An integrated surface coating strategy to enhance the electrochemical performance of nickel-rich layered cathodes

Qu, Xingyu; Huang, He; Wan, Tao; Hu, Long; Yu, Zhenlu; Liu, Yunjian; Dou, Aichun; Zhou, Yu; Su, Mingru; Peng, Xiaoqi; Wu, Hong‐Hui; Wu, Tom; Chu, Dewei

doi:10.1016/j.nanoen.2021.106665

Cited by 214 publications

(96 citation statements)

References 63 publications

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“…There is little electron distribution between the Ti atom and nearby O atoms, implying the stronger chemical bonds of TiO than NiO. [20] The CDDs in Figure 4c reveal that the charge density between Ti and O is higher than that between Ni and O, reflecting that Ti doping can stabilize the O atoms in DC-TNO@SCNCM, [21] which agrees well with the aforementioned XPS results.…”

Section: Mechanism Of Surface-to-bulk Synergistic Modificationsupporting

confidence: 82%

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Sun

Song

Liu

et al. 2022

Advanced Energy Materials

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The interfacial stability between sulfide solid‐state electrolytes (SSEs) and high voltage Ni‐rich oxide cathodes is critical to the electrochemical performances of all‐solid‐state batteries (ASSBs), yet it is challenging to solve the interface issues by surface coating modification. Here, a surface‐to‐bulk synergistic modification is proposed to achieve a highly stable interface through the combination of TiNb2O7‐coated and Ti‐doped LiNi0.6Mn0.2Co0.2O2 single crystals (DC‐TNO@SCNCM). The TiNb2O7 coating layer with thermodynamic/electrochemical stability and electronic insulation avoids the decomposition of SSEs. The strong TiO bond in SCNCM achieved by Ti doping can stabilize lattice oxygen and avoid further electrochemically oxidizing sulfide electrolytes to form oxygenated sulfurous and phosphorous species. The modified DC‐TNO@SCNCM cathode exhibits excellent long‐cycle stability with a capacity retention rate of 92.2% after 140 cycles at a high cut‐off voltage of 4.4 V. This surface‐to‐bulk synergistic modification strategy provides a new perspective for the design of high‐voltage sulfide‐based ASSBs.

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Section: Mechanism Of Surface-to-bulk Synergistic Modificationsupporting

confidence: 82%

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Sun

Song

Liu

et al. 2022

Advanced Energy Materials

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“…Due to the deterioration of the environment, countries all over the world are emphasizing the development and utilization of renewable nonfossil energy. The global energy pattern is undergoing a fundamental change from relying on traditional fossil energy to embracing clean and efficient energy. − Energy storage devices with attractive capacity, extended life span, acceptable safety performance, and satisfying cost manifest the core unit urgently needed to implement the application of renewable energy, the construction of smart grids, and the development of electric vehicles. , Among them, the lithium-ion battery, an anticipated electrochemical energy storage technology, has entered the rapid development stage and shows great potential for applications to a new engine of energy power. − …”

Section: Introductionmentioning

confidence: 99%

“…1−3 Energy storage devices with attractive capacity, extended life span, acceptable safety performance, and satisfying cost manifest the core unit urgently needed to implement the application of renewable energy, the construction of smart grids, and the development of electric vehicles. 4,5 Among them, the lithium-ion battery, an anticipated electrochemical energy storage technology, has entered the rapid development stage and shows great potential for applications to a new engine of energy power. 6−8 The lithium iron phosphate (LFP) battery monopolizes the power battery market owing to its superb electrochemical traits.…”

Section: ■ Introductionmentioning

confidence: 99%

Direct Recycling Strategy for Spent Lithium Iron Phosphate Powder: an Efficient and Wastewater-Free Process

Gong

Peng

et al. 2022

ACS Sustainable Chem. Eng.

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Due to its high safety and long cyclic life, the LiFePO4 (LFP) battery has received numerous attention and has been widely used in electric vehicles. Therefore, it is urgent to develop advanced technology to recycle spent LFP batteries to avoid energy exhaustion and protect the environment. Here, we report a direct regeneration strategy for spent LFP powder based on the wet full-component leaching method and traditional LFP production process. Specifically, combined leaching of spent LFP powder using H3PO4 and citric acid was done; meanwhile, the leaching solution is used as the precursor to regenerate LFP cathode materials by a typical LFP spray-drying process. The recovery rates of Li, Fe, and P were above 95%. Effective separation of Al elements could be realized by pretreatment of LFP with a low concentration of LiOH solution, and the Al removal rate can reach 89%. The LFP material regenerated through prealuminum removal demonstrated excellent electrochemical properties, with a discharge capacity of 123.3 mA h g–1 at a rate of 5 C. After 600 cycles at 1 C, its capacity retention was found to be as high as 97.3%. Moreover, the economic benefit analysis indicates that the progress is rewarding. This novel and simple method has made a breakthrough in the limitations of traditional LFP-recovery process, eliminating the complicated chemical precipitation process. Meanwhile, it realizes the direct recovery of LFP and eliminates wastewater at the origin, which is expected to be widely used in industry.

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“…Surface coating materials such as Al 2 O 3 , MoO 3 , BiPO 4 , Li 2 WO 4 , Li 2 ZrO 3 , AlF 3 , LSTP, and LYTP can insulate active materials from the electrolyte and inhibit interface side reactions, thus improving cycle stability. However, a single doping or coating strategy cannot serve to alleviate the structural degradation of Ni-rich cathodes and simultaneously separate the active material from electrolyte corrosion. , The strategy of combining surface coating with element doping is considered to effectively improve the performance of nickel-rich cathodes. For instance, Huang et al reported nickel-rich cathode materials with Ti doping and Co 3 O 4 coating.…”

Section: Introductionmentioning

confidence: 99%

Combining Surface Holistic Ge Coating and Subsurface Mg Doping to Enhance the Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathodes

Tong

Zhao

et al. 2022

ACS Appl. Mater. Interfaces

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Nickel-rich layered cathode LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) is the most promising cathode material due to its high specific capacity and lower cost than lithium cobalt oxides. However, NCM811 suffers from structural instability and capacity degradation during charge−discharge cycles. Herein, we report a strategy to construct a conductive network by employing a holistic Ge coating, which interconnects Mg-doped NCM811 particles. Dopant Mg ions, serving as a "pillar" in the Li slab of NCM811, substantially enhance the structural reversibility. The Ge particles are not only coated on the electrode surface but also enter into the electrode pores to form a multidimensional conductive structure, which improves the conductivity of the electrode and slows down the interface side reaction, thus minimizing the irreversible loss of NCM811 upon long cycling. The modified NCM811 electrode delivers a high discharge capacity (∼204 mAh g −1 at 0.1C), excellent rate performance (∼155 mAh g −1 at 10C), and high capacity retention (83% after 200 cycles) even at 4.4 V. Additionally, a cylindrical full battery with graphite/modified NCM811 undergoes 1000 cycles with 86% capacity retention at 2C.

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An integrated surface coating strategy to enhance the electrochemical performance of nickel-rich layered cathodes

Cited by 214 publications

References 63 publications

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Direct Recycling Strategy for Spent Lithium Iron Phosphate Powder: an Efficient and Wastewater-Free Process

Combining Surface Holistic Ge Coating and Subsurface Mg Doping to Enhance the Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathodes

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An integrated surface coating strategy to enhance the electrochemical performance of nickel-rich layered cathodes

Cited by 214 publications

References 63 publications

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Surface‐to‐Bulk Synergistic Modification of Single Crystal Cathode Enables Stable Cycling of Sulfide‐Based All‐Solid‐State Batteries at 4.4 V

Direct Recycling Strategy for Spent Lithium Iron Phosphate Powder: an Efficient and Wastewater-Free Process

Combining Surface Holistic Ge Coating and Subsurface Mg Doping to Enhance the Electrochemical Performance of LiNi0.8Co0.1Mn0.1O2 Cathodes

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Combining Surface Holistic Ge Coating and Subsurface Mg Doping to Enhance the Electrochemical Performance of LiNi_0.8Co_0.1Mn_0.1O₂ Cathodes