Zinc Secondary Battery Electrode Layout for Dendrite Short Prevention
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Solution Overview
Problem
Zinc secondary batteries face short circuits due to defects in the lower end sealing portion of hydroxide ion conductive separators, leading to zinc dendrite propagation and reduced charge/discharge life.
Innovation Solution
A zinc secondary battery configuration where the negative electrode active material layer extends below the positive electrode active material layer, with a controlled height difference between the two, housed in a bag-like hydroxide ion conductive separator to minimize the likelihood of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative electrode active material layer is extended below the positive electrode active material layer, then zinc deposits are accumulated in lower extra space preventing short circuits, but battery height increases
Solution Approach 1:
The patent optimizes the height parameter of the negative electrode active material layer extension to a specific range (3-7mm). This parameter change creates the necessary buffer space to prevent short circuits while minimizing the increase in battery height. The controlled extension height balances the conflicting requirements of short circuit prevention and compact battery design.
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 significantly reduces the occurrence of short circuits by accumulating metal zinc deposits in a lower extra space, preventing them from reaching the positive electrode and extending the battery's charge/discharge life.
Implementation Method 1
a battery comprising a layered double hydroxide (LDH) separator that blocks the penetration of zinc dendrite while selectively permeating hydroxide ions
Implementation Method 2
metallic zinc in a dendrite form precipitates from a negative electrode upon charge, penetrates voids of a separator such as a nonwoven fabric, and reaches a positive electrode
Data Source
AI summary
Provided is a zinc secondary battery including a positive electrode plate including a positive electrode active material layer; a negative electrode plate including a negative electrode active material layer; a hydroxide ion conductive separator that is in a bag-like form for housing the negative electrode plate; an electrolytic solution; and a battery case in which the positive electrode plate, the negative electrode plate, and the hydroxide ion conductive separator are vertically housed. The negative electrode active material layer extends to a position lower than a lower end of the positive electrode active material layer, a height from a bottom of the battery case of a lower end of the negative electrode active material layer is 2.0 to 8.0 mm, and a height difference between the lower end of the positive electrode active material layer and the lower end of the negative electrode active material layer is 3.0 to 4.0 mm.