Abstract
In this study, a one-pot method of polymer-mediating process is proposed to synthesize high voltage spinels (LiNi 1/2 Mn 3/2 O 4 ) with tunable particle size and high-crystallization. The primary particle size can be controlled from nanometer to micrometer via changing different type of polymer additives. Relationships between particle sizes and electrochemical performances at wide temperature ranges (-20 °C-55°C) are investigated. Nano-sized spinel delivers a good rate capability and higher capacitance at both room and low temperatures, while the micro-sized spinel performs better in capacity retention, especially at elevated temperature. The correlations among the particle size, temperature durability and cycling stability are demonstrated. Besides, the influence of polymer-mediation on the morphology transformation of spinel is also probed and discussed. © 2014 Elsevier B.V. All rights reserved.