Effect on Performance of Composition of Li-Ion Carbon Anodes Derived from PMAN/DVB Copolymers

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The effects on electrochemical performance of the nitrogen content of disordered carbons derived from polymethacryonitrile (PMAN)-divinylbenzene (DVB) copolymers were examined in galvanostatic cycling tests between 2 V and 0.01 V vs. Li/Li+ in lM LiPF<sub>6</sub>/ethylene carbonate (EC)-dimethyl carbonate (DMC). The first-cycle reversible capacities and coulombic efficiencies increased with increase in the level of nitrogen for samples prepared at 700&deg;C. However, the degree of fade also increased. Similar tests were performed on materials that were additionally heated at 1,000&deg; and 1,300&deg;C for five hours. Loss of nitrogen, oxygen, and hydrogen occurred under these conditions, with none remaining at the highest temperature ... continued below

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7 Pages

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Even, William R. & Guidotti, Ronald A. May 14, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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The effects on electrochemical performance of the nitrogen content of disordered carbons derived from polymethacryonitrile (PMAN)-divinylbenzene (DVB) copolymers were examined in galvanostatic cycling tests between 2 V and 0.01 V vs. Li/Li+ in lM LiPF<sub>6</sub>/ethylene carbonate (EC)-dimethyl carbonate (DMC). The first-cycle reversible capacities and coulombic efficiencies increased with increase in the level of nitrogen for samples prepared at 700&deg;C. However, the degree of fade also increased. Similar tests were performed on materials that were additionally heated at 1,000&deg; and 1,300&deg;C for five hours. Loss of nitrogen, oxygen, and hydrogen occurred under these conditions, with none remaining at the highest temperature in all cases but one. The pyrolysis temperature dominated the electrochemical performance for these samples, with lower reversible and irreversible capacities for the first intercalation cycle as the pyrolysis temperature was increased. Fade was reduced and coulombic efficiencies also improved with increase in temperate. The large irreversible capacities and high fade of these materials makes them unsuitable for use in Li-ion cells.

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7 Pages

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  • Spring Meeting of the Materials Research Society; San Francisco, CA; 04/05-08/1999

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  • Other: DE00007240
  • Report No.: SAND99-1172C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 7240
  • Archival Resource Key: ark:/67531/metadc709908

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  • May 14, 1999

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 23, 2016, 5:18 p.m.

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Even, William R. & Guidotti, Ronald A. Effect on Performance of Composition of Li-Ion Carbon Anodes Derived from PMAN/DVB Copolymers, article, May 14, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc709908/: accessed September 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.