journal article·2023-04-26

Accumulated Lattice Strain as an Intrinsic Trigger for the First-Cycle Voltage Decay in Li-Rich 3d Layered Oxides

Suning Wang, Tian Zhao, Jinniu Chen, Alexander Missyul, Laura Simonelli, Laijun Liu, Fujun Li, Xiangyang Kong, Weibo Hua

ACS Applied Materials & Interfaces· Volume 15· Issue 16
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Abstract

Li- and Mn-rich layered oxides (LMLOs) are promising cathode materials for Li-ion batteries (LIBs) owing to their high discharge capacity of above 250 mA h g –1 . A high voltage plateau related to the oxidation of lattice oxygen appears upon the first charge, but it cannot be recovered during discharge, resulting in the so-called voltage decay. Disappearance of the honeycomb superstructure of the layered structure at a slow C-rate (e.g., 0.1 C) has been proposed to cause the first-cycle voltage decay. By comparing the structural evolution of Li[Li 0.2 Ni 0.2 Mn 0.6 ]O 2 (LLNMO) at various current densities, the operando synchrotron-based X-ray diffraction results show that the lattice strain in bulk LLNMO is continuously increased over cycling, resulting in the first-cycle voltage loss upon Li-ion insertion. Unlike the LLNMO, the accumulated average lattice strain of LiNi 0.8 Co 0.1 Mn 0.1 O 2 (NCM811) and LiNi 0.6 Co 0.2 Mn 0.2 O 2 (NCM622) from the open-circuit voltage to 4.8 V could be released on discharge. These findings help to gain a deep understanding of the voltage decay in LMLOs.
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Research context

OpenAlex topics: Advancements in Battery Materials · Semiconductor materials and devices · Advanced Memory and Neural Computing

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

School of Chemical Engineering and Technology, Xi’an Jiaotong University, No.28, West Xianning Road, Xi’an, Shaanxi 710049, China

Institute for Applied Materials (IAM), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany

College of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, China

CELLS-ALBA Synchrotron, Cerdanyola del Valles, Barcelona E-08290, Spain

Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Nankai University, Tianjin 300071, China

School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, 610065 Chengdu, China

Funding

Xi???an Jiaotong University · Deutsche Forschungsgemeinschaft · National Natural Science Foundation of China · Natural Science Foundation of Guangxi Province · Guangxi Science and Technology Base and Talents Special Project · Qinchuangyuan Innovative Talent Project

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