scholarly journals LiFePO4-Graphene Composites as High-Performance Cathodes for Lithium-Ion Batteries: The Impact of Size and Morphology of Graphene

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 842 ◽  
Author(s):  
Yanqing Fu ◽  
Qiliang Wei ◽  
Gaixia Zhang ◽  
Yu Zhong ◽  
Nima Moghimian ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Lithium Iron Phosphate ◽  
Low Cost ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Full Potential ◽  
Active Materials ◽  
Size And Morphology ◽  
The Impact

In this work, we investigated three types of graphene (i.e., home-made G, G V4, and G V20) with different size and morphology, as additives to a lithium iron phosphate (LFP) cathode for the lithium-ion battery. Both the LFP and the two types of graphene (G V4 and G V20) were sourced from industrial, large-volume manufacturers, enabling cathode production at low cost. The use of wrinkled and/or large pieces of a graphene matrix shows promising electrochemical performance when used as an additive to the LFP, which indicates that the features of large and curved graphene pieces enable construction of a more effective conducting network to realize the full potential of the active materials. Specifically, compared to pristine LFP, the LFP/G, LFP/G V20, and LFP/G V4 show up to a 9.2%, 6.9%, and 4.6% increase, respectively, in a capacity at 1 C. Furthermore, the LFP combined with graphene exhibits a better rate performance than tested with two different charge/discharge modes. Moreover, from the economic and electrochemical performance view point, we also demonstrated that 1% of graphene content is optimized no matter the capacity calculated, based on the LFP/graphene composite or pure LFP.

Iron Phosphates as Cathodes of Lithium-Ion Batteries

2006 ◽  
Vol 973 ◽  
Author(s):  
Shijun Wang ◽  
M. Stanley Whittingham
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Iron Phosphate ◽  
Low Cost ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Environmentally Benign ◽  
Iron Phosphates ◽  
Electrochemical Capacity ◽  
High Theoretical Capacity ◽  
Olivine Structure

ABSTRACTThis study focusses on optimizing the parameters of the hydrothermal synthesis to produce iron phosphates for lithium ion batteries, with an emphasis on pure LiFePO4 with the olivine structure and compounds containing a higher iron:phosphate ratio. Lithium iron phosphate (LiFePO4) is a promising cathode candidate for lithium ion batteries due to its high theoretical capacity, environmentally benign and the low cost of starting materials. Well crystallized LiFePO4 can be successfully synthesized at temperatures above 150 °C. The addition of a reducing agent, such as hydrazine, is essential to minimize the oxidation of ferrous (Fe2+) to ferric (Fe3+) in the final compound. The morphology of LiFePO4 is highly dependent on the pH of the initial solution. This study also investigated the lipscombite iron phosphates of formula Fe1.33PO4OH. This compound has a log-like structure formed by Fe-O octahedral chains. The chains are partially occupied by the Fe3+ sites, and these iron atoms and some of the vacancies can be substituted by other cations. Most of the protons can be ion-exchanged for lithium, and the electrochemical capacity is much increased.

Research on Performance and Preparation of LiFePO4

2014 ◽  
Vol 686 ◽  
pp. 31-35
Author(s):  
Yan Li
Keyword(s):  
Electrochemical Performance ◽  
Cathode Material ◽  
Particle Deposition ◽  
Electrode Materials ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Structure Characterization ◽  
Synthetic Methods ◽  
Material Particle

This paper makes use of various synthetic methods and analysis techniques, from material preparation, structure characterization of the electrochemical performance, we systematic study lithium iron phosphate, preparation electrode materials with good performance. This paper mainly aims at the two fatal drawbacks restrict the performance of LiFePO4cathode material, namely, low electron conductivity and lithium ion diffusion rate low, take the material particle, particle deposition on the surface of carbon conductive layer and Mg2+ion doping and other measures to modify it to explore, in order to improve the electrochemical performance of LiFePO4cathode material.

High-performance lithium iron phosphate with phosphorus-doped carbon layers for lithium ion batteries

2015 ◽  
Vol 3 (5) ◽  
pp. 2043-2049 ◽  
Author(s):  
Zhang Jinli ◽  
Wang Jiao ◽  
Liu Yuanyuan ◽  
Nie Ning ◽  
Gu Junjie ◽  
...  
Keyword(s):  
Carbon Source ◽  
Lithium Ion Batteries ◽  
Hydrothermal Method ◽  
High Performance ◽  
Carbon Coating ◽  
Lithium Iron Phosphate ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Phosphorus Source ◽  
Phosphorus Doped

A novel composite of LiFePO4 with phosphorus-doped carbon layers has been prepared via a simple hydrothermal method using glucose as the carbon source to generate a carbon coating and triphenylphosphine as the phosphorus source.

scholarly journals Effect of Conductive Material Morphology on Spherical Lithium Iron Phosphate

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 904 ◽  
Author(s):  
Lizhi Wen ◽  
Jiachen Sun ◽  
Liwei An ◽  
Xiaoyan Wang ◽  
Xin Ren ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Low Temperature ◽  
Electrochemical Performance ◽  
Lithium Iron Phosphate ◽  
Carbon Sources ◽  
Lithium Ion ◽  
Iron Phosphate ◽  
Internal Resistance ◽  
Conductive Agent ◽  
The Stability

As an integral part of a lithium-ion battery, carbonaceous conductive agents have an important impact on the performance of the battery. Carbon sources (e.g., granular Super-P and KS-15, linear carbon nanotube, layered graphene) with different morphologies were added into the battery as conductive agents, and the effects of their morphologies on the electrochemical performance and processability of spherical lithium iron phosphate were investigated. The results show that the linear carbon nanotube and layered graphene enable conductive agents to efficiently connect to the cathode materials, which contribute to improving the stability of the electrode-slurry and reducing the internal resistance of cells. The batteries using nanotubes and graphene as conductive agents showed weaker battery internal resistance, excellent electrochemical performance and low-temperature dischargeability. The battery using carbon nanotube as the conductive agent had the best overall performance with an internal resistance of 30 mΩ. The battery using a carbon nanotube as the conductive agent exhibited better low-temperature performance, whose discharge capacity at −20 °C can reach 343 mAh, corresponding to 65.0% of that at 25 °C.

Exploring the Evolution Process of High-Performance Amethyst Geode-Shaped Hollow Spherical LiFePO4

2021 ◽  
Author(s):  
Lu Chen ◽  
yan meng ◽  
Yujue Wang ◽  
Pengfei Wang ◽  
Jianming Li ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
High Performance ◽  
Lithium Iron Phosphate ◽  
Iron Phosphate ◽  
Evolution Process ◽  
Shape Evolution

Hollow spherical lithium iron phosphate (LiFePO4) materials display outstanding electrochemical performance in general. Previous reports on hollow spherical LiFePO4 (LFP) mostly focus on electrochemical performance, while the shape evolution process...

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