Large-Scale Synthesis of High Electrochemical Performance LiNi 0.5 Mn 1.5 O 4 by using a Polyvinylpyrrolidone-Assisted C
- PDF / 567,534 Bytes
- 5 Pages / 595.22 x 842 pts (A4) Page_size
- 84 Downloads / 200 Views
Large-Scale Synthesis of High Electrochemical Performance LiNi0.5 Mn1.5 O4 by using a Polyvinylpyrrolidone-Assisted Citric-Acid Sol-Gel Combustion Method Boseon Yun and Jongin Hong∗ Department of Chemistry, Chung-Ang University, Seoul 06974, Korea
Myung-Gil Kim† School of Advanced Materials Science & Engineering, Sungkyunkwan University, Suwon 16419, Korea (Received 24 June 2020; revised 23 July 2020; accepted 23 July 2020) For large-scale cathode-material synthesis, the sol-gel process with an atomically mixed metal precursor could provide a facile route to achieve a homogeneously mixed oxide-based cathode material. However, the industrial feasibility of this strategy could be limited by the high preparation cost of the precursors. Although this can be addressed by utilizing low-cost reagents and simplifying the calcination step, typically a trade-off would exist between the cost and the performance. In this study, we demonstrate the facile large-scale synthesis of lithium nickel manganese oxide (LiNi0.5 Mn1.5 O4 ) by using a polyvinylpyrrolidone-assisted citric-acid sol-gel combustion method. After single-step calcination at 900 ◦ C for 12 h, the LiNi0.5 Mn1.5 O4 particles with a truncated octahedron morphology showed a superb discharge capacity (130.8 mAh·g−1 ) and cyclability (90.9% after 200 cycles). Keywords: LiNi0.5 Mn1.5 O4 , Polyvinylpyrrolidone, Sol-gel process, Large-scale synthesis DOI: 10.3938/jkps.77.332
I. INTRODUCTION
Along with advances in technology, the growth in the demand for safe and durable energy storage devices with high power and energy density has been steady. Because the electrochemical performance of a battery depends significantly on the intrinsic properties of electrode materials, the amount of research on modifying the nature of electrochemical properties of cathode materials has been huge. Among numerous materials, spinel LiNi0.5 Mn1.5 O4 has attracted interest because of its potential to have high-voltage plateau at a voltage above 4.5 V when manganese is partially replaced with other transition metals such as Cr, Fe, Co, Ni, etc. [1–3]. Among them, only LiNi0.5 Mn1.5 O4 (LNMO) has presented acceptable cyclability and gathered huge interest over the other candidates. Not only the research on cathode materials but also their method of preparation has been studied because the size of the particle, crystallinity, and electrochemical behavior of cathode materials are noticeably affected by their preparation methods and crystallization process [4]. In the past two decades, various synthesis methods and routes, which includes conventional solid-state reaction ∗ E-mail: † E-mail:
[email protected] [email protected]
pISSN:0374-4884/eISSN:1976-8524
[5–7], hydrothermal synthesis [8,9], molten salt synthesis [10,11], co-precipitation [12–14], sol-gel process [15,16], etc., were investigated for high discharge capacity and cyclability. Even though each method has advantages and disadvantages, the co-precipitation method and the solgel process gathered massive attention due to their having produ
Data Loading...
