Improving the electrochemical properties of high-energy cathode material LiNi0.5Co0.2Mn0.3O2 by Zr doping and sintering in oxygen

Du, Qing-Xia; Tang, Zhongfeng; Ma, Xiaohang; Zang, Yong; Sun, Xiaohua; Shao, Yu; Zhang, Wen; Chen, Chunhua

doi:10.1016/j.ssi.2015.07.006

Cited by 38 publications

(18 citation statements)

References 21 publications

(28 reference statements)

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“…Aside from materials for NMC development, preparation methods are also being investigated due to similar influences on the cycling/thermal stability of Ni-rich NMC materials, commonly allowing for the reduction of cation mixing. For example, Du et al [154] have reported that NMC532 sintered in oxygen can exhibit lower degrees of cation disordering, less oxygen defects and higher discharge capacities. These researchers also reported that if Ni 2+ was partially replaced by Li + , the remaining Ni existed as Ni 3+ , leading to capacity loss [154].…”

Section: Advanced Preparation Methodsmentioning

confidence: 99%

“…For example, Du et al [154] have reported that NMC532 sintered in oxygen can exhibit lower degrees of cation disordering, less oxygen defects and higher discharge capacities. These researchers also reported that if Ni 2+ was partially replaced by Li + , the remaining Ni existed as Ni 3+ , leading to capacity loss [154]. In addition, researchers have also reported that the atomization co-precipitation method can be used to obtain homogeneous spherical shaped primary NMC particles by forming an aerosol of precursors with an ultrasonic nebulizer [205] and that a similar effect can be achieved by using a self-combustion method, which produces massive heat flow to accelerate synthesis and therefore improve the uniformity of NMC particles [206].…”

Section: Advanced Preparation Methodsmentioning

confidence: 99%

“…To achieve doping/ atom substitution, researchers often use co-precipitation, solid-state reaction, self-combustion and co-calcination, in which the two types of doping include cationic doping and anionic doping. And in general, few dopants can affect the layered structure of electrodes, but some can form new phases (e.g., the presence of a Li 2 SnO 3 phase in Sn-doped NMC622 [153] and the presence of Li 2 ZrO 3 in Zr-doped NMC532 154 ).…”

Section: Inner Surfacementioning

confidence: 99%

“…Here, reported results of different cationic dopants can sometimes be contradictory in which enlarged lattices due to cationic dopants with larger radii can either promote (mostly reported) or hinder (blocking effect, rarely reported) Li + diffusion in different studies. Because of this, these results need to be comprehensively reviewed in the future [154,160].…”

Section: Inner Surfacementioning

confidence: 99%

“…To achieve better cycling stability, capacity is sometimes sacrificed because some dopants such as Al 3+ are chemically inactive [28]. Cr doping can improve cycling stability without capacity decrease [161], and Zr doping can enhance cycling performance [154,162] but will reportedly produce a Li 2 ZrO 3 phase. In addition, different dopants possess different valences and stabilize crystal structures at different sites.…”

Section: Inner Surfacementioning

confidence: 99%

See 4 more Smart Citations

Degradation Mechanisms and Mitigation Strategies of Nickel-Rich NMC-Based Lithium-Ion Batteries

Yuan

Zhang

et al. 2019

Electrochem. Energ. Rev.

489

383

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The demand for lithium-ion batteries (LIBs) with high mass-specific capacities, high rate capabilities and long-term cyclabilities is driving the research and development of LIBs with nickel-rich NMC (LiNi x Mn y Co 1−x−y O 2 , x ⩾ 0.5 ) cathodes and graphite (Li x C 6 ) anodes. Based on this, this review will summarize recently reported and widely recognized studies of the degradation mechanisms of Ni-rich NMC cathodes and graphite anodes. And with a broad collection of proposed mechanisms on both atomic and micrometer scales, this review can supplement previous degradation studies of Ni-rich NMC batteries. In addition, this review will categorize advanced mitigation strategies for both electrodes based on different modifications in which Ni-rich NMC cathode improvement strategies involve dopants, gradient layers, surface coatings, carbon matrixes and advanced synthesis methods, whereas graphite anode improvement strategies involve surface coatings, charge/discharge protocols and electrolyte volume estimations. Electrolyte components that can facilitate the stabilization of anodic solid electrolyte interfaces are also reviewed, and trade-offs between modification techniques as well as controversies are discussed for a deeper understanding of the mitigation strategies of Ni-rich NMC/graphite LIBs. Furthermore, this review will present various physical and electrochemical diagnostic tools that are vital in the elucidation of degradation mechanisms during operation to supplement future degradation studies. Finally, this review will summarize current research focuses and propose future research directions.

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Section: Advanced Preparation Methodsmentioning

confidence: 99%

Section: Advanced Preparation Methodsmentioning

confidence: 99%

Section: Inner Surfacementioning

confidence: 99%

Section: Inner Surfacementioning

confidence: 99%

Section: Inner Surfacementioning

confidence: 99%

See 3 more Smart Citations

Degradation Mechanisms and Mitigation Strategies of Nickel-Rich NMC-Based Lithium-Ion Batteries

Yuan

Zhang

et al. 2019

Electrochem. Energ. Rev.

489

383

View full text Add to dashboard Cite

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Recent Progress and Perspective of Advanced High‐Energy Co‐Less Ni‐Rich Cathodes for Li‐Ion Batteries: Yesterday, Today, and Tomorrow

Choi

Voronina

Sun

et al. 2020

Advanced Energy Materials

263

174

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With the ever‐increasing requirement for high‐energy density lithium‐ion batteries (LIBs) to drive pure/hybrid electric vehicles (EVs), considerable attention has been paid to the development of cathode materials with high energy densities because they ultimately determine the energy density of LIBs. Notably, the cost of cathode materials is still the main obstacle hindering the extensive application of EVs, with the cost accounting for 40% of the total cost of fabricating LIBs. Therefore, enhancing the energy density and simultaneously decreasing the cost of LIBs are essential for the success of EV/hybrid EV industries. Among the existing commercial cathodes, Ni‐rich layered cathodes are widely employed because of their high energy density, relatively good rate capability, and reasonable cycling performance. Ni‐rich layered cathodes containing Co are now being reconsidered due to the increasing price of Co, which is much higher than that of Ni and Mn. In this report, the recent developments and strategies in the improvement of the stabilities of the bulk and surface for Co‐less Ni‐rich layered cathode materials are reviewed.

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Sufficient Utilization of Zirconium Ions to Improve the Structure and Surface properties of Nickel‐Rich Cathode Materials for Lithium‐Ion Batteries

et al. 2018

ChemSusChem

129

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We doped Zr ions in the outer layer of Ni Co Mn (OH) by coprecipitation. The distribution of Zr in the final cathode materials showed a gradient distribution because of ion migration during the thermal treatment. The doped layer was confirmed by using various analysis methods (energy-dispersive X-ray spectroscopy, XRD, X-ray photoelectron spectroscopy, and TEM), which implies that Zr can not only occupy both the transition metal slabs and Li slabs but also form a Li ZrO layer on the surface as a highly ion-conductive layer. The doped Zr in the transition metal slabs can stabilize the crystal structure because of the strong Zr-O bond energy, and the doped Zr in the Li slabs can act as pillar ions to improve the structural stability and reduce cation mixing. The gradient doping can take advantage of the "pillar effect" and restrain the "blocking effect" of the pillar ions, which reduces irreversible capacity loss and improves the cycling and rate performance of the Ni-rich cathode materials. The capacity retention of the modified sample reached 83.2 % after 200 cycles at 1C (200 mA g ) at 2.8-4.5 V, and the discharge capacity was up to 164.7 mAh g at 10C. This effective strategy can improve the structure stability of the cathode material while reducing the amount of non-electrochemical active dopant because of the gradient distribution of the dopant. In addition, the highly ion-conductive layer of Li ZrO on the surface can improve the rate performance of the cathode.

show abstract

Improving the electrochemical properties of high-energy cathode material LiNi0.5Co0.2Mn0.3O2 by Zr doping and sintering in oxygen

Cited by 38 publications

References 21 publications

Degradation Mechanisms and Mitigation Strategies of Nickel-Rich NMC-Based Lithium-Ion Batteries

Degradation Mechanisms and Mitigation Strategies of Nickel-Rich NMC-Based Lithium-Ion Batteries

Recent Progress and Perspective of Advanced High‐Energy Co‐Less Ni‐Rich Cathodes for Li‐Ion Batteries: Yesterday, Today, and Tomorrow

Sufficient Utilization of Zirconium Ions to Improve the Structure and Surface properties of Nickel‐Rich Cathode Materials for Lithium‐Ion Batteries

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