Porous Nickel Hydroxide Positive Electrode Material for Lower Resistivity
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Solution Overview
Problem
Nickel metal hydride secondary batteries face challenges in improving electrical conductivity of positive electrode active materials, leading to increased volume resistivity under high load conditions, which affects battery performance and utilization rate.
Innovation Solution
A positive electrode material with a nickel-containing hydroxide particle covered by a cobalt compound, where the pore distribution is optimized with a local maximum pore volume peak between 1.7 nm and 10.0 nm, and a cumulative average pore diameter between 45.0×10−10 m and 75.0×10−10 m, produced through a coprecipitation method with controlled pH and flow rates, enhancing electrical conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a covering layer with cobalt compound is formed on nickel hydroxide particle to increase cobalt content and improve uniformity and adhesiveness, then the covering layer uniformity and adhesiveness are improved, but the electrical conductivity decreases under high load conditions
Solution Approach 1:
The patent utilizes a porous coating layer with controlled pore structure (average pore diameter 0.003-0.010 μm, porosity 30-60%) formed on the nickel hydroxide particle surface. The porous structure provides both mechanical adhesion through surface penetration and electrical conductivity pathways through the interconnected pore network, resolving the contradiction between covering layer uniformity and electrical conductivity under high load conditions.
Solution Approach 2:
The patent creates a composite structure consisting of nickel hydroxide core particles covered with a porous cobalt-containing compound layer. This composite material combines the high capacity of nickel hydroxide with the conductivity and structural stability of cobalt compounds, while the porous architecture ensures both good adhesion and maintained electrical conductivity during high-rate charge-discharge operations.
2Reliability
If high cobalt content is used in nickel-containing composite hydroxide particle to improve battery characteristics, then the covering layer uniformity is improved, but the volume resistivity increases
Solution Approach 1:
The patent employs a porous coating layer structure with controlled pore size (0.003-0.010 μm) and porosity (30-60%) that allows electrical charge transport through the coating layer. The porous architecture creates conductive pathways that bypass the resistive cobalt-containing compound, enabling high cobalt content for improved battery characteristics while maintaining low volume resistivity through the interconnected pore network.
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 optimized positive electrode material reduces volume resistivity, thereby improving the battery's utilization rate and overall performance by ensuring better electrical conductivity and adhesiveness.
Implementation Method 1
produced through a coprecipitation method with controlled pH and flow rates
Data Source
AI summary
A positive electrode material for a nickel metal hydride secondary battery and a method for producing the positive electrode material for a nickel hydrogen secondary battery, capable of improving characteristics of a nickel metal hydride secondary battery by lowering volume resistivity, are provided. The positive electrode material for a nickel metal hydride secondary battery has, in a differential pore distribution in which a pore diameter range is 1.7 nm or more and 300 nm or less, a local maximum value of a highest peak of a differential pore volume positioned in a range of a pore diameter of 1.7 nm or more and 10.0 nm or less.