O3/P2 Layered Oxide Composition for Stable Sodium-Ion Capacity
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Solution Overview
Problem
Existing sodium-ion battery technologies face challenges in achieving optimal electrochemical performance and phase stability due to the limited control over O3 and P2 phase structures in layered oxide materials, which affects charge capacity and rate capability.
Innovation Solution
The development of O3/P2 mixed-phase sodium-containing doped layered oxide materials with tailored phase ratios, achieved by controlling the reaction conditions such as heating temperature and duration, to enhance specific rate capability and discharge energies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to prepare layered oxide materials, then the materials can be obtained, but the control over O3 and P2 phase structures is limited, affecting electrochemical performance
Solution Approach 1:
The patent applies parameter changes by systematically varying synthesis conditions including heating temperature (500-900°C), heating duration (0.5-10 hours), and sodium content (x=0.5-1.05) to control the O3/P2 phase ratio. This enables precise control over phase structure while maintaining electrochemical performance, resolving the contradiction between manufacturing precision and reliability
Solution Approach 2:
The patent creates composite materials by intentionally forming mixed-phase structures (O3/P2) with controlled phase ratios rather than seeking single-phase materials. This composite approach leverages the advantages of both O3 and P2 phases, achieving superior electrochemical performance while maintaining structural control
2Quantity of substance
If single-phase materials are used, then the structure is simple, but the charge capacity and rate capability are limited
Solution Approach 1:
The patent employs composite materials by creating mixed-phase O3/P2 structures where the O3 phase contributes to high charge capacity and the P2 phase enhances rate capability. This composite structure achieves superior electrochemical performance compared to single-phase materials while maintaining controlled complexity through defined phase ratios
Solution Approach 2:
The patent applies local quality by allowing different phases (O3 and P2) to coexist in specific proportions within the same material structure. Each phase provides localized functional advantages - O3 regions provide high capacity while P2 regions provide fast kinetics, achieving overall superior performance
3Manufacturing precision
If prolonged heating is applied to control phase ratio, then the phase structure can be optimized, but the synthesis time increases
Solution Approach 1:
The patent applies parameter changes by optimizing the heating temperature range (500-900°C) and duration (0.5-10 hours) to achieve desired phase ratios. Higher temperatures and longer durations favor O3 phase formation, while lower temperatures and shorter durations preserve P2 phase, enabling control over phase composition without excessive synthesis time
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 O3/P2 mixed-phase materials exhibit superior electrochemical performance, particularly as electrode active materials, offering improved charge capacity and cycle life in sodium-ion batteries.
Implementation Method 1
heating the resulting mixture at a temperature of at least 500° C. to yield the O3/P2 mixed-phase sodium-containing doped layered oxide material
Implementation Method 2
forming a mixture of precursor materials to provide the metal atoms in the stoichiometric ratios that are present in the O3/P2 mixed-phase sodium-containing doped layered oxide material; and heating the resulting mixture
Data Source
AI summary
The invention relates to O3/P2 mixed-phase sodium-containing doped layered oxide materials which comprise a mixture of a first phase with an O3-type structure and a second phase with a P2-type structure; wherein the O3:P2 mixed-phase sodium-containing doped layered oxide material has the general formula: NaaAbM1c M2 M3eM4f M5 O2±δ. The invention also provides a process for making such O3/P2 mixed-phase sodium-containing doped layered oxide materials, and use applications therefor.