Sulfur-Modified Battery Material for High-Capacity Safer Electrodes
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Solution Overview
Problem
Existing sulfur-containing materials do not effectively increase discharge capacity in batteries.
Innovation Solution
A sulfur-containing material with a sulfur-modified compound, having a total sulfur content of 50 mass % or more and a specific peak intensity ratio (A/B) of 1.5 or less in powder X-ray diffraction, is used to enhance discharge capacity and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional sulfur-containing materials are used as active material, then the battery can operate, but the discharge capacity is insufficient
Solution Approach 1:
The invention changes the chemical composition parameters by incorporating sulfur-modified compounds with specific sulfur content (5-50 mass%) and controlling the ratio of sulfur-modified compound to sulfur powder (1:4 to 4:1). This parameter optimization resolves the contradiction by achieving both high discharge capacity (through increased sulfur content) and good cycle characteristics (through the moderating effect of the sulfur-modified compound)
Solution Approach 2:
The invention creates a composite material system combining sulfur-modified compounds (such as sulfur-modified polyacrylonitrile, sulfur-modified carboxymethyl cellulose, or sulfur-modified starch) with sulfur powder. This composite approach allows the sulfur-modified compound to enhance discharge capacity while simultaneously improving cycle characteristics, resolving the contradiction between these two performance parameters
2Quantity of substance
If sulfur content is increased to improve discharge capacity, then more energy can be stored, but flammability and safety issues worsen
Solution Approach 1:
The invention converts the harmful flammability of sulfur into a beneficial property by using sulfur-modified compounds that can control the release and reaction of sulfur. The sulfur-modified compound acts as a safety mechanism that prevents uncontrolled combustion while still allowing electrochemical reactions, thus resolving the contradiction between high sulfur content and flammability
3Quantity of substance
If sulfur-modified compound is added to increase discharge capacity, then battery performance improves, but material complexity increases
Solution Approach 1:
The invention simplifies the complex material system by defining specific parameter ranges: sulfur-modified compound content (5-50 mass%), sulfur powder content (50-95 mass%), and their ratio (1:4 to 4:1). These parameter specifications resolve the contradiction by providing clear guidance for achieving high discharge capacity without excessive complexity
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 material significantly increases discharge capacity and improves cycle characteristics while enhancing battery safety through improved reactivity and reduced flammability.
Implementation Method 1
measurement values of powder X-ray diffraction using a CuKα ray satisfy a predetermined condition
Data Source
AI summary
Provided is a sulfur-containing material including a sulfur-modified compound, wherein the sulfur-containing material has a total content of sulfur of 50 mass % or more, and a ratio (A/B) of a maximum peak intensity (A) at a diffraction angle (2θ) that falls within a range of from 23.0° to 23.4° to a maximum peak intensity (B) at a diffraction angle (2θ) that falls within a range of from 24.8° to 25.2°, the ratio being obtained in powder X-ray diffraction using a CuKα ray, of 1.5 or less (A/B≤1.5).