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Title: Facile electrostatic self-assembly of silicon/reduced graphene oxide porous composite by silica assist as high performance anode for Li-ion battery

Journal Article · · Applied Surface Science
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [3]
  1. Southwest Petroleum Univ., Chengdu (China). The Center of New Energy Materials and Technology and School of Materials Science and Engineering
  2. China Academy of Engineering Physics, Mianyang (China). Inst. of Materials
  3. Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Energy and Environment Directorate

Silicon(Si)/graphene composite has been regarded as one of the most promising candidates for next generation anode materials with high power and energy density in lithium ion batteries. Introduction of graphene in Si anodes could improve the electronic conductivity, suppress the severe volume expansion of Si, and facilitate the formation of stable solid electrolyte interphase, etc. However, traditionally mechanical mixing of Si and graphene cannot realize uniform distribution of Si particles on the graphene sheets, which would largely weaken the effectiveness of the graphene in the composite. In this study, nano-Si/reduced graphene oxide porous composite (p Si/rGO) has been fabricated by a facile electrostatic self-assembly approach via using SiO2 as the sacrificial template. Compared with the simply mechanically mixed nano-Si and rGO (Si/rGO), the nano-Si particles could be more uniformly dispersed among the rGO sheets in the p Si/rGO, which significantly increases its electronic conductivity. Moreover, the drastic volume expansion of nano-Si during repeated lithiation/delithiation cycles also has been effectively accommodated by the large number of pores left after removing the SiO2 template in the composite. Thus, the p Si/rGO presented largely enhanced electrochemical performances, showing a high reversible capacity up to 1849 mA h g-1 at 0.2 A g-1 with good capacity retention, and high rate capability (535 mA h g-1 at 2 A g-1).

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; National Natural Science Foundation of China (NSFC); Sichuan Provincial Government (China)
Grant/Contract Number:
AC0576RL01830; 51502250; 51604250; 51474196; 51302232; 2015JY0089; 2016RZ0071; 16ZB0085; 2015CXTD04; X151517KCL34; 201710615031
OSTI ID:
1457750
Report Number(s):
PNNL-SA-135998; PII: S0169433218317148
Journal Information:
Applied Surface Science, Vol. 456, Issue C; ISSN 0169-4332
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (5)


Figures / Tables (6)