High‐Rate Charging Induced Intermediate Phases and Structural Changes of Layer‐Structured Cathode for Lithium‐Ion Batteries

Zhou, Yong‐Ning; Yue, Ji-Li; Hu, Enyuan; Li, Hong; Gu, Lin; Nam, Ki Woong; Bak, Seong‐Min; Yu, Xiqian; Liu, Jue; Bai, Jianming; Dooryhée, E.; Fu, Zheng‐Wen; Yang, Xiao‐Qing

doi:10.1002/aenm.201600597

Cited by 136 publications

(121 citation statements)

References 42 publications

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“…8 With an aim to investigate the mechanism behind the severe particle pulverization, in situ XRD was employed to elucidate the phase transition process of the layered oxides (LiNi 0.94 Co 0.06 O 2 and LiNi 0.8 Co 0.1 Mn 0.1 O 2 ). [7,13,14] Specifically, for both samples, the (110) peak shifts monotonically toward higher 2θ degree during the delithiation process, implying continuous lattice shrinkage along the a-and b-axes. Note the peak shift at (003) represents the lattice parameter variation along the c-axis alone, and the peak shift at (110) indicates the lattice changes Adv.…”

Section: Structural Analysismentioning

confidence: 90%

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

146

111

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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 Analysismentioning

confidence: 90%

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

146

111

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“…These structural changes are also supported by the evolution of (107) and (108) consistent with that observed previously [55,56], though with slightly wider phase coexistence ranges, probably due to the relatively low current rate applied to the in-situ cell during the in-situ experiment. Differences in the structural evolution as a function of applied current rate have already been observed in layered rock-salt materials [57] as well as in LiFePO4 [58].…”

Section: In-situ Structural Changes Of Licoo2mentioning

confidence: 91%

In-Situ Neutron Studies of Electrodes for Li-Ion Batteries Using a Deuterated Electrolyte: LiCoO₂as a Case Study

Dong

Biendicho

Hull

et al. 2018

J. Electrochem. Soc.

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Abstract.An electrochemical cell for in-situ neutron powder diffraction studies of electrode materials for lithium-ion batteries is presented. The device has a coin cell geometry, consisting of 8.4 cm diameter, circular components that can be stacked together and clamped tight using sixteen polyetheretherketone (PEEK) screws. The background issue associated with incoherent scattering from hydrogen within the organic electrolyte was addressed by replacing the normal electrolyte with a deuterated analogue, significantly improving the peak-to-background ratio of the in-situ neutron data. Initial in-situ studies showed clear structural evolution within LixCoO2 during charge in a half-cell with lithium metal as the counter electrode, in agreement with previous studies. In addition, the in-situ cell was shown to provide electrochemical performance comparable to that of equivalent coin cells of the commercial design and, following these demonstration studies, is available for in-situ structural studies of other lithium cathode and anode materials during charge/discharge cycling. 2 1. Introduction.

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“…47 Figure 4 shows the changes in lattice parameters c and a as functions of SOC (measured by coulomb counting and assuming that the SOC is uniform in this fresh cell) for charging and discharging at 2C and 5C and at 25…”

Section: Resultsmentioning

confidence: 99%

Simultaneous Operando Measurements of the Local Temperature, State of Charge, and Strain inside a Commercial Lithium-Ion Battery Pouch Cell

Feng

Ren

et al. 2018

J. Electrochem. Soc.

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A high energy X-ray diffraction technique is employed in a new way to make operando through-thickness measurements inside a large format commercial Li-ion pouch cell. The technique, which has a sub-mm in-plane spatial resolution, simultaneously determines the local temperature, the local state of charge of both electrodes (as opposed to the global average state of charge determined electrochemically), and the local in-plane elastic strain in the current collectors, all without embedding any intrusive sensors that alter battery behavior. As both thermal strain and mechanical strain develop during the charge-discharge cycling of the pouch cell, a novel approach developed herein makes it possible to separate them, allowing for measurement of the local temperature inside the battery. The operando experiment reveals that the temperature inside the cell is substantially higher than the external temperature. We propose that mechanical strain is due primarily to load transfer from the electrode to the current collector during lithiation, allowing determination of the local binder. Detailed local SOC mapping illustrates non-uniform degradation of the battery pouch cell. The possibility for 3D measurements is proposed. We believe that this new approach can provide critically needed data for validation of detailed models of processes inside commercial pouch cells. Today's electric vehicles generally use pouch cells rather than the more traditional cylindrical cells. An important advantage of pouch cells is their much higher surface-to-volume ratio for a given capacity, which permits better cooling. Batteries tend to heat up because of the hot environments that cars experience, internal electric resistance heating, and exothermic chemical reactions during operation. The performance of batteries fades over time, and high temperatures (say, above 45• C) greatly accelerate the fade rate 1,2 and may promote thermal runaway, 3 making temperature control critical. 4,5 Ideally, temperature control should be guided by the temperature inside the pouch cell, but making measurements inside an operating pouch cell has been difficult. Instead, the outside temperature has usually been taken as a surrogate for the internal temperature. [6][7][8] If pouch cells are sufficiently thin, and if the thermal conductivity is high enough, then it is reasonable to assume that the temperature measured at an x-y location on the outside of a pouch cell, with a thermocouple or with a thermal infrared (IR) camera, is close to the temperature at that x-y location all the way through its thickness. However, auto makers are motivated to make pouch cells thicker, reducing the number of expensive seals, electrical connections, and controls. Since local temperatures inside a thick cell might well be too high under some conditions, knowledge of the spatial distribution of internal temperature is of vital importance for achieving long life at low cost.A number of techniques have been developed to measure internal cell temperatures, 10-17 but measurement of loca...

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High‐Rate Charging Induced Intermediate Phases and Structural Changes of Layer‐Structured Cathode for Lithium‐Ion Batteries

Cited by 136 publications

References 42 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

In-Situ Neutron Studies of Electrodes for Li-Ion Batteries Using a Deuterated Electrolyte: LiCoO₂as a Case Study

Simultaneous Operando Measurements of the Local Temperature, State of Charge, and Strain inside a Commercial Lithium-Ion Battery Pouch Cell

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High‐Rate Charging Induced Intermediate Phases and Structural Changes of Layer‐Structured Cathode for Lithium‐Ion Batteries

Cited by 136 publications

References 42 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

In-Situ Neutron Studies of Electrodes for Li-Ion Batteries Using a Deuterated Electrolyte: LiCoO2as a Case Study

Simultaneous Operando Measurements of the Local Temperature, State of Charge, and Strain inside a Commercial Lithium-Ion Battery Pouch Cell

Contact Info

Product

Resources

About

In-Situ Neutron Studies of Electrodes for Li-Ion Batteries Using a Deuterated Electrolyte: LiCoO₂as a Case Study