Preparation of nano-structured LiFePO4/graphene composites by co-precipitation method

Ding, Yanhuai; Jiang, Yong; Xu, Fugui; Yin, Jiuren; Ren, Honglei; Zhuo, Qin; Long, Zhihang; Zhang, P.

doi:10.1016/j.elecom.2009.10.023

Cited by 326 publications

(146 citation statements)

References 15 publications

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“…Moreover, a poly (vinyl difluoride) binder and acetylene black were used in the fabrication of the LFP/graphene network electrode by magnetic stirring. This LFP/graphene electrode showed a moderate-rate performance similar to LFP/chemically derived graphene electrodes (27,28), possibly because the graphene conductive network may be broken during the stirring process, resulting in damage to the unique structure and degradation in the properties of the GFs.…”

Section: Resultsmentioning

confidence: 93%

“…The specific capacity of the LFP/GF electrode at a 50-C discharge rate is 98 mAh/g (SI Appendix, Fig. S11A), which is higher than those of LFP/chemically derived graphene hybrid electrodes integrated with aluminum foil current collectors, carbon black additive, and binder (27,28). This high-rate performance is much better than that of a flexible LFP/multiwalled carbon nanotube-yarn electrode, which only retained a capacity of ∼50 mAh/g at a 10-C rate (12).…”

Section: Resultsmentioning

confidence: 98%

See 1 more Smart Citation

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Chen

Ren

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

733

493

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There is growing interest in thin, lightweight, and flexible energy storage devices to meet the special needs for next-generation, high-performance, flexible electronics. Here we report a thin, lightweight, and flexible lithium ion battery made from graphene foam, a three-dimensional, flexible, and conductive interconnected network, as a current collector, loaded with Li 4 Ti 5 O 12 and LiFePO 4 , for use as anode and cathode, respectively. No metal current collectors, conducting additives, or binders are used. The excellent electrical conductivity and pore structure of the hybrid electrodes enable rapid electron and ion transport. For example, the Li 4 Ti 5 O 12 / graphene foam electrode shows a high rate up to 200 C, equivalent to a full discharge in 18 s. Using them, we demonstrate a thin, lightweight, and flexible full lithium ion battery with a high-rate performance and energy density that can be repeatedly bent to a radius of 5 mm without structural failure and performance loss.flexible device | full battery T he development of next-generation flexible electronics (1), such as soft, portable electronic products, roll-up displays, wearable devices, implantable biomedical devices, and conformable health-monitoring electronic skin, requires power sources that are flexible (2, 3). Similar to conventional energy storage devices, flexible power sources with high capacity and rate performance that enable electronic devices to be continuously used for a long time and fully charged in a very short time are very important for applications of high-performance flexible electronics (4-7). Lithium ion batteries (LIBs) have a high capacity but usually suffer from a low charge/discharge rate compared with another important electrochemical storage device, supercapacitors. Therefore, it is highly desired to fabricate a flexible electrochemical energy storage system with a supercapacitor-like fast charge/discharge rate and battery-like high capacity. However, the fabrication of such an energy storage device remains a great challenge owing to the lack of reliable materials that combine superior electron and ion conductivity, robust mechanical flexibility, and excellent corrosion resistance in electrochemical environments.Using nano-sized materials to prepare electrodes is one of the most promising routes toward flexible batteries. Metal oxide nanowires (8, 9) and carbon nanomaterials such as carbon nanotubes (6, 10-12) and graphene paper (13) have been recently demonstrated for use in flexible LIBs. However, electron transport in these electrodes is slow because of the relatively low quality of nanomaterials (such as chemically derived graphene) and/or high junction contact resistance between them. As a consequence, only a moderate charge/discharge rate has been obtained in these flexible batteries. It is generally believed that the charge/discharge rate of a LIB depends critically on the migration rate of lithium ions and electrons through the electrolyte and bulk electrodes into active electrode materials. Strategies to inc...

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Section: Resultsmentioning

confidence: 93%

Section: Resultsmentioning

confidence: 98%

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Chen

Ren

et al. 2012

Proc. Natl. Acad. Sci. U.S.A.

733

493

View full text Add to dashboard Cite

show abstract

“…Inspired by the excellent conductivity and large theoretical surface area of graphene, LiFeO 4 nanoparticles are modified on graphene sheets. The capacity and cycle performances of LiFePO 4 could be improved considerably by the addition of graphene, and the hybrid cathode possesses an initial discharge capacity of 160 mA h g 1 at 0.2 C and the capacity retained 110 mA h g 1 even at high rate of 10 C with only 1.5 wt% of graphene [48]. Nanostructured composites can often produce synergistic benefits on the performance of the LIB electrode materials [32,33].…”

Section: Lithium Ion Batterymentioning

confidence: 99%

Graphene-based hybrid materials and their applications in energy storage and conversion

2012

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Graphene attracts more and more scientists and researchers owing to its superior electronic, thermal, and mechanical properties. For material scientists, graphene is a kind of versatile building blocks, and considerable progress has been made in recent years. Graphene-based hybrid materials have been prepared by incorporating inorganic species and/or cross-linking of organic species through covalent and/or noncovalent interactions. The graphene-based hybrid materials show improved or excellent performance in various fields. In this review, we summarize the synthesis of graphene and graphene-based hybrid materials, and their applications in energy storage and conversion. graphene, hybrid material, energy storage, energy conversion Citation:Zhou D, Cui Y, Han B H. Graphene-based hybrid materials and their applications in energy storage and conversion.

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“…One of the significant approaches to enhance their conductivity is mixing them with conductive materials like carbon, metal and metal oxide. Investigations demonstrate that carbon materials are usually used to enhance the conductivity of LiFePO 4 [5,[17][18][19][20][21][22]. For example, Bhuvaneswari et al have reported that LiFePO 4 /carbon nano fiber (10 wt.%) delivers a higher specific capacity (~140 mAh g -1 ) than LiFePO 4 with carbon black (25 wt.%) added after synthesis (~120 mAh g -1 ) at a low rate of 0.1 C (note that the C rating refers to the charge or discharge rate of the battery in relation to its capacity.)…”

Section: Introductionmentioning

confidence: 99%

Effects of Silver Nanowires on The Electro-chemical Performance of LiFePO4

Chen¹,

Zhu²,

Zhu³

et al. 2011

Nano BioMed ENG

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Lithium iron phosphate (LiFePO 4 ) is a promising cathode material for lithium-ion batteries. However, an important drawback of this material is its poor conductivity. In this approach, a simple approach is firstly proposed to enhance the conductivity of LiFePO 4 cathodes by dispersing conductive Ag nanowires to these cathodes. LiFePO 4 /Ag nanowires composite cathodes were characterized by X-ray diffraction (XRD) and field emission scanning electron microscope (FSEM), and their electrochemical performance were evaluated by charge/discharge tests. It is demonstrated that the capacity and rate capability of LiFePO 4 /Ag nanowires composite cathodes can be improved considerably by the addition of Ag nanowires. Especially, discharge capacities are improved from ~110 mAh g -1 of LiFePO 4 cathodes to ~150 mAh g -1 for LiFePO 4 /Ag nanowires composite cathodes at 0.2 C. Therefore, LiFePO 4 /Ag nanowires cathodes can be used as an attractive positive electrode candidate for lithium-ion batteries.

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Preparation of nano-structured LiFePO4/graphene composites by co-precipitation method

Cited by 326 publications

References 15 publications

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Flexible graphene-based lithium ion batteries with ultrafast charge and discharge rates

Graphene-based hybrid materials and their applications in energy storage and conversion

Effects of Silver Nanowires on The Electro-chemical Performance of LiFePO4

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