There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

High-voltage lithium-ion batteries (HVLIBs) are considered as promising devices of energy storage for electric vehicle, hybrid electric vehicle, and other high-power equipment. HVLIBs require their own platform voltages to be higher than 4.5 V on charge. Lithium nickel manganese spinel LiNi0.5Mn1.5O4 (LNMO) cathode is the most promising candidate among the 5 V cathode materials for HVLIBs due to its flat plateau at 4.7 V. However, the degradation of cyclic performance is very serious when LNMO cathode operates over 4.2 V. In this review, we summarize some methods for enhancing the cycling stability of LNMO cathodes in lithium-ion batteries, including doping, cathode surface coating, electrolyte modifying, and other methods. We also discuss the advantages and disadvantages of different methods.

/pdf/research-progress-in-improving-the-cycling-stability-of-high-42buv5xff5.pdf

Research Progress in Improving the Cycling Stability of High-Voltage LiNi0.5Mn1.5O4 Cathode in Lithium-Ion Battery.

Lithium ion batteries are receiving enormous attention as power sources and energy storage devices in the renewable energy field. With the ever increasing demand for higher energy and power density, high voltage cathodes have emerged as an important option for new generation batteries. Here, we report graphene-oxide-coated LiNi0.5Mn1.5O4 as a high voltage cathode and demonstrate that the batteries showed superior cycling performance for up to 1000 cycles. Mildly oxidized graphene oxide coating was found to improve the battery performance by enhancing the conductivity and protecting the cathode surface from undesired reactions with the electrolyte. As a result, the graphene-oxide-coated high voltage cathode LiNi0.5Mn1.5O4 showed 61% capacity retention after 1000 cycles in the cycling test, which converts to only 0.039% capacity decay per cycle. At large current rates of 5 C, 7 C and 10 C, the batteries were able to deliver 77%, 66% and 56% of the 1 C capacity, respectively (1 C = 140 mA g−1). In contrast, the LiNi0.5Mn1.5O4 cathode without graphene oxide coating showed 88.7% capacity retention after only 100 cycles. The promising results demonstrated the potential of developing high energy density batteries with the high voltage cathode LiNi0.5Mn1.5O4 and improving the battery performance by surface modification with mildly oxidized graphene oxide.

Graphene-Oxide-Coated LiNi0.5Mn1.5O4 As High Voltage Cathode for Lithium Ion Batteries With High Energy Density and Long Cycle Life

Syntheses and electrochemical properties of the Na-doped LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries

Insertion compounds have been dominating the cathodes in commercial lithium-ion batteries. In contrast to layered oxides and polyanion compounds, the development of spinel-structured cathodes is a little behind. Owing to a series of advantageous properties, such as high operating voltage (≈4.7 V), high capacity (≈135 mAh g-1 ), low environmental impact, and low fabrication cost, the high-voltage spinel LiNi0.5 Mn1.5 O4 represents a high-power cathode for advancing high-energy-density Li+ -ion batteries. However, the wide application and commercialization of this cathode are hampered by its poor cycling performance. Recent progress in both the fundamental understanding of the degradation mechanism and the exploration of strategies to enhance the cycling stability of high-voltage spinel cathodes have drawn continuous attention toward this promising insertion cathode. In this review article, the structure-property correlations and the failure mode of high-voltage spinel cathodes are first discussed. Then, the recent advances in mitigating the cycling stability issue of high-voltage spinel cathodes are summarized, including the various approaches of structural design, doping, surface coating, and electrolyte modification. Finally, future perspectives and research directions are put forward, aiming at providing insightful information for the development of practical high-voltage spinel cathodes.

Advances and Prospects of High-Voltage Spinel Cathodes for Lithium-Based Batteries

High power and capacity of LiNi0.5Mn1.5O4 thin films cathodes prepared by pulsed laser deposition

High-stability 5 V spinel LiNi0.5Mn1.5O4 sputtered thin film electrodes by modifying with aluminium oxide

Highly ordered ZnO nanohole arrays: Fabrication and enhanced two-photon absorption

Lithium secondary batteries using LiNi0.5Mn1.5O4 (LNMO) films as a cathode material were prepared by pulsed laser deposition on stainless steel substrates. X-ray diffraction and Field-emission Scanning Electron Microscope results show that the film deposited at 750°C exhibits good crystallinity with well-defined grains structure. Galvanostatic charge/discharge measurement results revealed that the reversible capacity maintains 116.8mAhg-1 after 100 cycles at 0.5C. It also exhibits excellent rate capability, as the rates increase to 5 and 10 C, about 95.4% and 92.3% of its initial capacity at 0.2C can be retained. In additional, thermal stability of the Al2O3 coated LNMO thin film cathodes were also explored. The high temperature cyclic performance of LNMO thin film electrode was significantly enhanced by the coating.

Excellent Electrochemical Performance and Thermal Stability of LiNi0.5Mn1.5O4 Thin-Film Cathode Prepared by Pulsed Laser Deposition

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Yan Wang

Author Tools

Chat about Author

Papers

High power and capacity of LiNi0.5Mn1.5O4 thin films cathodes prepared by pulsed laser deposition

High-stability 5 V spinel LiNi0.5Mn1.5O4 sputtered thin film electrodes by modifying with aluminium oxide

Highly ordered ZnO nanohole arrays: Fabrication and enhanced two-photon absorption

Excellent Electrochemical Performance and Thermal Stability of LiNi0.5Mn1.5O4 Thin-Film Cathode Prepared by Pulsed Laser Deposition