Primary Battery Electrolyte Additives for Swelling Suppression
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Solution Overview
Problem
Primary batteries exhibit insufficient swelling characteristics, which is a critical issue that needs improvement.
Innovation Solution
A primary battery configuration featuring a positive electrode with manganese dioxide, a negative electrode made of lithium-based materials, and an electrolytic solution containing an alkali metal compound represented by Formula (1) and a dicarboxylic anhydride compound represented by Formula (2), which synergistically suppresses solvent hydrolysis and decomposition reactions, thereby enhancing the swelling characteristic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrolytic solutions are used, then the battery can operate, but swelling occurs due to solvent hydrolysis and decomposition reactions
Solution Approach 1:
The patent introduces an alkali metal compound as an intermediary substance in the electrolytic solution that mediates between the solvent and electrode materials. This compound suppresses the harmful hydrolysis and decomposition reactions of the solvent by acting as a buffer or protective agent, thereby preventing gas generation and swelling while maintaining battery operation
Solution Approach 2:
The patent modifies the chemical composition parameters of the electrolytic solution by incorporating specific alkali metal compounds (such as lithium hydroxide, sodium hydroxide, or potassium hydroxide) at controlled concentrations. This parameter change transforms the electrolyte's chemical environment to suppress unwanted reactions, reducing swelling characteristic improvement from 0.2mm to less than 0.05mm after high-temperature storage
2Temperature
If manganese oxide is used in the positive electrode, then high-temperature storage characteristic improves, but swelling still occurs
Solution Approach 1:
The patent creates a composite electrolytic system by combining manganese oxide in the positive electrode with alkali metal compounds in the electrolyte. This composite approach allows the manganese oxide to provide high-temperature stability while the alkali metal compound simultaneously suppresses solvent decomposition, achieving both high-temperature storage capability and reduced swelling through synergistic material combination
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 described configuration significantly reduces swelling and maintains superior electrical characteristics, including increased discharge capacity and stable electric resistance, by effectively preventing gas generation due to solvent hydrolysis and decomposition reactions.
Implementation Method 1
synergistically suppresses solvent hydrolysis and decomposition reactions
Implementation Method 2
synergistically suppresses solvent hydrolysis and decomposition reactions
Implementation Method 3
The positive electrode includes manganese dioxide. The negative electrode includes a lithium-based material.
Data Source
AI summary
A primary battery includes a positive electrode, a negative electrode, and an electrolytic solution. The positive electrode includes manganese dioxide. The negative electrode includes a lithium-based material. The electrolytic solution includes an alkali metal compound represented by Formula (1) and a dicarboxylic anhydride compound represented by Formula (2).MeN(CxF2x+1SO2)(CyF2y+1SO2) (1)where:Me is an alkali metal element; andx and y are each an integer of 0 or greater.W(—C(═O)—O—C(═O)—)z (2)where:W is a benzene-based aromatic ring from which 2z-number of hydrogen atoms are eliminated; andz is an integer of 2 or greater.