Manqi Tang, Lang Qiu, Yuting Deng, Mengke Zhang, Fuqiren Guo, Qi Pang, Benhe Zhong, Yang Song, Xiaodong Guo
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引用次数: 0
Abstract
The morphology and microstructure of precursors are the key to the preparation of high-quality NCM cathodes due to their inheritance relationship. However, a large amount of sulfate exists in the precursors, to the detriment of the electrochemical performance of the Ni-rich cathode materials. Herein, an effective method for sulfate reduction was proposed for the synthesis of Ni0.90Co0.05Mn0.05(OH)2 precursor by adding 0.24 M ammonia in the microreactor. The less sulfate in the Ni(OH)2 with ammonia system is attributed to the higher formation energy of sulfate adsorption (ENi(OH)2-am-SO42– = 7.483 eV vs ENi(OH)2-SO42– = 3.451 eV). The results demonstrated that ammonia can promote the growth of primary particles (81.5 nm) and reduce the content of impurity sulfate from 0.80 to 0.28% in the precursors. Moreover, the prepared cathode materials exhibit a high specific capacity of 190.4 mAh g–1 at 1C and superior Li+ diffusion coefficients. This study sheds light on the role of ammonia in rapid coprecipitation and provides guidance for the rapid synthesis process of Ni-rich cathodes.
期刊介绍:
ndustrial & Engineering Chemistry, with variations in title and format, has been published since 1909 by the American Chemical Society. Industrial & Engineering Chemistry Research is a weekly publication that reports industrial and academic research in the broad fields of applied chemistry and chemical engineering with special focus on fundamentals, processes, and products.