Effect of oxygen contents in graphene like graphite anodes on their capacity for lithium ion battery

JOURNAL OF POWER SOURCES

卷:396

Article

Matsuo, Yoshiaki¹  Taninaka, Junichi¹  Hashiguchi, Katsuki¹  Sasaki, Toshiyuki^1,3  Cheng, Qian²  Okamoto, Yasuharu²  Tamura, Noriyuki^2,4 

[1] Univ Hyogo, Grad Sch Engn, Dept Appl Chem, 2167 Shosha, Himeji, Hyogo 6712280, Japan

[2] NEC Corp Ltd, IoT Device Lab, 34 Miyukigaoka, Tsukuba, Ibaraki 3058501, Japan

[3] Yokohama City Univ, Grad Sch Nanobiosci, Dept Mat Syst Sci, Kanazawa Ku, 22-2 Seto, Yokohama, Kanagawa 2360027, Japan

[4] Natl Inst Mat Sci, Res & Serv Div Mat Data & Integrated Syst, 1-2-1 Sengen, Tsukuba, Ibaraki 3050047, Japan

关键词: Graphene like graphite;    Lithium ion battery;    Anode;    Oxygen;   

DOI  :  10.1016/j.jpowsour.2018.06.022

来源: Elsevier

【 摘 要 】

Graphene like graphite (GLG) samples containing various amounts of oxygen are prepared from the thermal reduction of graphite oxide (GO) and are used as anodes of lithium ion battery. The oxygen/carbon (O/C) ratios in GLG varied from 0 to 0.08, depending on the thermal reduction temperature, oxygen gas pressure during heat treatment and degree of oxidation of the starting GO. The cell voltage during discharge almost linearly increases below 1 V independent of the oxygen contents in them. The discharge capacity of GLG above 1 V increases with the increase in the oxygen content with a slope of lithium/oxygen ratio of 3 at lower O/C ratios. Then the slope becomes smaller and the discharge capacity reaches 673mAhg(-1) for GLG with O/C = 0.08. When GLG is treated with hydrogen gas, considerable amounts of oxygen atoms are substituted by hydrogen ones. The discharge capacity of the resulting GLG samples is larger than that expected form their oxygen contents and coulombic efficiency is slightly improved up to 59%. Introduction of oxygen atoms within carbon layers results in the large increase in the interlayer spacing during charging, which leads to accommodation of large amounts of lithium ions.

【 授权许可】

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