Nanostructured Si-C Composites As High-Capacity Anode Material For All-Solid-State Lithium-Ion Batteries

Silicon carbon void structures (Si-C) are attractive anode materials for Lithium-ion batteries to cope with the volume changes of silicon during cycling. In this study, Si-C with varying Si contents (28 ‑ 37 %) are evaluated in all-solid-state batteries (ASSBs) for the first time. The carbon matrix enables enhanced performance and lifetime of the Si-C composites compared to bare silicon nanoparticles in half-cells even at high loadings of up to 7.4 mAh cm-2. In full cells with nickel-rich NCM (LiNi0.9Co0.05Mn0.05O2, 210 mAh g-1), kinetic limitations in the anode lead to a lowered voltage plateau compared to NCM half-cells. The solid electrolyte (Li6PS5Cl, 3 mS cm-1) does not penetrate the Si-C void structure resulting in less side reactions and higher initial coulombic efficiency compared to a liquid electrolyte (72.7 % vs. 31.0 %). Investigating the influence of balancing of full cells using 3-electrode ASSB cells revealed a higher delithiation of the cathode as a result of the higher cut-off voltage of the anode at high n/p ratios. During galvanostatic cycling, full cells with either a low or rather high overbalancing of the anode showed the highest capacity retention of up to 87.7 % after 50 cycles.

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Карбонизация нанокристаллического кремния с помощью фторуглерода

Письма в журнал технической физики ◽

10.21883/pjtf.2019.13.47954.17818 ◽

2019 ◽

Vol 45 (13) ◽

pp. 29

Author(s):

Е.В. Астрова ◽

В.П. Улин ◽

А.В. Парфеньева ◽

В.Б. Воронков

Keyword(s):

Composite Materials ◽

Porous Silicon ◽

Silicon Nanoparticles ◽

High Capacity ◽

Lithium Ion ◽

Carbon Matrix ◽

Carbon Nanocomposites ◽

Matrix Density ◽

Silicon Carbon ◽

Negative Electrodes

A new method for formation of porous silicon-carbon nanocomposites is proposed. It is based on reduction of carbon monofluoride by silicon. The resulting composite materials consist of silicon nanoparticles enclosed in a carbon shell. The contacts of such particles ensure the flow of current through the arising carbon matrix. Density, porosity and resistivity on the composition of the Si-C tablets obtained by the proposed method are determined. The materials under the study are of interest for high-capacity negative electrodes of lithium-ion batteries.

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Electrospun Polyethene oxide-graphite composite anode for solid-state lithium-ion batteries

10.31224/osf.io/cn4j6 ◽

2018 ◽

Author(s):

Mikel Arrese-Igor ◽

Norbert Radacsi

Keyword(s):

Solid State ◽

Lithium Ion Batteries ◽

High Capacity ◽

Lithium Ion ◽

Liquid Electrolyte ◽

Promising Alternative ◽

Graphite Composite ◽

Graphite Particles ◽

Solid State Batteries ◽

Optimized Conditions

Current lithium-ion batteries are close to reaching their physicochemical energy density limit. Moreover, they present high operation risks regarding their liquid electrolyte. Solid-state batteries are a promising alternative to overcome these problems. They offer safe operation, and potentially improved energy and power density. The option of operating at higher voltages has led to the possibility of employing high capacity electrodes. In this study, the synthesis of a nanostructured anode through electrospinning was carried out. This electrode is based on polymer nanofibres with intercalated graphite particles. The effect of molecular weight, voltage, temperature and humidity has been studied for the formation of smooth and uniform nanofibres. At the optimized conditions, Polyethylene oxide (PEO)-Polyethylene glycol (PEG) nanofibres with diameters around 600 nm were successfully electrospun. The effect of graphite loading on the electrospinning of this solution was also studied. A 30% graphite particle loading in the final fibres was reached with a reproducible methodology. It was found that the electrospun graphite particles received a polymer coating during electrospinning. EDX analysis confirmed that most of the graphite particles are covered by a polymer layer, confirming this hypothesis. Even if it is unclear how this affects the behaviour of the graphite for energy storage, high graphite content was electrospun together with PEO nanofibres with a new methodology.

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FePO4 nanoparticles embedded in a large mesoporous carbon matrix as a high-capacity and high-rate cathode for lithium-ion batteries

Electrochimica Acta ◽

10.1016/j.electacta.2013.01.048 ◽

2013 ◽

Vol 92 ◽

pp. 433-437 ◽

Cited By ~ 18

Author(s):

Lian Chen ◽

Ping Wu ◽

Kongwei Xie ◽

Jianping Li ◽

Bin Xu ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Mesoporous Carbon ◽

High Capacity ◽

Lithium Ion ◽

Carbon Matrix ◽

High Rate

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Solutions for the problems of silicon–carbon anode materials for lithium-ion batteries

Royal Society Open Science ◽

10.1098/rsos.172370 ◽

2018 ◽

Vol 5 (6) ◽

pp. 172370 ◽

Cited By ~ 16

Author(s):

Xuyan Liu ◽

Xinjie Zhu ◽

Deng Pan

Keyword(s):

Lithium Ion Batteries ◽

Anode Materials ◽

High Capacity ◽

Lithium Ion ◽

Cycling Performance ◽

Carbon Anode ◽

Environmental Friendliness ◽

Silicon Carbon ◽

New Energy ◽

Carbon Anodes

Lithium-ion batteries are widely used in various industries, such as portable electronic devices, mobile phones, new energy car batteries, etc., and show great potential for more demanding applications like electric vehicles. Among advanced anode materials applied to lithium-ion batteries, silicon–carbon anodes have been explored extensively due to their high capacity, good operation potential, environmental friendliness and high abundance. Silicon–carbon anodes have demonstrated great potential as an anode material for lithium-ion batteries because they have perfectly improved the problems that existed in silicon anodes, such as the particle pulverization, shedding and failures of electrochemical performance during lithiation and delithiation. However, there are still some problems, such as low first discharge efficiency, poor conductivity and poor cycling performance, which need to be improved. This paper mainly presents some methods for solving the existing problems of silicon–carbon anode materials through different perspectives.

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Silicon-Carbon Nanotube Aerogel Core-Shell Nanostructures for Lithium-Ion Batteries with Long-Cycle Life and High Capacity

ECS Meeting Abstracts ◽

10.1149/ma2016-02/3/276 ◽

2016 ◽

Keyword(s):

Carbon Nanotube ◽

Lithium Ion Batteries ◽

High Capacity ◽

Lithium Ion ◽

Cycle Life ◽

Core Shell ◽

Long Cycle ◽

Long Cycle Life ◽

Shell Nanostructures ◽

Silicon Carbon

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High-Capacity and Highly Reversible Silicon-Tin Hybrid Anode for Solid-State Lithium-Ion Batteries

Journal of The Electrochemical Society ◽

10.1149/2.0701602jes ◽

2015 ◽

Vol 163 (2) ◽

pp. A251-A254 ◽

Cited By ~ 9

Author(s):

Justin M. Whiteley ◽

Ji Woo Kim ◽

Daniela Molina Piper ◽

Se-Hee Lee

Keyword(s):

Solid State ◽

Lithium Ion Batteries ◽

High Capacity ◽

Lithium Ion

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Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

Beilstein Journal of Nanotechnology ◽

10.3762/bjnano.7.120 ◽

2016 ◽

Vol 7 ◽

pp. 1289-1295 ◽

Cited By ~ 5

Author(s):

Mengting Liu ◽

Wenhe Xie ◽

Lili Gu ◽

Tianfeng Qin ◽

Xiaoyi Hou ◽

...

Keyword(s):

Carbon Nanofibers ◽

Coulombic Efficiency ◽

High Capacity ◽

Lithium Ion ◽

Carbon Matrix ◽

Reversible Capacity ◽

Excellent Electrochemical Performance ◽

Rate Capacity ◽

Binder Free ◽

Carbon Network

A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability. Under a current density of 0.2 A g−1, it delivered a high reversible capacity of 875.5 mAh g−1 after 200 cycles and 1005.5 mAh g−1 after 250 cycles with a significant coulombic efficiency of 99.5%.

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