Effects of Li-doped NiO on the charge?discharge properties of LiF?NiO composites used as cathode materials for Li-ion batteries
Effects of Li-doped NiO on the charge?discharge properties of LiF?NiO composites used as cathode materials for Li-ion batteries
复制标题
Li掺杂NiO对锂离子电池正极材料LiF?NiO复合材料充放电性能的影响
DOI：
10.1007/s10800-017-1104-z
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发表时间：
2017
影响因子：
2.9
通讯作者：
Kobayashi Kenkichiro
中科院分区：
文献类型：
--
作者：
Tomita Yasumasa;Kimura Noritaka;Nasu Hiromasa;Izumi Yusuke;Arai Juichi;Yamane Yohei;Yamada Koji;Kohno Yoshiumi;Kobayashi Kenkichiro
摘要 LiF-NiO 复合材料是通过机械研磨 LiF 和锂掺杂 NiO (d_NiO) 72 小时合成的。 Li-d_NiO是由Li2CO3和NiO的混合物经煅烧制备的。 NiO 的 X 射线衍射峰因掺杂和研磨过程而发生移动，而 LiF 的 X 射线衍射峰在研磨后消失。 Rietveld分析表明，球磨得到的复合材料形成固溶体，其中的Li+和Ni2+离子是无序的。单独研磨的 LiF 和 Li-d_NiO 样品没有表现出明显的放电容量，而复合材料则表现出较大的值。使用未掺杂的 NiO 未经球磨形成的复合材料在 0.05 C、2.0 至 5.0 V 之间的放电容量为 144 mA h g−1，而 LiF 和 20% Li-d_NiO 的复合材料的放电容量为 247 mA h g−1。复合材料的倍率性能随着Li含量的增加而增加，LiF-Li-d_NiO (20%)在1 C、电压为2.0-4.8 V时的放电容量为146 mA h g−1。图解LiF和Li(20%)掺杂NiO复合材料的放电容量为247 mAh g−1。
AbstractLiF–NiO composites are synthesized by the mechanical milling of LiF and Li-doped NiO (d_NiO) for 72 h. Li-d_NiO is prepared by the calcination of a mixture of Li2CO3and NiO. The X-ray diffraction peaks of NiO are shifted by the doping and milling processes, while those of LiF disappear after milling. Rietveld analysis shows that the composites obtained by milling form solid solutions and that the Li+and Ni2+ions in them are disordered. LiF and Li-d_NiO samples milled individually do not exhibit a noticeable discharge capacity, while the composites show large values. The composite formed using undoped NiO without ball-milling shows a discharge capacity of 144 mA h g−1at 0.05 C between 2.0 and 5.0 V, while the composite of LiF and 20% Li-d_NiO exhibits a discharge capacity of 247 mA h g−1. The rate capabilities of the composites increase with the Li content, and the discharge capacity of the LiF–Li-d_NiO (20%) is 146 mA h g−1at 1 C for voltages of 2.0–4.8 V.Graphical AbstractDischarge capacity of composite of LiF and Li(20%)-doped NiO is 247 mAh g−1.