A new type of cyclic silicone additive for improving the energy density and power density of Li–O2 batteries

2018 ◽  
Vol 6 (16) ◽  
pp. 7221-7226 ◽  
Author(s):  
Chunguang Chen ◽  
Xiang Chen ◽  
Xiuhui Zhang ◽  
Liangyu Li ◽  
Congcong Zhang ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Discharge Capacity ◽  
Rate Capability ◽  
Electrolyte Additive ◽  
Silicone Additive ◽  
New Type

In this work, a novel electrolyte additive, octamethylcyclotetrasiloxane (OMTS), is applied to Li–O2 batteries to increase their practical discharge capacity and also their rate capability.

scholarly journals The Ultrafast Laser Ablation of Li(Ni0.6Mn0.2Co0.2)O2 Electrodes with High Mass Loading

2019 ◽  
Vol 9 (19) ◽  
pp. 4067 ◽  
Author(s):  
Penghui Zhu ◽  
Hans Jürgen Seifert ◽  
Wilhelm Pfleging
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Thick Film ◽  
Power Density ◽  
Discharge Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Ultrafast Laser ◽  
High Mass ◽  
Simultaneous Increase

Lithium-ion batteries have become the most promising energy storage devices in recent years. However, the simultaneous increase of energy density and power density is still a huge challenge. Ultrafast laser structuring of electrodes is feasible to increase power density of lithium-ion batteries by improving the lithium-ion diffusion kinetics. The influences of laser processing pattern and film thickness on the rate capability and energy density were investigated using Li(Ni0.6Mn0.2Co0.2)O2 (NMC 622) as cathode material. NMC 622 electrodes with thicknesses from 91 µm to 250 µm were prepared, while line patterns with pitch distances varying from 200 µm to 600 µm were applied. The NMC 622 cathodes were assembled opposing lithium using coin cell design. Cells with structured, 91 µm thick film cathodes showed lesser capacity losses with C-rates 3C compared to cells with unstructured cathode. Cells with 250 µm thick film cathode showed higher discharge capacity with low C-rates of up to C/5, and the structured cathodes showed higher discharge capacity, with C-rates of up to 1C. However, the discharge capacity deteriorated with higher C-rate. An appropriate choice of laser generated patterns and electrode thickness depends on the requested battery application scenario; i.e., charge/discharge rate and specific/volumetric energy density.

Tris(trimethylsilyl) phosphite (TMSPi) as an electrolyte additive for LiNi0.5Co0.2Mn0.3O2 cathode materials at elevated voltage and temperature

2021 ◽  
Author(s):  
Xiao Yu ◽  
Zhiyong Yu ◽  
Jishen Hao ◽  
Hanxing Liu
Keyword(s):  
Discharge Capacity ◽  
Cathode Materials ◽  
Solid Electrolyte Interphase ◽  
Rate Capability ◽  
Electrochemical Performances ◽  
Initial Discharge Capacity ◽  
Capacity Retention ◽  
Electrolyte Additive ◽  
Interface Impedance ◽  
Initial Discharge

Electrolyte additive tris(trimethylsilyl) phosphite (TMSPi) was used to promote the electrochemical performances of LiNi[Formula: see text]Co[Formula: see text]Mn[Formula: see text]O2 (NCM523) at elevated voltage (4.5 V) and temperature (55[Formula: see text]C). The NCM523 in 2.0 wt.% TMSPi-added electrolyte exhibited a much higher capacity (166.8 mAh/g) than that in the baseline electrolyte (118.3 mAh/g) after 100 cycles under 4.5 V at 30[Formula: see text]C. Simultaneously, the NCM523 with 2.0 wt.% TMSPi showed superior rate capability compared to that without TMSPi. Besides, after 100 cycles at 55[Formula: see text]C under 4.5 V, the discharge capacity retention reached 87.4% for the cell with 2.0 wt.% TMSPi, however, only 24.4% of initial discharge capacity was left for the cell with the baseline electrolyte. A series of analyses (TEM, XPS and EIS) confirmed that TMSPi-derived solid electrolyte interphase (SEI) stabilized the electrode/electrolyte interface and hindered the increase of interface impedance, resulting in obviously enhanced electrochemical performances of NCM523 cathode materials under elevated voltage and/or temperature.

scholarly journals The electrochemical performance of fluorinated ketjenblack as a cathode for lithium/fluorinated carbon batteries

RSC Advances ◽  
2021 ◽  
Vol 11 (41) ◽  
pp. 25461-25470
Author(s):  
Shengbo Jiang ◽  
Ping Huang ◽  
Jiachun Lu ◽  
Zhichao Liu
Keyword(s):  
Energy Density ◽  
Electrochemical Performance ◽  
Power Density ◽  
Rate Capability ◽  
High Rate ◽  
High Rate Capability ◽  
Fluorinated Carbon

Fluorinated kejtenblack as the cathode of Li/CFx batteries exhibits excellent energy density and power density with high rate capability.

An adaptive and stable bio-electrolyte for rechargeable Zn-ion batteries

2018 ◽  
Vol 6 (26) ◽  
pp. 12237-12243 ◽  
Author(s):  
Silan Zhang ◽  
Nengsheng Yu ◽  
Sha Zeng ◽  
Susheng Zhou ◽  
Minghai Chen ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Rate Capability ◽  
Density Rate

An adaptive and stable gum bio-electrolyte was developed, which enabled Zn-ion batteries that have very competitive performances in terms of capacity, energy density, power density, rate capability and cyclability.

Excellent rate capability and cycling stability in Li+-conductive Li2SnO3-coated LiNi0.5Mn1.5O4 cathode materials for lithium-ion batteries

2018 ◽  
Vol 47 (20) ◽  
pp. 7020-7028 ◽  
Author(s):  
Jirong Mou ◽  
Yunlong Deng ◽  
Zhicui Song ◽  
Qiaoji Zheng ◽  
Kwok Ho Lam ◽  
...  
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Power Density ◽  
High Voltage ◽  
Cathode Materials ◽  
Active Material ◽  
Rate Capability ◽  
Lithium Ion ◽  
Side Reactions ◽  
Capacity Fading

High-voltage LiNi0.5Mn1.5O4 is a promising cathode candidate for lithium-ion batteries (LIBs) due to its considerable energy density and power density, but the material generally undergoes serious capacity fading caused by side reactions between the active material and organic electrolyte.

Nanoporous Carbon Sponge as the Anode Materials for Lithium Ion Batteries

2012 ◽  
Vol 15 (4) ◽  
pp. 233-236
Author(s):  
Lianna Dang ◽  
Qina Sa ◽  
Zhangfeng Zheng ◽  
Yan Wang ◽  
Shenqiang Ren
Keyword(s):  
Energy Density ◽  
Lithium Ion Batteries ◽  
Power Density ◽  
Anode Materials ◽  
Rate Capability ◽  
Lithium Ion ◽  
High Energy ◽  
Nanoporous Carbon ◽  
High Energy Density ◽  
Long Cycle Life

Lithium ion battery is the choice for future generations of portable electronics and hybrid and electric vehicles due to its high energy density, power density and long cycle life compared to other battery technologies. However, current graphite anode limits its application due to the low energy density derived from layered graphitic structure and low rate capability due to the slow diffusion of Li ion in graphite. In this study, a simple and versatile approach was developed to generate nanoporous carbon sponge using the combination of hard templating and etching reaction. The electrochemical properties have been tested with these novel anode materials, which showed remarkable electrochemical performance and cycling stability. Therefore, the nanoporous carbon sponge is promising to be used as the anode materials for next generation lithium ion batteries requiring high energy density and power density.

scholarly journals Fabrication of Eco-Friendly Solid-State Symmetric Ultracapacitor Device Based on Co-Doped PANI/GO Composite

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1315 ◽  
Author(s):  
Gul ◽  
Shah ◽  
Bilal
Keyword(s):  
Solid State ◽  
Energy Density ◽  
Specific Capacitance ◽  
Power Density ◽  
Current Density ◽  
Sulfonic Acid ◽  
Rate Capability ◽  
Transfer Resistance ◽  
Benzene Sulfonic Acid ◽  
Co Doped

An eco-friendly solid-state symmetric ultracapacitor (Uc) device was fabricated using a polyaniline graphene oxide composite co-doped with sulfuric acid (H2SO4) and dodecyl benzene sulfonic acid (DBSA) or camphor sulfonic acid (CSA), as electrode material utilizing gold sheets as current collectors. The device showed specific capacitance value of 150 F/g at 1 A/g current density, with a capacitance retention value of 93.33% at higher current density (10 A/g), indicating a high rate capability. An energy density of 15.30 Whkg−1 with a power density of 1716 Wkg−1 was obtained at the current density of 1 A/g. The values of areal capacitance, power density, and energy density, achieved at the current density of 5 mAcm−2, were 97.38 mFcm−2, 9.93 mWhcm−2, and 1.1 Wcm−2, respectively. Additionally, the device showed very low solution and charge transfer resistance (0.885 Ω and 0.475 Ω, respectively). A device was also fabricated utilizing copper as current collector; however, a lower value of specific capacitance (82 F/g) was observed in this case.

scholarly journals Pseudocapacitive materials for electrochemical capacitors: from rational synthesis to capacitance optimization

2016 ◽  
Vol 4 (1) ◽  
pp. 71-90 ◽  
Author(s):  
Jie Wang ◽  
Shengyang Dong ◽  
Bing Ding ◽  
Ya Wang ◽  
Xiaodong Hao ◽  
...  
Keyword(s):  
Energy Density ◽  
Power Density ◽  
Rational Design ◽  
Electrode Materials ◽  
Electrochemical Capacitors ◽  
Rate Capability ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Devices ◽  
Storage Devices

Abstract Among various energy-storage devices, electrochemical capacitors (ECs) are prominent power provision but show relatively low energy density. One way to increase the energy density of ECs is to move from carbon-based electric double-layer capacitors to pseudocapacitors, which manifest much higher capacitance. However, compared with carbon materials, the pseudocapacitive electrodes suffer from high resistance for electron and/or ion transfer, significantly restricting their capacity, rate capability and cyclability. Rational design of electrode materials offers opportunities to optimize their electrochemical performance, leading to devices with high energy density while maintaining high power density. This paper reviews the different approaches of electrodes striving to advance the energy and power density of ECs.

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