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solid electrolyte interface

Qinglin Deng, Yanpeng Fu, Changbao Zhu, Yan Yu
Niobium-based oxides including Nb2 O5 , TiNbx O2+2.5x compounds, M-Nb-O (M = Cr, Ga, Fe, Zr, Mg, etc.) family, etc., as the unique structural merit (e.g., quasi-2D network for Li-ion incorporation, open and stable Wadsley- Roth shear crystal structure), are of great interest for applications in energy storage systems such as Li/Na-ion batteries and hybrid supercapacitors. Most of these Nb-based oxides show high operating voltage (>1.0 V vs Li+ /Li) that can suppress the formation of solid electrolyte interface film and lithium dendrites, ensuring the safety of working batteries...
February 14, 2019: Small
Sou Yasuhara, Shintaro Yasui, Takashi Teranishi, Keisuke Chajima, Yumi Yoshikawa, Yutaka Majima, Tomoyasu Taniyama, Mitsuru Itoh
Nanodot BaTiO3 supported LiCoO2 cathode thin films can dramatically improve high-rate chargeability and cyclability. The prepared BaTiO3 nanodot is less than 3 nm in height and 35 nm in diameter, and its coverage is less than 5%. Supported by high dielectric constant materials on the surface of cathode materials, Li ion can intercalate through robust Li paths around the triple phase interface consisting of the dielectric, cathode, and electrolyte. The current concentration around the triple phase interface is observed by the finite element method, and is in good agreement with the experimental data...
February 13, 2019: Nano Letters
Shammi Akter Ferdousi, Matthias Hilder, Andrew Basile, Haijin Zhu, Luke A O'Dell, Damien Saurel, Teofilo Rojo, Michel Armand, Maria Forsyth, Patrick Howlett
The effect of water on the properties of super concentrated sodium salt solutions in ionic liquids (ILs) was investigated in order to design electrolytes for sodium battery applications using water as an additive. Water were added to a 50 mol% solution of NaFSI in the ionic liquid N-methyl-N-propylpyrrolidinium bis(fluorosulfonyl)imide (C3mpyrFSI). While the thermal properties (glass transition temperature) showed little dependence on the water content, the viscosity and, in particular the ionic conductivity, are strongly affected...
February 10, 2019: ChemSusChem
Man Huang, Baojuan Xi, Zhenyu Feng, Fangfang Wu, Denghu Wei, Jing Liu, Jinkui Feng, Yitai Qian, Shenglin Xiong
The significant issues with alkali metal batteries arise from their poor electrochemical properties and safety problems, limiting their applications. Herein, TiO2 nanoparticles embedded into N-doped porous carbon truncated ocatahedra (TiO2 ⊂NPCTO) are engineered as a cathode material with different metal anodes, including solid Na or K and liquid Na-K alloy. Electrochemical performance and kinetics are systematically analyzed, with the aim to determine detailed electrochemistry. By using a galvanostatic intermittent titration technique, TiO2 ⊂NPCTO/NaK shows faster diffusion of metal ions in insertion and extraction processes than that of Na-ions and K-ions in solid Na and K...
February 10, 2019: Small
Manuel Weiss, Beatrix-Kamelia Seidlhofer, Matthias Geiß, Clemens Geis, Martin R Busche, Maximilian Becker, Nella M Vargas-Barbosa, Luca Silvi, Wolfgang G Zeier, Daniel Schröder, Jürgen Janek
Most commercial lithium-ion batteries and other types of batteries rely on liquid electrolytes, which are preferred due to their high ionic conductivity and facilitate fast charge-transfer kinetics at the electrodes. On the other hand, hybrid battery concepts that combine solid and liquid electrolytes might be needed to suppress unwanted shuttle effects in liquid electrolyte-only systems, in particular if mobile redox systems are involved in the cell chemistry. However, at the then newly introduced interface between liquid and solid electrolyte, a solid-liquid electrolyte interphase forms...
February 8, 2019: ACS Applied Materials & Interfaces
Jinqiang Zhang, Bing Sun, Yufei Zhao, Anastasia Tkacheva, Zhenjie Liu, Kang Yan, Xin Guo, Andrew M McDonagh, Devaraj Shanmukaraj, Chengyin Wang, Teofilo Rojo, Michel Armand, Zhangquan Peng, Guoxiu Wang
Due to the high theoretical specific energy, the lithium-oxygen battery has been heralded as a promising energy storage system for applications such as electric vehicles. However, its large over-potentials during discharge-charge cycling lead to the formation of side-products, and short cycle life. Herein, we report an ionic liquid bearing the redox active 2,2,6,6-tetramethyl-1-piperidinyloxy moiety, which serves multiple functions as redox mediator, oxygen shuttle, lithium anode protector, as well as electrolyte solvent...
February 5, 2019: Nature Communications
Marko M Melander, Mikael J Kuisma, Thorbjørn Erik Køppen Christensen, Karoliina Honkala
Properties of solid-liquid interfaces are of immense importance for electrocatalytic and electrochemical systems, but modeling such interfaces at the atomic level presents a serious challenge and approaches beyond standard methodologies are needed. An atomistic computational scheme needs to treat at least part of the system quantum mechanically to describe adsorption and reactions, while the entire system is in thermal equilibrium. The experimentally relevant macroscopic control variables are temperature, electrode potential, and the choice of the solvent and ions, and these need to be explicitly included in the computational model as well; this calls for a thermodynamic ensemble with fixed ion and electrode potentials...
January 28, 2019: Journal of Chemical Physics
Thomas Sayer, Michiel Sprik, Chao Zhang
Tasker type III polar terminations of ionic crystals carry a net surface charge as well as a dipole moment and are fundamentally unstable. In contact with electrolytes, such polar surfaces can be stabilized by adsorption of counterions from the solution to form electric double layers. In a previous work [T. Sayer et al., J. Chem. Phys 147, 104702 (2017)], we reported on a classical force field based molecular dynamics study of a prototype model system, namely, a NaCl(111) slab interfaced with an aqueous NaCl solution on both sides...
January 28, 2019: Journal of Chemical Physics
Dejun Ma, Qiulan Zhu, Xintao Li, Hongcheng Gao, Xiufang Wang, Xiongwu Kang, Yong Tian
The recognition of solid electrolyte interface (SEI) between the electrode materials and electrolyte is limiting the selection of electrode materials, electrolytes and further the electrochemical performance of batteries. Herein, we report ZnSe@C core-shell nanocomposites derived from ZIF-8 as anode materials of lithium ion batteries (LIBs), the electrochemical performances and SEI films formed on ZnSe@C in both ether and carbonate electrolytes. It is found that ZnSe@C delivers a reversible capacity of 617...
January 31, 2019: ACS Applied Materials & Interfaces
Hui Duan, Min Fan, Wan-Ping Chen, Jin-Yi Li, Peng-Fei Wang, Wen-Peng Wang, Ji-Lei Shi, Ya-Xia Yin, Li-Jun Wan, Yu-Guo Guo
In response to the call for safer high-energy-density storage systems, high-voltage solid-state Li metal batteries have attracted extensive attention. Therefore, solid electrolytes are required to be stable against both Li anode and high-voltage cathodes; nevertheless, the requirements still cannot be completely satisfied. Herein, a heterogeneous multilayered solid electrolyte (HMSE) is proposed to broaden electrochemical window of solid electrolytes to 0-5 V, through different electrode/electrolyte interfaces to overcome the interfacial instability problems...
January 31, 2019: Advanced Materials
Xueying Zheng, Haoyu Fu, Chenchen Hu, Hui Xu, Ying Huang, Jiayun Wen, Huabin Sun, Wei Luo, Yunhui Huang
Development of the next generation high-energy-density, low-cost batteries will likely be fueled by sodium (Na) metal batteries due to their high capacity and earth-abundancy. However, their practical application is significantly plagued by the hyper-reactivity of Na metal, unstable solid electrolyte interphase (SEI) and dendritic Na growth, leading to continuous electrolyte decomposition, low Coulombic efficiency (CE), large impedance and safety concerns. Herein, we add a small amount of SnCl2 additive in a common carbonate electrolyte so that the spontaneous reaction between SnCl2 and Na metal enables in-situ formation of a Na-Sn alloy layer and a compact NaCl-rich SEI...
January 29, 2019: Journal of Physical Chemistry Letters
Huicong Yang, Hucheng Li, Juan Li, Zhenhua Sun, Kuang He, Hui-Ming Cheng, Feng Li
Aluminum battery systems are considered as one of the supplementaries for current lithium batteries due to the low cost and high volumetric capacity of aluminum metal, and the high safety of the whole battery system. Fox example, the use of ionic liquid electrolytes leading AlCl4- existing instead of Al3+, the different intercalation reagents, the sluggish solid diffusion process and the cycling failure mode in aluminum batteries all need to be thoroughly explored. In order to provide a good understanding of the opportunities and challenges of the newly-emerging aluminum batteries, this review discusses the reaction mechanisms and the difficulties caused by the trivalent reaction medium in electrolytes, electrodes and electrode-electrolyte interfaces...
January 27, 2019: Angewandte Chemie
Xue Zhang, Shuo Wang, Chuanjiao Xue, Chengzhou Xin, Yuanhua Lin, Yang Shen, Liangliang Li, Ce-Wen Nan
Polymer-based electrolytes have attracted ever-increasing attention for all-solid-state lithium (Li) metal batteries due to their ionic conductivity, flexibility, and easy assembling into batteries, and are expected to overcome safety issues by replacing flammable liquid electrolytes. However, it is still a critical challenge to effectively block Li dendrite growth and improve the long-term cycling stability of all-solid-state batteries with polymer electrolytes. Here, the interface between novel poly(vinylidene difluoride) (PVDF)-based solid electrolytes and the Li anode is explored via systematical experiments in combination with first-principles calculations, and it is found that an in situ formed nanoscale interface layer with a stable and uniform mosaic structure can suppress Li dendrite growth...
January 25, 2019: Advanced Materials
Yoshikazu Yahata, Keiji Kimura, Yohei Nakanishi, Shoko Marukane, Takaya Sato, Yoshinobu Tsujii, Kohji Ohno
Immiscible composite materials with controlled phase-separated structures are important in area ranging from catalysis to battery. We succeeded in controlling the phase-separated structures of immiscible blends of polystyrene (PS) and two ionic-liquids (ILs), namely, N, N-diethyl- N-(2-methoxyethyl)- N-methylammonium bis(trifluoromethylsulfonyl)imide (DEME-TFSI) and 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TFSI), by adding precisely designed concentrated-polymer-brush-grafted (CPB-grafted) silica nanoparticles (CPB-SiPs) prepared by surface-initiated atom-transfer radical polymerization...
January 24, 2019: Langmuir: the ACS Journal of Surfaces and Colloids
Yuanyuan Zhao, Yusheng Ye, Feng Wu, Yuejiao Li, Li Li, Renjie Chen
Lithium-sulfur (Li-S) batteries are considered as one of the most promising options to realize rechargeable batteries with high energy capacity. Previously, research has mainly focused on solving the polysulfides' shuttle, cathode volume changes, and sulfur conductivity problems. However, the instability of anodes in Li-S batteries has become a bottleneck to achieving high performance. Herein, the main efforts to develop highly stable anodes for Li-S batteries, mainly including lithium metal anodes, carbon-based anodes, and alloy-based anodes, are considered...
January 22, 2019: Advanced Materials
Xiaojuan Dong, Jianbing Meng, Haian Zhou, Rufeng Xu, Xue Bai, Haiyun Zhang
Anti-adhesive Ni coatings with low wettability were successfully fabricated on Ti6Al4V substrates via an electro-brush plating method, and subsequently modified with a fluoroalkylsilane (FAS) film. The surface morphology, chemical compositions, and wettability of the as-prepared coatings were measured using scanning electron microscopy (SEM), X-ray diffractometer (XRD), Fourier transform infrared spectrophotometry (FTIR), and contact angle measurements. The results showed that the surface of Ti6Al4V substrate was endowed with flower-like structures...
January 18, 2019: Micromachines
Jian Duan, Wangyan Wu, Adelaide M Nolan, Tengrui Wang, Jiayun Wen, Chenchen Hu, Yifei Mo, Wei Luo, Yunhui Huang
All-solid-state batteries (ASSBs) with ceramic-based solid-state electrolytes (SSEs) enable high safety that is inaccessible with conventional lithium-ion batteries. Lithium metal, the ultimate anode with the highest specific capacity, also becomes available with nonflammable SSEs in ASSBs, which offers promising energy density. The rapid development of ASSBs, however, is significantly hampered by the large interfacial resistance as a matched lithium/ceramic interface that is not easy to pursue. Here, a lithium-graphite (Li-C) composite anode is fabricated, which shows a dramatic modification in wettability with garnet SSE...
January 21, 2019: Advanced Materials
Bin Sun, Jialiang Lang, Kai Liu, Naveed Hussain, Minghao Fang, Hui Wu
Lithium dendrite growth remains one of the major hindrances for its practical application. Here, we develop an ultrathin indium sheet to construct a stabilized lithium-rich hybrid anode with fast interfacial ion transport. The artificial alloy layer demonstrates an enhanced ionic conductivity that is an order of magnitude higher than that of the pristine solid electrolyte interphase. With the reduced diffusion barrier and improved charge transfer at the artificial interface, the hybrid anode realizes uniform lithium electrodeposition and considerable dendrite suppression...
January 18, 2019: Chemical Communications: Chem Comm
Yutao Dong, Yuhang Ma, Dan Li, Yushan Liu, Weihua Chen, Xiangming Feng, Jianmin Zhang
Rechargeable lithium-ion batteries (LIBs) have been the dominating technology for electric vehicles (EV) and grid storage in the current era, but they are still extensively demanded to further improve energy density, power density, and cycle life. Herein, a novel 3D layered nanoarchitecture network of Ni(HCO3 )2 /rGO composites with highly uniform Ni(HCO3 )2 nanocubes (average diameter of 100 ± 20 nm) wrapped in rGO films is facilely fabricated by a one-step hydrothermal self-assembly process based on the electrostatic interaction and coordination principle...
December 14, 2018: Chemical Science
Tianyi Ma, Hanying Xu, Xiangnan Yu, Huiyu Li, Wenguang Zhang, Xiaolu Cheng, Wentao Zhu, Xinping Qiu
A design of coaxial hollow nano-cables of carbon nanotubes and silicon composite (CNTs@Silicon) was presented, and the lithiation/delithiation behavior was investigated. The FIB-SEM studies demonstrated hollow structured silicon tend to expansion inward and shrink outward during lithiation/delithiation, which reveal the mechanism of inhibitive effect of the excessive growth of solid electrolyte interface (SEI) by hollow structured silicon. The as-prepared coaxial hollow nano-cables demonstrates an impressive reversible specific capacity of 1150 mAh g-1 over 500 cycles, giving an average Coulombic efficiency of >99...
January 16, 2019: ACS Nano
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