Observation of electrode lithiation process and interfacial evolution in lithium ion battery by in-situ TEM technique Speaker: Xi Chen Advisor: Dr. Junjie Niu Department of Materials, College of Engineering & Applied Science

Contents 1 2 3 4 5 Background of in-situ TEM Motivation for electrode lithiation process observation 2 Nano Factory In-situ Holder 3 4 In-situ TEM Observation of Sn/C Hybrid Anodes 5 In-situ TEM Observation of 3D Sphere-Caged Sn/C Anodes

Background of in-situ TEM In-situ TEM holder with experimental setup TEM In-situ heating experiment In-situ gas based experiment Morphology In-situ piezotube and bias experiment In-situ liquid cell experiment Crystal structure Element distribution

Motivation for electrode lithiation process observation -10V to 10V Piezo tube Li Li2O/Solid Electrolyte W Wire Sample Conductive Epoxy Applied bias

Motivation for electrode lithiation process observation Next generation Lithium ion battery anodes Challenge 1: Volume expansion induced active materials pulverization Challenge 2: Unstable SEI layer built outside of active materials Y. Sun, N. Liu, Y. Cui, Nat. Energy 2016, 16071

3D Sphere-Caged Sn/C Sample information Sn/C anodes for in-situ observation 3D Sphere-Caged Sn/C Sample information Sn/C Hybrid Nano Composites

In-situ TEM Observation of 3D Sphere-Caged Sn/C Anodes Liu, Jinyun ; Chen, Xi ; Kim, Jinwoo ; Zheng, Qiye ; Ning, Hailong ; Sun, Pengcheng ; Huang, Xingjiu ; Liu, Jinhuai ; Niu, Junjie ; Braun, Paul V, Nano letters, 13 July 2016, Vol.16(7), pp.4501-7

In-situ TEM Observation of Sn/C Hybrid Anodes Liu, Jinyun ; Lin, Xirong ; Chen, Xi ; Shen, Zihan ; Chi, Miaofang ; Niu, Junjie ; Zhang, Huigang ; Huang, Jiarui ; Li, Jinjin, Chemical Communications, 2017, Vol.53(98), pp.13125-13128

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