SiO2-coated LiNi0.915Co0.075Al0.01O2cathode material for rechargeable Li-ion batteries

Zhou, Pengfei; Zhang, Zhen; Meng, Huanju; Lu, Yanying; Cao, Jun; Cheng, Fangyi; Tao, Zhanliang; Chen, Jun

doi:10.1039/c6nr07438c

Cited by 117 publications

(63 citation statements)

References 44 publications

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“…The rate capability of O‐LNMO is better than that of A‐LNMO. The capacity of 109.7 mAh g −1 at 10 C, outstanding among those reported on NRLC, is in sharp contrast with 46.0 mAh g −1 for A‐LNMO. Their cycling stabilities at 1 and 5 C for 100 cycles are given in Figure d.…”

Section: Resultscontrasting

confidence: 57%

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

et al. 2019

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Surface state and/or bulk structure, which are determined by different synthesis conditions, have a significant effect on the performance of an electrode material. Distinguishing their individual roles in the performance can provide guidance for the synthesis of high‐performance electrode materials. Cobalt‐free and nickel‐rich LiNi0.9Mn0.1O2, a promising cathode material, is synthesized in air and oxygen to show remarkable differences in both surface state and structure using a facile sol–gel method. Li2CO3 formed at the surface during the synthesis in air results in much poorer performance than in oxygen, which can be significantly improved by the effective removal of Li2CO3 through ultrasonic treatments without changing the bulk structure, morphology, and size. The surface state, instead of bulk structure, morphology, and size‐related elements like more severe cationic mixing and larger secondary particles, is predominantly responsible for the performance difference between the samples synthesized in air and oxygen, which is beyond the conventional viewpoints on layered compounds. This study provides a new perspective for exploring novel synthesis approaches of high‐performance cobalt‐free and nickel‐rich layered compounds.

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Section: Resultscontrasting

confidence: 57%

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

et al. 2019

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“…In contrast, the H3 phase of post-Ce-600 is well maintained after 50 cycles.I th as been determined that the graduall oss of the H3 phase of Ni-rich cathodes should be responsible for their capacity decay. [53] Figure 8f shows the resultso fe lectrochemical impedance spectroscopy (EIS) measurements tested after initial charging to 4.5 V. In the equivalent circuit shown in Figure 8f, R s is ascribed to the bulk cell resistance (electrolyte and separator, etc. In addition, the potential dif- is significantly reduced comparedw ith NCM and post-Ce-400, implyingt hat the electrochemical reversibility of Ni-rich materials can be effectively improved after Ce modificationu nder applicable temperature.…”

Section: Resultsmentioning

confidence: 99%

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Lai

et al. 2019

ChemSusChem

125

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Nickel‐rich cathode materials are among the most promising cathode materials for high‐energy lithium‐ion batteries. However, their structural and thermodynamic stability, cycle and rate performances still need to be further improved. In this study, the rare earth element Ce is employed to reinforce the interface of Ni‐rich cathode materials both internally and externally. High‐valence Ce4+ can easily cause the oxidization of Ni2+ to Ni3+ when doped into the material owing to its strong oxidation performance, thus reducing Li+/Ni2+ mixing. In addition, the inert Ce3+ ions in transition metal slabs with strong Ce−O bonds can maintain the layered structure at high delithiation state. Furthermore, when the calcination temperature during synthesis is above 500 °C, a CeO2 coating layer will form, which can protect the electrode from erosion by the electrolyte and alleviate the increasing resistance during cycling. The modified Ni‐rich materials fabricated with an erosion‐resistant CeO2 layer outside and stronger Ce−O bonds inside with reduced Li+/Ni2+ mixing exhibit excellent electrochemical properties, especially at high operating voltages, for example, the 50th capacity retention at 0.2 C within 2.75–4.5 V is improved from 89.8 % to 99.2 % after the modification.

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“…[33][34][35] LiNi 0.8 Co 0.15 Al 0.05 O 2 spheres with monodispersed crumpled yolk-shell structures were obtained via a supersonic atomization method with further heat treatment. [38,39] [36] On slightly increasing the Al content, the LiNi 0.81 Co 0.1 Al 0.09 O 2 microspheres assembled from many nanorods exhibited excellent rate capability, with capacity of 155 mAh g −1 at 10 C in the voltage range of 3−4.5 V and high thermal stability.…”

Section: Wwwadvancedsciencenewscommentioning

confidence: 99%

Recent Developments on and Prospects for Electrode Materials with Hierarchical Structures for Lithium‐Ion Batteries

Zhou

Zhang

et al. 2017

Advanced Energy Materials

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499

218

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mobile phones, and digital cameras. [1][2][3][4][5][6] Recently, LIBs have also been intensively pursued as an energy-storage technology for electrical vehicles and stationary power stations. [7][8][9][10] The reaction equations, structures, and costs of the individual components of LIBs with the common LiCoO 2 ‖polymer electrolyte‖graphite system are shown in Figure 1. It can be seen that cathode and anode materials, which serve as the most important components of LIBs, largely decide the electrochemical performance and cost of the batteries. According to the intrinsic features and reaction mechanisms of materials, four types of cathode materials and three sorts of anode materials have been investigated. [11][12][13][14][15][16] The traditional electrode material LiCoO 2 is hindered, however, by its relatively low specific capacity and the high price of Co resources, along with its inferiority in terms of environmental friendliness. LiMn 2 O 4 suffers from the Jahn-Teller distortion of Mn 3+ and the dissolution of Mn 2+ in the electrolyte, resulting in severe capacity attenuation and poor cycling performance. Graphite, as the most widely employed anode material, is limited by its finite capacity. Though Li 4 Ti 5 O 12 typically offers excellent cycle life and high safety, its relatively high potential would entail low energy density. In contrast, high-capacity Si material cannot offer long Since their successful commercialization in 1990s, lithium-ion batteries (LIBs) have been widely applied in portable digital products. The energy density and power density of LIBs are inadequate, however, to satisfy the continuous growth in demand. Considering the cost distribution in battery system, it is essential to explore cathode/anode materials with excellent rate capability and long cycle life. Nanometer-sized electrode materials could quickly take up and store numerous Li + ions, afforded by short diffusion channels and large surface area. Unfortunately, low thermodynamic stability of nanoparticles results in electrochemical agglomeration and raises the risk of side reactions on electrolyte. Thus, micro/nano and hetero/hierarchical structures, characterized by ordered assembly of different sizes, phases, and/or pores, have been developed, which enable us to effectively improve the utilization, reaction kinetics, and structural stability of electrode materials. This review summarizes the recent efforts on electrode materials with hierarchical structures, and discusses the effects of hierarchical structures on electrochemical performance in detail. Multidimensional self-assembled structures can achieve integration of the advantages of materials with different sizes. Core/yolk-shell structures provide synergistic effects between the shell and the core/yolk. Porous structures with macro-, meso-, and micropores can accommodate volume expansion and facilitate electrolyte infiltration.

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SiO₂-coated LiNi_0.915Co_0.075Al_0.01O₂cathode material for rechargeable Li-ion batteries

Cited by 117 publications

References 44 publications

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Recent Developments on and Prospects for Electrode Materials with Hierarchical Structures for Lithium‐Ion Batteries

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SiO2-coated LiNi0.915Co0.075Al0.01O2cathode material for rechargeable Li-ion batteries

Cited by 117 publications

References 44 publications

Origin of Performance Differences of Nickel‐Rich LiNi0.9Mn0.1O2 Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi0.9Mn0.1O2 Cathode Materials Synthesized in Oxygen and Air

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi0.8Co0.1Mn0.1O2 Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage

Recent Developments on and Prospects for Electrode Materials with Hierarchical Structures for Lithium‐Ion Batteries

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SiO₂-coated LiNi_0.915Co_0.075Al_0.01O₂cathode material for rechargeable Li-ion batteries

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Origin of Performance Differences of Nickel‐Rich LiNi_0.9Mn_0.1O₂ Cathode Materials Synthesized in Oxygen and Air

Use of Ce to Reinforce the Interface of Ni‐Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode Materials for Lithium‐Ion Batteries under High Operating Voltage