Vertically Grown Edge‐Rich Graphene Nanosheets for Spatial Control of Li Nucleation

Song, Qiang; Yan, Hongxia; Liu, Kedi; Xie, Keyu; Li, Wei; Gai, Wenhan; Chen, Guohui; Li, Hejun; Shen, Chao; Fu, Qiangang; Zhang, Shouyang; Zhang, Leilei; Wei, Bingqing

doi:10.1002/aenm.201800564

Cited by 151 publications

(65 citation statements)

References 47 publications

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“…So, developing novel electrode materials with high energy and power densities as well as long cycle life is of great significance. Li metal electrodes, hailed as “Holy Grail” electrode, show incomparable advantages including high specific capacity (3860 mAh g −1 ) and low electrochemical potential (−3.040 V vs standard hydrogen electrode) and have been considered as the most promising next‐generation electrode materials for Li‐S, Li‐air batteries, and so on . However, the lithium metal batteries (LMBs) always suffer dendritic Li during the repeated plating/stripping process, which not only causes the formation of lots of “dead Li” and blocks the Li + /electron transportation between the bulk Li and the electrolyte and furtherly results in the low coulombic efficiency (CE) but also is the main culprit in piercing the separator, giving rise to the internal short circuits and finally leading to the serious security risks .…”

Section: Introductionmentioning

confidence: 99%

Large‐Scale Modification of Commercial Copper Foil with Lithiophilic Metal Layer for Li Metal Battery

Cui

Zhai

Yang

et al. 2020

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and long cycle life are urgently pursued. [1][2][3][4] However, current lithium-ion batteries (LIBs) have almost reached their theoretical limitation. [5][6][7][8] So, developing novel electrode materials with high energy and power densities as well as long cycle life is of great significance. Li metal electrodes, hailed as "Holy Grail" electrode, show incomparable advantages including high specific capacity (3860 mAh g −1 ) and low electrochemical potential (−3.040 V vs standard hydrogen electrode) and have been considered as the most promising next-generation electrode materials for Li-S, Li-air batteries, and so on. [9][10][11] However, the lithium metal batteries (LMBs) always suffer dendritic Li during the repeated plating/stripping process, which not only causes the formation of lots of "dead Li" and blocks the Li + / electron transportation between the bulk Li and the electrolyte and furtherly results in the low coulombic efficiency (CE) but also is the main culprit in piercing the separator, giving rise to the internal short circuits and finally leading to the serious security risks. [12][13][14] In addition, the unstable solid electrolyte interphase (SEI) is formed repeatedly on the surface of Li metal during the charge-discharge process, which leads to the nonuniform Li ionic flux and further aggravates the growth of dendritic Li as well as depletes the electrolyte. [15][16][17][18] All these disadvantages lead to low CE and poor cyclability and further impede the commercialization of LMBs.In recent years, many attempts have been exerted to eliminate the formation of Li dendrite and enhance the cyclability of LMBs. Fabricating stable intrinsic SEI layer by the liquid electrolyte additives can improve partly the electrochemical performance. [19][20][21][22][23] Similarly, preparing artificial SEI layer with high Young's Modulus on the surface of the Li metal is another common way to suppress the dendrite growth. [24][25][26][27] Modified separator with functional materials for LMBs is also adopted to inhibit the formation of dendritic Li and shows some progress. [28] Solid electrolytes with high Young's modulus have exhibited good resistance to lithium dendrites in previous reports. [29,30] Although some good results are achieved by these strategies, the complicated synthesis process, high cost, great weight or instability during long-term cycle limit their practical applications. More recently, designing 3D collectors with a lithiophilic surface as host for storing Li metal, such as modified 3D Cu foam or Ni foam, shows some progress since large specific area of 3D structure is beneficial to decreasing the local current density and regulating the distribution of electric fieldThe application and development of lithium metal battery are severely restricted by the uncontrolled growth of lithium dendrite and poor cycle stability. Uniform lithium deposition is the core to solve these problems, but it is difficult to be achieved on commercial Cu collectors. In this work, a simple and commercially viable stra...

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Section: Introductionmentioning

confidence: 99%

Large‐Scale Modification of Commercial Copper Foil with Lithiophilic Metal Layer for Li Metal Battery

Cui

Zhai

Yang

et al. 2020

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“…The plenty of edges and defects in VG can act as lithiophilic sites to reduce the Li nucleation energy barrier [42,43]. Meanwhile, Li/C compound can be formed in the edge-rich multilayer graphene due to Li intercalation at a relatively low potential, further increasing the lithiophilicity of whole electrode [44]. The surface chemistry of the VG@GP film is analyzed by X-ray photoelectron spectroscopy (XPS).…”

Section: Resultsmentioning

confidence: 99%

Vertical Graphenes Grown on a Flexible Graphite Paper as an All-Carbon Current Collector towards Stable Li Deposition

et al. 2020

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Lithium (Li) metal has been regarded as one of the most promising anode materials to meet the urgent requirements for the next-generation high-energy density batteries. However, the practical use of lithium metal anode is hindered by the uncontrolled growth of Li dendrites, resulting in poor cycling stability and severe safety issues. Herein, vertical graphene (VG) film grown on graphite paper (GP) as an all-carbon current collector was utilized to regulate the uniform Li nucleation and suppress the growth of dendrites. The high surface area VG grown on GP not only reduces the local current density to the uniform electric field but also allows fast ion transport to homogenize the ion gradients, thus regulating the Li deposition to suppress the dendrite growth. The Li deposition can be further guided with the lithiation reaction between graphite paper and Li metal, which helps to increase lithiophilicity and reduce the Li nucleation barrier as well as the overpotential. As a result, the VG film-based anode demonstrates a stable cycling performance at a current density higher than 5 mA cm-2 in half cells and a small hysteresis of 50 mV at 1 mA cm-2 in symmetric cells. This work provides an efficient strategy for the rational design of highly stable Li metal anodes.

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“…N3 samples showed a relatively low rate of mass change. This is because the excess carbon in the PCS precursor is consumed by the trace of oxygen, forming a thin amorphous layer of carbon on the surface of the nanowire [14] . It can be observed from the TEM image that there is an amorphous carbon layer on the surface of SiC nanowires, and the oxidation of the amorphous carbon layer will consume and result in weight loss.…”

Section: Table 2 Elemental Analysis Results Of Different Regions In A3mentioning

confidence: 99%

Adjusting the Morphology and Properties of SiC Nanowires by the Catalyst Control

Guo

Cheng

2020

Preprint

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Herein, we report the growth of SiC nanowires on a single crystal Si substrate by pyrolysis of polycarbosilane and using two catalyst (Al2O3 and Ni) films with different thickness (2, 4, and 6 nm). The catalyst films were deposited on the Si substrate, and the SiC nanowires were grown according to two mechanisms, i.e., the oxide-assisted growth mechanism and vapor- liquid-solid mechanism. As a result, the pearl-chain-like SiC nanowires and straight SiC nanowires were obtained. The prepared nanowires exhibited excellent photoluminescence properties, the emission spectra displaying two emission peaks at 395 and 465 nm, and have good thermal stability below 1000℃.The experimental results revealed the importance of the catalyst in controlling the morphology and properties of SiC nanowires.

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Vertically Grown Edge‐Rich Graphene Nanosheets for Spatial Control of Li Nucleation

Cited by 151 publications

References 47 publications

Large‐Scale Modification of Commercial Copper Foil with Lithiophilic Metal Layer for Li Metal Battery

Large‐Scale Modification of Commercial Copper Foil with Lithiophilic Metal Layer for Li Metal Battery

Vertical Graphenes Grown on a Flexible Graphite Paper as an All-Carbon Current Collector towards Stable Li Deposition

Adjusting the Morphology and Properties of SiC Nanowires by the Catalyst Control

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