Li{sub x}Cu{sub 6}Sn{sub 5} (0<13) : an intermetallic insertion electrode for rechargeable lithium batteries.
It has been discovered that lithium can be inserted into the intermetallic compound Cu{sub 6}Sn{sub 5} in a two-phase reaction to yield the product Li{sub x}Cu{sub 6}Sn{sub 5} (x{approx}13). This finding has important implications for designing new intermetallic insertion electrodes (anodes) for rechargeable lithium batteries. The theoretical capacity of Li{sub x}Cu{sub 6}Sn{sub 5} derived from the eta-phase, {eta}-Cu{sub 6}Sn{sub 5}, with a NiAs-type structure is 358 mAh/g for x{sub max}=13, which corresponds to a fully lithiated composition Li{sub 2.17}CuSn{sub 0.83}; this capacity is close to the theoretical capacity of lithiated graphite LiC{sub 6} (372 mAh/g). The reaction occurs at approximately 0.4 V vs. lithium metal. The best cycling efficiency is obtained when the end voltage is restricted to 200 mV above the potential of lithium metal. A mechanism is proposed for the insertion of lithium into {eta}-Cu{sub 6}Sn{sub 5}.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); EE
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 942483
- Report Number(s):
- ANL/CMT/JA-31918; TRN: US200916%%550
- Journal Information:
- Electrochem. Solid State Lett., Vol. 2, Issue 7 ; Jul. 1999; ISSN 1099-0062
- Country of Publication:
- United States
- Language:
- ENGLISH
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