Boron-doped microporous nano carbon as cathode material for high-performance Li-S batteries

Wu, Feng; Qian, Jiasheng; Wu, Weiping; Ye, Yusheng; Sun, Zhiguo; Xu, Bin; Yang, Xiaoguang; Xu, Yuhong; Zhang, Jiatao; Chen, Renjie

doi:10.1007/s12274-016-1303-7

Cited by 48 publications

(30 citation statements)

References 32 publications

(30 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Last but not least, the uniform interface of boron/oxygen codoping designed from the molecular level can increase the electronic/ion conductivity and adsorption capacity for polysulfides/sulfur, which greatly improves electrochemical performance of Li–S batteries. It should be noted that the B/O doping process of this work is different from previous efforts, where B‐containing agents are usually needed to mix with carbon precursors and oxygen doping is usually from the calcination process. In this work, B and O elements are both from the uniformly distributed organic groups (boronic ester) in the COF precursor, therefore more uniform elemental doping at the molecular level should be obtained in the COF‐derived porous carbon, which is vital for their positive effect for electrochemical properties.…”

Section: Resultsmentioning

confidence: 99%

Covalent Organic Framework Derived Boron/Oxygen Codoped Porous Carbon on CNTs as an Efficient Sulfur Host for Lithium–Sulfur Batteries

Chen

et al. 2019

Small Methods

115

View full text Add to dashboard Cite

Boron/oxygen co‐doped carbons (BOC) have great potentials as sulfur host materials for lithium–sulfur batteries, because they can increase electronic conductivity and anchor polysulfides. However, the doping interface as a key chemically active site still lacks in‐depth understanding owing to the difficulty in design at the molecular scale. Herein, the BOC network derived from covalent organic framework (COF) is prepared on the surface of CNTs via rational design of the organic condensation reaction. This strategy enables boron and oxygen heteroatoms to be uniformly doped throughout porous carbon because of the uniformly‐distributed two elements in the COF precursor. Thereby, the BOC matrix is demonstrated to play a pivotal role in promoting the chemical absorption of polysulfides and enhancing cycling stability. The BOC@CNT with 68.5% sulfur shows superior lithium polysulfides absorptivity and displays superior electrochemical performances as a cathode for Li–S batteries, including a large reversible capacity (1077 mA h g−1 after 200 cycles at 0.2 C), and outstanding cycling stability (794 mA h g−1 after 500 cycles at 1 C). The demonstrated strategy for fabricating BOC network by COF precursor for Li–S batteries provides a new approach to rationally design uniform heteroatom interfaces for good electrochemical performances.

show abstract

Section: Resultsmentioning

confidence: 99%

Covalent Organic Framework Derived Boron/Oxygen Codoped Porous Carbon on CNTs as an Efficient Sulfur Host for Lithium–Sulfur Batteries

Chen

et al. 2019

Small Methods

115

View full text Add to dashboard Cite

show abstract

“…Wu et al. synthesized a boron‐doped microporous carbon (BMC), which could physically confine LiPSs and chemically trap the sulfur species on the host surface . When the BMC was used as a sulfur host, the S‐BMC hybrid obtained showed a low capacity decay of 0.056% per cycle for 500 cycles at 3.2 A g −1 .…”

Section: Trappingmentioning

confidence: 99%

Functional Carbons Remedy the Shuttling of Polysulfides in Lithium–Sulfur Batteries: Confining, Trapping, Blocking, and Breaking up

Shi

Zhang

et al. 2018

Adv Funct Materials

172

106

View full text Add to dashboard Cite

Carbon materials are usually used as the sulfur host in rechargeable lithiumsulfur (Li-S) batteries that are considered as promising electrochemical energy storage systems. However, the "shuttling" caused by the soluble lithium polysulfides (LiPSs) formed by the reaction of Li and sulfur causes rapid capacity fade and low sulfur utilization, greatly hindering their practical use. The carbon materials can also be tailored to prevent LiPS shuttling because of their abundant porosity and controllable surface chemical properties, which are divided into four specific functions: confining, trapping, blocking, and breaking up. Confinement means physically confining the LiPSs in pores in the carbon while trapping refers to chemical adsorption on the carbon surface to restrict their diffusion and promote their transformation to insoluble Li 2 S 2 /Li 2 S. Blocking means placing a barrier in the cells to inhibit LiPS diffusion to the anode, while breaking up means decreasing the size of the sulfur moiety to increase its affinity with carbons. The advantages and disadvantages of functional carbons in relation to these four functions are summarized and the specific ways to achieve them are highlighted. The design of advanced carbons with synergistic functions is discussed and some perspectives on the future development of carbons in Li-S batteries are given.

show abstract

“…. [49][50] Meanwhile, the G band intensity ( � 1587 cm À 1 ) relies on the degree of carbon atoms sp 2 hybridization. The broad peak around 26°(2 θ) of BC-1, BC-2, BC-3 shows a typical graphitic carbon (002) diffraction peak.…”

Section: Structure and Morphologymentioning

confidence: 99%

Palladium Nanoparticles Supported on B‐Doped Carbon Nanocage as Electrocatalyst toward Ethanol Oxidation Reaction

Yao

Zhang

et al. 2019

ChemElectroChem

View full text Add to dashboard Cite

Boron-doped carbon nanocage (BC-2) was used as carrier to anchor palladium nanoparticles and enhanced the catalytic performance for the ethanol oxidation reaction. The BC-2 was synthesized via thermal treatment the predesigned compound containing cobalt and boron at 900°C with the help of hydrogen and acid washing process. Palladium nanoparticles can be loaded on the BC-2 supports (Pd/BC-2) for ethanol oxide reaction (EOR). The BC-2 support has the following character-istics: (i) The hollow structure contains highly order nanoporous to offer more channel and space in catalysis process; (ii) borondoped carbon structures can supply abundant activity sites for stabilizing palladium nanoparticles; (iii) the unique three-dimensional architecture can prevent the agglomeration and inactivation of metal catalysts. The Pd/BC-2 catalyst displays higher catalytic activities 3614.11 mA mg À 1 toward the peak current density compared to that of Pd/C (804.39 mA mg À 1 ).

show abstract

Boron-doped microporous nano carbon as cathode material for high-performance Li-S batteries

Cited by 48 publications

References 32 publications

Covalent Organic Framework Derived Boron/Oxygen Codoped Porous Carbon on CNTs as an Efficient Sulfur Host for Lithium–Sulfur Batteries

Covalent Organic Framework Derived Boron/Oxygen Codoped Porous Carbon on CNTs as an Efficient Sulfur Host for Lithium–Sulfur Batteries

Functional Carbons Remedy the Shuttling of Polysulfides in Lithium–Sulfur Batteries: Confining, Trapping, Blocking, and Breaking up

Palladium Nanoparticles Supported on B‐Doped Carbon Nanocage as Electrocatalyst toward Ethanol Oxidation Reaction

Contact Info

Product

Resources

About