A Study on the Nanostructural Evolution of Bi/C Anode Materials during Their First Charge/Discharge Processes

Author:

Zhao Mengyuan1,Cheng Weidong1,Wang Xin12,Liu Huanyan12,Chen Xiang1,Wang Chaohui1,You Yuan1,Wu Zhaojun3,Wang Bing4,Wu Zhonghua2,Xing Xueqing2ORCID

Affiliation:

1. College of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, China

2. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

3. Department of Practice Teaching and Equipment Management, Qiqihar University, Qiqihar 161006, China

4. CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China

Abstract

As a candidate anode material for Li-ion batteries, Bi-based materials have attracted extensive attention from researchers due to their high specific capacity, environmental friendliness, and simple synthesis methods. However, Bi-based anode materials are prone to causing large volume changes during charging and discharging processes, and the effect of these changes on lithium storage performance is still unclear. This work introduces that Bi/C nanocomposites are prepared by the Bi-based MOF precursor calcination method, and that the Bi/C nanocomposite maintains a high specific capacity (931.6 mAh g−1) with good multiplicative performance after 100 cycles at a current density of 100 mA g−1. The structural evolution of Bi/C anode material during the first cycle of charging and discharging is investigated using in situ synchrotron radiation SAXS. The SAXS results indicate that the multistage scatterers of Bi/C composite, used as an anode material during the first lithiation, can be classified into mesopores, interspaces, and Bi nanoparticles. The different nanostructure evolutions of three types of Bi nanoparticles were observed. It is believed that this result will help to further understand the complex reaction mechanism of Bi-based anode materials in Li-ion batteries.

Funder

National Natural Science Foundation of China

Innovation Program of the Institute of High Energy Physics, CAS

National Key R&D Program of China

Nature Science Foundation of Heilongjiang Province

Project of Education Department of Heilongjiang Province

Publisher

MDPI AG

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