SiO2-Enhanced Structural Stability and Strong Adhesion with a New Binder of Konjac Glucomannan Enables Stable Cycling of Silicon Anodes for Lithium-Ion Batteries

Guo, Songtao; Li, Heng; Li, Yaqian; Han, Yong; Chen, Kebei; Xu, Gengzhao; Zhu, Yingjie; Hu, Xianluo

doi:10.1002/aenm.201800434

Title: SiO₂-Enhanced Structural Stability and Strong Adhesion with a New Binder of Konjac Glucomannan Enables Stable Cycling of Silicon Anodes for Lithium-Ion Batteries

Journal Article · Mon Jun 25 00:00:00 EDT 2018 · Advanced Energy Materials

DOI:https://doi.org/10.1002/aenm.201800434· OSTI ID:1459534

Guo, Songtao ^[1]; Li, Heng ^[2]; Li, Yaqian ^[1]; Han, Yong ^[3]; Chen, Kebei ^[4]; Xu, Gengzhao ^[4]; Zhu, Yingjie ^[5];

^[1]

Huazhong Univ. of Science and Technology, Wuhan (China). State Key Lab. of Materials Processing and Die & Mould Technology. School of Materials Science and Engineering
Huazhong Univ. of Science and Technology, Wuhan (China). State Key Lab. of Materials Processing and Die & Mould Technology. School of Materials Science and Engineering; Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics. State Key Lab. of High Performance Ceramics and Superfine Microstructure; Univ. of Chinese Academy of Sciences, Beijing (China)
Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
Chinese Academy of Sciences (CAS), Suzhou (China). Suzhou Inst. of Nano-Tech and Nano-Bionics
Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Ceramics. State Key Lab. of High Performance Ceramics and Superfine Microstructure; Univ. of Chinese Academy of Sciences, Beijing (China)

Abstract Silicon‐based anodes with high theoretical capacity have intriguing potential applications for next‐generation high‐energy lithium‐ion batteries, but suffer from huge volumetric change that causes pulverization of electrodes. Rational design and construction of effective electrode structures combined with versatile binders remain a significant challenge. Here, a unique natural binder of konjac glucomannan (KGM) is developed and an amorphous protective layer of SiO ₂ is fabricated on the surface of Si nanoparticles (Si@SiO ₂ ) to enhance the adhesion. Benefiting from a plethora of hydroxyl groups, the KGM binder with inherently high adhesion and superior mechanical properties provides abundant contact sites to active materials. Molecular mechanics simulations and experimental results demonstrate that the enhanced adhesion between KGM and Si@SiO ₂ can bond the particles tightly to form a robust electrode. In addition to bridging KGM molecules, the SiO ₂ ‐functionalized surface may serve as a buffer layer to alleviate the stresses of Si nanoparticles resulting from the volume change. The as‐fabricated KGM/Si@SiO ₂ electrode exhibits outstanding structural stability upon long‐term cycles. A highly reversible capacity of 1278 mAh g ⁻¹ can be achieved over 1000 cycles at a current density of 2 A g ⁻¹ , and the capacity decay is as small as 0.056% per cycle.

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Research Organization:: Ames Lab. and Iowa State Univ., Ames, IA (United States); Huazhong Univ. of Science and Technology, Wuhan (China); Chinese Academy of Sciences (CAS), Shanghai (China); Chinese Academy of Sciences (CAS), Suzhou (China)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC); Ministry of Science and Technology of the People's Republic of China

Grant/Contract Number:: AC02-07CH11358; 51772116; 51522205; 51472098; 2015AA034601

OSTI ID:: 1459534

Alternate ID(s):: OSTI ID: 1457194

Report Number(s):: IS-J-9570

Journal Information:: Advanced Energy Materials, Vol. 8, Issue 24; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 122 works

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