Bulk and surface degradation in layered Ni-rich cathode for Li ions batteries: Defect proliferation via chain reaction mechanism

Yang, Chengkai; Shao, Ruiwen; Wang, Qian; Zhou, Tianyi; Lü, Jing; Jiang, Ning; Gao, Peng; Li, Wen; Yu, Yan; Zhou, Henghui

doi:10.1016/j.ensm.2020.11.016

Cited by 56 publications

(37 citation statements)

References 24 publications

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“…Figure j,k shows the TEM images and involved FFT patterns of NCA and 3 wt % NCA-Ta 2 O 5 after 200 cycles at 1C. Rock salt ( Fm 3̅ m ), amorphous and spinel ( Fd 3̅ m ) phases seen near the edge in the surface region of NCA suggest the fierce phase transformation. , In comparison, the 3 wt % NCA-Ta 2 O 5 retains the R 3̅ m layered structure after 200 cycles at 1C, showing superior structural and interfacial stability. The reason is that (1) the Ta 2 O 5 coating can effectively isolate the electrolyte and the material and reduce the side reactions; (2) Ta 2 O 5 can well resist the erosion of HF, so the material can maintain a perfect spherical shape after multiple charging and discharging processes; and (3) the Ta 2 O 5 coating and Ta 5+ doping can effectively inhibit the phase conversion from the layered phase to the spinel phase, thereby improving the cycle stability during long-term cycling.…”

Section: Results and Discussionmentioning

confidence: 99%

Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Zhang

Zeng

et al. 2021

ACS Appl. Energy Mater.

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The structural instability of high-nickel materials severely limits their commercial applications. In this article, a one-step high-temperature solid-phase sintering method is applied to form a Ta2O5 protective layer on the surface of LiNi0.8Co0.15Al0.05O2 (NCA) with Ta5+ entering the lattice, which achieves the double-effect of coating and doping. The Ta2O5 protective coating can inhibit the side reaction between the electrode material and electrolyte, and Ta5+ doping can relieve the Li+/Ni2+ disorder ratio. These significantly enhance the structural stability of NCA. The obtained NCA-Ta2O5 displays an excellent capacity retention rate (94.46%, at 1C after 200 cycles), which is much better than that (60.97%) of the pristine NCA. The exploration of structural evolution reveals that NCA-Ta2O5 can maintain a good spherical structure without obvious cracks after 200 cycles at 1C, while the original NCA has a serious structural collapse. Besides, NCA-Ta2O5 presents outstanding discharge capacity (151.02 mAh g–1 vs NCA: 131.70 mAh g–1) at a high rate of 10C. This work provides ideas for improving the performance of high-nickel materials, which is of great significance to the optimization of the cathode material for lithium-ion batteries.

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Section: Results and Discussionmentioning

confidence: 99%

Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Zhang

Zeng

et al. 2021

ACS Appl. Energy Mater.

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“…Second, electrochemical reactions at the electrolyte-cathode interfacial region consume surfaceactivated oxygen and promote bulk-to-surface oxygen migration. [26,27] Consequently, the thermal decomposition of delithiated LiTMO 2 can be advanced by tens of degrees Celsius in the presence of carbonate electrolytes. [25,28,29] As kinetic means for improving the structural stability of oxide cathodes against oxygen release, surface coatings, [30,31] and gradient concentration [32,33] particle design have been demonstrated to be effective in hindering interfacial reactions, thereby suppressing oxygen release.…”

Section: Introductionmentioning

confidence: 99%

Raising the Intrinsic Safety of Layered Oxide Cathodes by Surface Re‐Lithiation with LLZTO Garnet‐Type Solid Electrolytes

et al. 2022

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Battery safety concerns are becoming more and more prominent with the increasing demands of lithium‐ion batteries (LIBs) with higher energy density. The greatest threat to battery safety derives from the easy release of oxygen from the high‐capacity layered oxide cathodes at highly delithiated states and subsequent exothermic reactions with reductive agents in batteries. Herein, it is demonstrated that solid electrolyte Li6.5La3Zr1.5Ta0.5O12 (LLZTO) can supply lithium ions to re‐lithiate the charged LiCoO2 at elevated temperatures. Such a re‐lithiation process can lower the state‐of‐charge of LiCoO2, and thus, inherently postpones its structural decomposition and the associated release of oxygen during the heating process. The LiCoO2/graphite full cell with 1 wt% addition of LLZTO demonstrates remarkably enhanced safety performances. This work proposes a strategy that through the adoption of solid electrolytes to solve safety issues raised from both flammable liquid electrolytes and high capacity cathodes, to achieve intrinsically safe LIBs or solid‐state batteries.

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“…Ni‐rich cathode materials (LiNi x Co y Mn z O 2 , x ≥0.5) have been extensively investigated as a result of low cost and outstanding reversible capacity (>200 mAh g −1 ) [7] . However, They still suffer from many issues resulted from serious Ni 2+ /Li + mixing, parasitic side reactions, structural degradation, and dissolution of transition metal, which have confined their practical applications [8,9] . By contrast, LiNi 1/3 Co 1/3 Mn 1/3 O 2 with lower cation mixing and better structural stability is considered as the promising cathode materials [10,11] …”

Section: Introductionmentioning

confidence: 99%

Enhancing Rate Capacity and Cycle Stability of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Material by Laminar V₂O₅ Coating for Lithium‐Ion Batteries

Cheng

Nie

et al. 2021

ChemistrySelect

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The laminar V 2 O 5 -coated LiNi 1/3 Co 1/3 Mn 1/3 O 2 (NCM-V 2 O 5 ) was successfully synthesized via a facile wet-coating method using NH 4 VO 3 as the modifier precursor. The phase structure, microscopic morphologies, and element distribution of a thin V 2 O 5 layer were investigated by a serials of ex-situ characterization analysis. Subsequently, the phase changes of NCM-V 2 O 5 during first charge/discharge were researched by ex-situ (X-ray diffraction) XRD tests, which reveals the prominent structural stability. NCM-V 2 O 5 material shows an advanced rate performance due to elimination of surface lithium impurities, improve-ment of lithium-ions diffusion, and impedance reduction. Additionally, excellent cycling performance mainly relies on the alleviated parasitic side reactions at the electrode and electrolyte interface. Specifically, the NCM-V 2 O 5 retains 89.23 % capacity retention at 1 C after 100 cycles. What's more, NCM-V 2 O 5 delivers 131.3 (5 C) and 123.1 mAh g À 1 (10 C) capacity, and it achieves 88.65 % (5 C) and 88.22 % (10 C) capacity retention after 200 cycles. This work provides an effective guidance for the design of lithium-ion battery cathode materials with highrate performance.

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Bulk and surface degradation in layered Ni-rich cathode for Li ions batteries: Defect proliferation via chain reaction mechanism

Cited by 56 publications

References 24 publications

Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Raising the Intrinsic Safety of Layered Oxide Cathodes by Surface Re‐Lithiation with LLZTO Garnet‐Type Solid Electrolytes

Enhancing Rate Capacity and Cycle Stability of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Material by Laminar V₂O₅ Coating for Lithium‐Ion Batteries

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Bulk and surface degradation in layered Ni-rich cathode for Li ions batteries: Defect proliferation via chain reaction mechanism

Cited by 56 publications

References 24 publications

Improving the Structure Stability of LiNi0.8Co0.15Al0.05O2 by Double Modification of Tantalum Surface Coating and Doping

Improving the Structure Stability of LiNi0.8Co0.15Al0.05O2 by Double Modification of Tantalum Surface Coating and Doping

Raising the Intrinsic Safety of Layered Oxide Cathodes by Surface Re‐Lithiation with LLZTO Garnet‐Type Solid Electrolytes

Enhancing Rate Capacity and Cycle Stability of LiNi1/3Co1/3Mn1/3O2 Cathode Material by Laminar V2O5 Coating for Lithium‐Ion Batteries

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Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Improving the Structure Stability of LiNi_0.8Co_0.15Al_0.05O₂ by Double Modification of Tantalum Surface Coating and Doping

Enhancing Rate Capacity and Cycle Stability of LiNi_1/3Co_1/3Mn_1/3O₂ Cathode Material by Laminar V₂O₅ Coating for Lithium‐Ion Batteries