Enhancing high-voltage electrochemical performance of LiNi 0.7 Mn 0.15 Co 0.15 O 2 cathode materials with SiO 2 coatings
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ORIGINAL PAPER
Enhancing high-voltage electrochemical performance of LiNi0.7Mn0.15Co0.15O2 cathode materials with SiO2 coatings via electrostatic attraction forces method Wei Li 1,2 & Yunjiao Li 1,2 & LiShan Yang 3 & YongXiang Chen 1,2 & Jia Guo 1,2 & Jie Zhu 1,2 & Guo Lin Cao 1,2 Received: 17 May 2020 / Revised: 5 June 2020 / Accepted: 10 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract SiO2-coated LiNi0.7Mn0.15Co0.15O2 materials were successfully prepared by electrostatic attraction forces method via adjusting the Zeta potential between SiO2 and LiNi0.7Co0.15Mn0.15O2 in the suspension with the followed heating process. The structure, morphology, and electrochemical performances were characterized by XRD, SEM, TEM, XPS, CV, and EIS. As a result, compared with that with 71.4% capacity retention of bare materials, 1.0 wt% SiO2-coated LiNi0.7Co0.15Mn0.15O2 (NCM-S10) could deliver 184.50 mAh g−1 with 86.4% capacity retention after 100 cycles at 1 C over 3–4.5 V. In high temperature (55 °C), NCM-S10 also has 76.2% capacity retention after 100 cycles (3–4.5 V, 1 C), showing better cycling stability than that of the pristine (61.5%). The SiO2 coating layer efficiently inhibits side reaction between electrode and electrolyte and maintains the surface structure of LiNi0.7Co0.15Mn0.15O2. The increase in impedance is suppressed during the cycle, thereby enhances electrochemical properties of LiNi0.7Co0.15Mn0.15O2 in high voltage. Keywords Electrostatic attraction forces method . LiNi0.7Co0.15Mn0.15O2 . SiO2 coated . High voltage . Side reaction
Introduction Due to the high energy density and long cycle life, lithium-ion batteries (LIBs) have been considered as the most suitable replacer for lead-acid batteries and nickel-metal hydride batteries widely used in 3C products, energy storage systems, and
electric vehicles [1–4]. Although great progress has been achieved, the limited energy density of LIBs is still regarded as the main restriction for widespread application in the past decades [5–8]. Therefore, it is necessary to search for high discharge capacity and high operating voltage cathode materials to satisfy the urgent demand.
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s11581-020-03657-8) contains supplementary material, which is available to authorized users. * Yunjiao Li [email protected] Wei Li [email protected] LiShan Yang [email protected] YongXiang Chen [email protected] Jia Guo [email protected] Jie Zhu [email protected]
Guo Lin Cao [email protected] 1
School of Metallurgy and Environment, Central South University, Changsha 410083, People’s Republic of China
2
Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, China
3
National & Local Joint Engineering Laboratory for New Petrochemical Materials & Fine Utilization of Resources, Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education of China), K
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