A Lithium-Ion Capacitor electrical model considering pore size dispersion

AbstractLithium-ion capacitors are envisaged as promising energy-storage devices to simultaneously achieve a large energy density and high-power output at quick charge and discharge rates. However, the mismatched kinetics between capacitive cathodes and faradaic anodes still hinder their practical application for high-power purposes. To tackle this problem, the electron and ion transport of both electrodes should be substantially improved by targeted structural design and controllable chemical doping. Herein, nitrogen-enriched graphene frameworks are prepared via a large-scale and ultrafast magnesiothermic combustion synthesis using CO2 and melamine as precursors, which exhibit a crosslinked porous structure, abundant functional groups and high electrical conductivity (10524 S m−1). The material essentially delivers upgraded kinetics due to enhanced ion diffusion and electron transport. Excellent capacities of 1361 mA h g−1 and 827 mA h g−1 can be achieved at current densities of 0.1 A g−1 and 3 A g−1, respectively, demonstrating its outstanding lithium storage performance at both low and high rates. Moreover, the lithium-ion capacitor based on these nitrogen-enriched graphene frameworks displays a high energy density of 151 Wh kg−1, and still retains 86 Wh kg−1 even at an ultrahigh power output of 49 kW kg−1. This study reveals an effective pathway to achieve synergistic kinetics in carbon electrode materials for achieving high-power lithium-ion capacitors.

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Lithium Storage in Carbon Cloth–Supported KNb 3 O 8 Nanorods Toward a High‐Performance Lithium‐Ion Capacitor

Small Structures ◽

10.1002/sstr.202100029 ◽

2021 ◽

pp. 2100029

Author(s):

Hui Sun ◽

Fei Niu ◽

Peng Yuan ◽

Xuexia He ◽

Jie Sun ◽

...

Keyword(s):

High Performance ◽

Lithium Ion ◽

Carbon Cloth ◽

Lithium Storage ◽

Lithium Ion Capacitor

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Two-dimensional SnO2 anchored biomass-derived carbon nanosheet anode for high-performance Li-ion capacitors

RSC Advances ◽

10.1039/d1ra00822f ◽

2021 ◽

Vol 11 (17) ◽

pp. 10018-10026

Author(s):

Chang Liu ◽

Zeyin He ◽

Jianmin Niu ◽

Qiang Cheng ◽

Zongchen Zhao ◽

...

Keyword(s):

High Performance ◽

Lithium Ion ◽

High Energy ◽

Good Combination ◽

Two Dimensional ◽

Power Characteristics ◽

Coffee Grounds ◽

Lithium Ion Capacitor ◽

Li Ion

In this work, we have fabricated lithium-ion capacitor using SnO2/PCN as anode and waste coffee grounds derived PCN as cathode, which delivers good combination of high energy and power characteristics.

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Novel Lithium-Ion Capacitor Based on a NiO-rGO Composite

Materials ◽

10.3390/ma14133586 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3586

Author(s):

Qi An ◽

Xingru Zhao ◽

Shuangfu Suo ◽

Yuzhu Bai

Keyword(s):

Energy Storage ◽

Energy Density ◽

Power Density ◽

High Power ◽

Specific Capacity ◽

Lithium Ion ◽

High Energy ◽

Cycle Life ◽

High Energy Density ◽

Lithium Ion Capacitor

Lithium-ion capacitors (LICs) have been widely explored for energy storage. Nevertheless, achieving good energy density, satisfactory power density, and stable cycle life is still challenging. For this study, we fabricated a novel LIC with a NiO-rGO composite as a negative material and commercial activated carbon (AC) as a positive material for energy storage. The NiO-rGO//AC system utilizes NiO nanoparticles uniformly distributed in rGO to achieve a high specific capacity (with a current density of 0.5 A g−1 and a charge capacity of 945.8 mA h g−1) and uses AC to provide a large specific surface area and adjustable pore structure, thereby achieving excellent electrochemical performance. In detail, the NiO-rGO//AC system (with a mass ratio of 1:3) can achieve a high energy density (98.15 W h kg−1), a high power density (10.94 kW kg−1), and a long cycle life (with 72.1% capacity retention after 10,000 cycles). This study outlines a new option for the manufacture of LIC devices that feature both high energy and high power densities.

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A high-voltage aqueous lithium ion capacitor with high energy density from an alkaline–neutral electrolyte

Journal of Materials Chemistry A ◽

10.1039/c8ta11735g ◽

2019 ◽

Vol 7 (8) ◽

pp. 4110-4118 ◽

Cited By ~ 20

Author(s):

Chunyang Li ◽

Wenzhuo Wu ◽

Shuaishuai Zhang ◽

Liang He ◽

Yusong Zhu ◽

...

Keyword(s):

Energy Density ◽

High Voltage ◽

Lithium Ion ◽

High Energy ◽

High Energy Density ◽

Carbon Anode ◽

Biomass Carbon ◽

Proof Of Concept ◽

Lithium Ion Capacitor ◽

Neutral Electrolyte

A proof-of-concept lithium ion capacitor comprising LiMn2O4 nanorods as the cathode, a nitrogen-rich biomass carbon anode and a stable alkaline–neutral electrolyte was designed and fabricated.

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The Synthesis and Electrochemical Performance of Si Composite with Hollow Carbon Microtubes by the Carbonization of Milkweed from Nature as Anode Template for Lithium Ion Batteries

Energies ◽

10.3390/en13195124 ◽

2020 ◽

Vol 13 (19) ◽

pp. 5124

Author(s):

Eun Hyuk Chung ◽

Jong Pil Kim ◽

Hyun Gyu Kim ◽

Jae-Min Chung ◽

Sei-Jin Lee ◽

...

Keyword(s):

Electron Microscopy ◽

Electrical Conductivity ◽

Electrochemical Performance ◽

Pore Size ◽

Lithium Ion Batteries ◽

Polyvinylidene Fluoride ◽

Lithium Ion ◽

Size Analysis ◽

Pore Size Analysis ◽

Hollow Carbon

It has been reported that improving electrical conductivity and maintaining stable structure during discharge/charge process are challenge for Si to be used as an anode for lithium ion batteries (LIB). To address this problem, milkweed (MW) was carbonized to prepare hollow carbon microtubes (HCMT) derived from biomass as an anode template for LIB. In order to improve electrical conductivity, various materials such as chitosan (CTS), agarose, and polyvinylidene fluoride (PVDF) are used as carbon source (C1, C2, and C3) by carbonization. Carbon coated HCMT@Si composits, HCMT@Si@C1, HCMT@Si@C1@C2, and HCMT@Si@C1@C3, have been successfully synthesized. Changes in structure and crystallinity of HCMT@Si composites were characterized by using X-ray diffraction (XRD). Specific surface area for samples was calculated by using BET (Brunauer–Emmett–Teller). Also, pore size and particle size were obtained by particle and pore size analysis system. The surface morphology was evaluated using high resolution scanning electron microscopy (HR-SEM), Field Emission transmission electron microscopy (TEM). The thermal properties of HCMT@Si composites were analyzed by thermogravimetric analysis (TGA). Our research was performed to study the synthesis and electrochemical performance of Si composite with HCMT by the carbonization of natural micro hollow milkweed to form an inner space. After carbonization at 900 °C for 2 h in N2 flow, inner diameter of HCMT obtained was about 10 μm. The electrochemical tests indicate that HCMT@Si@C1@C3 exhibits discharge capacity of 932.18 mAh/g at 0.5 A/g after 100 cycles.

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