Improved Cycling Performance of P2-Na0.67Ni0.33Mn0.67O2 Based on Sn Substitution Combined with Polypyrrole Coating

Measures to improve the cycling performance and stability of bulk-type all-solid-state batteries (SSBs) are currently being developed with the goal of substituting conventional Li-ion battery (LIB) technology. As known from liquid electrolyte based LIBs, layered oxide cathode materials undergo volume changes upon (de)lithiation, causing mechanical degradation due to particle fracture, among others. Unlike solid electrolytes, liquid electrolytes are somewhat capable of accommodating morphological changes. In SSBs, the rigidity of the materials used typically leads to adverse contact loss at the interfaces of cathode material and solid electrolyte during cycling. Hence, designing zero- or low-strain electrode materials for application in next-generation SSBs is desirable. In the present work, we report on novel Co-rich NCMs, NCM361 (60% Co) and NCM271 (70% Co), showing minor volume changes up to 4.5 V vs Li+/Li, as determined by operando X-ray diffraction and pressure measurements of LIB pouch and pelletized SSB cells, respectively. Both cathode materials exhibit good cycling performance when incorporated into SSB cells using argyrodite Li6PS5Cl solid electrolyte, albeit their morphology and secondary particle size have not yet been optimized.

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Rational Design of Quasi Zero-Strain NCM Cathode Materials for Minimizing Volume Change Effects in All-Solid-State Batteries

10.26434/chemrxiv.10000751 ◽

2019 ◽

Author(s):

Florian Strauss ◽

Lea de Biasi ◽

A-Young Kim ◽

Jonas Hertle ◽

Simon Schweidler ◽

...

Keyword(s):

Solid State ◽

Solid Electrolyte ◽

Cathode Materials ◽

Rational Design ◽

Electrode Materials ◽

Cycling Performance ◽

Mechanical Degradation ◽

Volume Changes ◽

Solid State Batteries ◽

All Solid State Batteries

Measures to improve the cycling performance and stability of bulk-type all-solid-state batteries (SSBs) are currently being developed with the goal of substituting conventional Li-ion battery (LIB) technology. As known from liquid electrolyte based LIBs, layered oxide cathode materials undergo volume changes upon (de)lithiation, causing mechanical degradation due to particle fracture, among others. Unlike solid electrolytes, liquid electrolytes are somewhat capable of accommodating morphological changes. In SSBs, the rigidity of the materials used typically leads to adverse contact loss at the interfaces of cathode material and solid electrolyte during cycling. Hence, designing zero- or low-strain electrode materials for application in next-generation SSBs is desirable. In the present work, we report on novel Co-rich NCMs, NCM361 (60% Co) and NCM271 (70% Co), showing minor volume changes up to 4.5 V vs Li+/Li, as determined by operando X-ray diffraction and pressure measurements of LIB pouch and pelletized SSB cells, respectively. Both cathode materials exhibit good cycling performance when incorporated into SSB cells using argyrodite Li6PS5Cl solid electrolyte, albeit their morphology and secondary particle size have not yet been optimized.

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Potassium Pre-Inserted K1.04Mn8O16 Cathode Materials for Aqueous Li-Ion and Na-Ion Hybrid Capacitors

10.26434/chemrxiv.9791477.v1 ◽

2019 ◽

Author(s):

Yamin Zhang ◽

Lina Chen ◽

Chongyang Hao ◽

Xiaowen Zheng ◽

Yixuan Guo ◽

...

Keyword(s):

Cycling Performance ◽

High Energy ◽

High Energy Density ◽

Potassium Ions ◽

Tunnel Structure ◽

Hybrid Supercapacitor ◽

Hybrid Supercapacitors ◽

Li Ion ◽

Power Densities ◽

Hybrid Capacitors

For the applications of aqueous Li-ion hybrid capacitors and Na-ion hybrid capacitors, potassium ions are pre-inserted into MnO2 tunnel structure, the as-prepared K1.04Mn8O16 materials consist of <a>nanoparticles</a> and nanorods were prepared by facile high-temperature solid-state reaction. <a></a>The as-prepared materials were well studied andthey show outstanding electrochemical behavior. We assembled hybrid supercapacitors with commercial activated carbon (YEC-8A) as anode and K1.04Mn8O16 as cathode. It has high energy densities and power densities. Li-ion capacitors reach a high energy density of 127.61 Wh kg-1 at the power density of 99.86 W kg-1 and Na-ion capacitor obtains 170.96 Wh kg-1 at 133.79 W kg-1. In addition, the <a>hybrid supercapacitor</a>s demonstrate excellent cycling performance which maintain 97 % capacitance retention for Li-ion capacitor and 85 % for Na-ion capacitor after 10,000 cycles.

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Highly thermally conductive graphene-based electrodes for supercapacitors with excellent heat dissipation ability

Sustainable Energy & Fuels ◽

10.1039/c7se00399d ◽

2017 ◽

Vol 1 (10) ◽

pp. 2145-2154 ◽

Cited By ~ 7

Author(s):

Bo Zhao ◽

Xian-Zhu Fu ◽

Rong Sun ◽

Ching-Ping Wong

Keyword(s):

Heat Dissipation ◽

Cycling Performance ◽

Thermally Conductive ◽

Rate Capacity ◽

Electrodes For Supercapacitors

The highly thermally conductive graphene-based electrodes for supercapacitors exhibit great heat dissipation ability as well as excellent cycling performance and rate capacity.

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The effects of Sn substitution on the phase, microstructure, and dielectric properties of 0.94(Bi0.5Na0.5)TiO3–0.06Ba(Zr0.1Ti0.9)O3 ceramic system

Chemical Physics Impact ◽

10.1016/j.chphi.2021.100015 ◽

2021 ◽

Vol 2 ◽

pp. 100015

Author(s):

Abdul Manan ◽

Murad Ali Khan ◽

Arbab Safeer Ahmad ◽

Atta Ullah ◽

Arshad Hussain wazir ◽

...

Keyword(s):

Dielectric Properties ◽

Ceramic System ◽

Sn Substitution

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Impact of Sn substitution on the structure and magnetism of Sr2IrO4

Physical Review Materials ◽

10.1103/physrevmaterials.2.094406 ◽

2018 ◽

Vol 2 (9) ◽

Cited By ~ 2

Author(s):

Andrew F. May ◽

Huibo Cao ◽

Stuart Calder

Keyword(s):

Sn Substitution

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Lifetime of electrochromic optical transition cycling of ethyl viologen diperchlorate-based electrochromic devices

SN Applied Sciences ◽

10.1007/s42452-021-04552-1 ◽

2021 ◽

Vol 3 (5) ◽

Author(s):

Logan G. Kiefer ◽

Christian J. Robert ◽

Taylor D. Sparks

Keyword(s):

Optical Transition ◽

Low Cost ◽

Cycling Performance ◽

Power Measurement ◽

Electrochromic Devices ◽

Metal Oxide Films ◽

Cycle Times ◽

Vis Spectroscopy ◽

Multiple Devices ◽

Measurement Devices

AbstractElectrochromic materials and devices are enabling a variety of advanced technologies. Gel-based organic electrochromic molecules such as ethyl viologen diperchlorate are attractive options due to their simple device design and low cost processing options relative to the more expensive and complex transition metal oxide films. However, electrochromic devices are subject to extensive cycling in which failure and fatigue can eventually occur. This work presents the lifetime cycling performance of ethyl viologen diperchlorate-based electrochromic devices using two different anodic compounds, hydroquinone and ferrocene, which are cycled at different voltages, 3 V and 1.2 V, respectively. Multiple devices are cycled until failure with periodic device characterization via UV–Vis spectroscopy, electrical resistance and power measurement, and transition duration measurement. Devices with hydroquinone can transition quickly. Cycle times are $$\sim$$ ∼ 30 s in these samples, however, these samples also typically fail before 3000 cycles. On the other hand, devices using ferrocene transition more slowly (total cycle time $$\sim$$ ∼ 2 min), but have superior cycling performance with all samples surviving beyond 10,000 cycles while complying with ASTM E2141-14 standard.

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Stabilization of Li0.33La0.55TiO3 Solid Electrolyte Interphase Layer and Enhancement of Cycling Performance of LiNi0.5Co0.3Mn0.2O2 Battery Cathode with Buffer Layer

Nanomaterials ◽

10.3390/nano11040989 ◽

2021 ◽

Vol 11 (4) ◽

pp. 989

Author(s):

Feihu Tan ◽

Hua An ◽

Ning Li ◽

Jun Du ◽

Zhengchun Peng

Keyword(s):

Solid State ◽

Ionic Conductivity ◽

Solid Electrolyte ◽

Buffer Layer ◽

Solid Electrolyte Interphase ◽

Cycling Performance ◽

Physical Contact ◽

Initial State ◽

Amorphous Sio2 ◽

Current Output

All-solid-state batteries (ASSBs) are attractive for energy storage, mainly because introducing solid-state electrolytes significantly improves the battery performance in terms of safety, energy density, process compatibility, etc., compared with liquid electrolytes. However, the ionic conductivity of the solid-state electrolyte and the interface between the electrolyte and the electrode are two key factors that limit the performance of ASSBs. In this work, we investigated the structure of a Li0.33La0.55TiO3 (LLTO) thin-film solid electrolyte and the influence of different interfaces between LLTO electrolytes and electrodes on battery performance. The maximum ionic conductivity of the LLTO was 7.78 × 10−5 S/cm. Introducing a buffer layer could drastically improve the battery charging and discharging performance and cycle stability. Amorphous SiO2 allowed good physical contact with the electrode and the electrolyte, reduced the interface resistance, and improved the rate characteristics of the battery. The battery with the optimized interface could achieve 30C current output, and its capacity was 27.7% of the initial state after 1000 cycles. We achieved excellent performance and high stability by applying the dense amorphous SiO2 buffer layer, which indicates a promising strategy for the development of ASSBs.

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A Novel Highly Durable Carbon/Silver/Silver Chloride Composite Electrode for High-Definition Transcranial Direct Current Stimulation

Nanomaterials ◽

10.3390/nano11081962 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1962

Author(s):

Lingjun Li ◽

Guangli Li ◽

Yuliang Cao ◽

Yvonne Yanwen Duan

Keyword(s):

Service Life ◽

Direct Current ◽

Transcranial Direct Current Stimulation ◽

Silver Chloride ◽

Cycling Performance ◽

High Definition ◽

Silver Silver ◽

Sintered Ag ◽

Silver Silver Chloride

High-definition transcranial direct current stimulation (HD-tDCS) is a promising non-invasive neuromodulation technique, which has been widely used in the clinical intervention and treatment of neurological or psychiatric disorders. Sintered Ag/AgCl electrode has become a preferred candidate for HD-tDCS, but its service life is very short, especially for long-term anodal stimulation. To address this issue, a novel highly durable conductive carbon/silver/silver chloride composite (C/Ag/AgCl) electrode was fabricated by a facile cold rolling method. The important parameters were systematically optimized, including the conductive enhancer, the particle size of Ag powder, the C:Ag:PTFE ratio, the saline concentration, and the active substance loading. The CNT/Ag/AgCl-721 electrode demonstrated excellent specific capacity and cycling performance. Both constant current anodal polarization and simulated tDCS measurement demonstrated that the service life of the CNT/Ag/AgCl-721 electrodes was 15-16 times of that of sintered Ag/AgCl electrodes. The much longer service life can be attributed to the formation of the three-dimensional interpenetrating conductive network with CNT doping, which can maintain a good conductivity and cycling performance even if excessive non-conductive AgCl is accumulated on the surface during long-term anodal stimulation. Considering their low cost, long service life, and good skin tolerance, the proposed CNT/Ag/AgCl electrodes have shown promising application prospects in HD-tDCS, especially for daily life scenarios.

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