Positive Electrode Particle Orientation for Li-Ion Rate Performance
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Solution Overview
Problem
Current positive electrodes for lithium ion batteries do not effectively enhance rate characteristics due to the orientation of the (003) plane of primary particles relative to the plate face, which affects lithium ion intercalation and deintercalation processes.
Innovation Solution
The positive electrode is configured with primary particles of lithium composite oxide having a layered rock-salt structure, where the average orientation angle of these particles relative to the plate face is between 0° and 30°, and the aggregate surface area of particles with an aspect ratio greater than or equal to 4 accounts for more than 70% of the total area, optimizing lithium ion conductivity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the (003) plane of primary particles is oriented to intersect the plate face to expose the crystal plane that facilitates lithium ion intercalation and deintercalation, then lithium ion conductivity is improved, but the rate characteristics are not effectively enhanced
Solution Approach 1:
The patent changes the orientation angle parameter of the (003) plane from the conventional intersecting orientation to a specific angular range (10° to 30°) relative to the plate face. This parameter optimization resolves the contradiction by achieving both improved lithium ion conductivity and enhanced rate characteristics through precise control of crystal plane orientation.
2Stability of the object's composition
If the orientation angle of the (003) plane is increased to reduce stress between the positive electrode and solid electrolyte, then cycle performance is improved, but lithium ion intercalation and deintercalation efficiency may be affected
Solution Approach 1:
The patent optimizes the orientation angle parameter within the range of 10° to 30° to simultaneously achieve stress reduction for improved cycle performance and maintained lithium ion conductivity. This parameter optimization resolves the contradiction by finding the optimal balance point where both stability and productivity are enhanced.
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 configuration enhances the rate characteristics and cycle performance of the lithium ion battery by reducing stress between the positive electrode and solid electrolyte, enabling smoother lithium ion intercalation and deintercalation, and improving the battery's overall performance.
Implementation Method 1
exposure of the crystal plane, that facilitates intercalation and deintercalation of lithium ions
Data Source
AI summary
A positive electrode is configured by plurality of mutually bonded primary particles respectively composed of a lithium composite oxide having a layered rock-salt structure. An average orientation angle of the plurality of primary particles relative to a plate face direction parallel to a plate face is more than 0° and less than or equal to 30°. An aggregate surface area of primary particles that have an aspect ratio of greater than or equal to 4 is greater than or equal to 70% relative to a total area of the plurality of primary particles, in cross section.