Plate-Shaped Nickel Composite Hydroxide for High Density Batteries
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Solution Overview
Problem
Existing non-aqueous electrolyte secondary batteries face challenges in achieving high electrode density, battery capacity, and output characteristics due to the limitations of spherical positive electrode active materials, which are prone to breaking in thin electrode films and result in decreased volume energy density.
Innovation Solution
The development of nickel composite hydroxide with plate-shaped secondary particles aggregated from primary particles, mixed with a lithium compound and calcined, to create a positive electrode active material with a hexagonal layered structure, allowing for high electrode density and output characteristics while maintaining battery capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If spherical positive electrode active material particles are used, then the electrode films can be made thin to improve power density, but the volume energy density decreases due to low electrode densities
Solution Approach 1:
The invention inverts the conventional spherical shape to plate-shaped particles with high aspect ratio. This shape transformation allows particles to orient parallel to the current collector, achieving high filling density in thin electrode films while maintaining structural integrity during lithium ion insertion/extraction cycles.
Solution Approach 2:
The invention transitions from zero-dimensional spherical particles to two-dimensional plate-shaped particles with specific orientation. This dimensional change enables the particles to align in a preferred direction, maximizing the electrode's volumetric capacity while maintaining thin film structure for high power density.
2Power
If small-size particles are used to prevent electrode film breaking, then the power density can be improved, but the volume energy density decreases
Solution Approach 1:
The invention uses plate-shaped particles with controlled dimensions (length 1-5 μm, thickness 0.1-1 μm) that provide both small size for stress distribution and high aspect ratio for orientation. This shape control allows thin electrode films to accommodate particle expansion without breaking while maintaining high volumetric filling.
3Quantity of substance
If plate-shaped particles with high aspect ratio are used, then the electrode density can be increased to improve volume energy density, but the manufacturing complexity increases
Solution Approach 1:
The invention controls particle morphology by adjusting synthesis parameters including pH value (10.5-12.5), temperature (20-80°C), and reaction time to achieve plate-shaped particles with aspect ratio 3-20. These parameter changes enable shape control without requiring complex post-processing or specialized equipment.
Solution Approach 2:
The invention uses composite hydroxide particles containing multiple metal elements (Ni, Co, Mn, Al) that form a structured composite during synthesis. This composite structure naturally develops the desired plate shape and provides both high electrode density and simplified manufacturing through single-step co-precipitation.
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 enables the formation of thin electrode films with high output characteristics and battery capacity, achieving a balance between electrode density and volume energy density, enhancing the performance of non-aqueous electrolyte secondary batteries.
Implementation Method 1
calcined, to create a positive electrode active material with a hexagonal layered structure
Data Source
AI summary
A positive electrode active material for a non-aqueous electrolyte secondary battery achieves high output characteristics and battery capacity, and allows a high electrode density to be achieved in the case of using the material for a positive electrode of a battery; and a non-aqueous electrolyte secondary battery uses the positive electrode active material, thereby achieving a high output with a high capacity. Prepared is a nickel composite hydroxide including plate-shaped secondary particles aggregated with overlaps between plate surfaces of multiple plate-shaped primary particles, where shapes projected from directions perpendicular to the plate surfaces of the plate-shaped primary particles are any plane projection shape of spherical, elliptical, oblong, and massive shapes, and the secondary particles have an aspect ratio of 3 to 20, and a volume average particle size (Mv) of 4 μm to 20 μm measured by a laser diffraction scattering method.