Battery Electrolyte Additives for Low-Resistance Electrode Coatings

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Solution Overview

Problem

Current secondary batteries exhibit insufficient battery characteristics, necessitating the development of an electrolytic solution that enhances performance by reducing electrical resistance and preventing electrode reactant precipitation.

Innovation Solution

A secondary battery-use electrolytic solution containing a phenyl isothiocyanate compound and optionally a benzothiazole compound, which form low-resistance coating films on electrodes, reducing overvoltage and preventing reactant precipitation, thereby stabilizing charge-discharge reactions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional electrolytic solutions are used, then the battery can operate, but the electrical resistance is high and battery characteristics are insufficient

Engineering Contradiction:

Improvebattery characteristicsVSAvoidelectrical resistance

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by introducing a phenyl isothiocyanate compound with specific molecular structure parameters (Formula 1 with R1-R5 groups) into the electrolytic solution. This chemical parameter change modifies the electrolyte's properties to reduce electrical resistance and improve battery characteristics, directly resolving the contradiction between operational reliability and energy loss.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite materials by combining the phenyl isothiocyanate compound with other electrolytic solution components (solvents, salts, and optionally benzothiazole compounds) to create a composite electrolytic solution system. This composite approach synergistically reduces electrical resistance while maintaining stable charge-discharge reactions, addressing both reliability and energy efficiency.

Inventive Principle:

Principle #40Composite materials

2Duration of action of moving object

If conventional electrolytic solutions are used, then the battery can charge and discharge, but reactant precipitation occurs on electrodes

Engineering Contradiction:

Improvecharge-discharge stabilityVSAvoidreactant precipitation

Core Design Contradiction:

Duration of action of moving objectVSObject-generated harmful factors

Solution Approach 1:

The phenyl isothiocyanate compound acts as an intermediary substance that mediates between the electrode reactants and the electrode surfaces. It forms a protective interface layer that prevents direct contact and precipitation of reactants on electrodes, while still allowing charge transfer, thus eliminating the harmful precipitation effect without compromising charge-discharge stability.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent converts the potential harm of reactant precipitation into a benefit by using the phenyl isothiocyanate compound to form a controlled surface modification on electrodes. This surface modification prevents uncontrolled precipitation while enhancing electrode performance, transforming what would be a harmful accumulation into a beneficial surface treatment.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Loss of energy

If the electrolytic solution is modified to reduce resistance, then energy loss decreases, but solution stability may be compromised

Engineering Contradiction:

Improveelectrical resistanceVSAvoidelectrolytic solution stability

Core Design Contradiction:

Loss of energyVSStability of the object's composition

Solution Approach 1:

The patent applies local quality by introducing the phenyl isothiocyanate compound at specific local concentrations (0.01-10 wt%) within the electrolytic solution rather than uniformly changing the entire solution composition. This localized addition reduces electrical resistance in the critical electrode interface regions while maintaining the overall stability of the bulk electrolytic solution composition.

Inventive Principle:

Principle #3Local quality

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 achieves stable and continuous charge-discharge reactions, improving battery characteristics by maintaining discharge capacity and enhancing both normal and low-temperature retention rates.

Implementation Method 1

the phenyl isothiocyanate compound and the benzothiazole compound form a coating film on a surface of each of the positive electrode and the negative electrode

Methodology Applied

Scientific EffectAdsorption: Adsorption

Implementation Method 2

overvoltage of the negative electrode is reduced, so that precipitation of the electrode reactant in the negative electrode is suppressed

Methodology Applied

Scientific EffectElectrochemical reaction: Redox Reactions

Data Source

PatentUS20250105352A1Secondary battery-use electrolytic solution and secondary battery

Publication Date: 2025.03.27 MURATA MFG CO LTD

AI summary

A secondary battery includes a positive electrode, a negative electrode, and an electrolytic solution, and the electrolytic solution contains a phenyl isothiocyanate compound represented by Formula (1).