气候变化领域集成服务门户(CCPortal): Self-healing SEI enables full-cell cycling of a silicon-majority anode with a coulombic efficiency exceeding 99.9%

CCPortal

DOI	10.1039/c6ee02685k
	Self-healing SEI enables full-cell cycling of a silicon-majority anode with a coulombic efficiency exceeding 99.9%
	Jin Y.; Li S.; Kushima A.; Zheng X.; Sun Y.; Xie J.; Sun J.; Xue W.; Zhou G.; Wu J.; Shi F.; Zhang R.; Zhu Z.; So K.; Cui Y.; Li J.
发表日期	2017
ISSN	17545692
起始页码	580
结束页码	592
卷号	10 期号:2
英文摘要	Despite active developments, full-cell cycling of Li-battery anodes with >50 wt% Si (a Si-majority anode, SiMA) is rare. The main challenge lies in the solid electrolyte interphase (SEI), which when formed naturally (nSEI), is fragile and cannot tolerate the large volume changes of Si during lithiation/delithiation. An artificial SEI (aSEI) with a specific set of mechanical characteristics is henceforth designed; we enclose Si within a TiO2 shell thinner than 15 nm, which may or may not be completely hermetic at the beginning. In situ TEM experiments show that the TiO2 shell exhibits 5x greater strength than an amorphous carbon shell. Void-padded compartmentalization of Si can survive the huge volume changes and electrolyte ingression, with a self-healing aSEI + nSEI. The half-cell capacity exceeds 990 mA h g-1 after 1500 cycles. To improve the volumetric capacity, we further compress SiMA 3-fold from its tap density (0.4 g cm-3) to 1.4 g cm-3, and then run the full-cell battery tests against a 3 mA h cm-2 LiCoO2 cathode. Despite some TiO2 enclosures being inevitably broken, 2x the volumetric capacity (1100 mA h cm-3) and 2x the gravimetric capacity (762 mA h g-1) of commercial graphite anode is achieved in stable full-cell battery cycling, with a stabilized areal capacity of 1.6 mA h cm-2 at the 100th cycle. The initial lithium loss, characterized by the coulombic inefficiency (CI), is carefully tallied on a logarithmic scale and compared with the actual full-cell capacity loss. It is shown that a strong, non-adherent aSEI, even if partially cracked, facilitates an adaptive self-repair mechanism that enables full-cell cycling of a SiMA, leading to a stabilized coulombic efficiency exceeding 99.9%. © The Royal Society of Chemistry 2017.
英文关键词	Amorphous carbon; Anodes; Carbon; Efficiency; Electric batteries; Electrodes; Electrolytes; Lithium batteries; Seebeck effect; Silicon; Solid electrolytes; Titanium dioxide; Battery cycling; Coulombic efficiency; Graphite anode; Gravimetric capacity; Logarithmic scale; Mechanical characteristics; Solid electrolyte interphase; Volumetric capacity; Secondary batteries; carbon; Coulomb criterion; electrode; electrolyte; fuel cell; gravimetry; lithium; silicon; titanium; volume change
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190533
作者单位	State Key Lab of Electrical Insulation and Power Equipment, School of Electrical Engineering, Xi'an Jiaotong University, Xi'an, 710049, China; Department of Nuclear Science and Engineering, Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, United States; Department of Materials Science and Engineering, Stanford University, Stanford, CA 94305, United States; School of Materials Science and Engineering, Tongji University, 4800 Caoan Road, Shanghai, 201804, China; Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, United States
推荐引用方式 GB/T 7714	Jin Y.,Li S.,Kushima A.,et al. Self-healing SEI enables full-cell cycling of a silicon-majority anode with a coulombic efficiency exceeding 99.9%[J],2017,10(2).
APA	Jin Y..,Li S..,Kushima A..,Zheng X..,Sun Y..,...&Li J..(2017).Self-healing SEI enables full-cell cycling of a silicon-majority anode with a coulombic efficiency exceeding 99.9%.Energy & Environmental Science,10(2).
MLA	Jin Y.,et al."Self-healing SEI enables full-cell cycling of a silicon-majority anode with a coulombic efficiency exceeding 99.9%".Energy & Environmental Science 10.2(2017).