Magnesium Battery Active Material Antimony Intermetallics
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Solution Overview
Problem
Current rechargeable batteries, such as lithium-ion batteries, face limitations in achieving high capacity density due to the lack of effective cathode or anode active materials that can fully utilize the high capacity density potential of magnesium ions, which transfer two electrical charges.
Innovation Solution
The development of magnesium batteries utilizing active materials like antimony and its inter-metallic compounds, such as Mg3Sb2, or alloys like Bi0.55Sb0.45, integrated with a magnesium compound electrolyte, enhancing the electrodes' performance and capacity density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional lithium-ion battery materials are used, then the battery structure is well-established and manufacturable, but the capacity density is limited due to single-electron transfer of lithium ions
Solution Approach 1:
The patent changes the fundamental electrochemical parameter from single-electron transfer (lithium-ion) to two-electron transfer (magnesium-ion), thereby doubling the theoretical capacity density. This parameter change is achieved by substituting lithium-based materials with magnesium-based electrolytes and corresponding electrode materials that accommodate Mg2+ ions.
Solution Approach 2:
The patent employs composite electrode materials consisting of intermetallic compounds (such as Mg3Sb2, Mg3Bi2) combined with conventional battery materials. These composite structures enable effective magnesium ion insertion and extraction while maintaining structural stability, thus achieving high capacity density with practical manufacturability.
2Quantity of substance
If magnesium ion batteries are developed to utilize two-electron transfer capability, then capacity density is improved, but suitable active materials are lacking
Solution Approach 1:
The patent identifies and utilizes intermetallic compounds with specific crystal structures (such as Mg3Sb2, Mg3Bi2) that have proven electrochemical stability and reversibility for magnesium ion insertion/extraction. These materials represent a parameter change from conventional lithium-based active materials to magnesium-compatible intermetallics.
Solution Approach 2:
The patent employs abundant earth elements (magnesium, antimony, bismuth) to create active materials that are both high-performance and cost-effective. These materials replace rare lithium-based compounds with more abundant alternatives, improving both reliability and manufacturability.
3Reliability
If intermetallic compounds like Mg3Sb2 are used as active material, then electrochemical performance is improved, but material complexity increases
Solution Approach 1:
The patent uses intermetallic compounds (Mg3Sb2, Mg3Bi2) as active materials that combine multiple elements in specific stoichiometric ratios. These composite materials provide both the necessary electrochemical performance for magnesium ion batteries and a defined crystal structure that facilitates reversible ion insertion/extraction.
Solution Approach 2:
The patent utilizes the specific local crystal structure and chemical environment within the intermetallic compounds to create favorable sites for magnesium ion insertion and extraction. The localized atomic arrangement in these intermetallics provides optimal electronic and structural properties for high-performance electrochemistry.
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
These improved active materials result in a rechargeable magnesium battery system with higher energy density and capacity, surpassing conventional lithium-ion batteries by effectively utilizing the two-electron transfer capability of magnesium ions, leading to improved electrochemical performance and extended cycle life.
Implementation Method 1
A magnesium ion in a magnesium or magnesium ion battery carries two electrical charges
Implementation Method 2
The active material includes an inter-metallic compound of magnesium and antimony
Data Source
AI summary
A magnesium battery includes a first electrode including an active material and a second electrode. An electrolyte is disposed between the first electrode and the second electrode. The electrolyte includes a magnesium compound. The active material includes an inter-metallic compound of magnesium and antimony. The active material also includes antimony or an alloy of bismuth and antimony.