Journal ArticleDOI
Carbon-Interconnected Ge Nanocrystals as an Anode with Ultra-Long-Term Cyclability for Lithium Ion Batteries
Duc Tung Ngo,Ramchandra S. Kalubarme,Hang T.T. Le,John Fisher,Choong-Nyeon Park,Il-Doo Kim,Chan-Jin Park +6 more
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TLDR
In this article, a facile synthetic route is introduced for producing nanometer-sized Ge crystallites interconnected by carbon (GEC) via thermal decomposition of a Ge-citrate complex followed by a calcination process in an inert atmosphere.Abstract:
Germanium (Ge) possesses a great potential as a high-capacity anode material for lithium ion batteries but suffers from its poor capacity retention and rate capability due to significant volume expansion by lithiation. Here, a facile synthetic route is introduced for producing nanometer-sized Ge crystallites interconnected by carbon (GEC) via thermal decomposition of a Ge-citrate complex followed by a calcination process in an inert atmosphere. The GEC electrode shows outstanding electrochemical performance, i.e., an almost 98.8% capacity retention of 1232 mAh g−1, even after 1000 cycles at the rate of C/2. Importantly, a high discharge capacity of 880 mAh g−1 is maintained at the very high rate of 10 C. The excellent anode performance of GEC stems from both effective buffering of carbon anchored to the Ge nanocrystals and the high open porosity of the GEC aggregated powder with an average pore diameter of 32 nm. Furthermore, the interfacial layer formed between Ge and carbon plays an essential role in prolonging the cycle life. The GEC electrode can be successfully employed as an anode for next generation lithium ion batteries.read more
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3D nitrogen-doped graphene foam with encapsulated germanium/nitrogen-doped graphene yolk-shell nanoarchitecture for high-performance flexible Li-ion battery
TL;DR: This work paves a way to develop the 3D interconnected graphene-based high-capacity electrode material systems, particularly those that suffer from huge volume expansion, for the future development of high-performance flexible energy storage systems.
Journal ArticleDOI
High capacity group-IV elements (Si, Ge, Sn) based anodes for Lithium-ion Batteries
TL;DR: In this article, the authors present an overview of the recently developed strategies for improving the group IV elements (Si, Ge, Sn)-based anodes performances in lithium-ion batteries to provide a further insight understanding in designing novel anodes.
Journal ArticleDOI
Mass-scalable synthesis of 3D porous germanium–carbon composite particles as an ultra-high rate anode for lithium ion batteries
TL;DR: In this article, a 3D nano-architecture of Ge coated with carbon (3D-Ge/C) via a carbothermal reduction method in an inert atmosphere was presented.
Journal ArticleDOI
A Chronicle Review of Nonsilicon (Sn, Sb, Ge)-Based Lithium/Sodium-Ion Battery Alloying Anodes
Suzhe Liang,Suzhe Liang,Ya-Jun Cheng,Ya-Jun Cheng,Jin Zhu,Yonggao Xia,Peter Müller-Buschbaum +6 more
Journal ArticleDOI
Mesoporous Ge/GeO2/Carbon Lithium-Ion Battery Anodes with High Capacity and High Reversibility.
Jongkook Hwang,Changshin Jo,Min Gyu Kim,Jinyoung Chun,Eunho Lim,Seongseop Kim,Sanha Jeong,Youngsik Kim,Jinwoo Lee +8 more
TL;DR: In this paper, mesoporous composite materials (m-GeO2, m-Ge-O2/C, and m -Ge-Ge O2-C) with large pore size were synthesized by a simple block copolymer directed self-assembly.
References
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TL;DR: In this paper, a model and theoretical understanding of the Raman spectra in disordered and amorphous carbon is given, and the nature of the G and D vibration modes in graphite is analyzed in terms of the resonant excitation of \ensuremath{\pi} states and the long-range polarizability of the long range bonding.
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TL;DR: It is shown that batteries which obtain high energy density by storing charge in the bulk of a material can also achieve ultrahigh discharge rates, comparable to those of supercapacitors.
Journal ArticleDOI
High-performance lithium-ion anodes using a hierarchical bottom-up approach
TL;DR: A large-scale hierarchical bottom-up assembly route for the formation of Si on the nanoscale--containing rigid and robust spheres with irregular channels for rapid access of Li ions into the particle bulk.