JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2020
·
IF 3.807
Yan Zhong,Tianli Han,Mengying Cheng,Lin Deng,Chaoquan Hu,Qiya He,Huigang Zhang,Jinyun Liu
Current lithium‑sulfur (Li S) batteries have some severe issues such as shuttle effect of polysulfides and volumetric expansion of sulfur, even though their high theoretical energy density is attractive. Herein, we present a porous multi-walled ZnCo 2 O 4 sphere prepared by a self-reduction approach as sulfur host for Li S battery cathode. During the annealing of an inorganic-organic hybrid precursor, ZnCo 2 O 4 spheres are partially reduced by the released carbon monoxide , resulting in the formation of ZnO and CoO nanoparticles which are subsequently etched by acid, finally forming mesopores throughout the multi-walled ZnCo 2 O 4 spheres. The multi-walled ZnCo 2 O 4 provides sufficient space for accommodating the volumetric change of sulfur. The adsorption measurements show that the multi-walled ZnCo 2 O 4 can adsorb the polysulfides efficiently, which suppresses the shuttle effect. After cycling 1000 times at a rate of 0.5C, the multi-walled ZnCo 2 O 4 @S composite remains a capacity of 590 mAh g −1 . The rate-performance is well recoverable during repeated tests. Moreover, the capacities at relatively low and high temperatures of − 5 and 50 °C are 654 and 619 mAh g −1 after 100 cycles, respectively, indicating a potential for applications
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 17
·2107380
·
IF 15.153
Kunyang Zou,Weitao Jing,Xin Dai,Xinxing Chen,Ming Shi,Zhiyin Yao,Ting Zhu,Junjie Sun,Yuanzhen Chen,Yan Liu,Yongning Liu
High energy density and long cycle life of lithium–sulfur (Li–S) batteries suffer from the shuttle/expansion effect. Sufficient sulfur storage space, local fixation of polysulfides, and outstanding electrical conductivity are crucial for a robust cathode host. Herein, a modified template method is proposed to synthesize a highly regular and uniform nitrogen/oxygen dual-doped honeycomb-like carbon as sulfur host (N/O-HC-S). The unique structure not only offers physical entrapment for polysulfides (LiPSs) but also provides chemical adsorption and catalytic conversion sites of polysulfides. In addition, this structure offers enough space for loading sulfur, and a regular space of nanometer size can effectively prevent sulfur particles from accumulating. As expected, the as-prepared N/O-HC900-S with high areal sulfur loading (7.4 mg cm −2 ) shows a high areal specific capacity of 7.35 mAh cm −2 at 0.2 C. Theoretical calculations also reveal that the strong chemical immobilization and catalytic conversion of LiPSs attributed to the spin density and charge distribution of carbon atoms will be influenced by the neighbor nitrogen/oxygen dopants. This structure that provides cooperative chemical adsorption, high lithium ions flux, and catalytic conversion for LiPSs can offer a new strategy for constructing a polysulfide confinement structure to achieve robust Li–S batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2021
·
IF 8.198
Fan Zhang,Zhi Li,Tong Cao,Kai Qin,Qunjie Xu,Haimei Liu,Yongyao Xia
Lithium–sulfur (Li–S) batteries have higher theoretical capacity and higher energy density, so they are considered to be one of the most promising candidates for next-generation energy storage devices. However, electrolyte-soluble polysulfides cause a shuttle effect and lead to poor cycle stability. This is one of the main obstacles to the practical applications of LSB technology. To overcome this problem, here, we report polar Ni2P hollow microspheres, with multilayer nesting, as sulfur host materials. Specifically, the multilayer polar Ni2P can simultaneously act as a multilayer physical barrier and chemical adsorption material. In addition, the Ni2P microspheres serve as activation catalysts, accelerating the redox reaction kinetics. The above features allow the structure to effectively suppress the shuttle effect and improve the discharge capacity and cycle stability of LSB. For example, the three-dimensional printed Ni2P@S (3DP-Ni2P@S) cathode can provide an initial capacity of 682 mAh/g, obtaining high cycle stability with low-capacity attenuation of 0.0072% per cycle for 400 cycles under 2C. Even when the sulfur loading is increased from 6.1 to 9.3 mg/cm2, this material still shows good capacity retention. This work inspires the design of multifunctional cathode materials and paves a new path for the development of Li–S batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2023
·Vol. 13
·期 5
·865
·
IF 5.3
Yinbo Wu,Yaowei Feng,Xiulian Qiu,Fengming Ren,Jian Cen,Qingdian Chong,Ye Tian,Wei Yang
Lithium-sulfur batteries with high theoretical energy density and cheap cost can meet people’s need for efficient energy storage, and have become a focus of the research on lithium-ion batteries. However, owing to their poor conductivity and “shuttle effect”, lithium-sulfur batteries are difficult to commercialize. In order to solve this problem, herein a polyhedral hollow structure of cobalt selenide (CoSe2) was synthesized by a simple one-step carbonization and selenization method using metal-organic bone MOFs (ZIF-67) as template and precursor. CoSe2is coated with conductive polymer polypyrrole (PPy) to settle the matter of poor electroconductibility of the composite and limit the outflow of polysulfide compounds. The prepared CoSe2@PPy-S composite cathode shows reversible capacities of 341 mAh g−1at 3 C, and good cycle stability with a small capacity attenuation rate of 0.072% per cycle. The structure of CoSe2can have certain adsorption and conversion effects on polysulfide compounds, increase the conductivity after coating PPy, and further enhance the electrochemical property of lithium-sulfur cathode material.Keywords:lithium-sulfur battery;transition metal selenides;metal-organic framework;polypyrrole;sulfur host
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Deyu Qu,Rong Li,Xinxin Zhu,Kai Chen,Yafei Shen,Dan Liu,Zhongyuan Ma,Shichao Zhang,Zhizhong Xie,Junsheng Li,Jiaheng Lei,Haolin Tang
Two types of Resorcinol - Formaldehyde (RF) resin based ordered mesoporous carbon materials were used as sulfur host in lithium sulfur battery system. The effects of carbon material structure, morphology, surface area, pore volume, sulfur loading, electrolyte/sulfur ratio and metallic Pt nanoparticle decoration impact on the adsorption of polysulfides and battery performance are studied. Results show that carbon material carrying rod-like morphology and hexagonal meso-structure can have high sulfur loading due to its high specific surface area and large pore volume. While the one with polyhedral particles and ordered cubic meso-structure exhibits good cyclic stability and good capacity retention due to its good adsorption of polysulfides upon its cage-like pores. After in-situ decorating of Pt nanoparticles, the performance of cyclic stability as well as capacity retention significantly improved and better rate performance is also gained because of the chemisorption of polysulfides and electro-catalytic activity upon Pt.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）