Plate-Like Cathode Particles with Intersecting (003) Planes
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Solution Overview
Problem
Conventional lithium secondary batteries face limitations in capacity, durability, and rate characteristics due to the orientation of crystal planes in cobalt-based cathode active materials, where lithium ions are intercalated and deintercalated, leading to suboptimal performance.
Innovation Solution
The development of plate-like particles and films with a layered rock salt structure where the (003) plane is oriented intersecting the particle surface, maximizing exposure of the (104) plane for lithium ion intercalation and deintercalation, enhancing capacity, durability, and rate characteristics by optimizing the crystal plane orientation and manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the (003) plane is oriented parallel to the plate surface to simplify manufacturing, then manufacturing precision is improved, but lithium ion intercalation and deintercalation performance deteriorates
Solution Approach 1:
Instead of orienting the (003) plane parallel to the plate surface as in conventional methods, this invention inverts the orientation to make the (003) plane intersect the plate surface. This inversion exposes the (104) plane parallel to the plate surface, which has superior lithium ion intercalation and deintercalation properties, thereby resolving the contradiction between manufacturing simplicity and electrochemical performance.
2Reliability
If the particle thickness is increased to improve durability, then reliability is improved, but the exposure area of favorable crystal planes to electrolyte decreases
Solution Approach 1:
This invention applies local quality by creating plate-like particles with asymmetric crystal plane orientation. The (104) plane is exposed parallel to the plate surface providing large area for lithium ion transport, while the (003) plane intersects the surface. This localized orientation optimization allows thick particles to maintain high surface area exposure of favorable planes, simultaneously improving both durability and electrochemical activity.
3Ease of manufacture
If conventional crystal plane orientation is used to maintain manufacturing simplicity, then ease of manufacture is improved, but capacity and rate characteristic deteriorate
Solution Approach 1:
This invention changes the critical parameter of crystal plane orientation from the conventional (003) parallel configuration to a (003) intersecting configuration. This parameter change fundamentally alters the exposure characteristics, enabling the (104) plane to be exposed parallel to the plate surface, thereby significantly improving discharge capacity and rate characteristics while maintaining manufacturing feasibility through controlled sintering 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
This approach significantly improves the capacity, durability, and rate characteristics of lithium secondary batteries by ensuring maximum exposure of favorable crystal planes to the electrolyte, allowing for higher discharge capacity and prolonged cycle life while maintaining high rate performance.
Implementation Method 1
intercalation and deintercalation of lithium ions (Li+)
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3A~3B
AI summary
An object of the present invention is to provide a lithium secondary battery which has improved capacity, durability, and rate characteristic as compared with conventional lithium secondary batteries. A plate-like particle or a film for a lithium secondary battery cathode active material has a layered rock salt structure. The (003) plane is oriented in a direction intersecting the direction of the plate surface of the particle or film.