Nickelate Cathode Composition for Longer Alkaline Cell Shelf Life
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Alkaline electrochemical cells with high valent nickel cathodes suffer from limited shelf life due to thermodynamic instability in aqueous electrolytes, affecting their performance and durability.
Innovation Solution
A nickelate cathode material with a specific X-ray diffraction pattern is developed by reacting a sodium compound with a nickel precursor and contacting the resulting nickel compound with an acidic solution, enhancing stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high valent nickel materials (NiOOH, NiO2, nickel oxides) are used as cathode materials to achieve high capacity and cell voltage, then the battery performance is improved, but the shelf life is limited due to thermodynamic instability in aqueous electrolytes causing electrochemical reduction
Solution Approach 1:
The patent introduces a protective coating layer as an intermediary between the high valent nickel cathode material and the aqueous electrolyte. This coating acts as a mediator that prevents direct contact and electrochemical reduction while allowing ionic transport, thereby preserving both the high power output and extending shelf life of the battery
2Quantity of substance
If the quantity of active materials is increased to improve battery performance in fixed cell sizes, then the capacity is enhanced, but the cell construction complexity increases
Solution Approach 1:
The patent utilizes parameter changes by optimizing the oxidation state and crystal structure of nickel compounds to achieve higher capacity per unit mass. By changing the chemical parameters (valence state, phase composition) rather than simply increasing material quantity, the patent enhances performance while maintaining manageable cell construction 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 new nickelate cathode material exhibits improved stability and discharge capacity compared to traditional nickelate materials, extending shelf life and enhancing alkaline electrochemical cell performance.
Implementation Method 1
reacting a sodium compound with a nickel precursor, so as to produce a nickel compound; and contacting said nickel compound with an acidic solution, thereby producing the nickelate cathode material
Data Source
AI summary
Nickelate cathode materials are provided, wherein said cathode material has an X-ray diffraction (XRD) pattern comprising a first peak from about 40.0-41.6 2Θ, and a second peak from about 62.6-63.0 2 Θ. Methods of preparing such cathode materials are also provided. Alkaline electrochemical cells comprising said cathode materials are also provided.