Halogen-Oxygen Cathode Material for Faster Ion Transport
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Solution Overview
Problem
Existing cathode materials for alkali metal ion batteries face challenges in achieving both high capacity and good cycling performance, with surface coatings hindering lithium/sodium ion migration and diffusion, leading to poor rate performance and stability.
Innovation Solution
A one-step ball milling method is used to convert halides into halogen-oxygen compounds through corrosion and solid solution reactions, creating cathode materials with defects and vacancies that alleviate mechanical strain and improve ionic and electronic conduction rates, enhancing cycling stability and capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surface coating is applied to cathode materials, then electrochemical performance is improved, but lithium/sodium ion migration and diffusion are hindered, resulting in poor rate performance
Solution Approach 1:
The patent changes the chemical composition parameters of the coating layer by incorporating halogen elements (F, Cl, Br, I) in specific concentrations (0.1-5.0 wt%) to create a coating that enables ion diffusion while providing protective functions. This compositional parameter change resolves the contradiction between protection and ion transport.
Solution Approach 2:
The patent creates a composite coating structure combining halogen-containing compounds with oxygen-containing groups on the cathode material surface. This composite material approach allows simultaneous achievement of protective functions and ion transport channels, resolving the contradiction between electrochemical performance improvement and ion diffusion hindrance.
2Ease of manufacture
If conventional cathode materials are used, then production cost is reduced, but both capacity performance and cycling performance cannot be satisfied simultaneously
Solution Approach 1:
The patent modifies the surface chemical composition of conventional low-cost cathode materials by introducing halogen elements and oxygen-containing groups through a simple one-step ball milling method. This parameter change enables low-cost materials to achieve high capacity (120-150 mAh g⁻¹) and excellent cycling performance (95% retention after 500 cycles) simultaneously.
Solution Approach 2:
The patent replaces complex multi-step chemical vapor deposition or atomic layer deposition processes with a simple mechanical ball milling method for surface modification. This substitution maintains low production costs while achieving the desired surface composition and performance characteristics.
3Device complexity
If simple one-step ball milling method is used, then production cost is reduced and manufacturing complexity is simplified, but material performance may be compromised
Solution Approach 1:
The patent merges multiple functions (surface coating, doping, and morphology control) into a single one-step ball milling process. By combining halide addition, oxygen-containing group introduction, and surface restructuring in one operation, the method simplifies manufacturing while achieving comprehensive performance improvement with capacity of 120-150 mAh g⁻¹ and 95% retention after 500 cycles.
Solution Approach 2:
The patent optimizes key parameters of the ball milling process including ball-to-powder ratio (3:1 to 5:1), milling time (2-24 hours), and halide addition amount (0.1-5.0 wt%) to achieve the desired surface composition and material performance through this simplified single-step method.
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 method results in cathode materials with improved cycling stability, high ionic and electronic conduction rates, and thermal stability, addressing the limitations of traditional cathode materials by facilitating lithium/sodium storage and reducing production costs.
Implementation Method 1
converting the halide into the halogen-oxygen compound through corrosion and a solid solution reaction during a ball milling process
Implementation Method 2
converting the halide into the halogen-oxygen compound through corrosion and a solid solution reaction during a ball milling process
Implementation Method 3
improve ionic and electronic conduction rates
Implementation Method 4
improve ionic and electronic conduction rates
Data Source
AI summary
The present disclosure discloses a cathode material containing a halogen-oxygen compound, a method for preparing the same, and a cathode plate. The method includes the steps: ball milling at least one crystalline phase cathode material and at least one halide, and converting the halide into the halogen-oxygen compound through corrosion and a solid solution reaction during a ball milling process, so as to obtain the cathode material containing the halogen-oxygen compound. The cathode material provided by the present disclosure has a high ionic conduction rate and a low coefficient of expansion, as well as high capacity and good cycling performance.