Positive Electrode Mixture Balancing O2 Particle Orientation and Capacity
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Solution Overview
Problem
Positive electrode active materials with an O2-type structure in lithium-ion batteries have limitations in capacity when used in positive electrode active material layers.
Innovation Solution
A positive electrode mixture comprising a plate-like first active material and a spherical second active material with an O2-type structure, where the ratio of their diameters is between 0.1 and 1.5, and the first active material constitutes between 10% to 90% of the mixture by mass, enhancing the capacity of lithium-ion batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If plate-like O2-type active material is used to improve capacity, then the capacity increases, but the orientation of plate surfaces becomes non-random reducing utilization rate
Solution Approach 1:
The patent combines plate-like O2-type active material with spherical O3-type active material to form a composite positive electrode mixture. The spherical particles act as spacers that prevent excessive alignment of plate-like particles, maintaining orientation randomness while preserving the high capacity benefits of the plate structure.
Solution Approach 2:
The patent applies different particle morphology strategies to different components of the positive electrode: plate-like structures are used for high capacity, while spherical structures are introduced specifically to control orientation and improve utilization rate. Each component has a localized function that addresses a specific aspect of the contradiction.
2Quantity of substance
If only O2-type active material is used, then capacity is improved, but manufacturing complexity increases due to specific ratio control requirements
Solution Approach 1:
The patent specifies a quantitative range for the mass ratio of plate-like to spherical particles (10:90 to 90:10), transforming the complex orientation control problem into a manageable parameter specification. This parameter-based approach simplifies manufacturing by providing clear mixing ratios rather than requiring complex process control.
3Ease of manufacture
If plate-like active material surfaces are aligned, then manufacturing is easier, but capacity utilization rate decreases
Solution Approach 1:
The patent introduces spherical O3-type particles into the mixture. These spherical particles serve as physical spacers that prevent the plate-like particles from aligning parallel to each other, thereby maintaining random orientation and high utilization rate while still allowing for relatively simple manufacturing processes.
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 proposed mixture configuration increases the capacity of lithium-ion batteries by randomizing the orientation of plate-like active material surfaces and contributing to improved utilization rates, thereby enhancing overall battery performance.
Implementation Method 1
a positive electrode mixture comprising a first active material and a second active material, wherein the first active material has an O2-type structure and is plate-like, the second active material has an O2-type structure and is spherical
Data Source
AI summary
Disclosed is a technique that can improve capacity of a positive electrode active material having an O2-type structure when applied to a positive electrode active material layer of a lithium-ion battery. The positive electrode mixture of the present disclosure comprises a first active material and a second active material, the first active material has an O2-type structure and is plate-like, the second active material has an O2-type structure and is spherical, a ratio D1L/D2 of a long diameter D1L of the first active material to a diameter D2 of the second active material is 0.1 or greater and 1.5 or less, and a ratio of the first active material relative to a total of the first active material and the second active material is 10% by mass or greater and 90% by mass or less.