Synthesis, characterization, and lithium battery applications of molybdenum oxysulfides

Journal Article · Wed Sep 01 04:00:00 EDT 1993 · Chemistry of Materials; (United States)

DOI:https://doi.org/10.1021/cm00033a009· OSTI ID:5099704

Abraham, K M; Pasquariello, D M ^[1]

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1. EIC Labs. Inc., Norwood, MA (United States)

Molybdenum oxysulfides, MoO[sub x]S[sub y], obtained by thermal decomposition of (NH[sub 4])[sub 2]MoO[sub 2]S[sub 2], have been identified as Li insertion positive electrodes for rechargeable Li batteries. The compositions of the oxysulfides and their discharge capacity and rechargeability in Li cells were influenced by the temperature at which they were formed from (NH[sub 4])[sub 2]MoO[sub 2]S[sub 2]. Thermolysis of the latter in the 200-380[degrees]C range appeared to occur by a solid-state polymerization reaction, wherein the MoO[sub x]S[sub y] formed at different temperatures can be viewed as polymers with different chain lengths. MoO[sub x]S[sub y] prepared at 200, 300, and 380[degrees]C and in a two-step 200/380[degrees]C thermolysis, respectively, exhibited first discharge capacity, in Li cells, equivalent to the incorporation of 2.70, 2.80, 1.90, and 1.30 Li per molybdenum. These capacities translated into quasi-theoretical specific energies from 290 to 685 W h/kg for the Li cells. A fraction of the capacity in the first discharge of Li/MoO[sub x]S[sub y] cells was irreversible, and it is largely attributed to a phase change accompanying Li insertion into the material. MoO[sub x]S[sub y] obtained by the decomposition of an intimate 1:1 mixture of (NH[sub 4])[sub 2]MoO[sub 4] and (NH[sub 4])[sub 2]MoS[sub 4] at 380[degrees]C exhibited electrochemical behavior reminiscent of the Mo-oxysulfide obtained by decomposition of (NH[sub 4])[sub 2]MoO[sub 2]S[sub 2] at the same temperature. 21 refs., 14 figs., 5 tabs.

• OSTI ID: 5099704
• Journal Information: Chemistry of Materials; (United States), Journal Name: Chemistry of Materials; (United States) Vol. 5:9; ISSN CMATEX; ISSN 0897-4756
• Country of Publication: United States
• Language: English

Related Subjects

25 ENERGY STORAGE
250903* -- Energy Storage-- Batteries-- Materials
Components
& Auxiliaries
ALKALI METALS
BATTERY CHARGING
CHEMICAL PREPARATION
ELECTROLYTIC CELLS
ELEMENTS
LITHIUM
METALS
MOLYBDENUM COMPOUNDS
OXYGEN COMPOUNDS
OXYSULFIDES
REFRACTORY METAL COMPOUNDS
SULFUR COMPOUNDS
SYNTHESIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENT COMPOUNDS