Flexible and free-standing SiOx/CNT composite films for high capacity and durable lithium ion batteries

Guo, Wenlei; Yan, Xiao; Hou, Feng; Lei, Wen; Dai, Yejing; Yang, Deming; Jiang, Xiaotong; Liu, Jian; Liang, Ji; Dou, Shi Xue

doi:10.1016/j.carbon.2019.06.088

Cited by 87 publications

(41 citation statements)

References 41 publications

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“…S3), which is equivalent to that the film bears a pressure of 4.08 MPa, and it also coincides with the tensile strength mentioned above. Compared with the other reported Si or SiO-based materials, this Ni x -Co y -silicate@CNTs film exhibits better mechanical properties [38,42]. In addition, all of the films show strains of about 15% or higher when the stress reaches the maximum, which further validates the above conclusions.…”

Section: Materials Synthesis and Characterizationsupporting

confidence: 82%

“…First, continuous and free-standing SiO x /CNT hybrid films were prepared by the modified chemical vapor deposition (CVD) method in a vertical tube furnace (Fig. 1a) [42]. Our equipment is able to continuously produce paper-like thin films in about half an hour and ensure an industry scale production under a continuous supply of precursors.…”

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

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Ultrathin Ni Co -silicate nanosheets natively anchored on CNTs films for flexible lithium ion batteries

Guo

Zhang

et al. 2021

Journal of Energy Chemistry

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Section: Materials Synthesis and Characterizationsupporting

confidence: 82%

Section: Materials Synthesis and Characterizationmentioning

confidence: 99%

Ultrathin Ni Co -silicate nanosheets natively anchored on CNTs films for flexible lithium ion batteries

Guo

Zhang

et al. 2021

Journal of Energy Chemistry

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“…The py-B-CNTs film was synthesized by a pyridine-modified FCCVD method. Ethanol was chosen as carbon precursor dissolved with ferrocene and thiophene at a mass ratio of 95:1.5:1 (Guo et al, 2019). Then, boric acid (i.e., the boron precursor) and pyridine (i.e., the structure-modifying agent) were added into the precursor solution at proportions of 2 and 4 wt.%, respectively, and ultrasonically agitated for 20 min until fully dissolved.…”

Section: Methodsmentioning

confidence: 99%

A Flexible and Boron-Doped Carbon Nanotube Film for High-Performance Li Storage

Wang

Guo

et al. 2019

Front. Chem.

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Boron-doped carbon nanotubes are a promising candidate for Li storage due to the unique electronic structure and high crystallinity brought by the boron dopants. However, the relatively low Li storage capacity has limited its application in the electrochemical energy storage field, which is mainly caused by the predominantly intact graphitic structure on their surface with limited access points for Li ion entering. Herein, we report a novel B-doped CNTs (py-B-CNTs) film, in which the CNTs possess intrinsically rough surface but flat internal graphitic structure. When used as a flexible anode material for LIBs, this py-B-CNTs film delivers significantly enhanced capacity than the conventional B-doped CNTs or the pristine CNTs films, with good rate capability and excellent cycling performance as well. Moreover, this flexible film also possesses excellent mechanical flexibility, making it capable of being used in a prototype flexible LIB with stable power output upon various bending states.

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“…Applied into supercapacitors, it has been employed as an electrode when coupled with a wide variety of materials like cellulose (Pushparaj et al, 2007;Xing et al, 2019), polyaniline (de Souza Augusto et al, 2018;Kang et al, 2019), metallic foams (Gao et al, 2018;Manjakkal et al, 2018;Taniya Purkait, 2018) and aerogels (Bora et al, 2018) rendering overall promising results. Similarly, flexible Li-Ion batteries have also used carbon nanotubes as electrodes combined with graphene foams (Ren et al, 2018), carbon fibers , metal-oxides (Guo et al, 2019;Bubulinca et al, 2020) and nanoparticles (Yuan et al, 2018). In both cases, either as supercapacitors or batteries, the inclusion of the carbonbased electrode systems aided in solving some of the previously mentioned problems, as well as providing stability to the device, however, there are several challenging areas to improve: the selection and different combination of the electrode materials, electrolyte and separator in order to enhance electrochemical performance and to ensure better integrity and compatibility of said components; increasing device cycle stability; improving mechanical properties, conductivity and safety of solid-state electrolytes; optimizing cell structures; reducing toxicity and environmental impact (Li et al, 2014); and finally, developing self-powered systems (Ortega et al, 2019) to overcome all the previously mentioned limitations.…”

Section: Energy Storagementioning

confidence: 99%

Flexible Electronics: Status, Challenges and Opportunities

2020

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The concept of flexible electronics has been around for several decades. In principle, anything thin or very long can become flexible. While cables and wiring are the prime example for flexibility, it was not until the space race that silicon wafers used for solar cells in satellites were thinned to increase their power per weight ratio, thus allowing a certain degree of warping. This concept permitted the first flexible solar cells in the 1960s (Crabb and Treble, 1967). The development of conductive polymers (Shirakawa et al., 1977), organic semiconductors, and amorphous silicon (Chittick et al., 1969; Okaniwa et al., 1983) in the following decades meant huge strides toward flexibility and processability, and thus these materials became the base for electronic devices in applications that require bending, rolling, folding, and stretching, among other properties that cannot be fulfilled by conventional electronics (Cheng and Wagner, 2009) (Figure 1). Presently there is great interest in new materials and fabrication techniques which allow for highperformance scalable electronic devices to be manufactured directly onto flexible substrates. This interest has also extended to not only flexibility but also properties like stretchability and healability which can be achieved by utilizing elastomeric substrates with strong molecular interactions (Oh et al., 2016; Kang et al., 2018). Likewise, biocompatibility and biodegradability has been achieved through polymers that do not cause adverse effect to the body and can be broken down into smaller constituent pieces after utilization (Bettinger and Bao, 2010; Irimia-Vladu et al., 2010; Liu H. et al., 2019). This new progress is now enabling devices which can conform to complex and dynamic surfaces, such as those found in biological systems and bioinspired soft robotics. These next-generation flexible electronics open up a wide range of exciting new applications such as flexible lighting and display technologies for consumer electronics, architecture, and textiles, wearables with sensors that help monitor our health and habits, implantable electronics for improved medical imaging and diagnostics, as well as extending the functionality of robots and unmanned aircraft through lightweight and conformable energy harvesting devices and sensors. While conventional electronics are very capable of these functions, flexible electronics are intended to expand the mechanical features to adhere to novel form factors through hybrid strategies, or as standalone solutions where the application does not require high computation power, intended to be highly robust to deformation, low cost, thin, or disposable. The definition of flexibility differs from application to application. From bending and rolling for easier handling of large area photovoltaics, to conforming onto irregular shapes, folding, twisting, stretching, and deforming required for devices in electronic skin, all while maintaining device performance and reliability. While early progress and many important innovations have alre...

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Flexible and free-standing SiOx/CNT composite films for high capacity and durable lithium ion batteries

Cited by 87 publications

References 41 publications

Ultrathin Ni Co -silicate nanosheets natively anchored on CNTs films for flexible lithium ion batteries

Ultrathin Ni Co -silicate nanosheets natively anchored on CNTs films for flexible lithium ion batteries

A Flexible and Boron-Doped Carbon Nanotube Film for High-Performance Li Storage

Flexible Electronics: Status, Challenges and Opportunities

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