scholarly journals Waterborne polyurethane as a carbon coating for micrometre-sized silicon-based lithium-ion battery anode material

2018 ◽  
Vol 5 (8) ◽  
pp. 180311 ◽  
Author(s):  
Chunfeng Yan ◽  
Tao Huang ◽  
Xiangzhen Zheng ◽  
Cuiran Gong ◽  
Maoxiang Wu
Keyword(s):  
Carbon Coating ◽  
Lithium Ion ◽  
Waterborne Polyurethane ◽  
Cycling Performance ◽  
Capacity Retention ◽  
Lithium Ions ◽  
Rate Capacity ◽  
Silicon Based ◽  
Carbon Network ◽  
A Current

Waterborne polyurethane (WPU) is first used as a carbon-coating source for micrometre-sized silicon. The remaining nitrogen (N) and oxygen (O) heteroatoms during pyrolysis of the WPU interact with the surface oxide on the silicon (Si) particles via hydrogen bonding (Si–OH⋯N and Si–OH⋯O). The N and O atoms involved in the carbon network can interact with the lithium ions, which is conducive to lithium-ion insertion. A satisfactory performance of the Si@N, O-doped carbon (Si@CNO) anode is gained at 25 and 55°C. The Si@CNO anode shows stable cycling performance (capacity retention of 70.0% over 100 cycles at 25°C and 60.3% over 90 cycles at 55°C with a current density of 500 mA g −1 ) and a superior rate capacity of 864.1 mA h g −1 at 1000 mA g −1 (25°C). The improved electrochemical performance of the Si@CNO electrode is attributed to the enhanced electrical conductivity and structural stability.

Structure and electrochemical properties of C-coated Li2O–V2O5–P2O5 glass-ceramic as cathode material for lithium-ion batteries

2019 ◽  
Vol 12 (05) ◽  
pp. 1951002 ◽  
Author(s):  
Jingwei Li ◽  
Shixi Zhao ◽  
Xia Wu ◽  
Lüqiang Yu ◽  
Enlai Zhao ◽  
...  
Keyword(s):  
Glass Ceramic ◽  
Cathode Materials ◽  
Carbon Coating ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Rate Performance ◽  
Capacity Retention ◽  
Ceramic Structure ◽  
Carbon Coated ◽  
Quenching Method

A series of glass cathode materials [Formula: see text]Li2O–50V2O5–(50−[Formula: see text])P2O5 ([Formula: see text], 25, 30, 35 and 40) have been synthesized by a simple melting–quenching method. 30Li2O–50V2O5–20P2O5 glass (LVP30) shows the best cycling performance with a preferable capacity retention after 50 cycles. Then, we prepared a series of carbon-coated LVP30 glass-ceramic cathode materials by carbon coating and heat treatment. The carbon-coated LVP30 samples consist of the crystalline phase V2O3, VO2 and Li2O–V2O5–P2O5 glass. Among the carbon-coated LVP30 samples, LVP30-15C sample exhibits the best cycling and rate performance. It can retain a discharge capacity of 140[Formula: see text]mAh[Formula: see text]g[Formula: see text] after 100 cycles. This unique glass-ceramic structure can result in good conductivity and structural ductility.

Hierarchical three-dimensional MnO nanorods/carbon anodes for ultralong-life lithium-ion batteries

2016 ◽  
Vol 4 (43) ◽  
pp. 16936-16945 ◽  
Author(s):  
Wei Zhang ◽  
Jinzhi Sheng ◽  
Jie Zhang ◽  
Ting He ◽  
Lin Hu ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Current Density ◽  
Three Dimensional ◽  
Size Variation ◽  
Lithium Ion ◽  
Capacity Retention ◽  
Carbon Anodes ◽  
Carbon Network ◽  
A Current

N-Doped carbon network encapsulated MnO nanorods demonstrate 95% capacity retention at a current density of 4000 mA g−1for 3000 cycles. In this case, almost no pulverization or size variation of the nanorods can be observed.

scholarly journals The influence of different Si : C ratios on the electrochemical performance of silicon/carbon layered film anodes for lithium-ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 6660-6666 ◽  
Author(s):  
Jun Wang ◽  
Shengli Li ◽  
Yi Zhao ◽  
Juan Shi ◽  
Lili Lv ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Lithium Ions ◽  
High Specific Capacity ◽  
Silicon Carbon ◽  
Silicon Based

With a high specific capacity (4200 mA h g−1), silicon based materials have become the most promising anode materials in lithium-ions batteries.

scholarly journals Improved lithium-ion battery anode capacity with a network of easily fabricated spindle-like carbon nanofibers

2016 ◽  
Vol 7 ◽  
pp. 1289-1295 ◽  
Author(s):  
Mengting Liu ◽  
Wenhe Xie ◽  
Lili Gu ◽  
Tianfeng Qin ◽  
Xiaoyi Hou ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Coulombic Efficiency ◽  
High Capacity ◽  
Lithium Ion ◽  
Carbon Matrix ◽  
Reversible Capacity ◽  
Excellent Electrochemical Performance ◽  
Rate Capacity ◽  
Binder Free ◽  
Carbon Network

A novel network of spindle-like carbon nanofibers was fabricated via a simplified synthesis involving electrospinning followed by preoxidation in air and postcarbonization in Ar. Not only was the as-obtained carbon network comprised of beads of spindle-like nanofibers but the cubic MnO phase and N elements were successfully anchored into the amorphous carbon matrix. When directly used as a binder-free anode for lithium-ion batteries, the network showed excellent electrochemical performance with high capacity, good rate capacity and reliable cycling stability. Under a current density of 0.2 A g−1, it delivered a high reversible capacity of 875.5 mAh g−1 after 200 cycles and 1005.5 mAh g−1 after 250 cycles with a significant coulombic efficiency of 99.5%.

scholarly journals Synthesis of Nanocobalt Powders for an Anode Material of Lithium-Ion Batteries by Chemical Reduction and Carbon Coating

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Seong-Hyeon Hong ◽  
Yeong-Mi Jin ◽  
Kyung Tae Kim ◽  
Cheol-Woo Ahn ◽  
Dong-Su Park ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Anode Material ◽  
Carbon Coating ◽  
Reduction Method ◽  
Chemical Reduction ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Chemical Reduction Method ◽  
The Third ◽  
Carbon Coated

Nanosized Co powders were prepared by a chemical reduction method with and without CTAB (cetyltrimethylammonium bromide,C19H42BrN) and carbon-coating heat treatment at 700°C for 1 h, and the electrochemical properties of the prepared nanosized Co powders were examined to evaluate their suitability as an anode material of Li-ion batteries. Nanosized amorphous Co-based powders could be synthesized by a chemical reduction method in which a reducing agent is added to a Co ion-dissolved aqueous solution. When the prepared nanosized Co-based powders were subjected to carbon-coating heat treatment at 700°C for 1 h, the amorphous phase was crystallized, and a Co single phase could be obtained. The Co-based powder prepared by chemical reduction with CTAB and carbon-coating heat treatment had a smaller first discharge capacity (about 557 mAh/g) than the Co-based powder prepared by chemical reduction without CTAB and carbon-coating heat treatment (about 628 mAh/g). However, the former had a better cycling performance than the latter from the third cycle. The carbon-coated layers are believed to have led to quite good cycling performances of the prepared Co-based powders from the third cycle.

Controlling the Voltage Window for Improved Cycling Performance of SnO2 as Anode Material for Lithium-Ion Batteries

2020 ◽  
Vol 20 (11) ◽  
pp. 7051-7056
Author(s):  
Jungwon Heo ◽  
Anupriya K. Haridas ◽  
Xueying Li ◽  
Rakesh Saroha ◽  
Younki Lee ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Oxide Materials ◽  
Capacity Fading ◽  
Lithium Ions ◽  
Volume Variation ◽  
Capacity Decay

Transition metal oxide materials with high theoretical capacities have been studied as substitutes for commercial graphite in lithiumion batteries. Among these, SnO2 is a promising alloying reaction-based anode material. However, the problem of rapid capacity fading in SnO2 due to volume variation during the alloying/dealloying processes must be solved. The lithiation of SnO2 results in the formation of a Li2O matrix. Herein, the volume variation of SnO2 was suppressed by controlling the voltage window to 1 V to prevent the delithiation reaction between Li2O and Sn. Using this strategy the unreacted Li2O matrix was enriched with metallic Sn particles, thereby providing a pathway for lithium ions. The specific capacity decay in the voltage window of 0.05–3 V was 1.8% per cycle. However, the specific capacity decay was improved to 0.04% per cycle after the voltage window was restricted (in the range of 0.05–1 V). This strategy resulted in a specific capacity of 374.7 mAh g−1 at 0.1 C after 40 cycles for the SnO2 anode.

scholarly journals Electrochemical properties of a silicon nanoparticle/hollow graphite fiber/carbon coating composite as an anode for lithium-ion batteries

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36735-36743 ◽  
Author(s):  
Liyong Wang ◽  
Zhanjun Liu ◽  
Quangui Guo ◽  
Xiaohui Guo ◽  
Jianjun Gu
Keyword(s):  
Lithium Ion Batteries ◽  
Carbon Coating ◽  
Silicon Nanoparticles ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Graphite Fiber ◽  
Lithium Storage ◽  
Silicon Nanoparticle ◽  
Coating Composite ◽  
Graphite Fibers

Hollow graphite fibers and carbon coating were applied to improve lithium storage and cycling performance of silicon nanoparticles.

scholarly journals Electrospun Fe3O4-Sn@Carbon Nanofibers Composite as Efficient Anode Material for Li-Ion Batteries

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2203
Author(s):  
Hong Wang ◽  
Yuejin Ma ◽  
Wenming Zhang
Keyword(s):  
Anode Materials ◽  
Electrochemical Reaction ◽  
Active Material ◽  
Specific Capacity ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Solvothermal Reaction ◽  
Li Ion Batteries ◽  
Li Ion ◽  
A Current

Nanoscale Fe3O4-Sn@CNFs was prepared by loading Fe3O4 and Sn nanoparticles onto CNFs synthesized via electrostatic spinning and subsequent thermal treatment by solvothermal reaction, and were used as anode materials for lithium-ion batteries. The prepared anode delivers an excellent reversible specific capacity of 1120 mAh·g−1 at a current density of 100 mA·g−1 at the 50th cycle. The recovery rate of the specific capacity (99%) proves the better cycle stability. Fe3O4 nanoparticles are uniformly dispersed on the surface of nanofibers with high density, effectively increasing the electrochemical reaction sites, and improving the electrochemical performance of the active material. The rate and cycling performance of the fabricated electrodes were significantly improved because of Sn and Fe3O4 loading on CNFs with high electrical conductivity and elasticity.

scholarly journals Improved cycling stability of LiCoO2 at 4.5 V via surface modification of cathode plates with conductive LLTO

2020 ◽  
Author(s):  
Shipai Song ◽  
Xiang Peng ◽  
Kai Huang ◽  
Hao Zhang ◽  
Fang Wu ◽  
...  
Keyword(s):  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
High Energy ◽  
High Energy Density ◽  
Coating Materials ◽  
Stability Issue ◽  
Rate Capacity ◽  
The Stability ◽  
Stability Issues

Abstract The stability issue of LiCoO 2 cycled at high voltages is one of the burning questions for the development of lithium ion batteries with high energy density and long cycling life. Although it is effective to improve the cycling performance of LiCoO 2 via coating individual LiCoO 2 particles with another metal oxides or fluorides, the rate capacity is generally compromised because the typical coating materials are poor conductors. Herein, amorphous Li 0.33 La 0.56 TiO 3 , one of the most successful solid electrolytes, was directly deposited on the surface of made-up LiCoO 2 cathode plates through magnetron sputtering. Not only the inherent conductive network in the made-up LiCoO 2 cathode plates was retained, but also the Li + transport in bulk and across the cathode-electrolyte interface was enhanced. In addition, the surface chemical analysis of the cycled LiCoO 2 cathode plates suggests that most of the stability issues can be addressed via the deposition of amorphous Li 0.33 La 0.56 TiO 3 . With an optimized deposition time, the LiCoO 2 cathode plates modified by Li 0.33 La 0.56 TiO 3 performed a steady reversible capacity of 150 mAh/g at 0.2 C with the cut-off voltage from 2.75 to 4.5 V vs. Li + /Li, and an 84.6% capacity gain at 5 C comparing with the pristine one.

The Effect of WC Doping on the Electrochemical Behavior of Nanosilicon/CMC/AB Composite Electrode

2011 ◽  
Vol 328-330 ◽  
pp. 1585-1588
Author(s):  
Zhong Sheng Wen ◽  
Dong Lu ◽  
Jun Cai Sun ◽  
Shi Jun Ji
Keyword(s):  
Mechanical Properties ◽  
Electrochemical Behavior ◽  
Composite Electrode ◽  
Lithium Ion ◽  
Composite Electrodes ◽  
X Ray Diffraction ◽  
Capacity Retention ◽  
Lithium Ions ◽  
Host Materials

Silicon is the most attractive anode material of all known host materials for lithium ion batteries because of its high theoretical lithium-insertion capacity up to 4200 mAh g-1, but it is difficult to be applied for its poor cyclability caused by the mechanical invalidation for the insertion of lithium ions. Nanosilicon/CMC/AB composite electrodes doped with WC were prepared by ball milling. The effect of the structure transformation of the doped electrode on the electrochemical behavior was systematically analyzed by X-ray diffraction. The mechanical properties of doped silicon electrode play an important role on its long-term electrochemical stability. The capacity retention could be maintained about 90% after 40 cycles. It was demonstrated that the cycling stability of the nanosilicon composite electrode could get a great promotion by WC doping. The intensification of the mechanical properties is critical to enhance the performance of the composite electrode.

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