In recent years, domestic and international researchers have been committed to the research of lithium-ion batteries. As the key to further improving the performance of the battery, the quality of the cathode material directly affects the performance indicators of the lithium battery; thus, the cathode material occupies the core position in the lithium-ion battery. LiFePO4 is a relatively excellent material for lithium-ion batteries, which has many advantages of low cost, high capacity, and environmental friendliness. However, as a result of the low conductivity of lithium iron phosphate and the slow diffusion rate of lithium ion, the development of lithium iron phosphate in the power battery industry is restricted. As a power battery applied in real life, there is still a lot of research space in energy density, consistency, and low-temperature performance. After years of efforts, researchers continue to explore the charging and discharging principle of lithium iron phosphate, to optimize the synthesis route, and to try coating, doping modification, and other methods to improve the performance of the material. This paper analyzes and summarizes the defects of lithium iron phosphate cathode materials and modification methods and provides an outlook on the future research direction of lithium iron phosphate. 

Review on Defects and Modification Methods of LiFePO4 Cathode Material for Lithium-Ion Batteries

Rechargeable lithium-ion batteries are dominating the energy storage market with a current market value of $50 billion. However, the exponential production of lithium-ion batteries is accompanied by an increased backflow as environmentally hazardous spent/end-of-life batteries, which need to be recycled efficiently. Herein, we demonstrate the possibility of reuse, recycle, and regeneration of a spent LiFePO₄ (LFP) cathode for rechargeable lithium- and sodium-ion batteries. An approach of reusing the spent-LFP electrode in developing a new lithium-ion battery was initially explored. The refabricated LFP lithium-ion half-cells delivered excellent capacity and rate capability. Further, an unprecedented approach of using a spent-LFP electrode for sodium ion storage was investigated. The adopted low-temperature, rapid (15 min) microwave delithiation process could completely delithiate the LFP electrode, forming FePO₄. This recycled FePO₄ was tested for its sodium ion storage capability. Finally, an aspect of commercially viable, nearly zero-energy chemical lithiation/sodiation of microwave-derived FePO₄ was also explored. Thus, regenerated LiFePO₄ as lithium-ion half-cells exhibited a reversible capacity of 145 mAh/g at a current rate of 1C and 107 mAh/g at 10C and 96% capacity retention at 5C for 300 cycles. Similarly, the chemically sodiated FePO₄ sodium-ion cell demonstrated a capacity close to 138 mAh/g at C/15, which is comparable to freshly prepared NaFePO₄ (NFP) electrode’s performances. Our electrochemical results confirm the potential of these rapid, sustainable, and energy-efficient methods for reutilization, recycling, and regeneration of failed LFP cathodes recovered from 32 650 cells for their proficient usage in both lithium- and sodium-ion storage.

Reuse, Recycle, and Regeneration of LiFePO4 Cathode from Spent Lithium-Ion Batteries for Rechargeable Lithium- and Sodium-Ion Batteries

The strong interaction and confinement effect of Ag@NH2-MIL-88B for improving the conversion and durability of photocatalytic Cr(VI) reduction in the presence of a hole scavenger.

Low-Cost Polyanion-Type Sulfate Cathode for Sodium-Ion Battery

Ni-doped LiFePO4/C as high-performance cathode composites for Li-ion batteries

Electrochemical performance of in situ LiFePO4 modified by N-doped graphene for Li-ion batteries

Although researchers have previously examined whether graphene modified by sulfur can improve the electrochemical performance of LiFePO4/C composites, they have rarely examined whether it can do so during the synchronous synthesis of LiFePO4/C and sulfur-modified reduced graphene oxide (SG) via a one-step hydrothermal method. To answer this question, a series of olivine structure LiFePO4/C composites wrapped with SG were investigated. Subsequently, we found that SG can form a three-dimensional conductive network on the surface of the LiFePO4/C sample. In the process, XRD and HRTEM tests were undertaken as well. From the XRD test, the results show that SG does not affect the olivine structure of LiFePO4/C. In the HRTEM experiment, clear lattice fringes and a uniformly coated carbon layer on the sample surface were observed. Alongside these results, there were 4 others. First, the charge–discharge data showed that the electrochemical performance of the samples could be increased by SG modification. Second, sample S2 with a mass ratio of Na2S to rGO of 1:10 shows the best specific discharge capacity and stability. Third, the specific capacity of S2 is 163 mAhg−1 at 0.2 C, and the capacity retention is 108.23% even after 200 cycles at a magnification of 10 C. Fourth, according to EIS, the charge migrating resistance of S2 is 226.4 Ω, and the lithium-ion diffusion coefficient is 2.41 × 10−14 cm2·S−1. The significance of these results is that they indicate that wrapping LiFePO4/C with SG significantly contributed to the improvement of its electrochemical performance.

Enhanced electrochemical performance of LiFePO4/C wrapped with sulfur-modified reduced graphene oxide for Li-ion batteries

A series of LiFe1−xMnxPO4/C composites were successfully synthesized through a simple hydrothermal method. The effects of doped Mn on their micro-structures and electrochemical performances were investigated. The XRD results indicate that Mn doping cannot change the olivine lattice type of LiFePO4. Appropriate Mn doping can reduce the particle size of LiFePO4. The electrochemical performance data show that the electrochemical performances of the composite materials are enhanced at first and then decrease as the doping amount of Mn increases. Both the CV and EIS results illustrate that a small amount of doped Mn will reduce the electrode polarization and electrochemical impedance of the samples and simultaneously improve the electrochemical performance. Among all the samples, the LiFe0.98Mn0.02PO4/C sample has a desirable electrochemical performance, with its specific discharge capacity reaching 156.0 mAh g−1 at a rate of 0.1 C. Even at a high rate of 5 C, it can still reach 110.0 mAh g−1. All the results indicate that an appropriate amount of doped Mn has an emphatic effect on the electrochemical performance of LiFePO4/C.

Effect of doped Mn on improving the electrochemical performance of LiFePO4

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 {limit} columns in the table. Remove at least 1 column to add or create another one.

Gui-Yang Luo

Author Tools

Chat about Author

Papers

Ni-doped LiFePO4/C as high-performance cathode composites for Li-ion batteries

Electrochemical performance of in situ LiFePO4 modified by N-doped graphene for Li-ion batteries

Enhanced electrochemical performance of LiFePO4/C wrapped with sulfur-modified reduced graphene oxide for Li-ion batteries

Effect of doped Mn on improving the electrochemical performance of LiFePO4