Clathrate Alloy Anodes for High-Capacity Lithium Batteries
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current lithium-ion battery electrode materials, such as graphite anodes, have limited energy density and stability, necessitating the development of new materials that can reversibly react with lithium without compromising performance.
Innovation Solution
The use of clathrate alloy structures composed of silicon, germanium, and/or tin, specifically Type I and Type II clathrate alloys, which are synthesized through high-energy methods and configured into electrodes to enhance lithium intercalation and deintercalation capabilities, offering improved energy density and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphite anodes are used in lithium-ion batteries, then the batteries can achieve stable cycling performance, but the energy density is limited to 372 mAh/g
Solution Approach 1:
The patent employs composite materials by combining silicon, germanium, and/or tin atoms within clathrate cage structures formed by carbon atoms. This composite approach allows the anode to achieve higher theoretical capacities (up to 4200 mAh/g for Si46) compared to pure graphite (372 mAh/g), while the cage structure provides mechanical stability to maintain cycling performance.
2Quantity of substance
If replacement materials with higher capacity are sought to improve energy density, then the theoretical capacity increases, but the mechanical stability and performance reliability may be compromised
Solution Approach 1:
The patent applies local quality by creating distinct functional regions within the anode structure: the clathrate cages provide a stable framework that accommodates volume changes, while the guest atoms (Si, Ge, Sn) within the cages provide high lithium capacity. This local differentiation allows the material to simultaneously achieve high capacity and mechanical stability.
Solution Approach 2:
The clathrate cage structure acts as a flexible shell that can accommodate the volume expansion and contraction of the guest atoms during lithium intercalation and deintercalation. The cage structure undergoes volume changes of less than 50%, providing mechanical stability while allowing the high-capacity guest materials to function effectively.
3Quantity of substance
If elements that reversibly react with lithium are identified to improve capacity, then the energy density increases, but the selection is limited by the need to maintain anode performance
Solution Approach 1:
The clathrate cage structure serves multiple functions: it provides a stable framework, accommodates various guest atoms (Si, Ge, Sn, or combinations), and maintains structural integrity during lithium cycling. This universal structure allows different high-capacity materials to be incorporated while maintaining anode performance, greatly expanding material selection flexibility.
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 clathrate alloys demonstrate higher theoretical specific capacities and mechanical stability, with volume changes of less than 50% during lithium intercalation and deintercalation, leading to enhanced energy storage performance and durability.
Implementation Method 1
configured into electrodes to enhance lithium intercalation and deintercalation capabilities
Implementation Method 2
materials that can reversibly react with lithium
Data Source
AI summary
The present disclosure is directed at an electrode for a battery wherein the electrode comprises clathrate alloys of silicon, germanium or tin. In method form, the present disclosure is directed at methods of forming clathrate alloys of silicon, germanium or tin which methods lead to the formation of empty cage structures suitable for use as electrodes in rechargeable type batteries.