Raman Spectral Studies on Solid State Interphase in <font>Li</font> Batteries

Li, Hong; Li, Guifeng; Mo, Yujun; Huang, Xuejie; Chen, Liquan

doi:10.1142/9789812791979_0058

Cited by 69 publications

(92 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…[10][11][12][13] Previous research has shown improvement of the electrochemical performance of Si-based anodes but only to a limited extent. [ 6 ] Alternatively, silicon anodes made of very thin fi lms (a few tens of nanometers in thickness) have been reported to display a stable capacity over many cycles, [14][15][16] whereas an increase in fi lm thickness was urgently required to provide suffi cient active material. Unfortunately, stress-induced cracking and the high inherent resistance of silicon lead to a poor cycling performance and rate capability owing to an increase in fi lm thickness.…”

Section: Doi: 101002/adma201003017mentioning

confidence: 99%

Nickel Nanocone‐Array Supported Silicon Anode for High‐Performance Lithium‐Ion Batteries

et al. 2010

View full text Add to dashboard Cite

Section: Doi: 101002/adma201003017mentioning

confidence: 99%

Nickel Nanocone‐Array Supported Silicon Anode for High‐Performance Lithium‐Ion Batteries

et al. 2010

View full text Add to dashboard Cite

“…Many studies have been devoted to examining the mechanism of formation of Li alloys, and much effort has been expended on characterizing the cracking phenomenon in order to minimize it in the case of Si. [16][17][18][19][20][21] It is expected that a reduction of the particle and crystallite size to the nanometer regime (for powders and thin films) will have a positive influence on the cycling behavior, [11,13,14] since the mechanical stress developed during the lithiation process might perhaps be reduced or even avoided. [22][23][24] Furthermore, for Si thin films, the retention capacity is enhanced because of the strong adhesion of the active material to the conductive support (thus maintaining electrical contact) during cycling.…”

Section: Introductionmentioning

confidence: 99%

Towards a Fundamental Understanding of the Improved Electrochemical Performance of Silicon–Carbon Composites

Saint¹,

Morcrette²,

Larcher³

et al. 2007

Adv Funct Materials

274

203

View full text Add to dashboard Cite

Silicon–carbon composites consisting of Si particles embedded in a dense and non‐porous carbon matrix are prepared by the pyrolysis of intimate mixtures of poly(vinyl chloride) (PVC) and Si powder at 900 °C under a flow of N2. In contrast to bare micrometer‐sized (1–10 μm) and nanometer‐sized (10–100 nm) Si powders, which show poor cycling behavior with almost no capacity remaining after 15 cycles, the texture of the composite is seen to greatly enhance the reversibility of the alloying reaction of Si with Li. For instance, a capacity of ca. 1000 mA h g–1 is achieved for 20 cycles (0–2.0 V vs. Li+/Li) for a silicon–carbon composite containing nanometer‐sized Si particles. We also demonstrate that a mild manual grinding treatment degrades the cycling performance of the composites to levels as low as the parent Si, even though free Si is not released. The electrochemical measurements in conjunction with Raman spectroscopy data indicate that a huge stress is exerted on the Si domains by the in situ formed carbon. This carbon‐induced stress is found to disappear during the milling of the composites, indicating that the carbon‐induced pressure, along with the accompanying improvement in electrical connectivity, are the key parameters for the improved cycling behavior of Si versus Li.

show abstract

“…3,4 To solve the first problem, Si negative electrodes were prepared with nano-sized Si powders and a partial improvement was achieved by reducing the absolute volume change. [5][6][7] For the second problem, Si powders were fabricated as a composite with conductive carbon, metal or ceramic materials. [8][9][10][11][12][13][14][15] The prime concern in this work is the identification of failure modes in Si powder negative electrodes.…”

mentioning

confidence: 99%

Failure Modes of Silicon Powder Negative Electrode in Lithium Secondary Batteries

Ryu

Kim

Sung

et al. 2004

Electrochem. Solid-State Lett.

624

492

View full text Add to dashboard Cite

Si composite negative electrodes for lithium secondary batteries degrade in the dealloying period with an abrupt increase in internal resistance that is caused by a breakdown of conductive network made between Si and carbon particles. This results from a volume contraction of Si particles after expansion in the previous alloying process. Due to the large internal resistance, the dealloying reaction is not completed while Si remains as a lithiated state. The anodic performance is greatly improved either by applying a pressure on the cells or loading a larger amount of conductive carbon in the composite electrodes.

show abstract

Raman Spectral Studies on Solid State Interphase in Li Batteries

Cited by 69 publications

References 1 publication

Nickel Nanocone‐Array Supported Silicon Anode for High‐Performance Lithium‐Ion Batteries

Nickel Nanocone‐Array Supported Silicon Anode for High‐Performance Lithium‐Ion Batteries

Towards a Fundamental Understanding of the Improved Electrochemical Performance of Silicon–Carbon Composites

Failure Modes of Silicon Powder Negative Electrode in Lithium Secondary Batteries

Contact Info

Product

Resources

About