Synthesis of Co-Ni oxide microflowers as a superior anode for hybrid supercapacitors with ultralong cycle life

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• 作者：Ling-Yang Liu^a ; ^c ; Xu Zhang^c ; Hong-Xia Li^c ; Bao Liu^c ; Jun-Wei Lang^c ; Ling-Bin Kong^a ; ^b ; ^{konglb@lut.cn} ; Xing-Bin Yan^c ; ^{xbyan@licp.cas.cn}
• 关键词：Li-ion hybrid capacitor ; Energy storage device ; Co-precipitation method ; Cobalt nickel oxide ; APDC ; Long cycle life
• 刊名：Chinese Chemical Letters
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：28
• 期：2
• 页码：206-212
• 全文大小：1494 K
• 卷排序：28

文摘

Li-ion hybrid capacitors (LIHCs), composing of a lithium-ion battery (LIB) type anode and a supercapacitor (SC) type cathode, gained worldwide popularity due to harmonious integrating the virtues of high energy density of LIBs with high power density of SCs. Herein, nanoflakes composed microflower-like Co–Ni oxide (CoNiO) was successfully synthesized by a simple co-precipitation method. The atomic ratio of as-synthesized CoNiO is determined to be 1:3 through XRD and XPS analytical method. As a typical battery-type material, CoNiO and capacitor-type activated polyaniline-derived carbon (APDC) were used to assemble LIHCs as the anode and cathode materials, respectively. As a result, when an optimized mass ratio of CoNiO and APDC was 1:2, CoNiO//APDC LIHC could deliver a maximum energy density of 143 Wh kg−1 at a working voltage of 1–4 V. It is worth mentioning that the LIHC also exhibits excellent cycle stability with the capacitance retention of ∼78.2% after 15,000 cycles at a current density of 0.5 A g−1.