Tungsten Trioxide Phase Control for Battery Surface Uniformity
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Solution Overview
Problem
The variation in the percentage of a compound containing tungsten and lithium on the surfaces of lithium nickel composite oxide particles in non-aqueous electrolyte secondary batteries leads to inconsistent battery characteristics and low output performance.
Innovation Solution
A tungsten trioxide with a specific XRD peak intensity ratio of WO2.90 to WO3.00 less than or equal to 0.15 is used to react with lithium nickel composite oxide particles, ensuring uniform formation of the compound and reducing reaction resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional tungsten trioxide is used to form compound on lithium nickel composite oxide particles, then the battery can achieve high capacity, but the percentage of compound containing tungsten and lithium varies among particles leading to inconsistent battery characteristics
Solution Approach 1:
The invention changes the chemical composition parameters of tungsten trioxide by controlling the ratio of WO2.90 to WO3.00 phases through specific heat treatment conditions. This parameter change ensures uniform reactivity across all particles, leading to consistent compound formation percentage and uniform battery characteristics while maintaining high capacity.
2Power
If tungsten compound is added to lithium nickel composite oxide particles, then high power can be achieved, but reaction resistance increases due to non-uniform compound formation
Solution Approach 1:
The invention optimizes the oxygen content parameter of tungsten trioxide by controlling the WO2.90/WO3.00 phase ratio. This creates an optimal balance where the compound formation provides high power benefits while minimizing reaction resistance through uniform distribution and controlled reactivity.
3Ease of manufacture
If lithium-free tungsten compound powder is mixed with lithium nickel composite oxide particles, then compound formation can occur, but battery characteristics become inconsistent due to particle variation
Solution Approach 1:
The invention modifies the tungsten trioxide precursor parameters (phase composition, oxygen content, particle size) to achieve uniform reaction behavior. This ensures that when the compound forms during battery operation, it does so consistently across all particles, producing reliable and consistent battery characteristics while maintaining ease of manufacture.
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 suppresses variation in the compound's percentage among particles, improving the output characteristics and cycle performance of the battery by enhancing the reactivity and uniform dispersion of tungsten and lithium on the particles' surfaces.
Implementation Method 1
when reacted with lithium nickel composite oxide particles, can suppress variation among the particles in the percentage of a compound containing tungsten and lithium
Implementation Method 2
IWO2.90/IWO3.00 indicates a ratio of a peak intensity IWO2.90 of a (200) plane of WO2.90 to a peak intensity IWO3.00 of a (200) plane of WO3.00 in an XRD pattern
Data Source
AI summary
A tungsten trioxide whose IWO2.90/IWO3.00 is less than or equal to 0.15 is provided. IWO2.90/IWO3.00 indicates a ratio of a peak intensity IWO2.90 of a (200) plane of WO2.90 to a peak intensity IWO3.00 of a (200) plane of WO3.00 in an XRD pattern.