Wang Dan research group, Institute of process engineering, Chinese Academy of Sciences: design, preparation and energy storage application of SnO2 hollow multi shell structure coated with MOFs derived metal oxides

Homs is a kind of hollow multistage structure with multiple shells and cavities There is a strict order relationship between multiple shells and cavities, which makes Homs materials show unique and excellent performance in energy storage, catalysis, drug release, absorption and other applications (adv mater 2018, DOI: 10.1002/adma.201802874; chem SOC Rev 2015, 44, 6749) A team led by Wang Dan, a researcher from the Institute of process engineering, Chinese Academy of Sciences, has been working on the design and application of Homs materials for more than ten years In 2009, a series of Ferrite Hollow Spheres with hollow multiple shell structure were successfully prepared with carbon spheres as templates (j.phys.chem.c.2009, 113, 2792); in 2011, the "sequential template method (STA)" was formally proposed and used to prepare Homs materials (angel Chem Int ed 2011, 50, 2738), which opened a new era of Homs functional materials research Recently, Wang Dan research team of Institute of process engineering of Chinese Academy of Sciences, in cooperation with Professor Liu Yunling and academician Feng Shouhua of Jilin University, put forward a new idea of design and preparation of electrode materials with high capacity and high stability: 1) build an efficient Homs buffer structure to overcome volume expansion; 2) the coating has MOFs derived from MOFs The oxide layer with structural information can form a uniform and porous heterostructure, so as to overcome the pulverization and agglomeration of electrode materials caused by repeated insertion and removal of lithium ions Based on the above new idea, SnO2 @ Fe2O3 (MOF) homss electrode material with high capacity and high stability was designed and prepared Relevant research results were published in the international authoritative academic journal angel Chem Int ed (DOI: 10.1002 / anie 201814563) under the title of "hollow multi ‐ shell structural metal organic frameworks evolutionary heterogeneous casting for enhanced lithium storage" For more wonderful work of researcher Wang Dan, please visit www.wd-homes.cn Introduction to researcher Wang Dan, researcher, doctoral supervisor In 1997, he received a master's degree from Jilin University, a scholarship from the Ministry of culture and culture of Japan to study in Japan in October 1997, and a doctor's degree from the national Yamanashi University of Japan in 2001 From April 2001 to December 2001, he was a very diligent lecturer in the Department of science, Kochi University, Japan; from December 2001 to March 2003, he was a researcher in the catalyst research office of the Research Institute of geoenvironmental industry technology, Japan; from April 2003 to January 2004, he was a special researcher for foreigners in the Japanese academic rejuvenation society, Institute of chemistry, Kyoto University, Japan; 2, 2004 He joined the Institute of process engineering of the Chinese Academy of Sciences in May as a researcher In 2013, he was supported by the National Science Foundation for Distinguished Young Scholars In 2014, he was elected as a member of the Royal Society of chemistry In 2014, he was selected as the "young and middle-aged leading talents of science and technology innovation" of the Ministry of science and technology In 2014, he was awarded the China particle Society - winning and creating the particle science innovation award In 2015, he was awarded the second prize of Beijing Science and Technology Award (the second adult) In 2016, he was selected into the national "ten thousand talents plan" Leading talents were selected as experts enjoying special allowance of the State Council in 2018, and won the first prize of natural science of China particle society in 2018 (the first adult) Mainly engaged in the controllable synthesis of inorganic nanostructured functional particles, the construction of multi-level mesoscale structure, and the study of structure-activity relationship between material structure and performance, especially in the controllable synthesis of hollow multi shell structure (Homs) and its application in energy, catalysis and other fields, which is in the leading position in the world So far, 140 papers have been published in the journals of NAT Chem., NAT Energy, chem SOC Rev., J am Chem SOC., angelw Chem Int ed., adv mater, nano lett, ACS Nano, etc., and selected into the list of "highly cited scientists" in the chemical field of clarivate analytics in 2018 More than 40 Chinese invention patents have been applied for, and 23 have been authorized Served as deputy editor in chief of matter Chem Front., energy energy energy SCI., adv SCI., adv mater Interface, advisor of matter and mater Res express, and editorial board member of SCI Bull., SCI China mater., mater Res innov Cutting edge scientific research achievements: the design and preparation of SnO 2 hollow multi shell structure covered by MOFs derived metal oxide and energy storage application lithium ion battery has become an important new energy industry due to its high capacity, good safety performance, long cycle life and other advantages As a key part of lithium-ion batteries, the design of high capacity and high stability electrode materials is a hot spot in this research field Among them, SnO 2 material has the advantages of high energy density, high safety and abundant reserves, which is expected to become the substitute of traditional graphite anode material However, the volume expansion of SnO 2 electrode material also exists The repeated insertion and removal of lithium ions in the process of charging and discharging can easily cause the electrode material to be powdered and agglomerated, resulting in the large irreversible capacity and poor cycle stability of the electrode material for the first time The key to the study of SnO 2-based electrode materials is to design SnO 2-based electrode materials reasonably to overcome volume expansion and improve cycle stability Figure 1 The preparation process of SnO 2 hollow multi shell structure covered by MOFs derived metal oxides (source: angel Chem Int ed.) To solve this problem, Wang Dan's research team, together with Professor Liu Yunling and academician Feng Shouhua's team, proposed a new idea for the design and preparation of high capacity and high stability electrode materials: 1) Build effective buffer structure to overcome volume expansion That is to say, the electrode material of Homs can effectively relieve the stress caused by the volume expansion during the charging and discharging cycle, and the multi-stage pore structure is conducive to the electrolyte infiltration and charge transfer, improving the storage capacity of lithium ion; 2) the heterogeneous structure is constructed by the coating method to overcome the electrode material pulverization and agglomeration caused by the repeated insertion and removal of lithium ion The traditional direct coating is either too dense to facilitate the charge and electrolyte transport, or the coated particles are relatively independent of each other, which can not play a good role in stability By coating the surface of SnO 2-homs with a dense metal organic framework coat, a fully covered, uniform and porous metal oxide heterolayer was constructed by two-step calcination method, which not only can fully protect the internal SnO 2, but also is conducive to material transport and charge storage Figure 2 Morphology characterization of MOFs coated and derived Homs electrode materials (source: angel Chem Int ed.), in order to achieve this idea, the author first designed and synthesized SnO 2-homs; secondly, the dense MOFs material mil-100 (FE) was coated on the surface of SnO 2-homss Secondly, the heterogeneous SnO 2 @ Fe 2O 3 (MOF) homss materials with full coverage and porosity were obtained by two-step calcination method of carbonizing organic matter and stabilizing metal skeleton in inert atmosphere, and then removing carbon by calcination in air The coated metal oxide not only has uniform and comprehensive coating, but also has the structure information of porous and ordered MOFs, and the electrode material can maintain a stable Homs structure during the whole coating and calcination process The electrochemical properties of SnO2 @ Fe2O3 (MOF) homss showed excellent reversible capacity and cycle stability It was not only much better than the single SnO2 homss structure, but also significantly better than the hetero SnO2 @ Fe2O3 (particle) homss prepared by other methods This shows that the enhancement of this property is not only due to the coating of Fe2O3 on the surface, but also due to the porous structure with MOFs SnO 2 @ Fe 2O 3 (MOF) homss electrode material can maintain a reversible capacity of 750 MAH / G after 100 cycles at a current of 100 mA / g Figure 3 Lithium storage properties of electrode materials with different structures (source: angelw Chem Int ed.) conclusion: Wang Dan research group of Beijing Institute of process engineering, Chinese Academy of Sciences not only successfully synthesized SnO2 @ Fe2O3 (MOF) homss electrode materials with excellent performance At the same time, a general synthesis strategy is proposed, which provides a new idea for the design and construction of heterogeneous Homs materials Dr Zhang Jian and Dr Wan Jiawei are co authors; researcher Wang Dan, Professor Liu Yunling and academician Feng Shouhua are co authors This work was supported by the National Natural Science Foundation of China Nowadays, people and scientific research have been paid more and more attention in the economic life China has ushered in the "node of science and technology explosion" Behind the progress of science and technology is the work of countless scientists In the field of chemistry, in the context of the pursuit of innovation driven, international cooperation has been strengthened, the influence of Returned Scholars in the field of R & D has become increasingly prominent, and many excellent research groups have emerged in China For this reason, CBG information adopts the 1 + X reporting mechanism CBG information, chembeangoapp, chembeango official microblog, CBG wechat subscription number and other platforms jointly launch the column of "people and scientific research", approach the domestic representative research group, pay attention to their research, listen to their stories, record their demeanor, and explore their scientific research spirit.