Improving Electrochemical Properties of LiCoPO4 by Mn Substitution: A Case Research on LiCo0.5Mn0.5PO4

Ni, Jiang Feng; Han, Yuhai; Liu, Jianzhong; Wang, Haibo; Gao, Li

doi:10.1149/2.002301eel

Cited by 22 publications

(22 citation statements)

References 16 publications

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“…23 However, this LiFePO 4 cathode is not suitable to attain the highenergy density batteries described above, because its voltage is insufficiently high. Many studies have been carried out on other olivine compounds such as LiMnPO 4 [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50][51][52] and its utilization enables us to attain highenergy density batteries. Many strategies for the LiCoPO 4 cathode, similar to those of the LiFePO 4 cathode, have been proposed, because they present common problems that hinder their practical application: particle fining, [39][40][41] carbon coating of the particle surface, [42][43][44][45][46] and the cation substitution.…”

mentioning

confidence: 99%

Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds

Hanafusa

Oka

Nakamura

2014

J. Electrochem. Soc.

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Li-deficient olivine compounds, Li 1-x Co 1-x Fe x PO 4 (x < 0.15), were prepared by calcination of the sol-gel derived precursors in ambient atmosphere. They were almost single phase at x < 0.10 but some impurity phases were found at x > 0.10. The lattice parameters changed continuously with an increase in the Fe substitution. Their variation in the range of x < 0.10 roughly obeyed Vergard's law. From the 57 Fe Mössbauer spectrum at room temperature, it was shown that the introduced Fe took a trivalent highspin state in the olivine lattice. The temperature-dependent magnetic susceptibility exhibited that the Fe incorporation enhanced the antiferromagnetic ordering: the Neel temperature shifted higher. Furthermore, the electrochemical performances, such as cycling stability and rate capability, were improved significantly with an appropriate substitution (about 10%) with Fe 3+ . Consequently, the Fe 3+ incorporated compounds with Li deficiency as the charge compensation are thought to be good candidates as high-voltage cathode material, which may enhance the energy density of Li ion battery.

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confidence: 99%

Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds

Hanafusa

Oka

Nakamura

2014

J. Electrochem. Soc.

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“…In addition, the characteristic of Co 2+/ Co 3+ redox couple transition in crystalline CoPO 4 is known to occur at 4.8 V vs. Li 0 /Li + . Hence, it is highly possible that Li-intercalation into a -CoPO 4 nanoparticle during electrochemical reduction may also contribute to higher discharge capacities29. Consequently, the electrochemical reaction mechanism (Fig.…”

Section: Resultsmentioning

confidence: 99%

An in-situ gas chromatography investigation into the suppression of oxygen gas evolution by coated amorphous cobalt-phosphate nanoparticles on oxide electrode

Gim

Song

Kim

et al. 2016

Sci Rep

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The real time detection of quantitative oxygen release from the cathode is performed by in-situ Gas Chromatography as a tool to not only determine the amount of oxygen release from a lithium-ion cell but also to address the safety concerns. This in-situ gas chromatography technique monitoring the gas evolution during electrochemical reaction presents opportunities to clearly understand the effect of surface modification and predict on the cathode stability. The oxide cathode, 0.5Li2MnO3∙0.5LiNi0.4Co0.2Mn0.4O2, surface modified by amorphous cobalt-phosphate nanoparticles (a-CoPO4) is prepared by a simple co-precipitation reaction followed by a mild heat treatment. The presence of a 40 nm thick a-CoPO4 coating layer wrapping the oxide powders is confirmed by electron microscopy. The electrochemical measurements reveal that the a-CoPO4 coated overlithiated layered oxide cathode shows better performances than the pristine counterpart. The enhanced performance of the surface modified oxide is attributed to the uniformly coated Co-P-O layer facilitating the suppression of O2 evolution and offering potential lithium host sites. Further, the formation of a stable SEI layer protecting electrolyte decomposition also contributes to enhanced stabilities with lesser voltage decay. The in-situ gas chromatography technique to study electrode safety offers opportunities to investigate the safety issues of a variety of nanostructured electrodes.

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“…This outperformed some of the best reported cathode materials with ultrahigh rate capabilities, which may open a new possibility for utilizing intrinsically safe but insulating olivine materials such as LiMnPO 4 and LiCoPO 4 . [112,113] Alternatively, graphene supported spine LiMn 2 O 4 and layered LiNi 0.66 Co 0.17 Mn 0.17 O 2 outperformed the pristine materials in terms of capacity delivery, rate performance and cyclability. [114,115] In recent years, there has been a research trend in combining the sulfur electrode with graphene for Li/S batteries.…”

Section: D Graphene Hybridsmentioning

confidence: 99%

Carbon Nanomaterials in Different Dimensions for Electrochemical Energy Storage

2016

Advanced Energy Materials

252

109

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In spite of an ongoing advancement, current popular EES systems including Li-ion batteries (LIBs), supercapacitors (SCs), and redox flow cells (RFCs) are limited by severe performance challenges of electrode materials in terms of low energy and power density as well as short durability. To mitigate the issues, carbon nanomaterials could be introduced to these EES systems, taking advantage of their unique geometry, excellent conductivity, large surface area, and intrinsic flexibility. Numerous carbon nanomaterial based EES systems, where carbon nanomaterials are adopted as either conducting additive or active electrode, have been developed and demonstrated appealing energy and power features. With the capability to enhance the structural and electrochemical properties of electrodes, carbon nanomaterials and their derivatives offer a wide range of possibilities to design advanced EES devices that can meet our growing energy and power demands in the future.A number of reviews have been published in the past few years on the application of carbon nanomaterials in EES. [5][6][7][8] However, this area is so active and new works accumulate very quickly. Therefore, it is helpful to update the new designs and outcomes. This progress report will summarize the most exciting recent (from the year 2010 onwards) advances in the application of carbon nanomaterials with different dimensions, i.e., 0D fullerene, 1D CNT, 2D graphene, and 3D assemblies of CNT and graphene, in EES systems, and highlight the new trends in the field. Besides the repetitively reviewed LIBs and SCs, this work will also deal with another important system, the RFC, which has been rejuvenated recently and is becoming increasingly vital for large scale energy storage. The recent EES applications of carbon nanomaterials will be discussed based on their dimensions. Structure and Properties of Various Nanostructured CarbonFullerenes, CNTs, and graphene all present conjugated π electron systems. The unique electronic configuration combined with geometric structure endows them with extraordinary properties, which make them superior to their competitors for specific applications such as EES. 0D FullerenesFullerene normally has a hollow sphere or ellipsoid shape. Specifically, C 60 has a cage-like fused-ring structure (truncated Carbon nanomaterials including fullerenes, carbon nanotubes, graphene, and their assemblies represent a unique type of materials in diverse formats and dimensions. They feature a large surface area, superior conductivity, fast charge transport, and intrinsic stability, which are essentially required for vari ous electrochemical energy storage (EES) systems such as Li-ion batteries, supercapacitors, and redox flow cells. The scaled-up and reliable production and assembly of carbon nanomaterials is a prerequisite for the development of carbon nanomaterial-based EES devices. In this progress report, the preparation of carbon nanostructures and the state-of-the-art applications of carbon nanomaterials with different dimensions in versatile EES...

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Improving Electrochemical Properties of LiCoPO4 by Mn Substitution: A Case Research on LiCo0.5Mn0.5PO4

Cited by 22 publications

References 16 publications

Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds

Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds

An in-situ gas chromatography investigation into the suppression of oxygen gas evolution by coated amorphous cobalt-phosphate nanoparticles on oxide electrode

Carbon Nanomaterials in Different Dimensions for Electrochemical Energy Storage

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Improving Electrochemical Properties of LiCoPO4 by Mn Substitution: A Case Research on LiCo0.5Mn0.5PO4

Cited by 22 publications

References 16 publications

Electrochemical and Magnetic Studies of Li-Deficient Li1-xCo1-xFexPO4Olivine Cathode Compounds

Electrochemical and Magnetic Studies of Li-Deficient Li1-xCo1-xFexPO4Olivine Cathode Compounds

An in-situ gas chromatography investigation into the suppression of oxygen gas evolution by coated amorphous cobalt-phosphate nanoparticles on oxide electrode

Carbon Nanomaterials in Different Dimensions for Electrochemical Energy Storage

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Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds

Electrochemical and Magnetic Studies of Li-Deficient Li_1-xCo_1-xFe_xPO₄Olivine Cathode Compounds