Li2CO3 induced stable SEI formation: An efficient strategy to boost reversibility and cyclability of Li storage in SnO2 anodes

Li2CO3 induced stable SEI formation: An efficient strategy to boost reversibility and cyclability of Li storage in SnO2 anodes

作者:Wen, G (Wen, Gang)[ 1 ] ; Tan, L (Tan, Liang)[ 1 ] ; Lan, XX (Lan, Xuexia)[ 1 ] ; Zhang, HY (Zhang, Hanyin)[ 1 ] ; Hu, RZ (Hu, Renzong)[ 1 ] ; Yuan, B (Yuan, Bin)[ 1 ] ; Liu, J (Liu, Jun)[ 1 ] ; Zhu, M (Zhu, Min)[ 1 ]

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SCIENCE CHINA-MATERIALS

DOI: 10.1007/s40843-021-1665-1

Early access icon在线发表日期: MAY 2021

文献类型:Article; Early Access

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摘要

The unstable interfaces between a SnO2 anode and an electrolyte in a Li-ion battery dramatically impair the reversibility and cycling stability of lithiation and delithiation, resulting in low roundtrip Coulombic efficiency (CE) and fast capacity decay of SnO2-based anode materials. Herein, a simple strategy of modifying the solid electrolyte interphase (SEI) is developed to enhance the interfacial stability and lithium storage reversibility of SnO2 by compositing it with graphite (G) and an inorganic component of the SEI, such as Li2CO3 or LiF, which results in the SnO2-Li2CO3/G and SnO2LiF/G composite anodes with high CEs, large capacities and long cycle lives. Specifically, the SnO2-Li2CO3/G composite anode exhibits an average initial CE of 79.6%, a stable reversible capacity of 927.5 mA h g at a current rate of 0.2 A g(-1), and a charge capacity over 1200 mA h g(-1) with a CE >99% after 900 cycles at a higher current rate of 1 A g(-1). It is revealed that Li2CO3 induces the formation of a dense and stable SEI on SnO2 grains and inhibits the coarsening of nanosized Sn particles generated from the dealloying reaction in the SnO2-Li2CO3/G electrode. Moreover, the CE and cycling stability of other alloying-type (Si) and conversion reaction (MnO2 and Fe3O4) anodes can also be greatly promoted by simply milling with Li2CO3. Thus, a universal and simple strategy is developed to achieve highly reversible and stable electrodes for large-capacity lithium storage.

关键词

作者关键词:tin oxide; lithium carbonate; solid electrolyte inter-phase; lithium-ion battery; Coulombic efficiency

KeyWords Plus:ELECTROLYTE INTERPHASE SEI; HIGH-RATE-CAPABILITY; LITHIUM-ION; CONVERSION REACTION; CRITICAL SIZE; LONG-LIFE; BATTERY; CAPACITY; PERFORMANCE; GRAPHENE

作者信息

通讯作者地址:

South China University of Technology South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.

通讯作者地址: Hu, RZ; Zhu, M (通讯作者)

显示更多       South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China.

地址:

显示更多       [ 1 ]‎ South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510640, Peoples R China

电子邮件地址:msrenzonghu@scut.edu.cn; memzhu@scut.edu.cn

基金资助致谢

基金资助机构显示详情       授权号

National Natural Science Foundation of China (NSFC)

52071144

51621001

51822104

51831009

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出版商

SCIENCE PRESS, 16 DONGHUANGCHENGGEN NORTH ST, BEIJING 100717, PEOPLES R CHINA

期刊信息

Impact Factor (影响因子): Journal Citation Reports

类别 / 分类

研究方向:Materials Science

Web of Science 类别:Materials Science, Multidisciplinary