Improving the reversibility of the H2-H3 phase transitions for layered Ni-rich oxide cathode towards retarded structural transition and enhanced cycle stability

Wu, Feng; Liu, Na; Chen, Lai; Su, Yuefeng; Tan, Guoqiang; Bao, Lei; Zhang, Qiyu; Lu, Yun; Wang, Jing; Chen, Shi; Tan, Jing

doi:10.1016/j.nanoen.2019.02.027

Cited by 357 publications

(228 citation statements)

References 35 publications

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“…In contrast, the LiNi 0. [7,12] As seen, both cathodes exhibit similar phase transition processes at the first charge (first from H1 to H2, then from H2 to H3), which is in good line with previous studies. Figure 3a depicts the contour plots of several XRD peaks-(003), (101), (108), and (110) at the first charging process.…”

Section: Structural Analysissupporting

confidence: 91%

“…As reflected in Figure 3a, for both samples, the (003) peak initially shifts toward lower 2θ degree at low state of charge, which is associated with the lattice expansion along the c-axis due to the repulsion from direct exposure of oxygen anions at adjacent layers. [12] Notably, this lattice shrinkage process along the c-axis is more rapid and aggressive than the initial expansion during charge, which gives rise to severe accumulation of internal strains. [12] Notably, this lattice shrinkage process along the c-axis is more rapid and aggressive than the initial expansion during charge, which gives rise to severe accumulation of internal strains.…”

Section: Structural Analysismentioning

confidence: 99%

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A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

Manthiram

2019

Advanced Energy Materials

136

109

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Ultrahigh‐Ni layered oxides hold great promise as high‐energy‐density cathodes at an affordable cost for lithium‐ion batteries, yet their practical application is greatly hampered by the poor cyclability. Herein, by employing LiNi0.94Co0.06O2 as a model cathode in a full‐cell configuration, the interphasial and structural evolution processes of ultrahigh‐Ni layered oxides are systematically investigated over the course of their service life (1500 cycles). By applying advanced analytic techniques (e.g., Li‐isotope labeling, region‐of‐interest method), the dynamic chemical evolution on the cathode surface is revealed with spatial resolution, and the correlation between lattice distortion and cathode surface reactivity is established. Benefiting from in situ X‐ray diffraction (XRD) analysis, the ultrahigh‐Ni layered oxide is demonstrated to undergo dual‐phase reaction mechanisms with huge lattice variation, which leads to a decrease in crystallinity and secondary particle pulverization. Furthermore, the critical impact of cathode surface reaction on the graphite anode–electrolyte interphase (AEI) is revealed at nanometer scale, and a universal chemical/physical evolution process of the AEI is illustrated, for the first time. Finally, the practical viability of ultrahigh‐Ni layered oxides is demonstrated through Al‐doping strategy. This work presents a comprehensive understanding of the structural and interphasial degradation of ultrahigh‐Ni layered oxide cathodes for developing high‐energy‐density lithium‐ion batteries.

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Section: Structural Analysissupporting

confidence: 91%

Section: Structural Analysismentioning

confidence: 99%

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

Manthiram

2019

Advanced Energy Materials

136

109

View full text Add to dashboard Cite

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“…Additionally, Wu et al propose that the key to tackle the issues faced to Ni‐rich cathodes lies in the reversible phase transition of H2–H3. To this end, the LiNi 0.9 Co 0.1 O 2 cathode with a nanoscaled cation‐mixing layer induced by surficial Ti 4+ doping is fabricated . The surficial Ti 4+ doping can induce the reduction of Ni 3+ to Ni 2+ at surface region, and the latter tends to migrate into Li‐slabs, preforming a cation‐mixing layer and causing the less‐ordered structure.…”

Section: Strategies To Mitigate the Surface/interface Structure Degramentioning

confidence: 99%

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

Liang

Zhang

Zhao

et al. 2019

Adv Materials Inter

144

111

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Nickel‐rich layered transition‐metal oxides with high‐capacity and high‐power capabilities are established as the principal cathode candidates for next‐generation lithium‐ion batteries. However, several intractable issues such as the poor thermal stability and rapid capacity fade as well as the air‐sensitivity particularly for the Ni content over 80% have seriously restricted their broadly practical applications. The properties and nature of the stable surface/interface, where the Li+ shuttles back and forth between the cathode and electrolyte, play a significant role in their ultimate lithium‐storage performance and industrial processability. Thus, tremendous efforts are made to in‐depth understanding of the essential origins of surface/interface structure degradation and efficient surface modification methodologies are intensively explored. The purpose of the contribution is first to provide a comprehensive review of the up‐to‐date mechanisms proposed to rationally elucidate the surface/interface behaviors, and then, focus on recent developed strategies to optimize the surface/interface structure and chemistry including synthetic condition regulation, surface doping, surface coating, dual doping‐coating modification, and concentration‐gradient structure as well as electrolyte additives. Finally, the perspective on future research trends and feasible approaches toward advanced Ni‐rich cathodes with stable surface/interface is presented briefly.

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“…One is that reactive Ni 4 + ions form with the releasing of oxygen during the delithiation/lithiation and further produce inactive species at the interface with electrolyte. [6][7][8] Another main reason is the formation of microcracks between the primary particles, which are produced by the variation of anisotropic lattice during longterm cycling. [9,10] The irreversible structural transformations of surface and bulk phase can reduce active-mass/lithium and increase the interface resistance.…”

Section: Introductionmentioning

confidence: 99%

New Insight into the Role of Mn Doping on the Bulk Structure Stability and Interfacial Stability of Ni‐Rich Layered Oxide

Zhuang

Gao

et al. 2020

ChemNanoMat

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Nickel‐rich layered oxides have developed into appealing cathode materials for lithium‐ion batteries in recent years for the sake of high energy density and low cost, but they suffer from severe capacity deterioration during long‐term cycling. Herein, Mn‐doped nickel‐rich Li(Ni0.88Co0.09Al0.03)1‐δMnδO2 (δ=0, 0.01, 0.02) cathode materials with a nanoscale NixMn1−xO‐type pillar layer are synthesized using a facile high‐shear dry mixing and high‐temperature calcination process in this study. The as‐fabricated M0.01−NCA electrode with a NixMn1−xO‐type layer about 20 nm exhibits excellent cycle performance compared with the pristine in coin‐cells and in pouch cells (the long‐term cycle number is four times that of the pristine). Detailed investigation of the fading mechanism is performed by HRTEM, ex‐situ XRD, XPS et al. The enhanced performance is directly related to the synergetic effects of bulk inactive Mn4+ doping and the increased nanoscale NixMn1−xO‐type pillar layer. The Mn dopants stabilize the lattice structure thus decreasing the microcracks, and the pillar layer protects the cathode from parasitic reactions with electrolytes during long‐term cycling. This work gives a new insight into the role of Mn doping on the enhanced structure of nickel‐rich layered oxides.

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Improving the reversibility of the H2-H3 phase transitions for layered Ni-rich oxide cathode towards retarded structural transition and enhanced cycle stability

Cited by 357 publications

References 35 publications

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

A Comprehensive Analysis of the Interphasial and Structural Evolution over Long‐Term Cycling of Ultrahigh‐Nickel Cathodes in Lithium‐Ion Batteries

Surface/Interface Structure Degradation of Ni‐Rich Layered Oxide Cathodes toward Lithium‐Ion Batteries: Fundamental Mechanisms and Remedying Strategies

New Insight into the Role of Mn Doping on the Bulk Structure Stability and Interfacial Stability of Ni‐Rich Layered Oxide

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