High-Performance Dual-Ion Battery Based on a Layered Tin Disulfide Anode

Abstract

Energy issues have attracted great concern worldwide. Developing new energy has been the main choice, and the exploitation of the electrochemical energy storage devices plays an important role. Herein, a high-performance dual-ion battery system is proposed, which consists of a graphite cathode and SnS 2 anode, with a high-concentration lithium salt electrolyte (4 M LiTFSI). The benefits from the typical sandwich-like layer structure of SnS 2 are as follows: the highest discharge specific capacity of the battery could reach 130.0 mA h g −1 at a current density of 100 mA g −1 , and even under an ultra-high current density of 2000 mA g −1 , the highest capacity of 66.3 mA h g −1 is still achieved, with an outstanding capacity retention over 100% after 1000 cycles. Inspiringly, this system delivers an excellent low self-discharge of 1.19%/h, surpassing most of the reported dual-ion batteries. In addition, the working mechanism and structural stability are also investigated by X-ray diffraction and Raman spectra, indicating a good reversibility. These results reveal that this graphite/SnS 2 dualion battery system could provide a promising alternative for a future high-performance energy storage device.

N‐Doped Carbon‐Coated Mixed‐Phase SnS–SnS2 Anode with Carbon Nanofibers Skeleton for Improving Dual‐Ion Battery in Concentrated Electrolyte

“…It could be clearly seen that the battery at 4.0 V shows the most outstanding cycle stability with a high Coulombic efficiency near 100%, indicating that 4.0 V could be the optimum upper cutoff voltage for the full battery system, far beyond the 3.6 V of pure SnS 2 in our previous work. [38] A comparison of the performances of the batteries based on the pristine SnS 2 and (SnS-SnS 2 )-NC-CF was conducted, which was coordinated graphite cathode and tested in an electrochemical window of 1.0-4.0 V, and the results are as shown in Figure 4a. Obviously, a long charge plateau emerges at around 3.2 V in the first cycle charge-discharge curve of the battery based on the pure SnS 2 anode, leading to an ultrahigh chargespecific capacity of 660.3 mAh g À1 .…”

“…Besides, several new diffraction peaks appear around 20°, suggesting the formation of the Li-Sn alloy and Li-SnS 2 compounds due to the intercalation of Li þ . [24,38] After the discharging process, the new peaks disappear along with the deinsertion of Li þ , and the other peaks gradually recover to the pristine states, revealing a good reversibility. Furthermore, Figure 7d shows the Raman spectra of the (SnS-SnS 2 )-NC-CF anode at different states, and owing to the abundant carbon (CFs, N-doped carbon and acetylene black), A1g (311 cm À1 ) of the SnS 2 is not obvious.…”

“…It could be clearly seen that the battery at 4.0 V shows the most outstanding cycle stability with a high Coulombic efficiency near 100%, indicating that 4.0 V could be the optimum upper cutoff voltage for the full battery system, far beyond the 3.6 V of pure SnS 2 in our previous work. [ 38 ]…”

Spreading the Landscape of Dual Ion Batteries: from Electrode to Electrolyte

“…The self-discharge rate (1.19 % h À 1 ) of the DIB based on SnS 2 anode is better than most DIBs. [145] Our team combined Co 3 O 4 /carbon fiber paper (CFP), [98] a structure that shortens the pathway for ion transport and facilitates electrolyte infiltration. The electrode obtained a capacity of around 530 mAh g À 1 at 0.2 A g À 1 , with a retention rate of over 90 % after 40 cycles.…”

Evaluation of Various Offline and Online ECM Parameter Identification Methods of Lithium-Ion Batteries in Underwater Vehicles

“…Underwater vehicles are a powerful tool that can promote the development of oceanic economy and military operations. With the advent of high-performance lithium-ion batteries, − electric power has gradually become the most popular form of propulsion for underwater vehicles, which can reduce noise, weaken trails, and increase depth . The state of charge (SOC) reflects the current available capacity of battery, which is a critical indicator in the battery management system (BMS) .…”