Alkali Dry Cell Zinc Precipitation via Sulfur Additive
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Solution Overview
Problem
Alkaline dry batteries face issues with hydrogen generation and electrolyte leakage when misused, leading to safety vent activation and potential device malfunction, as the zinc precipitation reaction occurs prematurely due to reduced zinc ions in the electrolyte during charging.
Innovation Solution
Incorporating a sulfur-containing cyclic compound as an additive in the negative electrode, which facilitates zinc precipitation and forms a surface film, delaying the negative electrode potential drop and reducing hydrogen generation, thereby suppressing electrolyte leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the alkaline dry battery is charged by misuse, then hydrogen gas generates and battery internal pressure rises, but the safety vent activates to release hydrogen causing electrolyte leakage
Solution Approach 1:
The patent adds zinc oxide to the alkaline electrolyte in advance before any misuse occurs. This preliminary action ensures that sufficient zinc ions are available in the electrolyte to suppress hydrogen generation at the negative electrode during mischarging, preventing the safety vent from activating and electrolyte from leaking.
Solution Approach 2:
The patent changes the chemical composition parameter of the electrolyte by adding zinc oxide. This parameter change increases the concentration of zinc ions in the electrolyte, which fundamentally alters the electrochemical behavior during mischarging by suppressing the hydrogen generation reaction at the negative electrode.
2Quantity of substance
If zinc ions in the electrolyte decrease during mischarging, then the resistance to zinc precipitation reaction increases and negative electrode electric potential drops rapidly, but hydrogen generation increases and safety vent activates
Solution Approach 1:
The patent changes the concentration parameter of zinc ions in the electrolyte by adding zinc oxide. This ensures that even during prolonged mischarging, the zinc ion concentration remains sufficient to maintain low resistance to zinc precipitation reaction, preventing rapid potential drop and hydrogen generation.
Solution Approach 2:
The zinc oxide added to the electrolyte serves as a self-replenishing source of zinc ions. During mischarging, as zinc ions are consumed at the negative electrode, the zinc oxide in the electrolyte continuously dissolves to replenish zinc ions, maintaining the suppression of hydrogen generation without external intervention.
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 sulfur-containing cyclic compound effectively delays the negative electrode potential drop, reducing hydrogen generation and preventing electrolyte leakage, even when the battery is charged incorrectly, thus enhancing safety and battery performance.
Implementation Method 1
zinc precipitation due to the reduction of the zinc ions in the electrolyte proceeds
Implementation Method 2
zinc precipitation due to the reduction of the zinc ions in the electrolyte proceeds
Implementation Method 3
the sulfur-containing cyclic compound effectively delays the negative electrode potential drop, reducing hydrogen generation and preventing electrolyte leakage
Implementation Method 4
an alkaline electrolyte retained in the positive electrode, the negative electrode, and the separator
Data Source
AI summary
An alkaline dry battery including: a positive electrode; a negative electrode; a separator disposed between the positive electrode and the negative electrode; and an alkaline electrolyte retained in the positive electrode, the negative electrode, and the separator. The negative electrode includes a negative electrode active material containing zinc, and an additive. The additive includes a sulfur-containing cyclic compound.