Improving the cycling performance of LiNi0.8Co0.1Mn0.1O2 by surface coating with Li2TiO3

Meng, Kui; Wang, Zhixing; Guo, Huajun; Li, Xinhai; Wang, Ding

doi:10.1016/j.electacta.2016.06.110

Cited by 172 publications

(77 citation statements)

References 28 publications

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“…7, the around 5% of anisotropic contraction and the ~3.9% of average contraction (Fig. 6h) in the nanodomain would cause the contraction of each primary particle, and then the gaps between the primary particles would result in the micro-crack generations in the secondary particles on the interfaces between the primary particles, which could be the origins and mechanism on the experimental observations of the micro-crack propagations2526272829. Further, the heterogeneous distribution of the anisotropic strain changes causes the severe mechanical instability of the primary particles that could induce the generation of nano-cracks, which could be a crack opening of the micro-cracks.…”

Section: Resultsmentioning

confidence: 95%

“…reported that the severe crack generation in NCM811 particles induces a significant performance degradation29. According to the scanning electron microscopy (SEM) observation, particle fractures and fragmentation of NCM811 particles were evident after cycles.…”

Section: Resultsmentioning

confidence: 99%

“…Although, Meng et al . recently reported the experimental observation of micro-crack generation of NCM811 with severe cyclic degradation and suggested surface coating with Li 2 TiO 3 to mitigate the crack propagation29, the fundamental origin has not been adequately addressed for the Ni-rich NCM cathodes1. Moreover, the underlying mechanism for the phase transformation and structural changes in NCM811 is not fully understood.…”

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confidence: 99%

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Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Lim

Hwang

Kim

et al. 2017

Sci Rep

246

162

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Ni-rich LiNi0.8Co0.1Mn0.1O2 layered oxide cathodes have been highlighted for large-scale energy applications due to their high energy density. Although its specific capacity is enhanced at higher voltages as Ni ratio increases, its structural degradation due to phase transformations and lattice distortions during cycling becomes severe. For these reasons, we focused on the origins of crack generation from phase transformations and structural distortions in Ni-rich LiNi0.8Co0.1Mn0.1O2 using multiscale approaches, from first-principles to meso-scale phase-field model. Atomic-scale structure analysis demonstrated that opposite changes in the lattice parameters are observed until the inverse Li content x = 0.75; then, structure collapses due to complete extraction of Li from between transition metal layers. Combined-phase investigations represent the highest phase barrier and steepest chemical potential after x = 0.75, leading to phase transformations to highly Li-deficient phases with an inactive character. Abrupt phase transformations with heterogeneous structural collapse after x = 0.81 (~220 mAh g−1) were identified in the nanodomain. Further, meso-scale strain distributions show around 5% of anisotropic contraction with lower critical energy release rates, which cause not only micro-crack generations of secondary particles on the interfaces between the contracted primary particles, but also mechanical instability of primary particles from heterogeneous strain changes.

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Section: Resultsmentioning

confidence: 95%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Lim

Hwang

Kim

et al. 2017

Sci Rep

246

162

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“…The magnified image in Figure d clearly gives the lattice fringes of 0.21 nm which correspond to the (112) plane of LiAlO 2 . The LiAlO 2 layer would serve as a protection layer and improve the structural stability and thus cycling performance of electrode materials . However, we didn't observe the presence of the lattice fringes of Li 5 AlO 4 phase which could be due to its little amount.…”

Section: Resultsmentioning

confidence: 66%

“…The LiAlO 2 layer would serve as a protection layer and improve the structural stability and thus cycling performance of electrode materials. [26] However, we didn't observe the presence of the lattice fringes of Li 5 AlO 4 phase which could be due to its little amount. Figure 5 shows the Ni 2p 3/2 , Co 2p, Mn 2p 3/2 and Al 2p XPS spectra of S 0 , S 1 , S 2 and S 3 .…”

Section: Structure and Morphology Of Ncm And Lithium Aluminates Modifmentioning

confidence: 64%

Improvement of Electrochemical Performance of Nickel Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode by Lithium Aluminates Surface Modifications

Tan

Zhang

et al. 2018

Energy Tech

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Ni‐rich layered compounds are very promising cathodes for lithium ion batteries whose surface modifications are normally required. As excellent lithium‐conducting solid electrolytes lithium aluminates such as LiAlO2 are expected to have an important role to play as a candidate for surface modifications. Here, Ni‐rich layered LiNi0.8Co0.1Mn0.1O2 (NCM) coated by lithium aluminates with different nominal weight percentages was prepared using a sol‐gel method. Lithium aluminates are found to be a mixture of major LiAlO2 and minor Li5AlO4. The coatings almost have no influence on the size and morphology of NCM particles, and however favor the order degree of structure and change the surface states. The electrical conductivity and charge transfer resistance can be optimized by controlling the amount of lithium aluminates. The cycling stability at low rates such as 1 C tends to increase with the amount of lithium aluminates whereas the rate capability can be achieved at certain amount, which is probably related to the enhancement of electrical conductivity and the improved surface protection against the erosion by electrolyte. This study reveals that the performances of NCM can be significantly improved and tailored by controlling the amount of lithium aluminates.

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Surface Chemistry of Alkali‐Ion Battery Cathode Materials

Rahman

Lin

2019

Encyclopedia of Inorganic and Bioinorganic Chemistry

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Layered and spinel transition metal oxides are one of the most technologically important cathode materials for alkali metal ion batteries because of their high energy/power density and excellent electrochemical reversibility. However, similar to many other cathode materials, unstable electrochemical performance on long‐term cycling impacts the cycle life of batteries. Some of the challenges are transition metal dissolution, electrolyte decomposition, surface reconstruction, and chemomechanical breakdown of cathode materials. Most of these degradation phenomena originate from the surface of cathode materials. Owing to different local chemical environments, the surface chemistry of a cathode is distinctively unique from that of the bulk. Even though the surface region of a battery particle only accounts for a small fraction of the entire particle and contributes marginally to the overall capacity, surface‐related chemical and structural transformations can be the major factors in governing the degradation pathway of a cathode material. Herein, we have mechanistically discussed the origin and propagation of these degradation phenomena and their implications in the cycle life of a battery. Moreover, the techniques that mitigate and prevent these degradation pathways are explained. A complete understanding of the instability issues can promote a rational design of stable cathode materials for alkali metal ion batteries.

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Improving the cycling performance of LiNi0.8Co0.1Mn0.1O2 by surface coating with Li2TiO3

Cited by 172 publications

References 28 publications

Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Improvement of Electrochemical Performance of Nickel Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode by Lithium Aluminates Surface Modifications

Surface Chemistry of Alkali‐Ion Battery Cathode Materials

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Improving the cycling performance of LiNi0.8Co0.1Mn0.1O2 by surface coating with Li2TiO3

Cited by 172 publications

References 28 publications

Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Intrinsic Origins of Crack Generation in Ni-rich LiNi0.8Co0.1Mn0.1O2 Layered Oxide Cathode Material

Improvement of Electrochemical Performance of Nickel Rich LiNi0.8Co0.1Mn0.1O2 Cathode by Lithium Aluminates Surface Modifications

Surface Chemistry of Alkali‐Ion Battery Cathode Materials

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Improvement of Electrochemical Performance of Nickel Rich LiNi_0.8Co_0.1Mn_0.1O₂ Cathode by Lithium Aluminates Surface Modifications