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      A phytic acid derived LiMn 0.5Fe 0.5PO 4/Carbon composite of high energy density for lithium rechargeable batteries

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          Abstract

          A composite of olivine lithium manganese iron phosphate (LiMn 0.5Fe 0.5PO 4), external carbon coating and internal embedded carbon flakes, EC-IC-LMFP, is prepared by using phytic acid (PhyA) as phosphorus source via solvothermal process followed by calcination. The composite with improved electronic conductivity and ion diffusivity presents an ultrahigh reversible specific capacity of 193 mAh g −1 at 0.1 C, and an excellent cycling stability of 93% capacity retention after 100 cycles at 1 C when applied as a cathode material for Li-ion batteries (LIBs). Additionally, the composite fine powders exhibit a special microstructure and its volumetric energy density is estimated to reach 1605 Wh L −1, much larger than the commercial LiFePO 4.

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          Phosphorus-doped ordered mesoporous carbons with different lengths as efficient metal-free electrocatalysts for oxygen reduction reaction in alkaline media.

          Dae-Soo Yang, Dhrubajyoti Bhattacharjya, Shaukatali Inamdar … (2012)
          Phosphorus-doped ordered mesoporous carbons (POMCs) with different lengths were synthesized using a metal-free nanocasting method of SBA-15 mesoporous silica with different sizes as template and triphenylphosphine and phenol as phosphorus and carbon sources, respectively. The resultant POMC with a small amount of P doping is demonstrated as a metal-free electrode with excellent electrocatalytic activity for oxygen reduction reaction (ORR), coupled with much enhanced stability and alcohol tolerance compared to those of platinum via four-electron pathway in alkaline medium. Interestingly, the POMC with short channel length is found to have superior electrochemical performances compared to those with longer sizes.
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            Rational material design for ultrafast rechargeable lithium-ion batteries.

            Yuxin Tang, Yanyan Zhang, Wenlong Li … (2015)
            Rechargeable lithium-ion batteries (LIBs) are important electrochemical energy storage devices for consumer electronics and emerging electrical/hybrid vehicles. However, one of the formidable challenges is to develop ultrafast charging LIBs with the rate capability at least one order of magnitude (>10 C) higher than that of the currently commercialized LIBs. This tutorial review presents the state-of-the-art developments in ultrafast charging LIBs by the rational design of materials. First of all, fundamental electrochemistry and related ionic/electronic conduction theories identify that the rate capability of LIBs is kinetically limited by the sluggish solid-state diffusion process in electrode materials. Then, several aspects of the intrinsic materials, materials engineering and processing, and electrode materials architecture design towards maximizing both ionic and electronic conductivity in the electrode with a short diffusion length are deliberated. Finally, the future trends and perspectives for the ultrafast rechargeable LIBs are discussed. Continuous rapid progress in this area is essential and urgent to endow LIBs with ultrafast charging capability to meet huge demands in the near future.
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              Reducing Carbon in LiFePO[sub 4]/C Composite Electrodes to Maximize Specific Energy, Volumetric Energy, and Tap Density

              Zhaohui Chen, J. Dahn (2002)
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                Author and article information

                Contributors
                Yong Guo: guoy@scu.edu.cn
                Dan Xiao: xiaodan@scu.edu.cn
                Journal
                Journal ID (nlm-ta): Sci Rep
                Journal ID (iso-abbrev): Sci Rep
                Title: Scientific Reports
                Publisher: Nature Publishing Group UK (London )
                ISSN (Electronic): 2045-2322
                Publication date (Electronic): 30 April 2019
                Publication date PMC-release: 30 April 2019
                Publication date Collection: 2019
                Volume: 9
                Electronic Location Identifier: 6665
                Affiliations
                [1 ]ISNI 0000 0001 0807 1581, GRID grid.13291.38, School of Chemical Engineering, , Sichuan University, ; Chengdu, 610065 China
                [2 ]ISNI 0000 0001 0807 1581, GRID grid.13291.38, Institute of New Energy and Low-Carbon Technology (INELT), , Sichuan University, ; Chengdu, 610207 China
                [3 ]ISNI 0000 0001 0807 1581, GRID grid.13291.38, College of Chemistry, , Sichuan University, ; Chengdu, 610064 China
                Article
                Publisher ID: 43140
                DOI: 10.1038/s41598-019-43140-7
                PMC ID: 6491431
                PubMed ID: 31040319
                SO-VID: 230857c5-0ba5-4e69-9d2d-9be008ac3c91
                Copyright © © The Author(s) 2019
                License:

                Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

                History
                Date received : 5 November 2018
                Date accepted : 15 April 2019
                Funding
                Funded by: FundRef https://doi.org/10.13039/501100001809, National Natural Science Foundation of China (National Science Foundation of China);
                Award ID: 21777108
                Award Recipient :
                Categories
                Subject: Article
                Custom metadata
                issue-copyright-statement © The Author(s) 2019

                ScienceOpen disciplines: Uncategorized
                Keywords: batteries
                Data availability:
                ScienceOpen disciplines: Uncategorized
                Keywords: batteries

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