Electrochemical characteristics of lithium-excess cathode material (Li1+xNi0.9Co0.05Ti0.05O2) for lithium-ion batteries

Hyoung Shin Ko; Hyun Woo Park; Geun Joong Kim; Jong Dae Lee

Korean Journal of Chemical Engineering, Vol.36, No.4, 620-624, April, 2019

DOI10.1007/s11814-019-0248-4 Export Citation

Electrochemical characteristics of lithium-excess cathode material (Li1+xNi0.9Co0.05Ti0.05O2) for lithium-ion batteries

Hyoung Shin Ko, Hyun Woo Park¹, Geun Joong Kim¹, and Jong Dae Lee^{1, †}

New Material R&D Center, Huayou New Energy Technology Co., Ltd., No. 18, Wuzhen E. Rd., Economic Development Zone of Tonxiang, Zhejiang Province, 314500, China
¹Department of Chemical Engineering, Chungbuk National University, 1 Chungdaero, Seowongu, Cheongju, Chungbuk 28644, Korea

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A Ni0.9Co0.05Ti0.05(OH)2 precursor was synthesized with the concentration gradient method. To overcome the Li-ion shortage the problem due to the formation of a solid electrolyte interphase (SEI) layer during the initial charge/discharge process in the cathode material, lithium-excess Li1+xNi0.9Co0.05Ti0.05O2 (0≤x≤0.07) cathode materials were investigated by physical and electrochemical analyses. The physical properties of the lithium-excess cathode materials were analyzed using FE-SEM and XRD. A coin type half-cell was fabricated with the electrolyte of 1M LiPF6 dissolved in organic solvents (EC :EMC=1 : 2 vol%). The electrochemical performances were analyzed by the initial charge/discharge efficiency, cycle stability, rate performance and electrochemical impedance spectroscopy (EIS). The initial charge capacity of the cathode material was excellent at about 199.8-201.7mAh/g when the Li/Metal ratio was 1.03-1.07. Additionally, the efficiency of the 6.0 C/0.1 C was 79.2-79.9%. When the Li/Metal ratio was 1.05, the capacity retention showed the highest stability of 97.8% after 50 cycles.

Keywords:Lithium-excess;Li/Metal Ratio;Li-ion Shortage;SEI Layer;Cathode Material

[References]

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Xie H, Hu G, Du K, Peng Z, Cao Y, J. Alloy. Compd., 666, 84 (2016)
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Ko HS, Park HW, Lee JD, Korean Chem. Eng. Res., 56(5), 718 (2018)
Yoon CS, Choi MH, Lim BB, Lee EJ, Sun YK, J. Electrochem. Soc., 162(14), A2483 (2015)
Levi MD, Salitra G, Markovsky B, Teller H, Aurbach D, Heider U, Heider L, J. Electrochem. Soc., 146(4), 1279 (1999)
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[3] Cao Q, Zhang HP, Wang GJ, Xia Q, Wu YP, Wu HQ, Electrochem. Commun., 9, 1228 (2007)

[4] Ebner W, Fouchard D, Xie L, Solid State Ion., 69(3-4), 238 (1994)

[5] Rossen E, Jones CDW, Dahn JR, Solid State Ion., 57, 311 (1992)

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[8] Liu HS, Li J, Zhang ZR, Gong ZL, Yang Y, Electrochim. Acta, 49(7), 1151 (2004)

[9] Subramanian V, Fey GTK, Solid State Ion., 148(3-4), 351 (2002)

[10] Oh P, Myeong S, Cho W, Lee MJ, Ko M, Jeong HY, Cho J, Nano Lett., 14, 5965 (2014)

[11] Nomura F, Liu YB, Tanabe T, Tamura N, Tsuda T, Hagiwara T, Gunji T, Ohsaka T, Matsumoto F, Electrochim. Acta, 269, 321 (2018)

[12] Zhang HZ, Qiao QQ, Li GR, Ye SH, Gao XP, J. Mater. Chem., 22, 13104 (2012)

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[14] Xie H, Hu G, Du K, Peng Z, Cao Y, J. Alloy. Compd., 666, 84 (2016)

[15] Li W, Reimers JN, Dahn JR, Phys. Rev. B, 46, 3236 (1992)

[16] Ohzuku T, Ueda A, Nagayama M, J. Electrochem. Soc., 140, 1862 (1993)

[17] Dahn JR, Sacken UV, Michal CA, Solid State Ion., 44, 87 (1990)

[18] Choi YM, Pyun SI, Moon SI, Solid State Ion., 89(1-2), 43 (1996)

[19] Wu KC, Wang F, Gao LL, Li MR, Xiao LL, Zhao LT, Hu SJ, Wang XJ, Xu ZL, Wu QG, Electrochim. Acta, 75, 393 (2012)

[20] Wei X, Zhang S, Yang P, Li H, Wang S, Ren Y, Xing Y, Meng J, Int. J. Electrochem. Sci., 12, 5636 (2017)

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[22] Ko HS, Park HW, Lee JD, Korean Chem. Eng. Res., 56(5), 718 (2018)

[23] Yoon CS, Choi MH, Lim BB, Lee EJ, Sun YK, J. Electrochem. Soc., 162(14), A2483 (2015)

[24] Levi MD, Salitra G, Markovsky B, Teller H, Aurbach D, Heider U, Heider L, J. Electrochem. Soc., 146(4), 1279 (1999)

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