Journal
APPLIED SURFACE SCIENCE
Volume 511, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2020.145609
Keywords
Bread-like structure; Silicon; ZIF-8; Core-shell; Anode; Lithium-ion batteries
Categories
Funding
- National Natural Science Foundation of P. R. China [21471061, 21671071]
- special funds for scientific and technological innovation cultivation of undergraduate in Guangdong (special funds for climbing plan) key project [pdjha0128]
- Scientific Research Foundation of Graduate School of South China Normal University [2017LKXM006]
- Science and Technology Planning Project of Guangdong Province, Guangzhou, China [2015B010135009, 2017B090917002, 2019A050510038]
- cultivation foundation of South China Normal University for young teachers [17KJ07]
- Innovation team project of Guangdong Ordinary University [2015KCXTD005]
- great scientific research project of Guangdong Ordinary University [2016KZDXM023]
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Nano core-shell silicon/carbon (Si/C) composites can efficiently enhance the conductivity and accommodate the volume change for Si. However, new challenges of big specific surface area and high interparticle resistance still weaken its advantages. In order to solve the above problems, we prepared a micron bread-like Si-based composite with high Si content in it, in which buffer space in clustered core-shell units are used to relieve the stress caused by volume expansion, and the N-doped carbon skeleton derived from ZIF-8 is applied to enhance the electrical contact between adjacent core-shell units. Due to the stable bread-like structure, the integrity of stable solid electrolyte interphase layer is maintained, and the lower external surface area retains the coulombic efficiency as high as 95.5% during cycling. The specific capacities of the obtained composite are 1155 mAh g(-1) at 2 A g(-1) and 815 mAh g(-1) M 5 A g(-1) in rate performance. After long-term cycling of 500 cycles, the composite still maintains specific capacities of 1109 mAh g(-1) at 3 A g(-1) and 804 mAh g(-1) at 5 A g(-1) with ICE of 65.55% in the first three activated cycles.
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