scholarly journals Li-ion battery material under high pressure: amorphization and enhanced conductivity of Li4Ti5O12

2018 ◽  
Vol 6 (2) ◽  
pp. 239-246 ◽  
Author(s):  
Yanwei Huang ◽  
Yu He ◽  
Howard Sheng ◽  
Xia Lu ◽  
Haini Dong ◽  
...  
Keyword(s):  
High Pressure ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Ion Migration ◽  
Order Of Magnitude ◽  
Li Ion ◽  
Battery Material ◽  
Enhanced Conductivity ◽  
Insight Into

Abstract Lithium titanium oxide (Li4Ti5O12, LTO), a ‘zero-strain’ anode material for lithium-ion batteries, exhibits excellent cycling performance. However, its poor conductivity highly limits its applications. Here, the structural stability and conductivity of LTO were studied using in situ high-pressure measurements and first-principles calculations. LTO underwent a pressure-induced amorphization (PIA) at 26.9 GPa. The impedance spectroscopy revealed that the conductivity of LTO improved significantly after amorphization and that the conductivity of decompressed amorphous LTO increased by an order of magnitude compared with its starting phase. Furthermore, our calculations demonstrated that the different compressibility of the LiO6 and TiO6 octahedra in the structure was crucial for the PIA. The amorphous phase promotes Li+ diffusion and enhances its ionic conductivity by providing defects for ion migration. Our results not only provide an insight into the pressure depended structural properties of a spinel-like material, but also facilitate exploration of the interplay between PIA and conductivity.

An in situ formed Se/CMK-3 composite for rechargeable lithium-ion batteries with long-term cycling performance

2016 ◽  
Vol 4 (35) ◽  
pp. 13646-13651 ◽  
Author(s):  
Cheng Zheng ◽  
Minying Liu ◽  
Wenqiang Chen ◽  
Lingxing Zeng ◽  
Mingdeng Wei
Keyword(s):  
Lithium Ion Batteries ◽  
Lithium Ion ◽  
Cycling Performance ◽  
High Rate ◽  
Rate Performance ◽  
Li Ion ◽  
Ion Intercalation ◽  
High Rate Performance

A Se/CMK-3 composite was in situ synthesized, exhibiting large capacity, high rate performance and excellent long-term cycling stability for Li-ion intercalation.

scholarly journals A cooperative biphasic MoOx–MoPx promoter enables a fast-charging lithium-ion battery

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Sang-Min Lee ◽  
Junyoung Kim ◽  
Janghyuk Moon ◽  
Kyu-Nam Jung ◽  
Jong Hwa Kim ◽  
...  
Keyword(s):  
Anode Materials ◽  
Surface Engineering ◽  
Dominant Role ◽  
Lithium Ion ◽  
Cycling Performance ◽  
Graphite Anode ◽  
Graphite Surface ◽  
High Rate ◽  
Fast Charging ◽  
Li Ion

AbstractThe realisation of fast-charging lithium-ion batteries with long cycle lifetimes is hindered by the uncontrollable plating of metallic Li on the graphite anode during high-rate charging. Here we report that surface engineering of graphite with a cooperative biphasic MoOx–MoPx promoter improves the charging rate and suppresses Li plating without compromising energy density. We design and synthesise MoOx–MoPx/graphite via controllable and scalable surface engineering, i.e., the deposition of a MoOx nanolayer on the graphite surface, followed by vapour-induced partial phase transformation of MoOx to MoPx. A variety of analytical studies combined with thermodynamic calculations demonstrate that MoOx effectively mitigates the formation of resistive films on the graphite surface, while MoPx hosts Li+ at relatively high potentials via a fast intercalation reaction and plays a dominant role in lowering the Li+ adsorption energy. The MoOx–MoPx/graphite anode exhibits a fast-charging capability (<10 min charging for 80% of the capacity) and stable cycling performance without any signs of Li plating over 300 cycles when coupled with a LiNi0.6Co0.2Mn0.2O2 cathode. Thus, the developed approach paves the way to the design of advanced anode materials for fast-charging Li-ion batteries.

scholarly journals Dealloying-Derived Nanoporous Cu6Sn5 Alloy as Stable Anode Materials for Lithium-Ion Batteries

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4348
Author(s):  
Chi Zhang ◽  
Zheng Wang ◽  
Yu Cui ◽  
Xuyao Niu ◽  
Mei Chen ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Coulombic Efficiency ◽  
Lithium Ion ◽  
Specific Area ◽  
Cycling Performance ◽  
Ex Situ ◽  
Li Ion ◽  
Xrd Patterns ◽  
Cu6sn5 Alloy

The volume expansion during Li ion insertion/extraction remains an obstacle for the application of Sn-based anode in lithium ion-batteries. Herein, the nanoporous (np) Cu6Sn5 alloy and Cu6Sn5/Sn composite were applied as a lithium-ion battery anode. The as-dealloyed np-Cu6Sn5 has an ultrafine ligament size of 40 nm and a high BET-specific area of 15.9 m2 g−1. The anode shows an initial discharge capacity as high as 1200 mA h g−1, and it remains a capacity of higher than 600 mA h g−1 for the initial five cycles at 0.1 A g−1. After 100 cycles, the anode maintains a stable capacity higher than 200 mA h g−1 for at least 350 cycles, with outstanding Coulombic efficiency. The ex situ XRD patterns reveal the reverse phase transformation between Cu6Sn5 and Li2CuSn. The Cu6Sn5/Sn composite presents a similar cycling performance with a slightly inferior rate performance compared to np-Cu6Sn5. The study demonstrates that dealloyed nanoporous Cu6Sn5 alloy could be a promising candidate for lithium-ion batteries.

scholarly journals Enhanced cycling performance of nanostructure LiFePO4/C composites with in situ 3D conductive networks for high power Li-ion batteries

RSC Advances ◽  
2018 ◽  
Vol 8 (73) ◽  
pp. 41850-41857 ◽  
Author(s):  
Chunsong Zhao ◽  
Lu-Ning Wang ◽  
Jitao Chen ◽  
Min Gao
Keyword(s):  
High Power ◽  
Cycling Performance ◽  
High Rate ◽  
Li Ion Batteries ◽  
Li Ion

Excellent cycling performance for a high rate LiFePO4/C composite with in situ 3D conductive networks.

Probing Li-ion concentration in an operating lithium ion battery using in situ Raman spectroscopy

2020 ◽  
Vol 449 ◽  
pp. 227361 ◽  
Author(s):  
Zi Wei ◽  
Amir Salehi ◽  
Guanzhou Lin ◽  
Jie Hu ◽  
Xinfang Jin ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Lithium Ion Battery ◽  
Lithium Ion ◽  
Ion Concentration ◽  
In Situ Raman Spectroscopy ◽  
In Situ Raman ◽  
Li Ion

An experimental insight into the advantages of in situ solvothermal route to construct 3D graphene-based anode materials for lithium-ion batteries

Nano Energy ◽  
2015 ◽  
Vol 16 ◽  
pp. 235-246 ◽  
Author(s):  
Jingjing Ma ◽  
Yu-Shi He ◽  
Weimin Zhang ◽  
Jiulin Wang ◽  
Xiaowei Yang ◽  
...  
Keyword(s):  
Lithium Ion Batteries ◽  
Anode Materials ◽  
Lithium Ion ◽  
3D Graphene ◽  
Solvothermal Route ◽  
Insight Into

In situ synthesis of GeO2/reduced graphene oxide composite on Ni foam substrate as a binder-free anode for high-capacity lithium-ion batteries

2015 ◽  
Vol 3 (4) ◽  
pp. 1619-1623 ◽  
Author(s):  
Heyuan Qiu ◽  
Lingxing Zeng ◽  
Tongbin Lan ◽  
Xiaokun Ding ◽  
Mingdeng Wei
Keyword(s):  
High Capacity ◽  
Rate Capability ◽  
Lithium Ion ◽  
Reversible Capacity ◽  
Cycling Performance ◽  
Dip Coating ◽  
Reduced Graphene ◽  
Binder Free ◽  
Hydrolysis Of

The GeO2/RGO electrode is successfully fabricated via a facile dip-coating route cooperated with in situ hydrolysis of GeCl4 and used directly as a binder-free anode for LIBs. This material exhibited high reversible capacity, good cycling performance and excellent rate capability.

In situ formation of NbOx@NbN microcomposites: seeking potential in photocatalytic and Li-ion battery applications

2018 ◽  
Vol 42 (2) ◽  
pp. 1300-1308 ◽  
Author(s):  
Xiaoqing Ma ◽  
Yang Chen ◽  
Jordan Lee ◽  
Chaofan Yang ◽  
Xiaoli Cui
Keyword(s):  
Hydrogen Production ◽  
Thermal Oxidation ◽  
Lithium Ion ◽  
Li Ion Battery ◽  
Photocatalytic Hydrogen Production ◽  
Ion Storage ◽  
Li Ion ◽  
In Situ Formation

A NbOx@NbN microcomposite formed by in situ partial thermal oxidation is revealed to be potentially advantageous in photocatalytic hydrogen production and lithium-ion storage.

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