Shin Jeongyim, Yang Junghoon, Sergey Chernov, Song Min-Sang, Kang Yong-Mook
Department of Energy and Materials Engineering Dongguk University Seoul 100-715 Republic of Korea.
Energy Material Lab Material Research Center Samsung Advanced Institute of Technology Samsung Electronics 130 Samsung-ro Yeongtong-gu, Suwon-si Gyeonggi-do 16678 Republic of Korea.
Adv Sci (Weinh). 2017 May 12;4(9):1700128. doi: 10.1002/advs.201700128. eCollection 2017 Sep.
Fast lithium ion and electron transport inside electrode materials are essential to realize its superb electrochemical performances for lithium rechargeable batteries. Herein, a distinctive structure of cathode material is proposed, which can simultaneously satisfy these requirements. Nanosized LiV(PO) (LVP) particles can be successfully grown up on the carbon nanofiber via electrospinning method followed by a controlled heat-treatment. Herein, LVP particles are anchored onto the surface of carbon nanofiber, and with this growing process, the size of LVP particles as well as the thickness of carbon nanofiber can be regulated together. The morphological features of this composite structure enable not only direct contact between electrolytes and LVP particles that can enhance lithium ion diffusivity, but also fast electron transport through 1D carbon network along nanofibers simultaneously. Finally, it is demonstrated that this unique structure is an ideal one to realize high electron transport and ion diffusivity together, which are essential for enhancing the electrochemical performances of electrode materials.
电极材料内部快速的锂离子和电子传输对于实现其在锂可充电电池中的卓越电化学性能至关重要。在此，提出了一种独特的正极材料结构，其能够同时满足这些要求。通过静电纺丝法随后进行可控热处理，纳米尺寸的LiV(PO)（LVP）颗粒能够成功生长在碳纳米纤维上。在此，LVP颗粒锚定在碳纳米纤维表面，并且在这个生长过程中，LVP颗粒的尺寸以及碳纳米纤维的厚度可以同时得到调控。这种复合结构的形态特征不仅使电解质与LVP颗粒之间能够直接接触以增强锂离子扩散率，而且还能同时使电子沿纳米纤维通过一维碳网络快速传输。最后，证明了这种独特结构是一种能够同时实现高电子传输和离子扩散率的理想结构，而这对于提高电极材料的电化学性能至关重要。
