Lithium storage in a highly conductive Cu<sub>3</sub>Ge boosted Ge/graphene aerogel

Zhang, Chuanjian; Chai, Fenglian; Fu, Lin; Hu, Pu; Pang, Shuping; Cui, Guanglei

doi:10.1039/c5ta06862b

Cited by 26 publications

(18 citation statements)

References 38 publications

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“…[ 326 ] Nevertheless, some new hybrids were introduced in the LIB anode fi eld too. Indeed, graphene-containing glassy metal alloy nanofi ber, [ 327 ] selenides, [328][329][330][331][332] silicates, [ 333,334 ] molybdates, [335][336][337] oxides, [338][339][340][341] intermetallic compounds, [ 342,343 ] intermetallic oxides, [ 344,345 ] oxalate, [ 346 ] sulfi de, [ 347 ] nitride, [ 348 ] carbide [ 349 ] and phosphide [ 350 ] hybrids were reported (see Table 2 ). Despite the usual sloping delithiation voltage and the generally low content of graphene (i.e., ≤30 wt%), few of these hybrids [ 329,331,335 ] showed a low 1 st cycle irreversible capacity (i.e., <20%).…”

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confidence: 99%

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

et al. 2016

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that its extraordinary properties would enable revolutionary new technologies, which gave birth to the "graphene era". [ 3,4 ] Relying on this scenario, in 2013, the European Union launched the ¤1 billion "Graphene Flagship" project aimed to investigate the properties of this new form of carbon for various applications (e.g., electronics, sensors and energy storage devices), with the ambitious goal of guiding graphene from laboratories to commercial applications within a decade. [ 5,6 ] In the same period, the Chinese Government set up a similar investment to mass-produce graphene as thin fi lms (e.g., for touchscreen electrodes) and platelets (e.g., for use in batteries). [ 6 ] In the following years, hundreds of patents, mainly focused on manufacturing and application in energy storage, were fi led and the worldwide production of graphene and graphene-containing materials rapidly increased. Although a few Chinese industries claimed to already use graphene-containing materials for smartphone production, no revolutionary practical application relying on graphene has been yet developed. [ 6 ] Specifi cally with respect to the battery fi eld, a close analysis of the scientifi c literature reveals a struggle to meet the ambitious initial targets. A potential loss of focus from the fi nal application caused by hype and ease of publication on such a novel matter, together with the delivery of very misleading information [ 7,8 ] and erroneous statements [ 7 ] concerning the use of graphene in batteries are emerging as possible reasons of the ineffective graphene-era outburst. In this progress report, we do not focus on production and classifi cation of graphene and graphene-containing materials, which were already well reported in the past years. [ 3,[9][10][11] In contrast, due to the lack of an exhaustive analysis of the progression of the use of such materials in lithium-ion battery (LIB) anodes, we report here a critical evaluation of the most prominent research papers published from 2008 until the end of 2015. As shown in Figure 1 , three different stages of the graphene research in LIB anodes can be distinguished: a fi rst stationary phase between 2008 and 2010 where the lithium-ion storage properties of different graphene and graphene-containing materials were preliminarily explored, a second exponential stage, spanning from 2010 to 2014, where graphene and graphene-containing anode materials were broadly developed and investigated, and fi nally, a third phase, (i.e., starting from 2015), where the research seems to have approached a plateau. After Used as a bare active material or component in hybrids, graphene has been the subject of numerous studies in recent years. Indeed, from the fi rst report that appeared in late July 2008, almost 1600 papers were published as of the end 2015 that investigated the properties of graphene as an anode material for lithium-ion batteries. Although an impressive amount of data has been collected, a real advance in the fi eld still seems to be missing. In this framework, atten...

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confidence: 99%

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

et al. 2016

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“…It can be seen that even under long cycle conditions, the Cu 3 Ge/Ge@C can exhibit high stability. These electrochemical properties exhibited by the peapod‐like Cu 3 Ge/Ge@C composite are much better than the typical reported Ge‐based anodes . To demonstrate the excellent performance of the current Cu 3 Ge/Ge@C electrode more clearly, we have included a detailed performance comparison of Cu 3 Ge/Ge@C and some other Ge‐based anodes, as shown in Table .…”

Section: Resultsmentioning

confidence: 98%

“…These electrochemical properties exhibited by the peapod-like Cu 3 Ge/Ge@C composite are much better than the typical reported Ge-based anodes. [44,45] To demonstrate the excellent performance of the current Cu 3 Ge/Ge@C electrode more clearly,w eh ave included ad etailed performance comparison of Cu 3 Ge/Ge@C and some other Ge-based anodes, as shown in Ta ble 1. To sum up, this carbon-modified Cu 3 Ge/Ge anode obtained by the aforementioned process possesses outstanding high capacity and long life characteristics.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis of Peapod‐Like Cu₃Ge/Ge@C as a High‐Capacity and Long‐Life Anode for Li‐Ion Batteries

Wang

Liu

et al. 2019

Chemistry A European J

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As anode materials for high‐performance Li‐ion batteries, peapod‐like Ge‐based composites, including Ge, a Li‐inactive conducting Cu3Ge, and a porous carbon matrix are synthesized simply by annealing CuGeO3@dopamine in a H2/Ar atmosphere. The introduction of the carbon layer and inactive alloying phase Cu3Ge not only enhances the electrical conductivity of the Ge anode, but also reduces the volume change of Ge during the cell cycle as a buffer. In particular, the anode of this peapod‐like Cu3Ge/Ge@C shows an excellent long cycle life as well as outstanding capacity performance, with a discharge specific capacity up to 934 mA h g−1 after 500 cycles.

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“…Also, the monoclinic phase Cu 3 Ge exhibits super low metallic resistivity of 6 μΩ cm at room temperature, thus would further leading to the improved electrical conductivity of the composites. However, a few trials for introducing Cu 3 Ge into Ge electrode to improve their electrochemical performance, the structure between Cu 3 Ge and Ge were only mixture by ex situ fabrication process. Thus, those early attempts had little success in the improvement of the high rate performance for LIBs, even lower than the simple introduction of the copper materials.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, those early attempts had little success in the improvement of the high rate performance for LIBs, even lower than the simple introduction of the copper materials. Such as, Cui and co‐workers provided a Cu 3 Ge/Ge aerogel with unstable rechargeable capacity around 400 mA h g −1 at 2 C …”

Section: Introductionmentioning

confidence: 99%

A Composite Structure of Cu₃Ge/Ge/C Anode Promise Better Rate Property for Lithium Battery

Liang

Hou

et al. 2016

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Much effort has been made to search for high energy and high power density electrode materials for lithium ion batteries. Here, a composite structure among Ge, C and Cu3Ge in Cu3Ge/Ge/C materials with a high rate performance of lithium batteries has been reported. Such Cu3Ge/Ge/C composite is synthesized through the in-situ formation of Ge, C and Cu3Ge by one-pot reaction. Density function theory (DFT) calculations and electrochemical impedance spectroscopy (EIS) suggest a higher electron mobility of the hibrid Cu3Ge/Ge/C composites through the in-situ preparation. As a result, remarkable charge rate over 300 C (fast delithiated capability) and outstanding cycling stability (≈0.02% capacity decay per cycle for 500 cycles at 0.5 C) are achieved for the Cu3Ge/Ge/C composites anode. These Cu3Ge/Ge/C composites demonstrate another perspective to explore the energy storage materials and should provide a new pathway for the design of advanced electrode materials.

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Lithium storage in a highly conductive Cu₃Ge boosted Ge/graphene aerogel

Abstract: A Cu3Ge/Ge@G aerogel was synthesized via a simple pyrolysis route and directly employed as a high performance anode for lithium-ion batteries.

Cited by 26 publications

References 38 publications

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Facile Synthesis of Peapod‐Like Cu₃Ge/Ge@C as a High‐Capacity and Long‐Life Anode for Li‐Ion Batteries

A Composite Structure of Cu₃Ge/Ge/C Anode Promise Better Rate Property for Lithium Battery

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Lithium storage in a highly conductive Cu3Ge boosted Ge/graphene aerogel

Abstract: A Cu3Ge/Ge@G aerogel was synthesized via a simple pyrolysis route and directly employed as a high performance anode for lithium-ion batteries.

Cited by 26 publications

References 38 publications

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Facile Synthesis of Peapod‐Like Cu3Ge/Ge@C as a High‐Capacity and Long‐Life Anode for Li‐Ion Batteries

A Composite Structure of Cu3Ge/Ge/C Anode Promise Better Rate Property for Lithium Battery

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Lithium storage in a highly conductive Cu₃Ge boosted Ge/graphene aerogel

Facile Synthesis of Peapod‐Like Cu₃Ge/Ge@C as a High‐Capacity and Long‐Life Anode for Li‐Ion Batteries

A Composite Structure of Cu₃Ge/Ge/C Anode Promise Better Rate Property for Lithium Battery