SiO2 coated Li1.2Ni0.2Mn0.6O2 as cathode materials with rate performance, HF scavenging and thermal properties for Li-ion batteries

Zhao, Yujuan; Lv, Zhi; Xu, Tao; Li, Jingxia

doi:10.1016/j.jallcom.2017.04.311

Cited by 49 publications

(30 citation statements)

References 32 publications

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“…Cho et al [73] indicated that the SiO 2 coating layer on the surface of NCM622 shows a superior absorption of HF, being effective in improving cycle life even though with an electrolyte containing 1000 ppm of water. SiO 2 coated Li 1.2 Ni 0.2 Mn 0.6 O 2 cathode showed remarkably improved cycling stability compared to the bare one in electrolytes with 1000 and 2000 ppm water separately due to the HF scavenging capability of SiO 2 [74]. However, the abovementioned oxide-type HF scavengers are based on their sacrificial…”

Section: Surface Modification Strategies To Mitigate the Stability Issuesmentioning

confidence: 99%

A review on the stability and surface modification of layered transition-metal oxide cathodes

et al. 2021

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An ever-increasing market for electric vehicles (EVs), electronic devices and others has brought tremendous attention on the need for high energy density batteries with reliable electrochemical performances. However, even the successfully commercialized lithium (Li)-ion batteries still face significant challenges with respect to cost and safety issues when they are used in EVs. From a cathode material point of view, layered transition-metal (TM) oxides, represented by LiMO 2 (M = Ni, Mn, Co, Al, etc.) and Li-/Mn-rich xLi 2 MnO 3 Á(1-x)LiMO 2 , have been considered as promising candidates because of their high theoretical capacity, high operating voltage, and low manufacturing cost. However, layered TM oxides still have not reached their full potential for EV applications due to their intrinsic stability issues during electrochemical processes. To address these problems, a variety of surface modification strategies have been pursued in the literature. Herein, we summarize the recent progresses on the enhanced stability of layered TM oxides cathode materials by different surface modification techniques, analyze the manufacturing process and cost of the surface modification methods, and finally propose future research directions in this area.

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Section: Surface Modification Strategies To Mitigate the Stability Issuesmentioning

confidence: 99%

A review on the stability and surface modification of layered transition-metal oxide cathodes

et al. 2021

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“…In other words, scavenger coatings only postpone the inevitable degradation, which depends on the initial amount of moisture in the cell. Typical examples include binary oxides, such as Al 2 O 3 . For example, by coating the surface of LiNi 0.8 Co 0.15 Al 0.05 O 2 with a nanoparticulate Al 2 O 3 layer, Du et al reported a remarkable improvement in cycling performance at 1C rate and different temperatures and cutoff voltages.…”

Section: Coatingsmentioning

confidence: 99%

Surface Modification Strategies for Improving the Cycling Performance of Ni‐Rich Cathode Materials

et al. 2020

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Ni‐rich layered lithium metal oxides are the cathode active materials of choice for high‐energy‐density Li‐ion batteries. While the high content of Ni is responsible for the excellent capacity, it is also the source of interfacial instability, limiting the material's lifetime due to a variety of correlated in‐ and extrinsic factors. Hence, reconciling the opposing trends of high Ni content and long‐term cycling stability by modifying the material's surface is one of the challenges in the field. Here, we review various studies on surface modification of Ni‐rich (≥ 80 %) layered cathode active materials in order to categorize current research efforts. Broadly, the three strategies of coating, surface doping and washing are discussed, each with their advantages and shortcomings. In conclusion, we highlight new directions of research that could bring Ni‐rich layered lithium metal oxide cathodes from the laboratory to the real world.

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“…Strategies such as surface coating, elemental doping and morphology control, are generally used to address the above issues. Directly coating on the interface is an effective way to suppress the interfacial reactions [23][24][25][26][27][28][29][30][31]. A number of approaches, such as spray pyrolysis [32], sol-gel method [33], and vapor deposition method [34], have been employed to inhibit the electrolyte decomposition.…”

Section: Introductionmentioning

confidence: 99%

Large-scale synthesis of lithium- and manganese-rich materials with uniform thin-film Al2O3 coating for stable cathode cycling

et al. 2020

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The lithium-and manganese-rich layered oxide (LMR) holds great promise as a cathode material for lithiumion battery (LIB) applications due to its high capacity, high voltage and low cost. Unfortunately, its poor initial Coulombic efficiency (ICE) and unstable electrode/electrolyte interface with continuous growth of the solid electrolyte interphase leads to high impedance and large overpotential. These effects cause severe capacity loss and safety issues. In this work, we have developed a novel approach to fabricate a stable LMR cathode with a uniform thin layer of aluminum oxide (Al 2 O 3 ) coated on the surface of the LMR particles. This synthesis approach uses the microemulsion method that is environment-friendly, cost-effective and can be easily scaled. Typically, an 8-nm layer of Al 2 O 3 is shown to be effective in stabilizing the electrode/electrolyte interface (enhanced ICE to 82.0% and moderate impedance increase over 200 cycles). Moreover, the phase transformation from layered to spinel is inhibited (96.3% average voltage retention) and thermal stability of the structure is significantly increased (heat release reduced by 72.4%). This study opens up a new avenue to address interface issues in LIB cathodes and prompts the practical applications of high capacity and voltage materials for high energy density batteries.

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SiO2 coated Li1.2Ni0.2Mn0.6O2 as cathode materials with rate performance, HF scavenging and thermal properties for Li-ion batteries

Cited by 49 publications

References 32 publications

A review on the stability and surface modification of layered transition-metal oxide cathodes

A review on the stability and surface modification of layered transition-metal oxide cathodes

Surface Modification Strategies for Improving the Cycling Performance of Ni‐Rich Cathode Materials

Large-scale synthesis of lithium- and manganese-rich materials with uniform thin-film Al2O3 coating for stable cathode cycling

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