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07 Aug 14:40

Ground-state electron transfer in all-polymer donor–acceptor heterojunctions

by Kai Xu

Nature Materials, Published online: 09 March 2020; doi:10.1038/s41563-020-0618-7

Doping through spontaneous electron transfer between donor and acceptor polymers is obtained by selecting organic semiconductors with suitable electron affinity and ionization energy, achieving high conductivity in blends and bilayer configuration.
11 Jan 09:01

Recent Progress on Spray Pyrolysis for High Performance Electrode Materials in Lithium and Sodium Rechargeable Batteries

by Yujie Zhu, Seung Ho Choi, Xiulin Fan, Jaeho Shin, Zhaohui Ma, Michael R. Zachariah, Jang Wook Choi, Chunsheng Wang

Advanced electrode materials have been intensively explored for next-generation lithium-ion batteries (LIBs), and great progresses have been achieved for many potential candidates at the lab-scale. To realize the commercialization of these materials, industrially-viable synthetic approaches are urgently needed. Spray pyrolysis (SP), which is highly scalable and compatible with on-line continuous production processes, offers great fidelity in synthesis of electrode materials with complex architectures and chemistries. In this review, motivated by the rapid advancement of the given technology in the battery area, we have summarized the recent progress on SP for preparing a great variety of anode and cathode materials of LIBs with emphasis on their unique structures generated by SP and how the structures enhanced the electrochemical performance of various electrode materials. Considering the emerging popularity of sodium-ion batteries (SIBs), recent electrode materials for SIBs produced by SP will also be discussed. Finally, the powerfulness and limitation along with future research efforts of SP on preparing electrode materials are concisely provided. Given current worldwide interests on LIBs and SIBs, we hope this review will greatly stimulate the collaborative efforts among different communities to optimize existing approaches and to develop innovative processes for preparing electrode materials.

Thumbnail image of graphical abstract

Spray pyrolysis, which is an industrially-viable synthetic approach, has been widely used to synthesize advanced electrode materials for Li-ion and Na-ion batteries. A myriad of electrode materials prepared by spray pyrolysis are summarized and discussed from the perspective of their unique structures generated by spray pyrolysis.

06 Aug 13:23

Combination of solid state NMR and DFT calculation to elucidate the state of sodium in hard carbon electrodes

J. Mater. Chem. A, 2016, 4,13183-13193
DOI: 10.1039/C6TA04273B, Paper
Ryohei Morita, Kazuma Gotoh, Mika Fukunishi, Kei Kubota, Shinichi Komaba, Naoto Nishimura, Takashi Yumura, Kenzo Deguchi, Shinobu Ohki, Tadashi Shimizu, Hiroyuki Ishida
We examined the state of sodium electrochemically inserted in HC prepared at 700-2000 [degree]C using solid state Na magic angle spinning (MAS) NMR and multiple quantum (MQ) MAS NMR.
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