Journal
ELECTROCHIMICA ACTA
Volume 312, Issue -, Pages 242-250Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.04.170
Keywords
Hollow porous carbon microsphere; Nano-Si; Submicron mesh pore structure; Coupling agent; Lithium-ion battery
Categories
Funding
- National Natural Science Foundation of China
- Guangdong Province [U1601214, U1501244]
- Guangdong Innovative Research Team Program [2013C102]
- Natural Science Foundation of Guangdong Province [2017A030310166]
- Scientific and Technological Plan of Guangdong Province [2018B050502010, 2017B090901027, 2016B090909001]
- Guangdong Provincial Key Laboratory of Optical Information Materials and Technology [2017B030301007]
- MOE International Laboratory for Optical Information Technologies
- 111 Project
- Project of Blue Fire Plan [CXZJHZ201708, CXZJHZ201709]
- important Sci.-Tech. Plan of Guangxi and Guilin innovation-driven [AA17204022, 20160204]
- Innovation Project of Graduate School of South China Normal University [2018LKXM013]
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Silicon (Si) applied for lithium-ion battery anode is of immense prospect due to high theoretical capacity, non-toxic, abundant reserves and low-cost. But the electrode materials, maintaining stable structure during repeated discharge/charge processes, need to be explored, which can realize the long-life. To address this problem, we utilized hollow porous pollen carbon microsphere derived from biomass as hard template to accommodate nano-Si. The hollow porous carbon@nano-Si@graphene sheets (HPC@nano-Si@GS) microspheres with hollow double spherical interlayer and submicron porous structure have been successfully synthesized via a simple and green environment-protecting wet-chemical method. We decorate nano-Si with silane coupling agent which can bind hollow porous pollen and graphene oxide, realizing the strong fixation and protection of nano-Si. Furthermore, the surface submicron mesh pores and HPC microsphere provide enough buffer space to cushion the huge volume expansion for nano-Si, enhancing the cyclic stability. Finally, graphene wrapping on the surface of HPC@nano-Si@GS microspheres can protect nano-Si very well, further stabilizing the composite structure. Nano-Si particles were accommodated in the HPC microsphere with submicron pores and then coated by wrinkled graphene sheets, to form the strong structure with hollow double spherical interlayer. A series of electrochemical tests indicate that prepared HPC@nano-Si@GS microspheres with hollow porous carbon structure exhibit outstanding electrochemical properties. (C) 2019 Elsevier Ltd. All rights reserved.
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