Hollow Cathode Material Layering for All-Solid Lithium Battery Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
All solid lithium batteries face challenges in reducing internal resistance to achieve higher performance, which is not effectively addressed by existing technologies.
Innovation Solution
A cathode active material layer with a hollow structure and specific aspect ratio, combined with a solid electrolyte material, is formed through pressing to create a dense layer with low internal resistance, comprising a flat cathode active material with a hollowness of 0-10% and an aspect ratio of 1.5 or more, and a solid electrolyte material with a sulfide composition, optimized by pressing at high pressures and temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hollow cathode active material particles are used, then Li ion conductivity is improved, but internal resistance increases
Solution Approach 1:
The invention changes the physical parameters of the cathode active material by controlling particle size (3 μm or smaller) and shape (aspect ratio 1.5 or more), transforming hollow particles into a dense layered structure that reduces internal resistance while preserving Li ion conductivity pathways
Solution Approach 2:
The invention creates a composite structure combining cathode active material particles with conductive materials in a layered arrangement, where the composite morphology enhances both electrical conductivity and Li ion transport while minimizing internal resistance
2Object-generated harmful factors
If cathode active material layer is densified, then internal resistance is reduced, but manufacturing complexity increases
Solution Approach 1:
The invention performs preliminary shaping of cathode active material particles into specific size and shape ranges before layer formation, enabling subsequent self-organization into a dense layered structure without requiring complex post-processing or high-pressure densification steps
Solution Approach 2:
The invention transitions from three-dimensional hollow particle structures to a two-dimensional layered arrangement, where particles are organized in stacked layers with controlled orientation, achieving density through dimensional transformation rather than compression
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 solution significantly reduces internal resistance in all solid lithium batteries, enhancing their performance by densifying the cathode active material layer and improving Li ion conductivity.
Implementation Method 1
pressing so strongly as to crush an active material having a hollow structure
Data Source
AI summary
A cathode active material layer used for an all solid lithium battery, comprising a flat cathode active material with a hollowness in a range of more than 0% to 10%, and a solid electrolyte material, characterized in that the flat cathode active material has an aspect ratio (long axis length/short axis length) of 1.5 or more in a section in a thickness direction of the cathode active material layer, and a ratio of the flat cathode active material of which the short axis direction corresponds to a thickness direction of the cathode active material layer is 30% or more with respect to the whole cathode active material.