| 1. |
- Du, Hao, et al.
(författare)
-
Side reactions/changes in lithium-ion batteries : mechanisms and strategies for creating safer and better batteries
- 2024
-
Ingår i: Advanced Materials. - : John Wiley & Sons. - 0935-9648 .- 1521-4095. ; 36:29
-
Forskningsöversikt (refereegranskat)abstract
- Lithium-ion batteries (LIBs), in which lithium ions function as charge carriers, are considered the most competitive energy storage devices due to their high energy and power density. However, battery materials, especially with high capacity undergo side reactions and changes that result in capacity decay and safety issues. A deep understanding of the reactions that cause changes in the battery's internal components and the mechanisms of those reactions is needed to build safer and better batteries. This review focuses on the processes of battery failures, with voltage and temperature as the underlying factors. Voltage-induced failures result from anode interfacial reactions, current collector corrosion, cathode interfacial reactions, overcharge, and overdischarge, while temperature-induced failure mechanisms include SEI decomposition, separator damage, and interfacial reactions between electrodes and electrolytes. The review also presents protective strategies for controlling these reactions. As a result, the reader is offered a comprehensive overview of the safety features and failure mechanisms of various LIB components.
|
|
| 2. |
- Zhao, Yun, et al.
(författare)
-
Rational design of functional binder systems for high-energy lithium-based rechargeable batteries
- 2021
-
Ingår i: Energy Storage Materials. - : Elsevier. - 2405-8289 .- 2405-8297. ; 35, s. 353-377
-
Tidskriftsartikel (refereegranskat)abstract
- Binders, which maintain the structural integrity of electrodes, are critical components of lithium-based rechargeable batteries (LBRBs) that significantly affect battery performances, despite accounting for 2 to 5 wt% (up to 5 wt% but usually 2 wt%) of the entire electrode. Traditional polyvinylidene fluoride (PVDF) binders that interact with electrode components via weak van der Waals forces are effective in conventional LBRB systems (graphite/LiCoO2, etc.). However, its stable fluorinated structures limit the potential for further functionalization and inhibit strong interactions towards external substances. Consequently, they are unsuitable for next-generation battery systems with high energy density. There is thus a need for new functional binders with facile features compatible with novel electrode materials and chemistries. Here in this review we consider the strategies for rationally designing these functional binders. On the basis of fundamental understandings of the issues for high-energy electrode materials, we have summarized seven desired functions that binders should possess depending on the target electrodes where the binders will be applied. Then a variety of leading-edge functional binders are reviewed to show how their chemical structures realize these above functions and how the employment of these binders affects the cell's electrochemical performances. Finally the corresponding design strategies are therefore proposed, and future research opportunities as well as challenges relating to LBRB binders are outlined.
|
|
| 3. |
- Wang, Xianshu, et al.
(författare)
-
Non-solvating fluorosulfonyl carboxylate enables temperature-tolerant lithium metal batteries
- 2023
-
Ingår i: Journal of Energy Chemistry. - : Elsevier. - 2095-4956 .- 2096-885X. ; 82, s. 287-295
-
Tidskriftsartikel (refereegranskat)abstract
- Advanced electrolyte engineering is an important strategy for developing high-efficacy lithium (Li) metal batteries (LMBs). Unfortunately, the current electrolytes limit the scope for creating batteries that perform well over temperature ranges. Here, we present a new electrolyte design that uses fluorosulfonyl carboxylate as a non-solvating solvent to form difluoroxalate borate (DFOB-) anion-rich solvation sheath, to realize high-performance working of temperature-tolerant LMBs. With this optimized electrolyte, favorable SEI and CEI chemistries on Li metal anode and nickel-rich cathode are achieved, respectively, leading to fast Li+ transfer kinetics, dendrite-free Li deposition and suppressed electrolyte deterioration. Therefore, Li||LiNi0.80Co0.15Al0.05O2 batteries with a thin Li foil (50 μm) show a long-term cycling lifespan over 400 cycles at 1 C and a superior capacity retention of 90% after 200 cycles at 0.5 C under 25 ℃. Moreover, this electrolyte extends the operating temperature from -10 to 30 ℃ and significantly improve the capacity retention and Coulombic efficiency of batteries are improved at high temperature (60 ℃). Fluorosulfonyl carboxylates thus have considerable potential for use in high-performance and all-weather LMBs, which broadens the new exploring of electrolyte design.
|
|
| 4. |
- Wu, Junru, et al.
(författare)
-
Unique tridentate coordination tailored solvation sheath towards highly stable lithium metal batteries
- 2023
-
Ingår i: Advanced Materials. - : Wiley-VCH Verlagsgesellschaft. - 0935-9648 .- 1521-4095. ; 35:38
-
Tidskriftsartikel (refereegranskat)abstract
- Electrolyte optimization by solvent molecule design has been recognized as an effective approach for stabilizing lithium (Li) metal batteries. However, the coordination pattern of Li+ with solvent molecules has been sparsely considered. Here, we report an electrolyte design strategy based on bi/tridentate chelation of Li+ and solvent to tune the solvation structure. As a proof of concept, a novel solvent with multi oxygen coordination sites is demonstrated to facilitate the formation of an anion-aggregated solvation shell, enhancing the interfacial stability and de-solvation kinetics. As a result, the as-developed electrolyte exhibits ultra-stable cycling over 1400 h in symmetric cells with 50 ?m-thin Li foils. When paired with high-loading LiFePO4, full cells maintain 92% capacity over 500 cycles and deliver improved electrochemical performances over a wide temperature range from -10 °C to 60 °C. Furthermore, the concept is validated in a pouch cell (570 mAh), achieving a capacity retention of 99.5% after 100 cycles. This brand-new insight on electrolyte engineering provides guidelines for practical high-performance Li metal batteries. This article is protected by copyright. All rights reserved
|
|
| 5. |
- Zhao, Yun, et al.
(författare)
-
Precise separation of spent lithium-ion cells in water without discharging for recycling
- 2022
-
Ingår i: Energy Storage Materials. - : Elsevier. - 2405-8289 .- 2405-8297. ; 45, s. 1092-1099
-
Tidskriftsartikel (refereegranskat)abstract
- New methods for recycling lithium-ion batteries (LIBs) are needed because traditional recycling methods are based on battery pulverization, which requires pre-treatment of tedious and non-eco-friendly discharging and results in low efficiency and high waste generation in post-treatment. Separating the components of recycled LIB cells followed by reuse or conversion of individual components could minimize material cross-contamination while avoiding excessive consumption of energy and chemicals. However, disposing of charged LIB cells is hazardous due to the high reactivity of lithiated graphite towards cathode materials and air, and the toxicity and flammability of the electrolytes. Here we demonstrate that the disassembly of charged jellyroll LIB cells in water with a single main step reveals no emissions from the cells and near perfect recycling efficiencies that exceed the targets of the US Department of Energy and Batteries Europe. The precise non-destructive mechanical method separates the components from jellyroll cell in water, avoiding both uncontrollable reactions from the anode and burning of the electrolyte, while allowing only a limited fraction of the anode lithium to react with water. Recycling in this way allows the recovery of materials with a value of ∼7.14 $ kg−1 cell, which is higher than that of physical separation (∼5.40 $ kg−1 cell) and much greater than the overall revenue achieved using element extraction methods (<1.00 $ kg−1 cell). The precise separation method could thus facilitate the establishment of a circular economy within the LIB industry and build a strong bridge between academia and the battery recycling industry.
|
|
