Amorphous Nanoscale Ion Storage Materials
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Solution Overview
Problem
Conventional ion storage materials, such as lithium transition metal phosphates, exhibit low electronic conductivity and limited solid solution range, which hinders their performance in electrochemical applications like batteries, and existing nanoscale materials have not significantly improved these properties.
Innovation Solution
Development of amorphous or partially amorphous nanoscale lithium transition metal phosphate materials with specific surface areas and compositions that can be rendered disordered or amorphous through electrochemical intercalation or de-intercalation, enhancing their alkali ion storage capacity and rate capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional crystalline ion storage materials are used, then structural stability is maintained, but electronic conductivity and alkali ion conductivity remain low
Solution Approach 1:
The patent changes the structural parameter from crystalline to amorphous state, which fundamentally alters the material properties. The amorphous structure eliminates long-range atomic order while maintaining short-range order, enabling higher ionic and electronic conductivity without sacrificing structural stability during electrochemical cycling.
Solution Approach 2:
The patent creates composite materials with controlled amorphous-crystalline ratios, combining the structural stability of crystalline phases with the high conductivity of amorphous phases. This composite approach allows optimization of both stability and conductivity properties simultaneously.
2Productivity
If nanoscale particle size is reduced, then surface area increases improving reaction kinetics, but mechanical stress resistance decreases
Solution Approach 1:
The patent changes the structural state parameter to amorphous, which provides superior mechanical flexibility compared to crystalline structures. The amorphous matrix can accommodate volume changes and mechanical stresses more effectively, maintaining integrity at nanoscale dimensions while enabling fast reaction kinetics.
Solution Approach 2:
The patent creates local structural variations within the amorphous material, with different regions having varying degrees of short-range order. This local quality variation allows different parts of the material to fulfill different functions: some regions provide mechanical stability while others facilitate rapid ion transport.
3Power
If amorphous structure is adopted, then electronic conductivity and solid solution range increase, but manufacturing precision becomes more difficult to control
Solution Approach 1:
The patent employs preliminary action by carefully controlling the synthesis conditions (temperature, time, atmosphere, precursor ratios) to guide the formation of amorphous structures with desired properties. Pre-treatment of precursors and controlled cooling rates are used to achieve consistent amorphous phases with reproducible characteristics.
Solution Approach 2:
The patent utilizes feedback mechanisms through characterization techniques (XRD, TEM, BET surface area measurement) to monitor the amorphous structure formation and adjust synthesis parameters accordingly. This feedback loop ensures consistent production of amorphous materials with controlled properties and desired amorphous-crystalline ratios.
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 amorphous nanoscale materials demonstrate improved high energy and high power storage capabilities, with increased electronic conductivity and wider lithium solid solution ranges, mitigating mechanical stresses and improving battery performance.
Implementation Method 1
certain such materials can be rendered disordered or amorphous upon electrochemical intercalation or de-intercalation by lithium
Implementation Method 2
ion storage materials are widely employed in storage batteries and other electrochemical devices
Data Source
AI summary
Amorphous or partially amorphous nanoscale ion storage materials are provided. For example, lithium transition metal phosphate storage compounds are nanoscale and amorphous or partially amorphous in an as-prepared state, or become amorphous or partially amorphous upon electrochemical intercalation or de-intercalation by lithium. These nanoscale ion storage materials are useful for producing devices such as high energy and high power storage batteries.