Positive Electrode Material Tuning for Pulse Power and Cycle Stability
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Solution Overview
Problem
Existing batteries fail to meet the demands for high pulse power and long cycle stability, primarily due to inadequate performance of electrode materials.
Innovation Solution
A positive electrode active material is developed with specific relationships between porosity (P), crystal plane dimension (D), and diffraction angle splitting (Δθ) (300≤P*D/Δθ≤800), along with a compound formula LixNiyCozMnkMpO2, and controlled particle sizes, to enhance lithium-ion battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If existing electrode materials are used, then batteries can operate, but they cannot achieve both high pulse power and long cycle stability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the porosity (P), crystal plane dimension (D), and diffraction angle splitting (Δθ) of the positive electrode active material to satisfy the relationship 300≤P*D/Δθ≤800. This optimization of structural parameters enables the material to achieve both high pulse power and long cycle stability simultaneously, resolving the technical contradiction between power output and cycle reliability.
Solution Approach 2:
The patent employs composite materials through the compound formula LixNiyCozMnkMpO2, where M includes multiple elements such as B, Y, Nb, In, La, Zr, Ce, W, Al, Ti, Sr, Mg, Sb, V, Zn, Cu, Cr, and Fe. This multi-element composite structure synergistically improves both the power performance and cycle stability of the battery, addressing the contradiction between pulse power and long-term reliability.
2Power
If porosity is increased to improve power performance, then pulse power increases, but structural stability may deteriorate
Solution Approach 1:
The patent resolves this contradiction by optimizing the porosity parameter within a specific range (30%≤P≤65%) and combining it with controlled crystal plane dimension (500 Å≤D≤1000 Å) and diffraction angle splitting (0.3°≤Δθ≤0.8°). This balanced parameter optimization ensures that the material maintains sufficient porosity for high power performance while preserving structural stability through the controlled crystal structure.
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 material achieves high pulse power and significantly improved cycle performance, with reduced leakage current and extended battery life.
Implementation Method 1
the lithium-ion battery prepared with this positive electrode active material has high pulse power while having significantly improved cycle performance
Data Source
AI summary
A positive electrode active material, a secondary battery, and an electric device are disclosed. The positive electrode active material satisfies the following relationship: 300≤P*D/Δθ≤800; where P represents the porosity of the positive electrode active material, with a unit of %; D represents the crystal plane dimension of the (110) crystal plane of the positive electrode active material, with a unit of Å; and Δθ represents a splitting degree between a diffraction angle of the (110) crystal plane and that of (108) crystal plane of the positive electrode active material, with a unit of °.