Zinc Electrode with Thermoplastic Binder for Rechargeable Battery Stability
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Solution Overview
Problem
Zinc anodes in rechargeable batteries suffer from poor deep cycle lifetime, zinc active mass dissolution, and mechanical stress due to dendrite growth and shape changes, leading to reduced capacity and cell failure in alkaline electrolyte systems.
Innovation Solution
A rechargeable zinc electrode composition comprising a current collector, zinc or zinc alloy powder, zinc oxide powder, a thermoplastic organic binder, and optionally a gelling agent, with a porosity of at least 50%, which includes a stabilizing agent to prevent zinc redistribution and dendrite formation, and a method of producing this electrode by mixing and sintering the components at temperatures above the polymer binder's melting point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If zinc powder is mixed with organic binder and electrolyte to form a paste anode, then the electrode can be manufactured with basic structural integrity, but the zinc active mass dissolves and redistributes non-uniformly during cycling, causing shape change failure
Solution Approach 1:
The patent uses a composite material system consisting of zinc powder, zinc oxide powder, and a thermoplastic polymer binder (such as PTFE, PFA, or FEP) to create a paste anode. This composite structure provides both manufacturability and dimensional stability during cycling, preventing the zinc redistribution issue while maintaining ease of production through paste formation and sintering processes.
Solution Approach 2:
The patent applies parameter changes by controlling the sintering temperature (above the melting point of the polymer binder, typically 260-350°C) to transform the paste structure into a sintered electrode. This thermal processing parameter change creates a stable matrix that immobilizes zinc particles, preventing their redistribution during charge/discharge cycles while maintaining the electrode's structural integrity.
2Shape
If organic binder is used to maintain shape stability, then the electrode structure is maintained, but the organic powder binder coagulates as a film on the outside of the electrode, reducing its binding effectiveness
Solution Approach 1:
The patent uses parameter changes by heating the electrode above the melting point of the thermoplastic polymer binder during sintering. This thermal parameter change transforms the binder from a powder state to a melted and re-solidified state, creating a cohesive matrix that prevents coagulation into external films while maintaining shape stability and binding effectiveness throughout cycling.
Solution Approach 2:
The patent exploits phase transitions of the thermoplastic polymer binder by melting it during sintering (transition from solid to liquid) and then allowing it to re-solidify upon cooling. This phase transition process ensures uniform distribution of the binder throughout the electrode matrix, preventing surface coagulation and maintaining both shape stability and reliability during operation.
3Duration of action of moving object
If zinc electrode is cycled in alkaline electrolyte, then rechargeable operation is achieved, but dendrites grow uncontrolled between electrodes, causing short circuit and cell failure
Solution Approach 1:
The patent employs a composite material structure where zinc powder and zinc oxide powder are embedded in a thermoplastic polymer matrix. This composite structure physically constrains zinc particle movement and promotes uniform zinc deposition during cycling, preventing dendrite formation and enabling long cycle life in rechargeable alkaline batteries.
Solution Approach 2:
The patent applies parameter changes through controlled sintering above the polymer binder's melting point, creating a stable three-dimensional matrix structure. This structural parameter change provides physical barriers that guide zinc ion deposition and prevent uncontrolled dendrite growth, thereby extending cycle life while eliminating the harmful short-circuit failure mode.
4Duration of action of moving object
If zinc redistributes on cycling to gather on lower portions, then mechanical stress increases and capacity fades, but the electrode structure collapses, reducing active area
Solution Approach 1:
The patent uses a composite material system where zinc and zinc oxide particles are bound within a thermoplastic polymer matrix. This composite structure provides mechanical strength to the electrode while accommodating zinc redistribution, preventing structural collapse and maintaining active area throughout the battery's cycle life.
Solution Approach 2:
The patent applies parameter changes through sintering treatment above the polymer binder's melting point, creating a robust three-dimensional network structure. This thermal processing parameter change enhances the electrode's mechanical strength and structural stability, enabling it to withstand zinc redistribution during cycling without collapsing, thereby maintaining both mechanical integrity and electrochemical performance over extended periods.
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 failure modes by immobilizing zinc active mass, enhancing mechanical stability and maintaining electrode structure during charge/discharge cycles, resulting in improved cycle life and capacity retention.
Implementation Method 1
a thermoplastic organic binder material
Implementation Method 2
sintering the components at temperatures above the polymer binder's melting point
Implementation Method 3
temperatures above the polymer binder's melting point
Implementation Method 4
wherein said electrode is porous
Data Source
AI summary
The present invention relates to zinc electrode and to methods of producing zinc electrode and particularly to a method of producing zinc electrode providing dimensional/geometrical stability during a battery charge/discharge operation. The invention provides methods of use of batteries comprising the zinc electrode of this invention. Applications of batteries of this invention include electric vehicles, portable electronics and drones.