Improvement of electrochemical performance of LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathode material via Li 2.09 W 0.9 Nb 0.1 O 4 L
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ORIGINAL PAPER
Improvement of electrochemical performance of LiNi0.8Co0.1Mn0.1O2 cathode material via Li2.09W0.9Nb0.1O4 Li-ion conductive coating layer Xinghan Zhang 1,2 & Fei Ma 2 & Guangye Wei 2 & Ze Lei 1 & Jingkui Qu 2 Received: 7 April 2020 / Revised: 30 May 2020 / Accepted: 23 June 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Recently, niobium tungsten oxide has garnered considerable attention owing to its excellent Li-ion diffusion rate and prominent structural stability during charge–discharge cycles. Here, a cathode material (LiNi0.8Co0.1Mn0.1O2, NCM811) for Li-ion batteries is successfully coated with Li-ion conductive Li2.09W0.9Nb0.1O4 using a simple wet-chemical coating method followed by hightemperature sintering. A physicochemical phase analysis reveals that a 4–5-nm-thick coating with a Li2.09W0.9Nb0.1O4 crystal structure is evenly distributed on the surface of the cathode particles. Among cathodes coated with different amounts of material, the one coated with 0.5 wt% Li2.09W0.9Nb0.1O4 yielded the best overall performance, with a high discharge capacity of 136.8 mAh g−1 at 10 C and long-term cycling stability with a capacity retention of 91.7% after 100 cycles at 1 C. This excellent electrochemical performance can be attributed to the coating’s ability to prevent the impedance from increasing and the Li-ion diffusion coefficient from decaying. In addition, it protects the cathode from side reactions and stabilizes the structure during cycling. Keywords Lithium-ion batteries . NCM811 cathode . Li2.09W0.9Nb0.1O4 modification . Li-ion conductivity
Introduction Li-ion batteries (LIBs) are the most prevalent energy storage technology for many applications, including portable consumer electronics and plug-in hybrid electric vehicles (EVs) [1, 2]. Moreover, the demand for LIBs is predicted to grow remarkably for the following year, driven principally by mounting concerns about the environment and calls to increase vehicle electrification. In addition to increasing battery safety and decreasing costs, a significant challenge for the LIB market is to further increase the specific energy (Wh kg−1), the volumetric energy density (Wh L−1), and cycle performance of the cell, Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10008-020-04742-8) contains supplementary material, which is available to authorized users. * Jingkui Qu [email protected] 1
School of Chemical & Environmental Engineering, China University of Mining and Technology-Beijing, Beijing 100083, China
2
National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
all of which directly determine the driving range of EVs [2–4]. Compared with the commercialized materials such as layered LiCoO2 (140 mAh g−1), spinel LiMn2O4 (120 mAh g−1), and olivine LiFePO4 (160 mAh g−1), LiNi0.5Co0.2Mn0.3O2 (NCM523) and LiNi0.6Co0.2Mn0.2O2 (NCM-622) are presently regarded as state-o
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