Nanoscale Ion Storage Materials for Enhanced Conductivity
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Solution Overview
Problem
Conventional ion storage materials, such as alkaline transition metal phosphates, exhibit low electronic conductivity, limited solid solution range, and poor rate capability, making them less than ideal for electrochemical applications.
Innovation Solution
Nanoscale ion storage materials with specific structural and compositional features, including high specific surface area, stable solid solutions, and controlled lattice parameters, are developed to enhance electronic conductivity and intercalation rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ion storage materials are used, then material stability is maintained, but electronic conductivity is low and rate capability is poor
Solution Approach 1:
The patent divides the ion storage material into nanoscale particles (1-100 nm diameter), segmenting the bulk material into numerous small units. This segmentation increases the surface area to volume ratio, providing more pathways for electron transport and ion intercalation, thereby simultaneously improving electronic conductivity and rate capability while maintaining structural stability through the controlled nanoscale dimensions.
Solution Approach 2:
The patent changes the critical parameter of particle size from micrometer scale to nanometer scale (1-100 nm). This parameter change fundamentally alters the material's electronic and ionic transport properties, enabling enhanced electronic conductivity through quantum size effects and improved rate capability through reduced diffusion path lengths, while maintaining phase stability through controlled nanoscale confinement.
2Productivity
If nanoscale materials are used, then rate capability and electronic conductivity improve, but manufacturing precision and structural control become more difficult
Solution Approach 1:
The patent utilizes phase transition control during synthesis to achieve the desired nanoscale structure. By controlling the phase transformation from bulk to nanoscale during synthesis, the method achieves precise lattice parameter control and crystalline structure maintenance, ensuring that the nanoscale material retains the stable olivine or NASICON phase structure while achieving the target particle size and surface area.
3Stability of the object's composition
If conventional phase structures are used, then structural stability is maintained, but solid solution range is limited
Solution Approach 1:
The patent changes the compositional parameter by introducing non-stoichiometric ratios and dopant elements into the nanoscale structure. This enables the material to accommodate a wider range of lithium concentrations and transition metal compositions within the same phase structure, extending the solid solution range while maintaining phase stability through the nanoscale confinement effect that suppresses phase separation.
Data Source
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Figure 2A~2B
Figure 2C~2F
AI summary
Nanoscale ion storage materials are provided that exhibit unique properties measurably distinct from their larger scale counterparts. For example, the nanoscale materials can exhibit increased electronic conductivity, improved electromechanical stability, increased rate of intercalation, and/or an extended range of solid solution. Useful nanoscale materials include alkaline transition metal phosphates, such as LiMPO4, where M is one or more transition metals. The nanoscale ion storage materials are useful for producing devices such as high energy and high power storage batteries, battery-capacitor hybrid devices, and high rate electrochromic devices.