Active Material With Protruding Portions For Battery Interface
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Solution Overview
Problem
Current secondary batteries face challenges in increasing the interface between the electrolyte and active materials, leading to suboptimal ion mobility and charge/discharge efficiency, particularly with lithium cobalt oxide (LiCoO2) and needle-like active materials.
Innovation Solution
The development of an active material with protruding portions in multiple directions, produced through a method involving forming a material layer on a base material, laminating multiple layers, and subjecting them to sintering treatment, which increases the surface area and interface with the electrolyte, enhancing ion mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional active materials (such as LiCoO2 obtained through crystallization by flux method or needle-like active materials) are used, then the battery structure is relatively simple, but the interface area between the active material and electrolyte is insufficient, leading to high electrode resistance and poor ion mobility
Solution Approach 1:
The invention transitions from conventional flat or needle-like active material structures to a three-dimensional protruding structure. The active material forms protruding portions that extend in multiple directions (upward, downward, leftward, rightward) from a central region, effectively adding dimensional complexity to maximize interface area with the electrolyte without requiring complex external device structures.
Solution Approach 2:
The invention creates a porous-like structure through the protruding portions that extend into the electrolyte. This structure increases the effective surface area and creates multiple pathways for ion transport, similar to porous materials, thereby improving ion mobility and reducing electrode resistance while maintaining structural integrity.
2Reliability
If the interface area between active material and electrolyte is increased, then ion mobility improves, but the manufacturing process becomes more complex
Solution Approach 1:
The invention incorporates a base material layer before forming the active material. This base material serves as a preliminary structure that guides the formation of the protruding portions during the sintering process. The base material is later removed, leaving the desired protruding structure, which simplifies the overall manufacturing process compared to directly forming complex 3D structures.
Solution Approach 2:
The base material acts as an intermediary during the manufacturing process. It provides a template for forming the active material with protruding portions and is subsequently removed. This intermediary approach enables the creation of complex protruding structures through a relatively simple lamination and sintering process, avoiding the need for complex direct fabrication methods.
3Productivity
If needle-like active materials are used, then the structure is relatively simple, but the electrode resistance remains high and ion mobility is insufficient
Solution Approach 1:
The invention segments the active material into multiple distinct protruding portions that extend in different directions from a central region. Instead of a single needle-like structure, the active material is divided into multiple segments (upward, downward, leftward, rightward protruding portions), each providing independent interface area with the electrolyte, thereby enhancing overall ion mobility and charge/discharge efficiency.
Solution Approach 2:
The invention creates a composite structure by combining the active material with a base material layer during the lamination and sintering process. This composite approach allows the formation of the complex protruding structure through the interaction of multiple materials, where the base material provides structural support during fabrication and is later removed, leaving the desired active material configuration.
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 results in improved ion mobility and charge/discharge efficiency by increasing the interface between the active material and electrolyte, as evidenced by reduced electrode resistance and enhanced charge/discharge performance in battery applications.
Implementation Method 1
a third step of subjecting the laminated body to sintering treatment to produce an active material
Data Source
AI summary
Provided is an active material including protruding portions protruding in a plurality of directions.