Improve electrochemical performance of spinel LiNi 0.5 Mn 1.5 O 4 via surface modified by Li 1.2 Ni 0.2 Mn 0.6 O 2 layer
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Improve electrochemical performance of spinel LiNi0.5Mn1.5O4 via surface modified by Li1.2Ni0.2Mn0.6O2 layered materials Jidong Duan1 · Yulin Liu1 · Xin Tang1 · Jing Li1 · Jianqiang Guo1 · Min Zeng1 · Lige Wang1 Received: 11 October 2019 / Accepted: 27 January 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Spinel LiNi0.5Mn1.5O4(LNMO) is one of the most promising cathode materials for lithium-ion batteries due to its high operating voltage (4.7 V, vs. Li / L i+). However, the high operating voltage will cause the LNMO capacity to decay due to the dissolution of its Mn and the decomposition of the electrolyte. Although surface modification can improve the cycle stability of LNMO, most of the current surface modification will cause different degrees of loss in discharge capacity. Herein, for the first time, L i1.2Ni0.2Mn0.6O2(LIR) is coated on the host material LNMO as the surface material by co-precipitation method. As the coating materials, LIR does not destroy the crystal structure and micromorphology of LNMO. The surface-modified material (LNMO@LIR) has higher reversible capacity with better cycle stability than LNMO. The LNMO@LIR delivers a discharge capacity of 128.32 mAh g −1 at 0.5 °C, and the capacity retention rate is up to 97.2% after 300 cycles. This work indicates that LIR coating can efficiently enhance the electrochemical performance of LNMO.
1 Introduction In recent years, lithium-ion batteries(LIBs) with their performance advantages have been widely used in human society: electronic products, electric vehicles, and fixed electrical energy storage systems [1, 2]. In search of the high-efficiency application of LIBs in more fields, various LIBs cathode materials have been developed, such as LiCoO2[3, 4], LiFePO4[5–7], LiMO2 (M = Ni, Co, Mn) [8, 9], and L iNi0.5Mn1.5O4 (LNMO) [10–12]. Among them, the spinel LiNi0.5Mn1.5O4 (LNMO) has attracted much attention of many scientific researchers, because it has a high-voltage plateau 4.7 V (vs. Li+/Li) that gives the high-energy density of 650 Wh kg−1[13]. However, the rapid capacity decay of the LNMO limits its practical application, which is caused by the presence of Mn3+ and the decomposition of the electrolyte at high voltages [14, 15]. For the sake of improving the cycle performance of LNMO, considerable attention has been paid to the element doping, microscopic morphology design of cathode * Jing Li [email protected] 1
State Key Laboratory of Environmentally‑Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China
materials and surface-coating modification. A series of elements have been applied to substitute some of Mn and Ni ions in LNMO to stabilize its crystal structure, such as Ga, Mg, Fe, Al, Ti, Cr, Cu, and Zn [16–23]. The microscopic morphology design of materials is deemed to be an effective approach. Some special morphological LNMO materials have been demonstrated to improve cycle stability and fa
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