All-Solid Battery Cathode Groove Structure for Higher Ionic Conductivity
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Solution Overview
Problem
All-solid-state batteries face challenges in enhancing ionic conductivity between the positive electrode plate and the negative electrode plate, which affects lithium ion transfer and can lead to lithium dendrite formation and performance degradation.
Innovation Solution
The introduction of a groove structure in the positive electrode mixture layer filled with a solid electrolyte, connecting it to the solid electrolyte layer, increases the lithium ion transfer area by providing an additional conductive path, thereby improving ionic conductivity and reducing dendrite generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional solid electrolyte layer is used without additional structures, then the battery structure is simple, but the ionic conductivity between positive and negative electrode plates is insufficient
Solution Approach 1:
The positive electrode plate is segmented by forming grooves that divide the solid electrolyte layer into multiple regions. This segmentation creates additional interfaces and pathways for lithium ion transport, thereby enhancing overall ionic conductivity without significantly complicating the manufacturing process
Solution Approach 2:
The invention introduces a vertical dimension to ionic transport by forming grooves that extend through the solid electrolyte layer thickness. This creates three-dimensional ion conduction pathways, transforming the traditionally two-dimensional planar transport into a multi-dimensional network that improves conductivity
2Reliability
If the solid electrolyte layer thickness is increased to improve stability, then the structural integrity is enhanced, but the lithium ion transfer efficiency decreases
Solution Approach 1:
By segmenting the thick solid electrolyte layer through grooves, the invention creates multiple shorter conduction pathways. Lithium ions can travel through these segmented paths rather than across the entire thickness, maintaining structural integrity while reducing effective transport distance and improving ion transfer speed
Solution Approach 2:
The grooves create local regions with different properties - the groove walls provide enhanced conduction pathways with smaller effective thickness. This local modification allows the bulk of the electrolyte to maintain its structural integrity while localized regions facilitate faster ion transport
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 lithium ion transfer and reduces dendrite formation, leading to improved ionic conductivity and extended battery performance by increasing the lithium ion transfer area and maintaining structural integrity.
Implementation Method 1
The solid electrolyte layer is a medium that conducts lithium ions
Implementation Method 2
lithium ions moved from the positive electrode plate are deposited as a metal on the negative electrode plate to be accumulated
Data Source
AI summary
An embodiment of the present disclosure provides an all-solid-state battery that improves ionic conductivity of a positive electrode plate. The all-solid-state battery includes: a positive electrode plate configured to include a positive electrode mixture layer on a positive electrode current collector; a solid electrolyte layer disposed at a first side of the positive electrode plate; and a negative electrode plate positioned at a first side of the solid electrolyte layer, wherein the positive electrode mixture layer forms a groove having a depth in a stacking direction, and the solid electrolyte layer further includes a charging portion filled in the groove.