Synthesis of Arylene Ether-Type Hyperbranched Poly(triphenylamine) for Lithium Battery Cathodes

We synthesized a new poly(triphenylamine), having a hyperbranched structure, and employed it in lithium-ion batteries as an organic cathode material. Two types of monomers were prepared with hydroxyl groups and nitro leaving groups, activated by a trifluoromethyl substituent, and then polymerized via the nucleophilic aromatic substitution reaction. The reactivity of the monomers differed depending on the number of hydroxyl groups and the A2B type monomer with one hydroxyl group successfully produced poly(triphenylamine). Based on thermal, optical, and electrochemical analyses, a composite poly(triphenylamine) electrode was made. The electrochemical performance investigations confirmed that the lithium-ion batteries, fabricated with the poly(triphenylamine)-based cathodes, had reasonable specific capacity values and stable cycling performance, suggesting the potential of this hyperbranched polymer in cathode materials for lithium-ion batteries.

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Tin Oxide Encapsulated into Pyrolyzed Chitosan as a Negative Electrode for Lithium Ion Batteries

Materials ◽

10.3390/ma14051156 ◽

2021 ◽

Vol 14 (5) ◽

pp. 1156

Author(s):

Andrzej P. Nowak ◽

Maria Gazda ◽

Marcin Łapiński ◽

Zuzanna Zarach ◽

Konrad Trzciński ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Tin Oxide ◽

Electrode Materials ◽

Specific Capacity ◽

Negative Electrode ◽

Lithium Ion ◽

Hydroxyl Groups ◽

Potential Candidate ◽

Surface Hydroxyl ◽

Diffusion Controlled

Tin oxide is one of the most promising electrode materials as a negative electrode for lithium-ion batteries due to its higher theoretical specific capacity than graphite. However, it suffers lack of stability due to volume changes and low electrical conductivity while cycling. To overcome these issues, a new composite consisting of SnO2 and carbonaceous matrix was fabricated. Naturally abundant and renewable chitosan was chosen as a carbon source. The electrode material exhibiting 467 mAh g−1 at the current density of 18 mA g−1 and a capacity fade of only 2% after 70 cycles is a potential candidate for graphite replacement. Such good electrochemical performance is due to strong interaction between amine groups from chitosan and surface hydroxyl groups of SnO2 at the preparation stage. However, the charge storage is mainly contributed by a diffusion-controlled process showing that the best results might be obtained for low current rates.

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

Journal of Nanoscience and Nanotechnology ◽

10.1166/jnn.2020.18834 ◽

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.

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Hierarchical NiCo2S4 hollow spheres as a high performance anode for lithium ion batteries

RSC Advances ◽

10.1039/c5ra14412d ◽

2015 ◽

Vol 5 (103) ◽

pp. 84711-84717 ◽

Cited By ~ 32

Author(s):

Rencheng Jin ◽

Dongmei Liu ◽

Chunping Liu ◽

Gang Liu

Keyword(s):

Lithium Ion Batteries ◽

High Performance ◽

Specific Capacity ◽

Hollow Spheres ◽

Rate Capability ◽

Lithium Ion ◽

Cycling Performance ◽

High Specific Capacity ◽

Good Rate Capability

Hierarchical NiCo2S4 hollow spheres have been fabricated, which exhibit a high specific capacity, good rate capability and stable cycling performance.

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TiO2 Hollow Spheres With Flower-Like SnO2 Shell as Anodes for Lithium-Ion Batteries

Frontiers in Chemistry ◽

10.3389/fchem.2021.660309 ◽

2021 ◽

Vol 9 ◽

Author(s):

Ying Weng ◽

Ziying Zhang ◽

Huizhen Zhang ◽

Yangyang Zhou ◽

Xiaona Zhao ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Specific Capacity ◽

Hollow Spheres ◽

Lithium Ion ◽

Mesoporous Structure ◽

Cycling Performance ◽

Commercial Application ◽

Ion Migration ◽

Current Densities ◽

Tio2 Hollow Spheres

SnO2 is a promising anode material for lithium-ion batteries due to its high theoretical specific capacity and low operation voltage. However, its poor cycling performance hinders its commercial application. In order to improve the cycling stability of SnO2 electrodes, novel flower-like SnO2/TiO2 hollow spheres were prepared by facile hydrothermal method using carbon spheres as templates. Their flower-like shell and mesoporous structure highlighted a large specific surface area and excellent ion migration performance. Their TiO2 hollow sphere matrix and 2D SnO2 nano-flakes ensured good cycle stability. The electrochemical measurements indicated that novel flower-like SnO2/TiO2 hollow spheres delivered a high specific capacity, low irreversible capacity loss and superior rate performance. After 1,000 cycles at current densities of 200 mA g−1, the capacity of the flower-like SnO2/TiO2 hollow spheres was still maintained at 720 mAh g−1. Their rate capacity reached 486 mAh g−1 when the current densities gradually increase to 2,000 mA g−1.

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A carob-inspired nanoscale design of yolk–shell Si@void@TiO2-CNF composite as anode material for high-performance lithium-ion batteries

Dalton Transactions ◽

10.1039/c9dt01130g ◽

2019 ◽

Vol 48 (20) ◽

pp. 6846-6852 ◽

Cited By ~ 5

Author(s):

Chenle Zhang ◽

Jingbo Yang ◽

Hongwei Mi ◽

Yongliang Li ◽

Peixin Zhang ◽

...

Keyword(s):

Lithium Ion Batteries ◽

Anode Material ◽

High Performance ◽

Specific Capacity ◽

Lithium Ion ◽

Cycling Performance ◽

One Dimensional ◽

The One

The one-dimensional yolk–shell structured Si@void@TiO2-CNF anode delivers improved specific capacity and cycling performance for lithium ion batteries.

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Fabrication of GeS-graphene composites for electrode materials in lithium-ion batteries

Materials Research Express ◽

10.1088/2053-1591/ac3a41 ◽

2021 ◽

Author(s):

Chen Li ◽

Xiaoyun Xu ◽

Tingting Song ◽

Xinyu Zhu ◽

Yongtao Li ◽

...

Keyword(s):

Lithium Ion Batteries ◽

High Performance ◽

Electrode Materials ◽

Discharge Rate ◽

Specific Capacity ◽

Lithium Ion ◽

Cycling Performance ◽

Battery Materials ◽

Graphene Composite ◽

Potential Electrode

Abstract The new electrode materials are critically important for the development of lithium-ion batteries (LIBs). Herein, we report the synthesis of GeS-graphene composite (GeS-G) by facile sonication which exhibits the excellent cycling performance for lithium-ion batteries. Under the condition of change-discharge rate of 50 mA·g-1 and voltage window of 0.005-3 V, the specific capacity of GeS-G is 170 mAh·g-1 after 100 cycles, which is significantly higher than that of pure GeS. The results of the present work imply that the nanostructure of GeS-G is the potential electrode materials for application in high-performance lithium-ion batteries and enrich the gene bank of lithium-ion battery materials.

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Facile Synthesis of Fe2O3 Nanomaterials from MIL-101(Fe) Template and Its Application in Lithium Ion Batteries

Journal of Nanomaterials ◽

10.1155/2019/3108742 ◽

2019 ◽

Vol 2019 ◽

pp. 1-5

Author(s):

Chunyan Zhang ◽

Nianqiao Qin ◽

Jing Li ◽

Yan Tian ◽

Hui Zhang

Keyword(s):

Lithium Ion Batteries ◽

Metal Organic Framework ◽

Specific Capacity ◽

Lithium Ion ◽

Cycling Performance ◽

Cycle Performance ◽

High Specific Capacity ◽

Calcination Process ◽

Metal Organic ◽

Initial Cycle

Sponge-like porous Fe2O3 nanomaterials were obtained through the calcination process of the iron-based metal organic framework (MIL-101). As anode materials for lithium-ion batteries, thus, obtained products show a good electrochemical performance with a high specific capacity (1358 mA h g-1 at 100 mA g-1 in the initial cycle) and a relatively stable cycle performance (750 mA h g-1 after 80 charge/discharge cycles). The superior cycling performance may be attributed to their special structure, which facilitates charge transfer and Li+ diffusion.

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High Performance Tin-coated Vertically Aligned Carbon Nanofiber Array Anode for Lithium-ion Batteries

MRS Advances ◽

10.1557/adv.2018.520 ◽

2018 ◽

Vol 3 (60) ◽

pp. 3519-3524

Author(s):

Gaind P. Pandey ◽

Kobi Jones ◽

Emery Brown ◽

Jun Li ◽

Lamartine Meda

Keyword(s):

Lithium Ion Batteries ◽

High Performance ◽

Carbon Nanofiber ◽

Specific Capacity ◽

High Capacity ◽

Lithium Ion ◽

Reversible Capacity ◽

Cycling Performance ◽

Vertically Aligned ◽

Vertically Aligned Carbon Nanofiber

ABSTRACTThis study reports a high-performance tin (Sn)-coated vertically aligned carbon nanofiber array anode for lithium-ion batteries. The array electrodes have been prepared by coaxial sputter-coating of tin (Sn) shells on vertically aligned carbon nanofiber (VACNF) cores. The robust brush-like highly conductive VACNFs effectively connect high-capacity Sn shells for lithium-ion storage. A high specific capacity of 815 mAh g-1 of Sn was obtained at C/20 rate, reaching toward the maximum value of Sn. However, the electrode shows poor cycling performance with conventional LiPF6 based organic electrolyte. The addition of fluoroethylene carbonate (FEC) improve the performance significantly and the Sn-coated VACNFs anode shows stable cycling performance. The Sn-coated VACNF array anodes exhibit outstanding capacity retention in the half-cell tests with electrolyte containing 10 wt.% FEC and could deliver a reversible capacity of 480 mAh g-1 after 50 cycles at C/3 rate.

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The Effect of Annealing Temperature on the Synthesis of Nickel Ferrite Films as High-Capacity Anode Materials for Lithium Ion Batteries

Nanomaterials ◽

10.3390/nano11123238 ◽

2021 ◽

Vol 11 (12) ◽

pp. 3238

Author(s):

Mansoo Choi ◽

Sung-Joo Shim ◽

Yang-Il Jung ◽

Hyun-Soo Kim ◽

Bum-Kyoung Seo

Keyword(s):

Lithium Ion Batteries ◽

Anode Materials ◽

Specific Capacity ◽

High Capacity ◽

Lithium Ion ◽

Cycling Performance ◽

High Specific Capacity ◽

High Discharge Capacity ◽

Lower Temperature ◽

Libs Applications

Anode materials providing a high specific capacity with a high cycling performance are one of the key parameters for lithium ion batteries’ (LIBs) applications. Herein, a high-capacity NiFe2O4(NFO) film anode is prepared by E-beam evaporation, and the effect of the heat treatment is studied on the microstructure and electrochemical properties of LIBs. The NiFe2O4 film annealed at 800 °C (NFO-800) showed a highly crystallized structure and different surface morphologies when compared to the electrode annealed at a lower temperature (NFO-600, NFO-700). In the electrochemical measurements, the high specific capacity (1804 mA g−1) and capacity retention ratio (95%) after 100 cycles were also achieved by the NFO-800 electrode. The main reason for the good electrochemical performance of the NFO-800 electrode is a high structure integrity, which could improve the cycle stability with a high discharge capacity. The NiFe2O4 electrode with an annealing process could be further proposed as an alternative ferrite material.

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