Nanosized Si particles with rich surface organic functional groups as high-performance Li-battery anodes

Ren, Wenfeng; Wang, Yanhong; Tan, Qiangqiang; Yu, Jing; Etim, Ubong Jerom; Zhong, Ziyi; Su, Fabing

doi:10.1016/j.electacta.2019.134625

Cited by 16 publications

(4 citation statements)

References 65 publications

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“…First, synthesis a of the NPs is time-consuming and difficult, oen requiring high temperatures or harsh chemicals. [15][16][17][18][19][20][21][22][23][24][25] Second, once the Si NPs are formed, they have to be rapidly passivated to prevent the loss of their original properties. 26 This is especially the case for hydrogen-terminated Si NPs (H-Si NPs).…”

Section: Introductionmentioning

confidence: 99%

Fast room-temperature functionalization of silicon nanoparticles using alkyl silanols

et al. 2020

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Section: Introductionmentioning

confidence: 99%

Fast room-temperature functionalization of silicon nanoparticles using alkyl silanols

et al. 2020

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“…The electrochemical properties of the 800-HCl sample were investigated. The cyclic voltammetry shown in Figure 2 a indicated similar characteristic CV peaks belonging to typical crystalline silicon [ 21 ]. Two small peaks between 1.7 V and 0.5 V appeared in the first cathodic scan and disappeared in subsequent cycles.…”

Section: Resultsmentioning

confidence: 99%

High-Temperature Magnesiothermic Reduction Enables HF-Free Synthesis of Porous Silicon with Enhanced Performance as Lithium-Ion Battery Anode

Zuo

Yang

et al. 2022

Molecules

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Porous silicon-based anode materials have gained much interest because the porous structure can effectively accommodate volume changes and release mechanical stress, leading to improved cycling performance. Magnesiothermic reduction has emerged as an effective way to convert silica into porous silicon with a good electrochemical performance. However, corrosive HF etching is normally a mandatory step to improve the electrochemical performance of the as-synthesized silicon, which significantly increases the safety risk. This has become one of the major issues that impedes practical application of the magnesiothermic reduction synthesis of the porous silicon anode. Here, a facile HF-free method is reported to synthesize macro-/mesoporous silicon with good cyclic and rate performance by simply increasing the reduction temperature from 700 °C to 800 °C and 900 °C. The mechanism for the structure change resulting from the increased temperature is elaborated. A finite element simulation indicated that the 3D continuous structure formed by the magnesiothermic reduction at 800 °C and 900 °C could undertake the mechanical stress effectively and was responsible for an improved cyclic stability compared to the silicon synthesized at 700 °C.

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“…Then, the discharge process is dominated by the surface adsorption of Li ions owing to the high surface area of the low-dimensional structured anode materials and the B/Li ratio is ∼2.8 for the discharge plateau below 0.4 V . Similar to the functional groups on the Si surface, the methyl group on the boron surface affects the interfacial property of the electrode. It may form Li-contained species through reaction with electrolytes and help the formation of a solid electrolyte interphase (SEI) layer.…”

Section: Resultsmentioning

confidence: 99%

Imparting Boron Nanosheets with Ambient Stability through Methyl Group Functionalization for Mechanistic Investigation of Their Lithiation Process

Zhou

Zhan

Chen

et al. 2020

ACS Appl. Mater. Interfaces

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Although ultrahigh theoretical capacity has long been predicted for boron-based lithium-ion battery anodes, experimentally, boron has exhibited only limited performance and its lithiation process remains elusive. The two-dimensional (2D) form of boron is believed to be an ideal model system to investigate the lithiation behavior of boron; however, unfortunately, most reported 2D boron structures are prone to oxidation under ambient conditions. In this contribution, through a simultaneous etching and in situ functionalization process, we synthesized for the first time methyl-functionalized boron nanosheets, which remain stable up to 250 °C. Combining experiments and theoretical calculations, we found that lithiation of boron is realized through the formation of alloys such as LiB3 and Li3B14, while alloys with higher Li content such as Li5B are thermodynamically less favored. In addition, detailed electrochemical analysis reveals that side reactions on the boron surface may also contribute to the unsatisfactory performance of boron-based electrodes. Our findings suggest that reducing the enthalpy of formation of high Li content alloys and the choice of a less nucleophilic electrolyte are key to developing high-performance anodes based on novel boron materials. Our demonstration of stable 2D boron structures also paves the way for their fundamental study and practical applications.

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Nanosized Si particles with rich surface organic functional groups as high-performance Li-battery anodes

Cited by 16 publications

References 65 publications

Fast room-temperature functionalization of silicon nanoparticles using alkyl silanols

Fast room-temperature functionalization of silicon nanoparticles using alkyl silanols

High-Temperature Magnesiothermic Reduction Enables HF-Free Synthesis of Porous Silicon with Enhanced Performance as Lithium-Ion Battery Anode

Imparting Boron Nanosheets with Ambient Stability through Methyl Group Functionalization for Mechanistic Investigation of Their Lithiation Process

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