Zinc Secondary Battery Negative Electrode Polymer Coating
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional zinc secondary batteries face short-circuiting and reduced cycle life due to zinc dendrite formation and morphological changes in the negative electrode, leading to high resistance and decreased charge/discharge efficiency.
Innovation Solution
A negative electrode comprising ZnO particles and Zn particles, where at least a portion of the ZnO particles is covered with a nonionic water-absorbing polymer, which helps to uniformize charging and discharging reactions, inhibiting zinc segregation and accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If zinc is used as negative electrode active material, then high capacity is achieved, but zinc dendrites form causing short-circuiting and reduced cycle life
Solution Approach 1:
The invention changes the physical and chemical parameters of the negative electrode by incorporating ZnO particles with specific particle sizes (0.1-10 μm) and using a composite structure with binder resin and conductive aid. This parameter optimization prevents zinc dendrite formation while maintaining high capacity, resolving the contradiction between capacity and cycle life
Solution Approach 2:
The invention uses a composite negative electrode material consisting of ZnO particles, binder resin, and conductive aid. This composite structure provides both high zinc capacity and prevents dendrite formation, simultaneously achieving high capacity and long cycle life
2Use of energy by moving object
If zinc repeatedly dissolves and precipitates during charge/discharge, then electrochemical activity is maintained, but morphological changes cause high resistance and pore clogging
Solution Approach 1:
The invention optimizes particle size parameters of ZnO (0.1-10 μm) to control the dissolution/precipitation behavior during charge/discharge. This prevents excessive morphological changes and pore clogging while maintaining electrochemical activity, resolving the contradiction between charge/discharge activity and electrode resistance
Solution Approach 2:
The binder resin acts as an intermediary that stabilizes the ZnO particles during repeated charge/discharge cycles. It prevents direct contact between zinc particles and prevents pore clogging, maintaining both electrochemical activity and low resistance
3Ease of manufacture
If conventional negative electrode structure is used, then simple manufacturing is achieved, but zinc segregation and accumulation occur reducing durability
Solution Approach 1:
The invention uses a composite negative electrode material consisting of ZnO particles, binder resin, and conductive aid in specific ratios. This composite structure prevents zinc segregation and accumulation while maintaining manufacturing simplicity, resolving the contradiction between ease of manufacture and battery durability
Solution Approach 2:
The invention applies local quality optimization by using ZnO particles with specific size distribution (0.1-10 μm) and controlling the local composition ratios of binder resin and conductive aid. This prevents zinc segregation in specific regions while maintaining overall manufacturing simplicity
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 use of nonionic water-absorbing polymer-covered ZnO particles in the negative electrode enhances cycle life by maintaining uniform reactions and preventing zinc segregation and accumulation, thereby improving the overall performance and durability of zinc secondary batteries.
Implementation Method 1
a nonionic water-absorbing polymer, wherein at least a portion of the ZnO particles is covered with the nonionic water-absorbing polymer
Data Source
AI summary
Provided is a negative electrode for use in a zinc secondary battery, including a negative electrode active material containing ZnO particles and Zn particles, and a nonionic water-absorbing polymer, and at least a portion of the ZnO particles is covered with the nonionic water-absorbing polymer.