Alkaline Battery Electrolyte Additive for Dendrite Suppression
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Solution Overview
Problem
Alkaline storage batteries with zinc as the negative active material face issues such as hydrogen gas generation and dendrite formation, leading to reduced charge-discharge cycle life due to insufficient stability and solubility of existing additives in high-alkaline solutions.
Innovation Solution
Incorporating a chain saturated hydrocarbon compound with a hydrophilic functional group other than a hydroxyl group and a molecular weight of 400 or more into the alkaline electrolyte to suppress dendrite formation and improve stability and solubility, thereby enhancing charge-discharge cycle performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If zinc is used as the negative active material to achieve high energy density, then the energy density and power density are improved, but hydrogen gas generation and dendrite formation occur leading to reduced cycle life
Solution Approach 1:
A compound containing a carboxyl group and having a molecular weight of 400 or more is introduced as an intermediary substance in the electrolyte. This compound mediates between the zinc negative electrode and the alkaline electrolyte, suppressing dendrite formation and hydrogen gas generation while maintaining high energy density, thereby resolving the contradiction between energy density and cycle life
Solution Approach 2:
The molecular weight parameter of the additive compound is specifically set to 400 or more, which changes the physical and chemical properties of the electrolyte system. This parameter change enables the compound to effectively suppress dendrite formation and improve charge-discharge cycle life while maintaining high energy density
2Reliability
If existing additives are used to suppress dendrite formation, then dendrite growth is reduced, but the additives have insufficient stability and solubility in high-alkaline solutions
Solution Approach 1:
The molecular weight parameter of the additive is specifically designed to be 400 or more, which fundamentally changes the stability and solubility characteristics of the additive in high-alkaline solutions. This parameter change enables the additive to maintain both effective dendrite suppression and high stability in the electrolyte environment
3Stability of the object's composition
If a compound with higher molecular weight is used to improve stability, then stability at high potentials is improved, but solubility in the electrolyte may be reduced
Solution Approach 1:
The compound is designed with specific local chemical characteristics - containing a carboxyl group functional group - which provides localized polarity and hydrophilicity. This local quality enhancement enables the high molecular weight compound (400 or more) to maintain both high stability at high potentials and adequate solubility in the aqueous alkaline electrolyte
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 this compound in the electrolyte significantly improves the cycle characteristics of alkaline storage batteries by preventing dendrite formation and ensuring stability at high potentials, while maintaining high solubility in high-alkaline solutions, thus extending the battery's charge-discharge life.
Implementation Method 1
the alkaline electrolyte contains a compound which is a chain saturated hydrocarbon at least partially having a hydrophilic functional group other than a hydroxyl group and having a molecular weight of 400 or more and less than 220000... suppress dendrite formation
Implementation Method 2
having a hydrophilic functional group other than a hydroxyl group... maintaining high solubility in high-alkaline solutions
Data Source
AI summary
An alkaline storage battery contains: a positive electrode; a negative electrode containing, as an active material, at least one of a metal capable of forming a dendrite and a metal compound thereof; and an alkaline electrolyte. The alkaline electrolyte contains a compound which is a chain saturated hydrocarbon at least partially having a hydrophilic functional group other than a hydroxyl group and having a molecular weight of 400 or more and less than 220000 in an amount of less than 15 g per 100 mL of the electrolyte.