Electrochemical performances of lithium rich cathodes prepared via co-precipitation method with different precipitator a
- PDF / 2,450,579 Bytes
- 10 Pages / 595.276 x 790.866 pts Page_size
- 26 Downloads / 150 Views
Electrochemical performances of lithium rich cathodes prepared via co-precipitation method with different precipitator and atmosphere Hsiu‑Fen Lin1 · Han‑Lin Guo1 · Sheng‑Chieh Hsiao1 Received: 14 February 2018 / Accepted: 12 April 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract The lithium rich cathodes Li1.2(Ni0.16Co0.08Mn0.56)O2 were synthesized by different synthesis routes using hydroxide and carbonate co-precipitations. Physical properties particularly the morphology and size of the particles of the prepared cathodes varied depending on the synthesis method employed. The L i1.2(Ni0.16Co0.08Mn0.56)O2 prepared by the carbonate coprecipitation under air atmosphere exhibited the highest discharge capacity and best cycle life performance. The smallest primary and optimum secondary particle size of the cathodes contribute suitable lithium and electron diffusion path hence the electrochemical performance is improved.
1 Introduction Lithium ion batteries owing to their features of high-energy and high-power density and long-lasting battery capacity are regarded as the most promising power source for the portable consumer electronic gadgets. For wider applications, specifically, the electric vehicles, the development of new cathodes with higher capacity and high rate capability is imperative. Recently, lithium rich layered metal oxides have attracted a global interest due to their high specific capacities (~ 250 mAh g−1), low cost and high safety features as compared with the current cathodes [1, 2]. However, the charge–discharge process will cause higher irreversible capacity, lower charge–discharge rate and voltage fading [3, 4]. In the literatures, failed mechanisms of lithium-rich materials have been reported such as the formation of L i2O [5, 6], the appearance of gas evolution [7, 8], irreversible structural change [9, 10] and thick solid electrolyte interfacial (SEI) layers [11, 12]. In order to improve the electrochemical performances of lithium rich cathodes, some methods such as electrolyte additives [13], surface modification [14, 15] and metal-element doping [16–18] have been developed. However, creating better-quality pristine cathodes should be the * Hsiu‑Fen Lin [email protected] 1
Department of Materials Science and Engineering, National Formosa University, Yunlin 64054, Taiwan
first step to producing successful commercial lithium rich cathodes. Some studies have suggested that the properties of the cathodes greatly depend on the precursor, specifically, the composition, particle morphology, and size distributions [19–21]. The optimization of synthesis route is essential to obtaining a lithium rich cathode with high capacity and high rate performance. Various synthetic methods have been adopted, such as spray drying [22], sol–gel [23], organic precipitation method [24], hydrothermal method [25] and co-precipitation [26] and the last one is the most popular method to prepare the cathode precursors. In the present study, we focused on the synthesis of
Data Loading...
