniformity, agglomeration, and adhesion, which affect energy density and stability.
Innovation Solution
A single-crystal ternary cathode material is developed through a method involving multiple high-temperature sintering processes and doping, resulting in a material with uniform particle size, reduced agglomeration, and improved structural stability, enhancing energy density and cyclic stability when used in lithium ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high nickel content is used in ternary cathode materials to increase material capacity density, then the energy density is improved, but the cycle life and safety deteriorate due to lithium-nickel disordered arrangement and phase transitions
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the interior maintains high nickel content for capacity while the surface layer has modified composition and single-crystal structure for stability. This spatial differentiation of material properties resolves the contradiction between high energy density and cycle life.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (Ni, Co, Mn, Al, Ti, Zr) in a single-crystal ternary structure. This composite approach creates a material that simultaneously achieves high capacity from nickel and enhanced stability from the synergistic effects of other elements, resolving the energy density versus cycle life trade-off.
2Use of energy by moving object
If high nickel content is used in ternary cathode materials to increase material capacity density, then the energy density is improved, but the safety deteriorates due to lithium-nickel disordered arrangement and phase transitions
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the interior maintains high nickel content for capacity while the surface layer has modified composition and single-crystal structure for stability. This spatial differentiation of material properties resolves the contradiction between high energy density and cycle life.
Solution Approach 2:
The patent uses composite materials by combining multiple elements (Ni, Co, Mn, Al, Ti, Zr) in a single-crystal ternary structure. This composite approach creates a material that simultaneously achieves high capacity from nickel and enhanced stability from the synergistic effects of other elements, resolving the energy density versus cycle life trade-off.
3Ease of manufacture
If conventional sintering process is used for cathode material synthesis, then the manufacturing process is simple, but the particle size is non-uniform and agglomeration is severe leading to poor compaction density
Solution Approach 1:
The patent applies preliminary action by pre-forming spherical precursor particles with controlled size distribution before sintering. This pre-preparation ensures uniform particle growth during subsequent high-temperature treatment, achieving consistent particle size and reduced agglomeration while maintaining process simplicity.
Solution Approach 2:
The patent uses parameter changes by implementing a two-stage sintering process with specific temperature ranges and durations. The controlled thermal parameters enable complete reaction and single-crystal formation while preventing excessive particle growth and agglomeration, thus achieving uniform particle size distribution.
4Ease of manufacture
If conventional sintering process is used for cathode material synthesis, then the manufacturing process is simple, but the single-crystal roundness is poor and adhesion between particles is high
Solution Approach 1:
The patent applies preliminary action by pre-forming spherical precursor particles with controlled size distribution before sintering. This pre-preparation ensures uniform particle growth during subsequent high-temperature treatment, achieving consistent particle size and reduced agglomeration while maintaining process simplicity.
Solution Approach 2:
The patent uses parameter changes by implementing a two-stage sintering process with specific temperature ranges and durations. The controlled thermal parameters enable complete reaction and single-crystal formation while preventing excessive particle growth and agglomeration, thus achieving uniform particle size distribution.
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 single-crystal cathode material exhibits improved energy density, rate capability, cyclic stability, and safety by achieving a high compaction density and reduced adhesion, addressing the limitations of traditional materials.
Implementation Method 1
a synthesis process needs to be optimized, and by optimizing a sintering process and a doping and coating system, lattice defects can be reduced and the surface structure of the material can be stabilized
Data Source
AI summary
A single-crystal-type multi-element positive electrode material, and a preparation method therefor and an application thereof.