Eliminating water hazards and regulating electrode-electrolyte interfaces by multifunctional sacrificial electrolyte additives for long-life lithium metal batteries

Yang, Borui; Hu, Anjun; Li, Ting; Li, Kun; Li, Yuanjian; Jiang, Jingyun; Xiao, Zhubing; Seh, Zhi Wei; Long, Jianping

doi:10.1016/j.ensm.2024.103512

“…The evolution of reliable energy storage systems (ESSs) has become a pivotal task in constructing a sustainable world. At present, lithium-ion batteries (LIBs) are widely used as the main ESSs, − but they still face significant challenges such as flammability and high cost. − Aqueous zinc-ion batteries (AZIBs) possess significant advantages in terms of enhanced safety, low cost, good environmental compatibility, and easy manufacture, and have broad application prospects in the field of accumulation energy. , However, the development of AZIBs has been fraught with difficulties, mainly due to irregular dendrite growth and corrosion reactions. − On one hand, aqueous electrolyte corrodes Zn metal, leading to a disordered electric field distribution and the uncontrolled growth of sharp Zn dendrites that often pierce the separator and cause battery short circuits leading to electronic device failure . On the other hand, corrosion in the electrolyte will continue to consume the Zn anode and aqueous electrolyte, which can lead to premature failure of prepared AZIBs due to electrolyte depletion.…”

Section: Introductionmentioning

confidence: 99%

Trace Amount of High-Concentration Electrolyte for High-Performance Aqueous Zn Metal Anodes

Tu,

Ma,

Yang

et al. 2024

Energy Fuels

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In recent years, the demand for energy storage equipment has been increasing, and aqueous zinc ion batteries with high safety and environmental protection have attracted widespread attention. However, their lifespan remains limited due to severe side reactions and the growth of zinc dendrites. Up to now, a lot of work has been done on electrolyte additives, but the comprehensive influence of the electrolyte concentration and volume on aqueous zinc ion batteries has received less attention. In the process of battery assembly, too much electrolyte will lead to low energy density of the whole battery, so it is necessary to explore trace electrolytes. In this study, the corrosion of the zinc anode and the growth of zinc dendrites were effectively inhibited by using 30 μL of trace high-concentration electrolyte. The results showed that the symmetric cell with 3 M ZnSO 4 electrolyte exhibited a stable cycle for 3000 h at 1 mA cm −2 . The activation energy of the zinc deposition process was reduced. The reversibility of zinc electroplating/stripping was improved, and the average Coulombic efficiency of Zn|3 M ZnSO 4 |Cu half cell was ∼99.9% after 800 cycles at 5 mA cm −2 . Additionally, the specific capacity of the Zn || activated carbon capacitor was 93.2 mAh g −1 after 6000 cycles at 5 A g −1 . This indicates that trace high-concentration electrolytes can effectively improve the performance of aqueous zinc ion energy storage devices. At present, the evaluation of electrochemical performance comparison of zinc metal anode is inconsistent. The investigation of trace electrolyte concentration in this study is instrumental in establishing a robust anode assessment criterion for zinc ion batteries and facilitating the rapid advancement of zinc ion battery technology.

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Eliminating Hydrogen Fluoride through Piperidine‐Doped Separators for Stable Li Metal Batteries with Nickel‐Rich Cathodes

Ding,

Chen,

Sheng

et al. 2024

Angewandte Chemie

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Hydrofluoric acid (HF)‐induced electrode and interfacial structure degeneration poses a significant challenge for high‐voltage lithium metal batteries (LMBs). To address this issue, we propose a separator strategy that involves decorating a regular polyethylene (PE) separator with molecular sieves (TW) impregnated with piperidine (PI). The porous structure of the TW serves as a reaction chamber for PI and HF. As a result, the HF content in the controlled electrolyte with 500 ppm H2O (ELE‐500) is notably reduced when using TW@PI‐PE separators, thereby shielding nickel‐rich cathodes from HF etching. Simultaneously, due to the hydrolysis of Li salts, and the inertness of PI towards H2O, a uniform lithium fluoride (LiF)‐rich solid electrolyte interphase can form on the Li metal anode, further mitigating dendrite formation. The lifespan of the symmetric Li cell using the TW@PI‐PE separator is doubled in ELE‐500, exhibiting stable 500‐hour cycles at 3 mA cm−2 and 3 mAh cm−2. Additionally, with the effective limitation of transition metal (TM) dissolution, the 4.6‐V LMBs employing a LiNi0.8Co0.1Mn0.1O2 cathode maintain an 81 % capacity retention over 100 cycles, even in ELE‐1000. The innovative TW@PI system presented here offers a fresh perspective for future research aimed at eliminating HF in LMBs.

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Eliminating Hydrogen Fluoride through Piperidine‐Doped Separators for Stable Li Metal Batteries with Nickel‐Rich Cathodes

Ding,

Chen,

Sheng

et al. 2024

Angew Chem Int Ed

0

View full text Add to dashboard Cite

Hydrofluoric acid (HF)‐induced electrode and interfacial structure degeneration poses a significant challenge for high‐voltage lithium metal batteries (LMBs). To address this issue, we propose a separator strategy that involves decorating a regular polyethylene (PE) separator with molecular sieves (TW) impregnated with piperidine (PI). The porous structure of the TW serves as a reaction chamber for PI and HF. As a result, the HF content in the controlled electrolyte with 500 ppm H2O (ELE‐500) is notably reduced when using TW@PI‐PE separators, thereby shielding nickel‐rich cathodes from HF etching. Simultaneously, due to the hydrolysis of Li salts, and the inertness of PI towards H2O, a uniform lithium fluoride (LiF)‐rich solid electrolyte interphase can form on the Li metal anode, further mitigating dendrite formation. The lifespan of the symmetric Li cell using the TW@PI‐PE separator is doubled in ELE‐500, exhibiting stable 500‐hour cycles at 3 mA cm−2 and 3 mAh cm−2. Additionally, with the effective limitation of transition metal (TM) dissolution, the 4.6‐V LMBs employing a LiNi0.8Co0.1Mn0.1O2 cathode maintain an 81 % capacity retention over 100 cycles, even in ELE‐1000. The innovative TW@PI system presented here offers a fresh perspective for future research aimed at eliminating HF in LMBs.

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Eliminating water hazards and regulating electrode-electrolyte interfaces by multifunctional sacrificial electrolyte additives for long-life lithium metal batteries

Cited by 10 publications

References 45 publications

Trace Amount of High-Concentration Electrolyte for High-Performance Aqueous Zn Metal Anodes

Trace Amount of High-Concentration Electrolyte for High-Performance Aqueous Zn Metal Anodes

Eliminating Hydrogen Fluoride through Piperidine‐Doped Separators for Stable Li Metal Batteries with Nickel‐Rich Cathodes

Eliminating Hydrogen Fluoride through Piperidine‐Doped Separators for Stable Li Metal Batteries with Nickel‐Rich Cathodes

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