Title: Preparation of intercalated chalcogenides

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Abstract: Ions are intercalated in chalcogenides by flowing a current through a system comprising a cathode which contains the chalcogenides (e.g., TaS.sub.2 is a suitable chalcogenide), an anode containing electronically conductive material which is not a source of the intercalating ions (a suitable anode material would be gold) and an electrolyte comprising or containing at least one ionically conducting material which will electrochemically release ions of the species which are to be intercalated in the chalcogenide (e.g., dilute HCl, in which case hydrogen ions would be intercalated in the chalcogenide). The voltage is applied at a level sufficient to permit electrochemical decomposition of the electrolyte to thereby release the ions to be intercalated into the chalcogenide. Alternatively, the anode may act as the source of the intercalating ions and the electrolyte would comprise or contain at least one compound of the same species as that of the ions to be intercalated (e.g., a suitable anode would be lithium metal and a suitable electrolyte would be LiI in propylene carbonate). In this alternate method, an electrical circuit is provided within the system and the voltage within the system is controlled such that ions are released from the anode to intercalate into the chalcogenide.


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