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Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 13
Author(s):  
Hua Wang ◽  
Tianyi Li ◽  
Ahmed M. Hashem ◽  
Ashraf E. Abdel-Ghany ◽  
Rasha S. El-Tawil ◽  
...  

This work aimed at synthesizing MoO3 and MoO2 by a facile and cost-effective method using extract of orange peel as a biological chelating and reducing agent for ammonium molybdate. Calcination of the precursor in air at 450 °C yielded the stochiometric MoO3 phase, while calcination in vacuum produced the reduced form MoO2 as evidenced by X-ray powder diffraction, Raman scattering spectroscopy, and X-ray photoelectron spectroscopy results. Scanning and transmission electron microscopy images showed different morphologies and sizes of MoOx particles. MoO3 formed platelet particles that were larger than those observed for MoO2. MoO3 showed stable thermal behavior until approximately 800 °C, whereas MoO2 showed weight gain at approximately 400 °C due to the fact of re-oxidation and oxygen uptake and, hence, conversion to stoichiometric MoO3. Electrochemically, traditional performance was observed for MoO3, which exhibited a high initial capacity with steady and continuous capacity fading upon cycling. On the contrary, MoO2 showed completely different electrochemical behavior with less initial capacity but an outstanding increase in capacity upon cycling, which reached 1600 mAh g−1 after 800 cycles. This outstanding electrochemical performance of MoO2 may be attributed to its higher surface area and better electrical conductivity as observed in surface area and impedance investigations.


Author(s):  
Linghong Zhang ◽  
Sookyung Jeong ◽  
Nathan Reinsma ◽  
Kerui Sun ◽  
Derrick S Maxwell ◽  
...  

Abstract Compared to the graphite anode, Si and SiOx-containing anodes usually have a larger initial capacity loss (ICL) due to more parasitic reactions. The higher ICL of the anode can cause significant Li inventory loss in a full cell, leading to a compromised energy density. As one way to mitigate such Li inventory loss, Li2O2 can be used as the cathode prelithiation additive to provide additional lithium. However, an additional catalyst is usually needed to lower its decomposition potential. In this work, we investigate the use of Li2O2 as the cathode prelithiation additive without the addition of a catalyst. Li2O2 decomposition is first demonstrated in coin half-cells with a calculated capacity of 1180 mAh/g obtained from Li2O2 decomposition. We then further demonstrate successful Li2O2 decomposition in single-layer pouch (SLP) full cells and evaluate the initial electrochemical performance. Despite its moisture sensitivity, Li2O2 showed reasonable compatibility with dry-room handling. After dry-room handling, Li2O2 decomposition was observed with an onset potential of 4.29 V vs. SiOx anode in SLP cells. With Li2O2 addition, the utilization of the Li inventory from cathode active material was improved by 12.9%, and discharge DCR has reduced by 7% while the cells still deliver similar cell capacities.


Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3223
Author(s):  
Chunliu Li ◽  
Banglei Zhao ◽  
Junfeng Yang ◽  
Linchao Zhang ◽  
Qianfeng Fang ◽  
...  

Li2ZrO3-coated and Al-doped micro-sized monocrystalline LiMn2O4 powder is synthesized through solid-state reaction, and the electrochemical performance is investigated as cathode materials for lithium-ion batteries. It is found that Li2ZrO3-coated LiAl0.06Mn1.94O4 delivers a discharge capacity of 110.90 mAhg−1 with 94% capacity retention after 200 cycles at room temperature and a discharge capacity of 104.4 mAhg−1 with a capacity retention of 87.8% after 100 cycles at 55 °C. Moreover, Li2ZrO3-coated LiAl0.06Mn1.94O4 could retain 87.5% of its initial capacity at 5C rate. This superior cycling and rate performance can be greatly contributed to the synergistic effect of Al-doping and Li2ZrO3-coating.


Author(s):  
Mengxi Zhao ◽  
Zhongpei Lu ◽  
Lin Chen ◽  
Xuefan Jiang ◽  
Fan Yin ◽  
...  

In this paper, a series of Li3V2(PO4)3/C composite nanofibers is prepared by a facile and environmentally friendly electrospinning method and calcined under different temperatures. The LVP nanofiber calcined under 900 ℃ exhibits the best electrochemical performance. The bicontinuous morphologies of LVP/CNF are the fibers shrunk and the LVP crystals simultaneously grown. At the range of 3.0–4.3 V, LVP/CNF obtained under 900 ℃ delivers the initial capacity of 135 mAh/g, close to the theoretical capacity of LVP. Even at high current density, the sample of LVP/CNF still presents good electrochemical performance.


2021 ◽  
pp. 139200
Author(s):  
Xiaole Zhang ◽  
Song Li ◽  
Shenghe Wang ◽  
Shichao Du ◽  
Zhongsheng Wen ◽  
...  

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Hyeokjin Kwon ◽  
Ju-Hyuk Lee ◽  
Youngil Roh ◽  
Jaewon Baek ◽  
Dong Jae Shin ◽  
...  

AbstractThe long-term cycling of anode-free Li-metal cells (i.e., cells where the negative electrode is in situ formed by electrodeposition on an electronically conductive matrix of lithium sourced from the positive electrode) using a liquid electrolyte is affected by the formation of an inhomogeneous solid electrolyte interphase (SEI) on the current collector and irregular Li deposition. To circumvent these issues, we report an atomically defective carbon current collector where multivacancy defects induce homogeneous SEI formation on the current collector and uniform Li nucleation and growth to obtain a dense Li morphology. Via simulations and experimental measurements and analyses, we demonstrate the beneficial effect of electron deficiency on the Li hosting behavior of the carbon current collector. Furthermore, we report the results of testing anode-free coin cells comprising a multivacancy defective carbon current collector, a LixNi0.8Co0.1Mn0.1-based cathode and a nonaqueous Li-containing electrolyte solution. These cells retain 90% of their initial capacity for over 50 cycles under lean electrolyte conditions.


2021 ◽  
pp. 2143001
Author(s):  
Lin Wang ◽  
Yichun Wang ◽  
Guoqiang Jiang ◽  
Jiangfeng Ni ◽  
Liang Li

Vanadium oxides, such as V6O[Formula: see text], have a high theoretical capacity for sodium storage, but their performance faces the challenges of low conductivity and poor cycling stability caused by side reactions. To solve these problems, we report on the material design of self-supported nanosheet arrays coated with poly(3, 4-ethylenedioxythiophene) (PEDOT). In this design, the nanosheet architecture facilitates the electron and ion transport to boost the charge storage, while the PEDOT coating prevents the direct contact between the electrode nanosheet and the electrolyte, thus inhibiting the occurrence of side reactions. This PEDOT-modified nanosheet electrode exhibits a reversible capacity of 179 mAh g[Formula: see text] in the potential range of 1.5–3.8 V, and retains 66% of the initial capacity at a rate of 1 C for 100 cycles.


Author(s):  
Zhixiang Rao ◽  
Jingyi Wu ◽  
Bin He ◽  
Weilun Chen ◽  
Hua Wang ◽  
...  

2021 ◽  
Vol MA2021-01 (5) ◽  
pp. 301-301
Author(s):  
Reed M Wittman ◽  
Matthieu Dubarry ◽  
Sergei Ivanov ◽  
Armando Fresquez ◽  
Jill Langendorf ◽  
...  
Keyword(s):  
Li Ion ◽  

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