Nickel Complex Oxide Surface Carbon Control for Battery Cycle Life
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Solution Overview
Problem
Lithium-ion batteries using lithium nickel complex oxide as cathode material face challenges with high reaction resistance, which affects battery performance and cycle characteristics, especially under high temperature conditions, limiting their application in portable devices and electric vehicles due to inferior performance compared to lithium cobalt complex oxide systems.
Innovation Solution
A nickel complex oxide with a carbon content of 0.15% by mass or lower is used as a raw material to manufacture lithium nickel complex oxide, reducing reaction resistance by controlling the carbon content and aluminum mass ratio on the particle surfaces, thereby enhancing the battery's cycle characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If lithium nickel complex oxide is synthesized purely from nickel, then cost is reduced compared to cobalt system, but cycle characteristics deteriorate and battery performance is easily impaired by high temperature
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the particle interior maintains high nickel content (90-100 atom%) for cost effectiveness, while the particle surface contains nickel, cobalt, and aluminum in specific ratios (40-60:20-40:5-15 atom%) for improved cycle characteristics and high-temperature stability. This spatial differentiation of composition resolves the contradiction between cost reduction and reliability improvement.
2Ease of manufacture
If carbon content on particle surface is increased to improve manufacturing, then ease of manufacture is improved, but reaction resistance increases and battery performance deteriorates
Solution Approach 1:
The patent applies parameter changes by strictly controlling the carbon content on the particle surface to be 0.15 mass% or less, and optimizing the surface composition ratios of nickel (40-60 atom%), cobalt (20-40 atom%), and aluminum (5-15 atom%). These parameter optimizations reduce reaction resistance while maintaining ease of manufacture through controlled synthesis conditions.
Data Source
AI summary
A nickel complex oxide having a carbon content of 0.15% by mass or lower.