Electrochemical Property-Structure Correlation for Ni-Based Layered Na-Ion Cathodes

Cheng Chen; Bo Han; Guixian Lin; Qun Huang; Shuai Zhao; Datong Zhang; Cheng Ma; Douglas G Ivey; Weifeng Wei

doi:10.1021/acsami.8b10519

Electrochemical Property-Structure Correlation for Ni-Based Layered Na-Ion Cathodes

ACS Appl Mater Interfaces. 2018 Aug 29;10(34):28719-28725. doi: 10.1021/acsami.8b10519. Epub 2018 Aug 16.

Authors

Cheng Chen¹, Bo Han¹, Guixian Lin¹, Qun Huang¹, Shuai Zhao¹, Datong Zhang¹, Cheng Ma¹, Douglas G Ivey², Weifeng Wei¹

Affiliations

¹ State Key Laboratory of Powder Metallurgy , Central South University , Changsha , Hunan 410083 , People's Republic of China.
² Department of Chemical & Materials Engineering , University of Alberta , Edmonton , Alberta T6G 1H9 , Canada.

PMID: 30070822
DOI: 10.1021/acsami.8b10519

Abstract

A class of Ni-based layered Na _xNi_0.5Mn_0.3Co_0.2O₂ oxide composites is prepared via a solid-state process. Mixed P-, O-, and P-/O-type phases can be obtained by tuning the Na content and annealing temperature, as demonstrated by structural and chemical characterization. Among these materials, the triphase P2/P'3/O'3-type composite exhibits the best overall electrochemical performance. Specifically, this triphase composite delivers a high specific capacity of 126 mA h g^-1 in the potential range of 1.5-4.2 V, high rate capability (∼72% of its initial capacity at a rate of 5 C), and good capacity retention after 100 cycles at 0.5 C. The structural transition mechanism for each phase upon electrochemical cycling is investigated, providing insights into the correlation between electrochemical properties and the crystal structure of Ni-rich layered Na _xNi_0.5Mn_0.3Co_0.2O₂ oxide composites.

Keywords: cathode materials; mixed phases; nickel-based layered oxides; phase transition; sodium-ion batteries.