Journal ArticleDOI
Micro-sized Si-C Composite with Interconnected Nanoscale Building Blocks as High-Performance Anodes for Practical Application in Lithium-Ion Batteries
Reads0
Chats0
TLDR
In this paper, a Si-C nanocomposites (e.g., nanowires, nanotubes, or nanoparticles) has been used to improve the capacity and cycling stability of high-energy-density lithium-ion batteries.Abstract:
The emerging markets of electric vehicles (EV) and plug-in hybrid electric vehicles (PHEV) generate a tremendous demand for low-cost lithium-ion batteries (LIBs) with high energy and power densities and long cycling life. [ 1–4 ] The development of such LIBs requires development of low cost, high energy-density cathode and anode materials. Conventional anode materials in commercial LIBs are primarily synthetic graphite-based materials with a capacity of ∼ 370 mAh/g. [ 5 ] Improvements in anode performance, particularly in anode capacity, are essential to achieving high energy densities in LIBs for EV and PHEV applications. Silicon has been intensively pursued as the most promising anode material for high-energy-density LIBs because of its high specifi c capacity ( > 3500 mAh/g) and abundance. [ 6 ] Despite its high capacity, Si suffers from fast capacity fading caused by its large volume change ( > 300%) during lithiation/delithiation and the serious issues stemming from this volume change, e.g., unstable solid electrolyte interphase (SEI) and disintegration (cracking and crumbling) of the electrode structure. [ 7 , 8 ] The development of Si-C nanocomposites (e.g., nanowires, nanotubes, or nanoparticles) has been widely studied. [ 9–18 ] These nanocomposites proved to be an effective method of improving capacity and cycling stability, since nano-sized Si can alleviate fracture during volume changes and the contact between Si and carbon can maintain electrical contact and improve conductivity of the nanocomposites. However, practical application of nano-sized Si materials in LIBs is diffi cult. First, achieving a high tap density is important for fabrication of high-energy LIBs for EVs and PHEVs, because it offers a high volumetric energy density. Unfortunately, the tap density of nano-sized materials is generally low, which in turn holds down their volumetric capacity. [ 19 ] Furthermore, preparation of nano-sized Si either requires chemical/physical vapor deposition or involves complicated processes, leading to costly, low-yield synthesis that is diffi cult to scale up to practical levels. [ 20–22 ] To date, the abundance of Si has not been fully capitalized upon due to lackread more
Citations
More filters
Journal ArticleDOI
A pomegranate-inspired nanoscale design for large-volume-change lithium battery anodes
TL;DR: The design is inspired by the structure of a pomegranate, where single silicon nanoparticles are encapsulated by a conductive carbon layer that leaves enough room for expansion and contraction following lithiation and delithiation, resulting in superior cyclability and Coulombic efficiency.
Journal ArticleDOI
Mesoporous silicon sponge as an anti-pulverization structure for high-performance lithium-ion battery anodes
Xiaolin Li,Meng Gu,Shenyang Y. Hu,Rhiannon Kennard,Pengfei Yan,Xilin Chen,Chong M. Wang,Michael J. Sailor,Ji-Guang Zhang,Jun Liu +9 more
TL;DR: In-situ transmission electron microscopy and continuum media mechanical calculations are combined to demonstrate that large (>20 μm) mesoporous silicon sponge prepared by the anodization method can limit the particle volume expansion at full lithiation to ~30% and prevent pulverization in bulk silicon particles.
Journal ArticleDOI
Self-healing chemistry enables the stable operation of silicon microparticle anodes for high-energy lithium-ion batteries
TL;DR: It is shown that anodes made from low-cost SiMPs, for which stable deep galvanostatic cycling was previously impossible, can now have an excellent cycle life when coated with a self-healing polymer and attain a cycle life ten times longer than state-of-art anodesmade from Si MPs and still retain a high capacity.
Journal ArticleDOI
Challenges and Recent Progress in the Development of Si Anodes for Lithium-Ion Battery
TL;DR: In this paper, the authors focus on the challenges and recent progress in the development of Si anodes for lithium-ion battery, including initial Coulombic efficiency, areal capacity, and material cost, which call for more research effort and provide a bright prospect for the widespread applications of silicon anodes in the future lithium ion batteries.
Journal ArticleDOI
Growth of conformal graphene cages on micrometre-sized silicon particles as stable battery anodes
TL;DR: In this paper, a graphene cage is grown conformally around the micro-silicon particles to improve their cycling stability, which is shown to improve the cycling stability of battery anodes.
References
More filters
Journal ArticleDOI
Li ion battery materials with core–shell nanostructures
TL;DR: This review summarizes the preparation, electrochemical performances, and structural stability of core-shell nanostructured materials for lithium ion batteries, and discusses the problems and prospects of this kind of materials.
Nanostructured Hybrid Silicon/Carbon Nanotube Heterostructures: Novel Reversible High-Capacity Lithium-Ion Anodes
TL;DR: In this article, the authors report the synthesis of 1D heterostructures comprising vertically aligned multiwall CNTs (VACNTs) containing nanoscale amorphous/nanocrystalline Si droplets deposited directly on VACNT with clearly defined spacing using a simple two-step liquid injection CVD process.
Journal ArticleDOI
Improving the Electrode Performance of Ge through Ge@C Core–Shell Nanoparticles and Graphene Networks
TL;DR: The as-synthesized Ge@C/RGO nanocomposite showed excellent cycling performance and rate capability in comparison with Ge@ C nanoparticles when used as an anode material for Li ion batteries, which can be attributed to the electronically conductive and elastic RGO networks in addition to the carbon shells and small particle sizes of Ge.
Journal ArticleDOI
Scalable Fabrication of Silicon Nanotubes and their Application to Energy Storage
TL;DR: The electrochemical activity of the obtained silicon nanotubes showed excellent cycle stability, suggesting that the hollow one-dimensional structure would be a good candidate for a high-capacity anode for a lithium ion battery.
Journal ArticleDOI
Hollow core–shell structured porous Si–C nanocomposites for Li-ion battery anodes
Xiaolin Li,Praveen Meduri,Xilin Chen,Wen N. Qi,Wen N. Qi,Mark H. Engelhard,Wu Xu,Fei Ding,Jie Xiao,Wei Wang,Chong M. Wang,Ji-Guang Zhang,Jun Liu +12 more
TL;DR: In this paper, hollow core-shell structured porous Si-C nanocomposites with void space up to tens of nanometres are designed to accommodate the volume expansion during lithiation for high-performance Li-ion battery anodes.