Cathode Materials: Ni and Co Segregations on Selective Surface Facets and Rational Design of Layered Lithium Transition‐Metal Oxide Cathodes (Adv. Energy Mater. 9/2016)

Yan, Pengfei; Zheng, Jianming; Zheng, Jiaxin; Wang, Zhiguo; Teng, Gaofeng; Kuppan, Saravanan; Xiao, Jie; Chen, Guoying; Pan, Feng; Zhang, Ji‐Guang; Wang, Chongmin

doi:10.1002/aenm.201670054

Cited by 14 publications

(16 citation statements)

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“…A representative figure from each degradation mechanism is shown in Figure 4 . It should be emphasized that although these phenomena are casted into distinct groups, their occurrence are highly corelative and often happen as a chain of events . Migration of transition metals (Figure A) from their octahedral sites into the alternating Li octahedral sites upon excessive Li‐deintercalation (increased formation of Li vacancies) and/or temperature rise, is regarded as an initial step in the structural degradation of the NMC/NCA cathodes .…”

Section: Mechanisms Of Cathodes Degradationsmentioning

confidence: 99%

Oxygen Release Degradation in Li‐Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches

Sharifi‐Asl

Lü

Amine

et al. 2019

Advanced Energy Materials

356

233

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Widespread application of Li‐ion batteries (LIBs) in large‐scale transportation and grid storage systems requires highly stable and safe performance of the batteries in prolonged and diverse service conditions. Oxygen release from oxygen‐containing positive electrode materials is one of the major structural degradations resulting in rapid capacity/voltage fading of the battery and triggering the parasitic thermal runaway events. Herein, the authors summarize the recent progress in understanding the mechanisms of the oxygen release phenomena and correlative structural degradations observed in four major groups of cathode materials: layered, spinel, olivine, and Li‐rich cathodes. In addition, the engineering and materials design approaches that improve the structural integrity of the cathode materials and minimize the detrimental O2 evolution reaction are summarized. The authors believe that this review can guide researchers on developing mitigation strategies for the design of next‐generation oxygen‐containing cathode materials where the oxygen release is no longer a major degradation issue.

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Section: Mechanisms Of Cathodes Degradationsmentioning

confidence: 99%

Oxygen Release Degradation in Li‐Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches

Sharifi‐Asl

Lü

Amine

et al. 2019

Advanced Energy Materials

356

233

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“…In LIBs, the dissolution of TM ions starting from the cathode surface/interface, particularly for the Mn, specifically takes place at the elevated cutoff voltages and high temperatures. And their subsequent deposition on the anodes has been known as a main reason for the structural degradation and capacity fading of cathodes . It is well established that the trace amount of water inevitably exists both in the nonaqueous LiPF 6 ‐based electrolytes and Ni‐rich cathodes surfaces.…”

Section: Origins Of Surface/interface Structure Degradationmentioning

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

151

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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“…In addition, bulk structural degradation is another vital factor that deteriorates the electrode capacity. It was reported that Ni‐rich materials suffer severe irreversible phase transition, from the layered structure ( R ‐3 m ) to the spinel‐like phase ( Fd ‐3 m ) and rock‐salt phase ( Fm ‐3 m ) due to extensive cation mixing because of the similarity of ionic radius between Li + (0.76 Å) and Ni 2+ (0.69 Å) . Recently, many researchers demonstrated that the internal mechanical stress, originated form abrupt lattice shrinkage in the c ‐direction induced by the phase transition from H2 to H3, should take responsibility for the microcracks generation and propagation, which allows the penetration of electrolyte as well as exposing the internal surface where electrolyte attack and side reactions occur, and further aggravating the bulk structural and mechanical degradation of Ni‐rich cathodes .…”

Section: Introductionmentioning

confidence: 99%

Simultaneously Dual Modification of Ni‐Rich Layered Oxide Cathode for High‐Energy Lithium‐Ion Batteries

Yang

et al. 2019

Adv Funct Materials

472

274

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A critical challenge in the commercialization of layer-structured Ni-rich materials is the fast capacity drop and voltage fading due to the interfacial instability and bulk structural degradation of the cathodes during battery operation. Herein, with the guidance of theoretical calculations of migration energy difference between La and Ti from the surface to the inside of LiNi 0.8 Co 0.1 Mn 0.1 O 2 , for the first time, Ti-doped and La 4 NiLiO 8 -coated LiNi 0.8 Co 0.1 Mn 0.1 O 2 cathodes are rationally designed and prepared, via a simple and convenient dual-modification strategy of synchronous synthesis and in situ modification. Impressively, the dual modified materials show remarkably improved electrochemical performance and largely suppressed voltage fading, even under exertive operational conditions at elevated temperature and under extended cutoff voltage. Further studies reveal that the nanoscale structural degradation on material surfaces and the appearance of intergranular cracks associated with the inconsistent evolution of structural degradation at the particle level can be effectively suppressed by the synergetic effect of the conductive La 4 NiLiO 8 coating layer and the strong TiO bond. The present work demonstrates that our strategy can simultaneously address the two issues with respect to interfacial instability and bulk structural degradation, and it represents a significant progress in the development of advanced cathode materials for high-performance lithium-ion batteries.

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Cathode Materials: Ni and Co Segregations on Selective Surface Facets and Rational Design of Layered Lithium Transition‐Metal Oxide Cathodes (Adv. Energy Mater. 9/2016)

Cited by 14 publications

References 0 publications

Oxygen Release Degradation in Li‐Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches

Oxygen Release Degradation in Li‐Ion Battery Cathode Materials: Mechanisms and Mitigating Approaches

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

Simultaneously Dual Modification of Ni‐Rich Layered Oxide Cathode for High‐Energy Lithium‐Ion Batteries

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