Zinc Anode Electrocoagulant Additive for Cycle Life
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Solution Overview
Problem
Zinc anode batteries face issues with irreversible characteristics, such as shape-change and dendrite formation, leading to short circuits and limited cycle life, which reduces energy density and utilization, making them unsuitable for many applications.
Innovation Solution
Incorporating electrocoagulants like aluminum, iron, titanium, or their hydroxides into the battery to coagulate zincate ions near the anode, preventing migration and increasing the reversibility of zinc oxide, thereby enhancing cycle life and utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If zinc anode is used in rechargeable batteries, then high energy density is achieved, but irreversible characteristics (shape-change, dendrite formation) occur leading to short circuit and limited cycle life
Solution Approach 1:
The patent introduces an intermediary substance (organic additive or coating layer) between the zinc anode and the electrolyte to prevent direct harmful interactions. This intermediary layer blocks dendrite formation and shape-change while allowing ionic transport, thus maintaining high energy density while improving cycle life and reliability.
Solution Approach 2:
The patent modifies the chemical composition and physical properties of the electrolyte by adding organic additives or forming protective coating layers. These parameter changes alter the deposition behavior of zinc ions, preventing irreversible characteristics and improving both energy density utilization and cycle life.
2Reliability
If zinc anode is cycled to less than 8% of theoretical capacity, then cycle life is increased, but overall energy density is limited
Solution Approach 1:
The patent changes the electrochemical parameters of the system by introducing organic additives or protective coatings that enable stable zinc deposition at higher capacities. This allows the battery to operate at greater than 8% theoretical capacity while maintaining long cycle life, thus resolving the trade-off between energy density and reliability.
3Reliability
If zincate ions are allowed to migrate in electrolyte, then zinc dissolution occurs leading to shape-change, but preventing migration reduces zinc utilization
Solution Approach 1:
The patent uses an intermediary protective layer or organic additive that selectively interacts with zincate ions. This intermediary prevents harmful migration and shape-change while maintaining ionic conductivity for necessary zinc utilization, thus balancing structural stability with productivity.
Solution Approach 2:
The patent creates localized regions with different properties - a protective interface layer near the zinc anode that prevents shape-change, while maintaining bulk electrolyte properties that allow adequate zinc utilization. This local quality differentiation resolves the contradiction between structural stability and productivity.
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 electrocoagulants increases zinc utilization to 15-40% and cycle life to 200-1000 cycles, rendering zinc anode batteries more suitable for high-depth discharge and long-term use in various applications.
Implementation Method 1
Incorporating electrocoagulants like aluminum, iron, titanium, or their hydroxides into the battery to coagulate zincate ions near the anode
Implementation Method 2
Zinc undergoes the 2e− reaction through a dissolution-precipitation process to form zinc oxide (ZnO) as the discharged product
Data Source
AI summary
A battery comprises a housing, an electrolyte disposed in the housing, a cathode disposed in the housing, an anode disposed in the housing and comprising an anode material comprising: zinc or zinc oxide, an electrocoagulant material selected from the group consisting of: aluminum, iron, titanium, calcium, zirconium, a hydroxide thereof, a salt thereof, an oxide thereof, and a combination thereof, and a binder.