Abstract:Spinel lithium manganese oxide (LiMn 2 O 4) based Li-ion battery (LIB) is attractive for hybrid/full electric vehicles because of its abundant resources and easy preparation. However, operation under an elevated temperature could cause severe capacity fading of the spinel cathodes. In this work, 1, 3-propane sultone (PS) is investigated as an electrolyte additive for improving the cyclability of the LiMn 2 O 4 /graphite LIB at elevated temperature. The charge and discharge measurement proves that PS can signif… Show more
“…The oxidation current starts to increase resulting from the first decomposition of PS at 4.3 V (Fig. 1c), 43 which proves that PS gives priority to the formation of a CEI on the cathode surface. The blank electrolyte has a higher reduction current and widens the range of potentials at 1.3 V and 0.7 V, as shown in Fig.…”
Lithium metal batteries (LMBs) with Ni-rich cathode materials providing ultra-high energy density (~ 500 Wh kg-1) are expected to be the next generation of batteries. However, high-voltage LMBs exhibit inferior...
“…The oxidation current starts to increase resulting from the first decomposition of PS at 4.3 V (Fig. 1c), 43 which proves that PS gives priority to the formation of a CEI on the cathode surface. The blank electrolyte has a higher reduction current and widens the range of potentials at 1.3 V and 0.7 V, as shown in Fig.…”
Lithium metal batteries (LMBs) with Ni-rich cathode materials providing ultra-high energy density (~ 500 Wh kg-1) are expected to be the next generation of batteries. However, high-voltage LMBs exhibit inferior...
“…[61] Moreover, PS also improves the cycling performance of Li + batteries by modifying the SEI film, effectively preventing the structural damage of the anode and cathode, and inhibiting electrolyte decomposition. [62] The improved capacity retention of the battery due to PS can be attributed to its participation in the formation of passivation layer, which prevents dissolution of metal from the cathode material. [63] Li Weishan's [64] research group chose 3-sulfolene (3SF) as an additive to suppress the reduction and co-intercalation of PC in PC-based electrolytes, greatly improving the performance of graphite/Li batteries, with better results than PES.…”
The improvement of the safety, specific energy, cycle life and the cost reduction of Li‐ion batteries are hot research topics. Now, in the pursuit of high energy density, the employed high‐energy‐density cathode/anode materials and the increased operation voltage challenge the prevalent electrolyte formula, like the existing ester and ether electrolytes cannot withstand the high‐voltage operation and high‐capacity anode such as lithium (Li), silicon (Si) and silicon‐graphite (Si−C) composite anode. It is recognized that stable electrolyte‐electrode interfaces can avoid the electrolytes side reactions and protect the electrode materials. Up to now, various additives have been developed to modify the electrode‐electrolyte interfaces, such as famous 4‐fluoroethylene carbonate, vinylene carbonate and lithium nitrate, and the LIBs and lithium metal batteries (LMBs) performances have been improved greatly. However, the lifespan of the higher‐energy‐density batteries with Li/Si/Si−C anode and high‐nickel layer oxides cathode materials cannot meet the request due to the lack of ideal electrolyte formula. In this review, we present a comprehensive and in‐depth overview on the electrolyte additives, especially focused on multifunctional additives, the reaction mechanisms of various additives and fundamental design. Finally, novel insights, promising directions and potential solutions for the multifunctional electrolyte additives are proposed to motivate high‐energy‐density Li battery chemistries.
“…Kamanura và cộng sự đã nghiên cứu lớp thụ động, sản phẩm của quá trình ăn mòn nhôm trong điện giải, có một lượng nhỏ HF và LiTFSI là AlOF và AlF 3 cho thấy lớp thụ động này không ổn định, đã tan sau nhiều chu kì phóng sạc, dẫn đến đế nhôm tiếp tục bị ăn mòn. Đối với hệ LiBF 4 , hệ điện giải có độ dẫn kém do hiện tượng dòng thứ cấp (second-rate) khiến cho điện giải tiếp tục bị oxy hóa ở các chu kì phóng sạc sau8,13 . Như vậy, vấn đề chính của cả hệ điện giải chứa muối LiTFSI và LiBF 4 là các phản ứng phụ trực tiếp với hệ điện giải xảy ra liên tục trong quá trình hoạt động của pin dẫn đến dung lượng của pin giảm rất nhanh (Hình 5).…”
LiMn2O4 spinel structure was considered as the cathode material to replace LiCoO2 for high voltage lithium-ion batteries, however, its main drawback was poor cycling due to dissolution of manganese and structural instability. One of the effective solutions is to find out a suitable electrolyte composition and additive to reduce the manganese dissolution and to prevent the side reaction between the electrode material and the electrolyte. In this study, we investigated the impact of using fluoroethylene carbonate (FEC), vinyl carbonate (VC), lithium bis(oxalato)borate (LiBOB) as additives for the electrolyte of 1 M LiPF6/EC:DMC (1:1) and different salt such as: LiBF4, LiClO4 and LiTFSI for commercial carbonate solvent of EC:DMC (1:1) on the improvement of the cyclic stability and electrochemical performance of LiMn2O4 electrodes. The results showed that the addition of FEC did not affect the initial capacity but increased significantly the cycle stability of the material. In particular, the discharge capacity maintained 91% of initial value after 20 cycles in the electrolytes containing 2 %wt and 3 %wt FEC, respectively. However, further increase of FEC content induced the polarization of the charge discharge curves as well as the increase of the electrode - electrolyte interface resistance which were responsible for the cycling performance decline. Among tested salts, LiClO4 was the best electrolytic one for EC:DMC (1:1) based-electrolyte that enhanced the initial discharge capacity roughly 20 mAh/g. In addition, preliminary results on the full-cell of graphite||LMO achieved the discharge capacity of 87.09 mAh/g (at C/5) and 73.52 mAh/g (at C/2) which is about 66.99 % the initial discharge capacity obtained at C/5 of the half-cell LMO|Li).
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