Non-Lithium Battery Electrode Pillaring for Ion Diffusion
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Solution Overview
Problem
Current non-lithium metal ion batteries face limitations in intercalation extent and cycling stability due to the larger or more polarizing nature of non-lithium metal cations, which restricts their energy density and reversibility compared to lithium-ion batteries.
Innovation Solution
The introduction of insertion species into a composition of AxMyNz, followed by delamination and restacking with a pillaring agent, expands the interlayer spacing of electrode materials, facilitating the diffusion of non-lithium metal ions by controlling the interlayer distance, thereby enhancing intercalation kinetics and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If non-lithium metal ions (such as magnesium or sodium) are used as electrode materials, then volumetric specific capacity increases up to seven times higher than lithium-ion battery anodes, but intercalation extent and cycling stability are limited due to larger ionic radius and higher polarization strength
Solution Approach 1:
The patent applies local quality by creating a core-shell structure where the interior core region provides high volumetric capacity through multivalent metal intercalation, while the exterior shell region with different composition and structure provides stability and controls ion transport. This spatial differentiation of material properties resolves the contradiction between high capacity and cycling stability.
Solution Approach 2:
The patent employs composite materials by combining multivalent metal-containing compounds (providing high capacity) with lithium-ion battery cathode materials (providing stability) in a core-shell architecture. This composite approach allows the system to achieve both high volumetric specific capacity and practical cycling stability that neither material could provide alone.
2Ease of manufacture
If non-lithium metal ions are used, then earth abundance and cost decrease (magnesium and sodium are cheaply produced in huge amounts), but intercalation kinetics are slower due to larger ionic radius and stronger polarization
Solution Approach 1:
The patent applies parameter changes by modifying the shell region composition and structure to have higher lithium content and different crystallographic properties that facilitate faster ion transport. This changes the kinetic parameters of the electrode material, enabling multivalent metal ions to intercalate and deintercalate at practical rates despite their larger size and higher polarization.
Solution Approach 2:
The patent uses the lithium-ion battery cathode material shell as an intermediary that mediates the interaction between multivalent metal ions and the electrode structure. This shell acts as a facilitator that enables efficient ion transport pathways, overcoming the kinetic limitations imposed by the larger ionic radius and higher polarization of non-lithium metals.
3Use of energy by moving object
If multivalent metal-containing compounds are used as electrodes, then volumetric energy density increases, but structural transformation and capacity fade occur during charge-discharge cycles
Solution Approach 1:
The patent applies segmentation by dividing the electrode into distinct core and shell regions with different functions. The core segment contains the multivalent metal-containing compounds for high energy density, while the shell segment provides structural stability. This segmentation allows each region to optimize its properties without compromising the other, resolving the contradiction between energy density and structural stability.
Solution Approach 2:
The patent employs beforehand cushioning by designing the shell region to preemptively accommodate and buffer the structural stresses that occur during multivalent metal ion intercalation and deintercalation. This protective shell prevents structural transformation and capacity fade before they can propagate through the entire electrode material, maintaining stability during cycling.
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
This approach significantly increases the volumetric energy density and cycling stability of non-lithium metal ion batteries, making them suitable for high-energy applications like electric vehicles and distributed power sources, while maintaining safety and reducing material costs.
Implementation Method 1
The introduction of insertion species into a composition of AxMyNz, followed by delamination and restacking with a pillaring agent, expands the interlayer spacing of electrode materials
Implementation Method 2
facilitating the diffusion of non-lithium metal ions by controlling the interlayer distance
Data Source
AI summary
A method for configuring a non-lithium-intercalation electrode includes intercalating an insertion species between multiple layers of a stacked or layered electrode material. The method forms an electrode architecture with increased interlayer spacing for non-lithium metal ion migration. A laminate electrode material is constructed such that pillaring agents are intercalated between multiple layers of the stacked electrode material and installed in a battery.