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Low Temperature Performance of the Li[Li0.2Co0.4Mn0.4]O2 Cathode Material in Different Electrolytes

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The Li[Li0.2Co0.4Mn0.4]O2 cathode material is prepared by sol–gel method. The extraction Li+ ions from the transition metal layer are only 40%, and the initial discharge capacity is 155 mAh g-1 in the electrolyte of EC:DMC:EMC = 1:1:8 at -20 °C. Moreover, it exhibits excellent capacity retention of 96.32% after thirty cycles. Cyclic voltammetry shows the material reacts insufficiently at the low temperature. The inactive Mn4+ ions suppress the dissolution of manganese and the Jahn–Teller distortion of the material lattice, both of which lead to a better cycling performance than that at room temperature. In addition, the low melting point of EMC enhances the mobility of the traditional commercial electrolyte (EC:DMC = 1:1) at -20 °C. Thus, the material shows the lower charge transfer resistance after 30 cycles and improved rate ability when the EMC is introduced.
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Keywords: EMC; Electrolyte; Layered Material; Li-Ion Battery; Low Temperature

Document Type: Research Article

Affiliations: 1: College of Environmental and Chemical Engineering, Shenyang Ligong University, Shenyang 110159, P. R. China 2: Key Laboratory of Physics and Technology for Advanced Batteries (Ministry of Education), College of Physics, Jilin University, Changchun, 130012, P. R. China

Publication date: August 1, 2017

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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