Studies on stability and capacity for long-life cycle performance of Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 by Mo modification for lithium-ion battery

Zhang, Yin; Wang, Zhen‐Bo; Yu, Fu‐Da; Que, Lan‐Fang; Xia, Yunfei; Xue, Yongqiang; Wu, Jiangtao

doi:10.1016/j.jpowsour.2017.05.013

Cited by 136 publications

(93 citation statements)

References 64 publications

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“…Thus, XPS spectra of Ni 2p 3/2 were acquired for each electrode to after long‐term cycling. The Ni 2p 3/2 peak can be deconvoluted into a Ni 2+ peak at 854.3 eV and Ni 3+ peak at 855.8 eV, respectively . Therefore, both Ni 2p 3/2 spectra of fresh bare NCM [Figure (a)] and TiO 2 ‐PNCM electrodes [Figure (b)] show Ni 2+ and Ni 3+ peaks with no clear differences.…”

Section: Resultsmentioning

confidence: 96%

Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

et al. 2019

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Ni‐rich layered oxides are promising cathode materials for developing high‐energy lithium‐ion batteries. To overcome the major challenge of surface degradation, a TiO2 surface coating based on polydopamine (PDA) modification was investigated in this study. The PDA precoating layer had abundant OH catechol groups, which attracted Ti(OEt)4 molecules in ethanol solvent and contributed towards obtaining a uniform TiO2 nanolayer after calcination. Owing to the uniform coating of the TiO2 nanolayer, TiO2‐coated PDA‐LiNi0.6Co0.2Mn0.2O2 (TiO2‐PNCM) displayed an excellent electrochemical stability during cycling under high voltage (3.0–4.5 V vs. Li+/Li), during which the cathode material undergoes a highly oxidative charge process. In addition, TiO2‐PNCM exhibited excellent cyclability at elevated temperature (60 °C) compared with the bare NCM. The surface degradation of the Ni‐rich cathode material, which is accelerated under harsh cycling conditions, was effectively suppressed after the formation of an ultra‐thin TiO2 coating layer.

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Section: Resultsmentioning

confidence: 96%

Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

et al. 2019

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“…It is clear from the Fig. 5(a),(b), polarization decreases after certain amount of Mo-modifying the NCM material but later on the excess Mo increase the polarization like in the case of Mo-3 and Mo-5 29 . Among all the samples, Mo-1 shows the highest specific capacity due to the higher material utilization and fast electrode kinetics 43 .…”

Section: Resultsmentioning

confidence: 81%

“…In addition, this can also decreases the lithium diffusion distances which can improve the de/intercalation for the lithium ion, resulting in excellent cyclability 13 . Internal stresses can grow-up during doping which can destroy the particles while the Mo-modified samples maintain their shape in the current work 29,41 . Moreover, it is interesting that as the amount of Mo is increased the surfaces ( Fig.…”

Section: Resultsmentioning

confidence: 90%

“…Moreover, it is interesting that as the amount of Mo is increased the surfaces ( Fig. 3(d),(f),(h)) of primary particles are more like wetted and fused, because the Mo is too much to insert into the interior of crystal structure so the remaining Mo is also coated as well 29,31 . EDS mapping of Mo-1 was carried out to check the distribution of Mo in the sample.…”

Section: Resultsmentioning

confidence: 99%

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Influence of Mo addition on the structural and electrochemical performance of Ni-rich cathode material for lithium-ion batteries

Sattar

Lee

Jin

et al. 2020

Sci Rep

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Molybdenum modified LiNi 0.84 Co 0.11 Mn 0.05 o 2 cathode with different doping concentrations (0-5 wt.%) is successfully prepared and its electrochemical performances are investigated. It is demonstrated that molybdenum in LiNi 0.84 Co 0.11 Mn 0.05 o 2 has a positive effect on structural stability and extraordinary electrochemical performances, including improved long-term cycling and high-rate capability. Among all samples, the 1 wt. % molybdenum LiNi 0.84 Co 0.11 Mn 0.05 o 2 delivers superior initial discharge capacity of 205 mAh g −1 (0.1 C), cycling stability of 89.5% (0.5 C) and rate capability of 165 mAh g −1 (2 C) compared to those of others. Therefore, we can conclude that the 1 wt. % molybdenum is an effective strategy for Ni-rich LiNi 0.84 Co 0.11 Mn 0.05 o 2 cathode used in lithium ion batteries. Recently, the most widely used energy storage device is Lithium ion battery (LIB) due to its high energy density being able to fulfill the continuous demand for reducing the environmental impact and cost of electric vehicles and portable electronic devices 1-4. For the cathode that determines the battery's performance, a new family of cathode material; LiNi x Co y Mn z O 2 (NCM) has attracted a lot of attention for the commercial applications 5,6. NCM cathode possesses a complex cation arrangement which can be optimized to enhance cycle life, power density and thermal stability compared to traditional cathodes. Among the family of NCM cathodes, recent research efforts have been focused on Ni-rich (Ni≥80%) NCM cathodes because the increased Ni content brings low costs, high discharge capacity and energy density 7,8. However, the low content of Co and Mn in Ni-rich NCM has a negative impact due to the thermally instability and cation mixing. It is reported that the delithiated Ni-rich cathode would undergo a phase transformation from layered to rock-salt during cycling which is closely related to the cation mixing 9-11. Cation mixing is caused by the auto-reduction of Ni 3+ to Ni 2+ which causes the collapse in the local structure due to which the Ni 2+ migrates from transition metal slab to the lithium slab 12,13. Also, Ni 3+/4+ t 2g band overlaps with oxygen 2p band, that's why high delithiation might result in the removal of electron from oxygen 2p band which causes the oxidation of O 2and eventually loss of oxygen from the lattice 14,15. A lot of techniques has been employed in order to suppress the cation mixing and improves the thermal stability and capacity. Coatings and doping are used to enhance the structural stability and electrochemical performance. Coatings of TiO 2 16

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“…[3,8,9] The migration of Ni 2 + into Li + sites, which would block the lithium ion diffusion and deteriorate the structural stability, is one of the reasons for capacity fading of Ni-rich cathode materials. Meanwhile, the excess Li ions lead to the formation of surface impurities such as Li 2 CO 3 and LiOH, which would increase the risk of gas evolution due to the reactions with electrolyte [10,11] Various approaches have been adopted to address these issues including use of new synthesis routes and surface modifications, such as element doping [12,13] , and structure design. [14] Surface modification is one of the widely used methods, which can suppress the side reactions between Ni-rich layered compounds and electrolyte, and improve the structural stability.…”

Section: Introductionmentioning

confidence: 99%

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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Studies on stability and capacity for long-life cycle performance of Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 by Mo modification for lithium-ion battery

Cited by 136 publications

References 64 publications

Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

Influence of Mo addition on the structural and electrochemical performance of Ni-rich cathode material for lithium-ion batteries

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

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Studies on stability and capacity for long-life cycle performance of Li(Ni 0.5 Co 0.2 Mn 0.3 )O 2 by Mo modification for lithium-ion battery

Cited by 136 publications

References 64 publications

Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

Selective TiO2 Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

Influence of Mo addition on the structural and electrochemical performance of Ni-rich cathode material for lithium-ion batteries

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

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Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

Selective TiO₂ Nanolayer Coating by Polydopamine Modification for Highly Stable Ni‐Rich Layered Oxides

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