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Intermetallic M-Sn5 (M=Fe, Cu, Co, Ni) Compounds

Brookhaven National Laboratory

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Technology Marketing Summary

Among electrode materials for lithium ion batteries, tin offers a high theoretical capacity about 2.5 times that of graphite by weight. Unfortunately, when lithium alloys with tin the matrix undergoes a very large volume change. This change in volume results in a loss of capacity over a few charge-discharge cycles. By adding a transition metal to the tin, this volume change can be mitigated. The novel phase of FeSn5 or CoSn5 exhibits a capacity nearly twice that of FeSn2, the previous champion intermetallic.


Using a modified polyol wet-chemistry method the inventors prepared nanospheres of the new phases, which have tetragonal lattices in the P4/mcc space group. The capacity of FeSn5 is nearly twice that of FeSn2. Both FeSn5 and CoSn5 have a large number of vacancies on the M site, approximately 25%, leading to quasi-one-dimensional behavior. FeSn5 is also superparamagnetic, implying that the nanoparticles include at least one component that orders magnetically at or above room temperature.


FeSn5and CoSn5 offer very high capacity for lithium ion batteries.

Applications and Industries

These materials can be used in lithium ion batteries.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 9,490,486
Method for removing strongly adsorbed surfactants and capping agents from metal to facilitate their catalytic applications
A method of synthesizing activated electrocatalyst, preferably having a morphology of a nanostructure, is disclosed. The method includes safely and efficiently removing surfactants and capping agents from the surface of the metal structures. With regard to metal nanoparticles, the method includes synthesis of nanoparticle(s) in polar or non-polar solution with surfactants or capping agents and subsequent activation by CO-adsorption-induced surfactant/capping agent desorption and electrochemical oxidation. The method produces activated macroparticle or nanoparticle electrocatalysts without damaging the surface of the electrocatalyst that includes breaking, increasing particle thickness or increasing the number of low coordination sites.
Brookhaven National Laboratory 11/08/2016
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
BSA 11-12PrototypeAvailable01/09/201401/09/2014

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To: Avijit Sen<>