Optimizing the structure of layered cathode material for higher electrochemical performance by elucidating structural evolution during heat processing

Huang, Zhongyuan; Chu, Mihai; Wang, Rui; Zhu, Weiming; Zhao, Wenguang; Wang, Chaoqi; Zhang, Yanjun; He, Lunhua; Chen, Jie; Deng, Sihao; Mei, Longwei; Kan, Wang Hay; Avdeev, Maxim; Pan, Feng; Xiao, Yinguo

doi:10.1016/j.nanoen.2020.105194

Cited by 22 publications

(8 citation statements)

References 39 publications

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“…At temperatures >500 °C (stage IV), there was almost no weight loss from the LiNi 0.8 Co 0.15 Al 0.05 O 2 material under the oxygen atmosphere, in contrast to a weight loss of ∼2% at 700 °C under the air atmosphere, attributable to lattice oxygen loss . These results indicate that the relatively low oxygen pressure in air did not prevent the weight loss caused by oxygen loss, whereas in the nitrogen atmosphere, the material continued to lose weight due to the volatilization of lithium salt and oxygen loss at the high temperature. , …”

Section: Results and Discussionmentioning

confidence: 91%

“…30 These results indicate that the relatively low oxygen pressure in air did not prevent the weight loss caused by oxygen loss, whereas in the nitrogen atmosphere, the material continued to lose weight due to the volatilization of lithium salt and oxygen loss at the high temperature. 17,31 The influence of different atmospheres on the crystal structures of the final products and the oxidation of Ni was also explored and discussed in Figures S3 and S4. Based on the above conclusion, an adequate oxygen pressure was shown to play a significant role in the synthesis of LiNi 0.8 Co 0.15 Al 0.05 O 2 , as shown in eq 1.…”

Section: Resultsmentioning

confidence: 99%

“…The presence of Ni 2+ in the Li layer not only impedes the Li + diffusion but also results in irreversible capacity and performance degradation after long cycles . To ensure that Ni 2+ can be oxidized to Ni 3+ and reduce Li + /Ni 2+ cation mixing, Ni-rich cathode materials usually need to be calcined at high temperatures (750–800 °C). , However, high temperatures will cause the loss of lattice oxygen, resulting in oxygen vacancies and the reduction of Ni 3+ , , which will aggravate Li + /Ni 2+ cation mixing. Besides, oxygen vacancies have strong oxidizing property, which can not only boost the decomposition of the electrolyte but also promote the migration of transition metal to the Li layers .…”

Section: Introductionmentioning

confidence: 99%

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Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Xiao

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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Ni-rich cathode materials are a low-cost and high-energy density solution for high-power lithium-ion batteries. However, Li+/Ni2+ cation mixing and oxygen vacancies are inevitably formed during the high-temperature calcination process, resulting in a poor crystal structure that adversely affects the electrochemical performance. In this work, the LiNi0.8Co0.15Al0.05O2 cathode material with a regular crystal structure was prepared through oxygen pressurization during lithiation–calcination, which effectively solved the problems caused by the high calcination temperature, such as oxygen loss and a reduction of Ni3+. The co-effect of oxygen pressure and calcination temperature on the properties of Ni-rich materials was systematically explored. Oxygen pressurization increased the redox conversion temperature, thus promoting the oxidation of Ni2+ and reducing Li+/Ni2+ cation mixing. Moreover, due to the strong oxidizing environment provided by the elevated calcination temperature and oxygen pressurization, the LiNi0.8Co0.15Al0.05O2 material synthesized under 0.4 MPa oxygen pressure and a calcination temperature of 775 °C exhibited few oxygen vacancies, which in turn suppressed the formation of microcracks during the electrochemical cycling. An additional feature of the LiNi0.8Co0.15Al0.05O2 material was the small specific surface area of the particles, which reduced both the contact area with the electrolyte and side reactions. As a result, the LiNi0.8Co0.15Al0.05O2 material exhibited remarkable electrochemical performance, with an initial discharge capacity of 191.6 mA h·g–1 at 0.1 C and a capacity retention of 94.5% at 0.2 C after 100 cycles.

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Section: Results and Discussionmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Xiao

Chen

et al. 2022

ACS Appl. Mater. Interfaces

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“…[30][31][32][33] Due to various structural advantages, such as high specific surface areas, tunable nanostructures, and excellent porosity, MOFs have been applied as suitable starting materials for preparing transition metal-based NPs and SAs doped catalysts in the fields of electro/photocatalysis, battery, and nanomedicine. [34][35][36][37][38][39][40][41][42] For instance, in our previous work, the MOF coating was utilized to obtain abundant atomic Fe-N x active sites on open-mesoporous carbon nanofiber for efficient oxygen electrode. [43] In another recent publication, Li and co-workers reported the core-shell bimetallic ZIF-8@ZIF-67-derived nanocrystalline CoP doped into N-doped carbon nanotube (CNT) for high-efficiency overall water splitting.…”

Section: Introductionmentioning

confidence: 99%

Transition Metal and Metal–N_x Codoped MOF‐Derived Fenton‐Like Catalysts: A Comparative Study on Single Atoms and Nanoparticles

Gao

Yang

Zhou

et al. 2020

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critical study topic in building structurereactivity correlations in broad catalytic research fields. [1-2] Especially, single-atom catalysts have emerged as a new research frontier in both energy and environmental sciences, featuring with atomically dispersed active sites and characteristic electronic properties. [3-11] On the other hand, water contaminations caused by toxic benzene-derived compounds, such as endocrine disruptors from the plastics industry, dyestuff pollution, and antibiotic used in the cultivation industry, have led to an enormous threat to the environment and human health. [12-16] In recent years, the peroxymonosulfate (PMS)-based Fenton-like catalytic oxidation process has been regarded as a clean approach to generating reactive oxygen species (ROS), which presents a promising potential to overcome the ever-growing pollutants in water systems resulted from the toxic benzene-derived compounds. [17-21] However, it is very hard to activate PMS to generate sufficient radicals to degrade water pollutants efficiently, which thus hinders the practical applications of PMS in the Fenton-like oxidation reactions. [22-24] To deal with these issues, abundant transition metal-based catalysts have been studied as for PMS-based Fenton-like oxidation To deal with the ever-growing toxic benzene-derived compounds in the water system, extensive efforts have been dedicated for catalytic degradation of pollutants. However, the activities and efficiencies of the transition metal-based nanoparticles or single-atom sites are still ambiguous in Fenton-like reactions. Herein, to compare the Fenton-like catalytic efficiencies of the nanoparticles and single atoms, the free-standing nanofibrous catalyst comprising Co nanocrystals and CoN x codoped carbon nanotubes (CNTs) or bare CoN x doped CNTs is fabricated. It is noteworthy that all these nanofibrous catalysts exhibit efficient activities, mesoporous structures, and conductive carbon networks, which allow a feasible validation of the catalytic effects. Benefiting from the maximized atomic utilization, the atomic CoN x centers exhibit much higher reaction kinetic constant (κ = 0.157 min −1) and mass activity toward the degradation of bisphenol A, far exceeding the Co nanocrystals (κ = 0.082 min −1). However, for the volume activities, the single-atom catalyst does not show apparent advantages compared to the nanocrystal-based catalyst. Overall, this work not only provides a viable pathway for comparing Fenton-like catalytic effects of transition metal-based nanoparticles or single atoms but also opens up a new avenue for developing prominent catalysts for organic pollutants' degradation. The ORCID identification number(s) for the author(s) of this article can be found under

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“…277 Some researchers believe that in situ NPD is the preferred method for tracking structural changes and Li/O element content in LIB electrode materials during heat treatment. 278…”

Section: Advanced In Situ Characterization Methods For Investigating ...mentioning

confidence: 99%

Fundamentals, status and challenges of direct recycling technologies for lithium ion batteries

Ji,

Wang,

et al. 2023

Chem. Soc. Rev.

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Optimizing the structure of layered cathode material for higher electrochemical performance by elucidating structural evolution during heat processing

Cited by 22 publications

References 39 publications

Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Transition Metal and Metal–N_x Codoped MOF‐Derived Fenton‐Like Catalysts: A Comparative Study on Single Atoms and Nanoparticles

Fundamentals, status and challenges of direct recycling technologies for lithium ion batteries

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Optimizing the structure of layered cathode material for higher electrochemical performance by elucidating structural evolution during heat processing

Cited by 22 publications

References 39 publications

Effects of Oxygen Pressurization on Li+/Ni2+ Cation Mixing and the Oxygen Vacancies of LiNi0.8Co0.15Al0.05O2 Cathode Materials

Effects of Oxygen Pressurization on Li+/Ni2+ Cation Mixing and the Oxygen Vacancies of LiNi0.8Co0.15Al0.05O2 Cathode Materials

Transition Metal and Metal–Nx Codoped MOF‐Derived Fenton‐Like Catalysts: A Comparative Study on Single Atoms and Nanoparticles

Fundamentals, status and challenges of direct recycling technologies for lithium ion batteries

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Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Effects of Oxygen Pressurization on Li⁺/Ni²⁺ Cation Mixing and the Oxygen Vacancies of LiNi_0.8Co_0.15Al_0.05O₂ Cathode Materials

Transition Metal and Metal–N_x Codoped MOF‐Derived Fenton‐Like Catalysts: A Comparative Study on Single Atoms and Nanoparticles