LDH Separator Zinc Battery Assembly and Dendrite Control
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Solution Overview
Problem
Secondary zinc batteries face issues with short circuits due to zinc dendrite growth, which reduces their charge and discharge repetition lifetime, and existing solutions like LDH separators require complex and burdensome processes for assembly and sealing, especially in stacked-cell batteries.
Innovation Solution
A secondary zinc battery configuration using an LDH-like compound separator that covers the negative-electrode active material layer, allowing for easy assembly and electricity collection, while preventing zinc dendrite propagation through its hydroxide ion-conductive properties and simplified production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an LDH separator is used to block zinc dendrites, then short circuit prevention is improved, but assembly complexity and sealing requirements increase
Solution Approach 1:
The separator and battery container are merged into a single integrated component. The container's side walls directly form the separator structure, eliminating the need for separate separator pieces and complex sealing processes. This integration maintains dendrite-blocking functionality while dramatically simplifying assembly.
Solution Approach 2:
The container serves multiple functions: it provides structural housing for the battery and simultaneously acts as the separator that blocks zinc dendrites. This multi-functionality eliminates the need for dedicated separator components and their associated sealing requirements.
2Reliability
If an LDH separator is used to prevent zinc dendrite propagation, then battery reliability is improved, but manufacturing process complexity increases
Solution Approach 1:
The manufacturing process produces the container and separator as a single integrated component. The side walls of the container are formed to directly provide the separator function, eliminating separate manufacturing steps for producing and assembling distinct separator pieces.
Solution Approach 2:
The container is designed with segmented side walls that are formed separately but integrated during manufacturing. This segmentation allows for easier production of individual wall sections while maintaining the overall separator function when assembled.
3Reliability
If traditional separator joining and sealing methods are used, then liquid tightness is ensured, but production time and process burden increase
Solution Approach 1:
The container and separator are merged into one component, eliminating the joining and sealing operations that would otherwise be required. The single-piece construction inherently provides liquid tightness without additional sealing steps.
Solution Approach 2:
The complex joining and sealing processes are extracted from the manufacturing workflow by designing the container to inherently provide separator functionality. This removes unnecessary production steps and accelerates manufacturing.
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 LDH-like compound separator effectively blocks zinc dendrite growth, enhancing the battery's alkali resistance and simplifying the assembly process, leading to improved performance and reliability in secondary zinc batteries, particularly in stacked-cell configurations.
Implementation Method 1
an LDH separator selectively permitting the migration of hydroxide ions while blocking zinc dendrites
Data Source
AI summary
There is provided a secondary zinc battery including: a unit cell including; a positive-electrode plate including a positive-electrode active material layer and a positive-electrode collector; a negative-electrode plate including a negative-electrode active material layer containing zinc and a negative-electrode collector; an LDH separator covering or wrapping around the entire negative-electrode active material layer; and an electrolytic solution. The positive-electrode collector has a positive-electrode collector tab extending from one edge of the positive-electrode active material layer, and the negative-electrode collector has a negative-electrode collector tab extending from the opposite edge of the negative-electrode active material layer and beyond a vertical edge of the LDH-like compound separator. The unit cell can thereby collects electricity from the positive-electrode collector tab and the negative-electrode collector tab that are disposed at opposite edges of the unit cell. The LDH-like compound separator has at least two continuous closed edges.