Sulfur-Modified Polyacrylonitrile High-Temperature Battery Performance

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Solution Overview

Problem

Non-aqueous electrolyte secondary batteries, such as lithium ion batteries, experience reduced electric power storage characteristics and increased self-discharge at high temperatures, particularly when using sulfur-modified polyacrylonitrile as an electrode active material.

Innovation Solution

A sulfur-modified polyacrylonitrile with a total sulfur content of 30-55 mass % and specific thermal desorption mass spectrometry characteristics, where the ratio of fragment ion intensities at m/z=32 and m/z=64 is optimized to improve charge-discharge capacity and reduce self-discharge at high temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If sulfur-modified polyacrylonitrile is used as an electrode active material, then charge-discharge capacity is improved, but self-discharge increases at high temperature

Engineering Contradiction:

Improvecharge-discharge capacityVSAvoidself-discharge

Core Design Contradiction:

PowerVSLoss of energy

Solution Approach 1:

The patent applies parameter changes by precisely controlling the sulfur content (30-55 mass %) and the thermal desorption mass spectrometry characteristics (E1/(E1+E2+E3) ratio less than 0.08) of the sulfur-modified polyacrylonitrile. This optimization of chemical composition parameters resolves the contradiction by achieving high charge-discharge capacity while suppressing self-discharge at elevated temperatures.

Inventive Principle:

Principle #35Parameter changes

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-modified polyacrylonitrile exhibits excellent electric power storage characteristics and high charge-discharge capacity even at high temperatures, reducing self-discharge and maintaining battery performance.

Implementation Method 1

thermal desorption mass spectrometry is an analysis method involving heating a sample in an ultra-high vacuum and analyzing a desorbed gas component with a mass spectrometer

Methodology Applied

Scientific EffectThermal desorption mass spectrometry:

Implementation Method 2

electron ionization method at a temperature increase rate of 60°C./min

Methodology Applied

Scientific EffectElectron ionization:

Data Source

PatentUS20230261193A1Sulfur-modified polyacrylonitrile, electrode active material containing same, electrode for secondary battery containing said electrode active material, method of manufacturing said electrode, and non-aqueous electrolyte secondary battery using said electrode

Publication Date: 2023.08.17 ADEKA CORP

AI summary

The present invention provides a sulfur-modified polyacrylonitrile, which has a total content of sulfur of from 30 mass % to 55 mass %, and has a value for the calculation formula (1) defined in Description of less than 0.08, an electrode active material containing the same, an electrode for a secondary battery including the electrode active material, a method of manufacturing the electrode, and a non-aqueous electrolyte secondary battery using the electrode.