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. 2019 Sep 18;9(51):29549-29555.
doi: 10.1039/c9ra05055h.

Flower-like Bi2S3 nanostructures as highly efficient anodes for all-solid-state lithium-ion batteries

Pooja Kumari  1   2 , Kamlendra Awasthi  2 , Shivani Agarwal  3 , Takayuki Ichikawa  1   4 , Manoj Kumar  2 , Ankur Jain  4
Affiliations

Flower-like Bi2S3 nanostructures as highly efficient anodes for all-solid-state lithium-ion batteries

Pooja Kumari et al. RSC Adv. .

Abstract

Herein, we introduce the detailed electrochemical reaction mechanism of Bi2S3 (bulk as well as nanostructure) as a highly efficient anode material with Li-ions in an all-solid-state Li-ion battery (LIB). Flower-like Bi2S3 nanostructures were synthesized by a hydrothermal method and were used as an anode material in a LIB with LiBH4 as a solid electrolyte. The X-ray diffraction (XRD) pattern verified the formation of Bi2S3 nanostructures, which belongs to the orthorhombic crystal system (JCPDS no. 00-006-0333) with the Pbnm space group. Morphological studies confirmed the flower-like structure of the obtained product assembled from nanorods with the length and diameter in the range of 150-400 nm and 10-150 nm respectively. The electrochemical galvanostatic charge-discharge profile of these nanostructures demonstrates exciting results with a high discharge and charge capacity of 685 mA h g-1 & 494 mA h g-1 respectively at 125 °C. The discharge and charge capacities were observed as 375 mA h g-1 and 352 mA h g-1 after 50 cycles (with 94% coulombic efficiency), which are much better than the cells having bulk Bi2S3 as the anode material.

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Conflict of interest statement

There are no conflicts to declare.

Figures

Fig. 1
Fig. 1. (A) XRD pattern of as prepared Bi2S3 nanoflowers (B) FE-SEM & TEM images of Bi2S3 nanoflowers (a, b) HRTEM & SAED images of nanoflowers (c & d).
Fig. 2
Fig. 2. First galvanostatic discharge–charge profile of the nano Bi2S3–LiBH4 composite anode material in the voltage range of 0.2–2.5 V at 125 °C with the rate of 0.1C.
Fig. 3
Fig. 3. Cyclic performance of the nano Bi2S3–LiBH4 composite anode material in the voltage range of 0.2–1.5 V at 125 °C with 0.1C.
Fig. 4
Fig. 4. (a) The first galvanostatic discharge–charge curves for bulk Bi2S3–LiBH4 composite anode material in the voltage range of 0.2–2.5 V at 0.1C. (b) Ex situ XRD profiles of Bi2S3–LiBH4 composite anode material evolution upon the first electrochemical discharge–charge process at different stages.
Fig. 5
Fig. 5. Cyclic voltammograms of Bi2S3 (bulk & nanoflowers)–LiBH4 composite anode material scanned at 0.1 mV s−1.
Fig. 6
Fig. 6. (a) Cyclic performance of the bulk Bi2S3–LiBH4 composite anode material in the voltage range of 0.2–1.5 V at 125 °C with 0.1C. (b) Cyclic stability (capacity vs. no. of cycle) of commercial bulk Bi2S3 and Bi2S3 nanoflowers.
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