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Ram, Prakhya; Singh, Jagmal; Ramamohan, T. R.; Venkatachalam, S.; Sundarsingh, V.P.

doi:10.1023/a:1018653631062

Cited by 20 publications

(8 citation statements)

References 26 publications

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“…6a͒ showed predominantly the SiO 2 peak at 103.6 eV plus a broad shoulder over 105-108 eV, which may be assigned to be fluorinated Si species, namely, −SiF x . 12,13 The C ͑1s͒ spectrum ͑Fig. 6b͒ showed a broad band ranging from 285 to 294 eV with a prominent peak at 292.0 eV, The latter binding energy is higher than that of the carbonate species ͑290.8 eV, Fig.…”

Section: A96mentioning

confidence: 98%

“…4a, the Si spectrum shows two peaks, which are respectively attributed to Si ͑99.2 eV͒ and SiO 2 ͑103.6 eV͒. 12,13 With progressive ion-beam sputtering, the intensity of the Si peak increases, while the oxide peak exhibits decreasing intensity. The O ͑1s͒ spectrum initially shows a broad peak with the peak maximum occurring at ϳ533.4 eV, which can be attributed to OH ͑Fig.…”

Section: A96mentioning

confidence: 99%

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Study on Solid-Electrolyte-Interphase of Si and C-Coated Si Electrodes in Lithium Cells

Yen

Chao

et al. 2009

J. Electrochem. Soc.

181

157

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The solid-electrolyte-interphase ͑SEI͒ layers formed on the electrodes of pristine Si and carbon-coated Si ͑C-Si͒ particles in Li cells have been studied. The counter electrode is Li, and the electrolyte is LiPF 6 in the mixture of ethylene carbonate and ethyl methyl carbonate. Other than those, such as Li carbonates and fluoride, already known to the SEI of graphite electrode, there were detected significant amounts of SEI species unique to each of the Si electrodes. On the pristine Si electrode, there was concurrence of abundance of C and Si fluorides after long cycles. Coating the Si particles with a graphitized carbon layer has significant effects on the SEI formation. It helps to keep the Si particles remaining integrated after cycling, resulting in a smooth superficial SEI layer. It removes the native oxide layer not only to reduce humidity contamination but also to significantly change the SEI compositions. The SEI of the C-Si electrode shows the absence of Si and C fluorides but the presence of siloxane species. Reaction mechanisms leading to the formation of the fluoride and siloxane species have been proposed, elucidating an important role played by the native Si oxide layer. Si possesses a maximum capacity exceeding 3000 mAh/g for being a negative electrode for Li-ion batteries.1,2 Two issues are considered critical to realize this application. The first critical issue is the dramatic volume expansion and shrinkage of the Si particles during lithiation and delithiation, [3][4][5] respectively. Such cyclic volumetric variations tend to cause fast mechanical failure of the electrode structure, resulting in a very poor cycle life. A fairly large amount of literature adopting different approaches to enhance the structural robustness of the electrode has been dedicated to tackle this crucial problem. In the case of the conventional thick-film electrode made of particulate materials, for example, studies 3-8 have coated the Si particles with different conducting materials, which may serve either to enhance the conductivity of the electrode or to act as a buffer to partially accommodate the volumetric variations during cycling. In particular, coating with a carbon/graphite surface layer 3-6 has shown a significant beneficial effect on enhancing cycle life.The second critical issue is the properties of the surface layer on Si in contact with the Li + -containing electrolyte, also known as the solid-electrolyte-interphase ͑SEI͒. The SEI properties, on either cathode or anode, have been well recognized to play an important role in, among others, the safety, power capability, and cycle life of Li-ion-based batteries. It is believed to be equally important to the electrochemical performance of Si anode. Unfortunately, study on this critical issue is scarce. Choi et al.9,10 once reported preliminary results on the effects of certain electrolyte additive and salt on the SEI compositions of Si thin-film electrodes.In this work, the morphology and composition of the SEI formed on the electrodes containing either pris...

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Section: A96mentioning

confidence: 98%

Section: A96mentioning

confidence: 99%

Study on Solid-Electrolyte-Interphase of Si and C-Coated Si Electrodes in Lithium Cells

Yen

Chao

et al. 2009

J. Electrochem. Soc.

181

157

View full text Add to dashboard Cite

show abstract

“…Fig. 4(a) show that two major components are needed to fit the as observed Si 2p peaks of the a-SiCN: H ([N] = 0): one is a low-energy peaked at 100.1 eV, and it is the dominant component of the total Si 2p line attributed to Si-C [35]. Another minor component, which has a higher-energy (101.2 eV), can be assigned to Si-N [27] (most probably due to the contamination of the reactor by NH 3 prior to deposition).…”

Section: Xps Analysismentioning

confidence: 99%

“…It is worth mentioning that the Si 2p deconvoluted spectrum consists of three components [Fig. 4 (d)]; (i) the first component, assigned to Si-C [37] is centered at 100.5 eV and its relative area is~44.2%; (ii) the second component, centered at 101.5 eV with a relative area of~48% could be assigned to Si-N [38,39] and (iii) the third minor component centered at 102.5 eV, and its relative area represents~7.8%. This component may be due to silicon present in the form of Si-O or Si-N [38].…”

Section: Xps Analysismentioning

confidence: 99%

Structural and mechanical properties of amorphous silicon carbonitride films prepared by vapor-transport chemical vapor deposition

Awad

Khakani

Aktik

et al. 2009

Surface and Coatings Technology

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“…A non-aqueous electrolyte medium is indispensably employed to electrodeposit Si. Several papers have been published on the electrodeposition of Si [1][2][3][4][5][6][7][8][9][10]. Organic solvents such as propylene carbonate [1], tetrahydrofuran [2], and acetonitrile [3] were often employed as non-aqueous solvents in the 1980s.…”

Section: Introductionmentioning

confidence: 99%