A New Salt‐Baked Approach for Confining Selenium in Metal Complex‐Derived Porous Carbon with Superior Lithium Storage Properties

Li, Xiaona; Liang, Jianwen; Hou, Zhiguo; Zhang, Wanqun; Wang, Yan; Zhu, Yongchun; Qian, Yitai

doi:10.1002/adfm.201501956

Cited by 122 publications

(74 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Moreover, the low voltage plateau of carbon readily leads to the formation of sodium dendrites and causes severe safety concerns . Metal oxides/sulfides suffer from enormous volume expansion and intermediate dissolution, resulting in poor cycling stability and capacity retention . The exploration of new electrode materials is highly desirable for SIBs.…”

Section: Introductionmentioning

confidence: 99%

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

Pan

Chen

Zhang

et al. 2018

Adv Funct Materials

View full text Add to dashboard Cite

SnP 2 O 7 attached to reduced graphene oxide (rGO) is synthesized by a solvothermal reaction, followed by a mild annealing in Ar/H 2 . As an anode material for sodium-ion batteries, this composite is associated with the conversion reaction between Sn and SnP 2 O 7 and the alloy reaction between Sn and Na x Sn, as evidenced by ex situ techniques, such as high-resolution transmission electron microscope images, selected area electron diffraction patterns, and X-ray diffraction patterns. The close contact between SnP 2 O 7 and rGO facilitates the charge transfer upon cycling and benefits the preservation of SnP 2 O 7 on rGO even after pulverization. Therefore, this composite exhibits an extraordinary cycling stability. 99% of the initial capacity is remained after 200 cycles at 0.2 A g −1 and also 99% is kept after 1000 cycles at 1.0 A g −1 . The similar results are also observed in full cells. Quantitative kinetic analysis confirms that sodium storage in this composite is governed by pseudocapacitance, especially at high rates. These results indicate the promising potential of metal pyrophosphates in sodium-ion batteries.

show abstract

Section: Introductionmentioning

confidence: 99%

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

Pan

Chen

Zhang

et al. 2018

Adv Funct Materials

View full text Add to dashboard Cite

show abstract

“…However, the intrinsic challenges of RT NaS batteries have been far from completely solved. To circumvent these problems, the current efforts are mainly concentrated on improving the electrical conductivity and entrapping the active material within the cathode region, which include microporous/mesoporous carbon-selenium, [37][38][39] slit microporous carbon-selenium, [34] and flexible porous carbon nanofiberselenium. [34][35][36] However, bulk Se particles still suffer from low active material utilization and Coulombic efficiency due to its electronically insulating properties and shuttling of high-order polyselenides.…”

mentioning

confidence: 99%

Long Cycle Life, Low Self‐Discharge Sodium–Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling

Wang

Jiang

Manthiram

2017

Advanced Energy Materials

View full text Add to dashboard Cite

of sodium. [9,13] In addition, the electrode dynamics and thermodynamic knowledge accrued recently for LIBs could be employed to ensure rapid advances in SIBs. [14][15][16][17][18] Thus, development of viable room-temperature sodium-ion batteries is attracting increasing attention. [19][20][21][22][23][24] Recently, room-temperature (RT) sodium-sulfur (NaS) batteries, based on the conversion reaction chemistry, have triggered extensive research interest due to the high charge-storage capacity and the abundance of both sodium and sulfur. [25][26][27][28][29][30] However, the practical applications of RT NaS batteries are facing two major challenges: (i) sulfur has a low electronic conductivity (5 × 10 −30 S cm −1 at 25 °C), thus leading to sluggish electrochemical reaction processes and low utilization of the active sulfur in the electrode; (ii) severe "polysulfide shuttle effect," i.e., migration of dissolved polysulfide intermediate products through the porous separator between the cathode and the anode, which leads to rapid capacity fade during cycling. [31] Many approaches have been pursued to mitigate these issues, including employing modified separators, [30] porous carbon matrix, [26] etc. However, the intrinsic challenges of RT NaS batteries have been far from completely solved. Selenium is a chemical analogue of S [32,33] and is considered to be an alternative electrode materials for SIBs due to its much higher electronic conductivity (1 × 10 −3 S m −1 ) as indicated in Figure S1 in the Supporting Information, volumetric capacity (3253 A h L −1 ) comparable to that of S (3467 A h L −1 ), and stable function in the relatively low-cost carbonate-based electrolytes. [34][35][36] However, bulk Se particles still suffer from low active material utilization and Coulombic efficiency due to its electronically insulating properties and shuttling of high-order polyselenides. To circumvent these problems, the current efforts are mainly concentrated on improving the electrical conductivity and entrapping the active material within the cathode region, which include microporous/mesoporous carbon-selenium, [37][38][39] slit microporous carbon-selenium, [34] and flexible porous carbon nanofiberselenium. [40,41] With these approaches, the introduction of additional components (such as carbon black and binders) often lowers the energy density of NaSe batteries. Also, fabrication of these electrodes often involves complex multistep processes.In light of these pros and cons, we present herein a facile and scalable strategy to design carbon nanofiber (CNF)/selenium The use of selenium as a cathode in rechargeable sodium-selenium batteries is hampered by low Se loading, inferior electrode kinetics, and polyselenide shuttling between the cathode and anode. Here a high-performance sodiumselenium cell is presented by coupling a binder-free, self-interwoven carbon nanofiber-selenium cathode with a light-weight carbon-coated bifunctional separator. With this strategy, electrodes with a high Se mass loading (4.4 mg cm −2 ) rende...

show abstract

“…When cycled at a current density of 0.5 A g −1 , 430 mA h g −1 capacity is achieved after 300 cycles with a small capacity fading of 0.067% per cycle and the CE approaching 100%, indicating the excellent electrochemical reversibility of Se@MCNFs. Meanwhile, the long cycling performance of the Se@MCNF membrane is superior to other Se‐based cathode materials, as shown in Table 1 . The rate capability (Figure S4d, Supporting Information) and long cycling performance (Figure S4e, Supporting Information) of Se/MCNFs are measured under the same condition, but it exhibits a poor sodium storage performance.…”

Section: The Long Cycling Performance Comparison For the Published Sementioning

confidence: 99%

A Freestanding and Long‐Life Sodium–Selenium Cathode by Encapsulation of Selenium into Microporous Multichannel Carbon Nanofibers

Yuan

Sun

Zeng

et al. 2017

Small

View full text Add to dashboard Cite

Selenium cathode has attracted more and more attention because of its comparable volumetric capacity but much higher electrical conductivity than sulfur cathode. Compared to Li-Se batteries, Na-Se batteries show many advantages, including the low cost of sodium resources and high volumetric capacity. However, Na-Se batteries still suffer from the shuttle effect of polyselenides and high volumetric expansion, resulting in the poor electrochemical performance. Herein, Se is impregnated into microporous multichannel carbon nanofibers (Se@MCNFs) thin film with high flexibility as a binder-free cathode material for Na-Se batteries. The fibrous unique structure of the Se@MCNFs is beneficial to alleviate the volume change of Se during cycling, improve the utilization of active material, and suppress the dissolution of polyselenides into electrolyte. The freestanding Se@MCNF thin-film electrode exhibits high discharge capacity (596 mA h g at the 100th cycle at 0.1 A g ) and excellent rate capability (379 mA h g at 2 A g ) for Na-Se batteries. In addition, it also shows long cycle life with a negligible capacity decay of 0.067% per cycle over 300 cycles at 0.5 A g . This work demonstrates the possibility to develop high performance Na-Se batteries and flexible energy storage devices.

show abstract

A New Salt‐Baked Approach for Confining Selenium in Metal Complex‐Derived Porous Carbon with Superior Lithium Storage Properties

Cited by 122 publications

References 45 publications

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

Long Cycle Life, Low Self‐Discharge Sodium–Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling

A Freestanding and Long‐Life Sodium–Selenium Cathode by Encapsulation of Selenium into Microporous Multichannel Carbon Nanofibers

Contact Info

Product

Resources

About

A New Salt‐Baked Approach for Confining Selenium in Metal Complex‐Derived Porous Carbon with Superior Lithium Storage Properties

Cited by 122 publications

References 45 publications

SnP2O7 Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

SnP2O7 Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

Long Cycle Life, Low Self‐Discharge Sodium–Selenium Batteries with High Selenium Loading and Suppressed Polyselenide Shuttling

A Freestanding and Long‐Life Sodium–Selenium Cathode by Encapsulation of Selenium into Microporous Multichannel Carbon Nanofibers

Contact Info

Product

Resources

About

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries

SnP₂O₇ Covered Carbon Nanosheets as a Long‐Life and High‐Rate Anode Material for Sodium‐Ion Batteries