scholarly journals Partially Fluorinated Ether as an Electrolyte Additive to Modify Electrode Surface and Suppress Dissolution of Polysulfides in Li-S Batteries

2018 ◽  
Vol 4 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Feng Qian ◽  
Jie Shao ◽  
Yu Chen ◽  
Guobin Zhu ◽  
Qunting Qu ◽  
...  
Keyword(s):  
Surface Layer ◽  
Electrode Surface ◽  
Reaction Kinetic ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Electrode Reaction ◽  
Modify Electrode ◽  
Electrolyte Additive ◽  
Fluorinated Ether ◽  
Initial Coulombic Efficiency

Abstract1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether (TTE), a kind of fluorinated ether, was used as an electrolyte additive for Li-S batteries. A compact, smooth, and homogenous surface layer was formed on lithium anode at the optimized amount of added TTE. In addition, TTE additive played a crucial role in modifying the composition of the passivation layer on the sulfur/carbon cathode. Consequently, the dissolution and shuttling of polysulfides were effectively prevented. The reversible capacity, initial coulombic efficiency, electrode reaction kinetic, and cycling stability of Li-S batteries were greatly improved.

Boron-doped porous Si anode materials with high initial coulombic efficiency and long cycling stability

2018 ◽  
Vol 6 (7) ◽  
pp. 3022-3027 ◽  
Author(s):  
Ming Chen ◽  
Bo Li ◽  
Xuejiao Liu ◽  
Ling Zhou ◽  
Lin Yao ◽  
...  
Keyword(s):  
Anode Materials ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Cycling Stability ◽  
Porous Si ◽  
Boron Doped ◽  
Si Anode ◽  
Initial Coulombic Efficiency

B-Doped pSi exhibits an exceptionally high initial coulombic efficiency of 89% and shows outstanding cycling performance (reversible capacity of 1500 mA h g−1 at 2 A g−1 after 300 cycles).

scholarly journals Dramatically enhanced reversibility of Li2O in SnO2-based electrodes: the effect of nanostructure on high initial reversible capacity

2016 ◽  
Vol 9 (2) ◽  
pp. 595-603 ◽  
Author(s):  
Renzong Hu ◽  
Dongchang Chen ◽  
Gordon Waller ◽  
Yunpeng Ouyang ◽  
Yu Chen ◽  
...  
Keyword(s):  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Initial Coulombic Efficiency

Suppressing the Sn coarsening in the Li2O matrix enabled highly reversible conversion between Li2O and SnO2 and an initial Coulombic efficiency of ∼95.5% was achieved.

Layered phosphorus-like GeP5: a promising anode candidate with high initial coulombic efficiency and large capacity for lithium ion batteries

2015 ◽  
Vol 8 (12) ◽  
pp. 3629-3636 ◽  
Author(s):  
Wenwu Li ◽  
Huiqiao Li ◽  
Zhijuan Lu ◽  
Lin Gan ◽  
Linbo Ke ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Large Capacity ◽  
Initial Coulombic Efficiency ◽  
Very High

Layer structured GeP5 is firstly developed as an anode material for LIB, it delivers a reversible capacity of 2300 mA h g−1 with a very high initial coulombic efficiency of 95%.

scholarly journals Structural characterization and electrochemical performance of macroporous graphite-like C3N3 prepared by the Wurtz reaction and heat treatment

RSC Advances ◽  
2017 ◽  
Vol 7 (69) ◽  
pp. 44001-44008 ◽  
Author(s):  
Hao Yin ◽  
Qixun Guo ◽  
Dingzeng He ◽  
Juntao Li ◽  
Shigang Sun
Keyword(s):  
Heat Treatment ◽  
Electrochemical Performance ◽  
Structural Characterization ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Initial Coulombic Efficiency ◽  
Wurtz Reaction

g-C3N3 is synthesized by a facile method and further heat treatment can improve the initial coulombic efficiency and reversible capacity.

scholarly journals Achieving over 90 % initial Coulombic efficiency and highly stable Li storage in SnO2 by constructing interfacial oxygen redistribution in multilayers

2021 ◽  
Author(s):  
Xuexia Lan ◽  
Jie Cui ◽  
Xiaofeng Zhang ◽  
Renzong Hu ◽  
Liang Tan ◽  
...  
Keyword(s):  
High Performance ◽  
Tin Dioxide ◽  
Theoretical Calculations ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Reversible Capacity ◽  
Cycling Stability ◽  
Ex Situ ◽  
Initial Coulombic Efficiency ◽  
Li Storage

Abstract Among the promising high capacity anode materials, tin dioxide (SnO2) represents a classic and important candidate that involves both conversion and alloying reactions toward Li storage. However, the inferior reversibility of conversion reactions usually results in low initial Coulombic efficiency (ICE, ~ 60%), small reversible capacity and poor cycling stability of electrodes. Here, we demonstrate that by carefully designing the interface structure of SnO2-Mo, a breakthrough comprehensive performance with ultrahigh average ICE up to 92.6 %, large capacity of 1067 mA h g-1 and 100 % capacity retention after 200 cycles can be realized in a multilayer Mo/SnO2/Mo electrode. The amorphous SnO2/Mo interfaces, which are induced by redistribution of oxygen atoms between SnO2 and Mo, can precisely adjust the reversible capacity and cycling stability of the multilayers, while the stable capacities of electrodes are parabolic with the interfacial density. Theoretical calculations and in/ex-situ experimental investigation clearly reveal that oxygen redistribution in the SnO2/Mo hetero-interfaces boosts the Li ions transport kinetics by inducing a built-in electric field and improves the reaction reversibility of SnO2. This work provides a new understanding of the interface-performance relationship of metal-oxide hybrid electrodes and pivotal guidance for creating high performance Li-ion batteries.

Nanosheet-based Nb12O29 hierarchical microspheres for enhanced lithium storage

2019 ◽  
Vol 55 (17) ◽  
pp. 2493-2496 ◽  
Author(s):  
Renjie Li ◽  
Xiangzhen Zhu ◽  
Qingfeng Fu ◽  
Guisheng Liang ◽  
Yongjun Chen ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Coulombic Efficiency ◽  
Rate Capability ◽  
Reversible Capacity ◽  
Lithium Storage ◽  
High Reversible Capacity ◽  
Hierarchical Microspheres ◽  
Operating Potential ◽  
Safe Operating ◽  
Initial Coulombic Efficiency

Conductive Nb12O29 hierarchical microspheres with nanosheet shells demonstrated comprehensively good electrochemical properties, including a significant pseudocapacitive contribution, safe operating potential, high reversible capacity, superior initial coulombic efficiency, increased rate capability, and durable cycling stability.

Ultrafast synthesis of hard carbon anodes for sodium-ion batteries

2021 ◽  
Vol 118 (42) ◽  
pp. e2111119118
Author(s):  
Yichao Zhen ◽  
Yang Chen ◽  
Feng Li ◽  
Zhenyu Guo ◽  
Zhensheng Hong ◽  
...  
Keyword(s):  
Metal Ion ◽  
Coulombic Efficiency ◽  
Reversible Capacity ◽  
Plasma Sintering ◽  
Lower Porosity ◽  
Spark Plasma ◽  
Dynamics Simulations ◽  
Carbon Anodes ◽  
Sintering Method ◽  
Initial Coulombic Efficiency

Hard carbons (HCs) are a significantly promising anode material for alkali metal-ion batteries. However, long calcination time and much energy consumption are required for the traditional fabrication way, resulting in an obstacle for high-throughput synthesis and structure regulation of HCs. Herein, we report an emerging sintering method to rapidly fabricate HCs from different carbon precursors at an ultrafast heating rate (300 to 500 °C min−1) under one minute by a multifield-regulated spark plasma sintering (SPS) technology. HCs prepared via the SPS possess significantly fewer defects, lower porosity, and less oxygen content than those pyrolyzed in traditional sintering ways. The molecular dynamics simulations are employed to elucidate the mechanism of the remarkably accelerated pyrolysis from the quickly increased carbon sp2 content under the multifield effect. As a proof of concept, the SPS-derived HC exhibits an improved initial Coulombic efficiency (88.9%), a larger reversible capacity (299.4 mAh⋅g−1), and remarkably enhanced rate capacities (136.6 mAh⋅g−1 at 5 A⋅g−1) than anode materials derived from a traditional route for Na-ion batteries.

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