A Dry Room-Free High-Energy Density Lithium-ion Batteries Enabled by Impurity Scavenging Separator Membrane

Son, Hye Bin; Shin, Myoungsu; Song, Woo‐Jin; Han, Dong‐Yeob; Choi, Sungho; Cha, Hyungyeon; Nam, Seoha; Cho, Jaephil; Choi, Soo Jung; Yoo, Seungmin; Park, Soo‐Jin

doi:10.1016/j.ensm.2021.01.018

Cited by 30 publications

(25 citation statements)

References 49 publications

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“…As shown in Figure 6d,e, the EIS curve contains two semicircular circles, among which the semicircle in the high‐frequency region represents the resistance of sodium ion migration through the SEI film formed on the Na anode surface ( R f ), and the semicircle in the low‐frequency region reflects the charge transfer resistance at the electrode and electrolyte interface ( R ct ). [ 46,47 ] After 3 cycles, cells assembled with the PE‐HEC‐TiO 2 and cells assembled with the PE‐HEC have smaller R f and R ct , due to the highly efficient ion migration brought by the significantly improved wettability and excellent interfacial contact between the separator and electrodes. However, compared to those equipped with the PE‐HEC and the PE‐HEC‐TiO 2 separator, the cell assembled with the pristine PE separator exhibits the maximum resistance after 3 cycles, which can be attributed to interface incompatibility between separator and electrode triggered by the poor electrolyte affinity of the pristine separator.…”

Section: Resultsmentioning

confidence: 99%

High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries

et al. 2022

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The separator, as an important inner part of the sodium-ion battery (SIB), has a significant impact on the electrochemical performance and security of the battery. However, conventional polyolefin separators are inapplicable for SIBs due to their poor wettability to liquid electrolytes and unsatisfactory heat resistance. To address these problems, a novel polyethylene (PE)-hydroxyethyl cellulose (HEC)-TiO 2 composite separator modified on the PE matrix is proposed and successfully prepared by a multistep synthesis procedure of HEC coating and TiO 2 in situ self-growth, while almost maintaining the initial separator thickness. Compared with conventional PE separators, this composite separator possesses remarkable wettability which benefits from the introduction of a polar HEC-TiO 2 -incorporated coating. Besides, thanks to a significant improvement in wettability, the separator presents high electrolyte uptake of up to 186.5% and an extraordinary ionic conductivity of 0.342 mS cm À1 . As expected, a Na|Na 3 V 2 (PO 4 ) 3 battery with the PE-HEC-TiO 2 separator exhibits a reversible capacity of 99.0 mAh g À1 and a capacity retention of 94.8% after 1000 cycles at 5 C with a steady Coulombic efficiency of nearly 100%. These brilliant performances convincingly make it a promising separator for advanced SIBs with high reversibility, high capacity, and long life.

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Section: Resultsmentioning

confidence: 99%

High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries

et al. 2022

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“…Therefore, the optimal effective strategy is to anchor the moisture (acid)‐absorbing material (e.g., molecular sieve (MS), metal–organic framework, and porous silica) onto the supportive scaffold without blocking the ion pathways. [ 6,13,14 ] In this sense, the thorough considerations of the cation dissolution mitigation in the commercially available electrolytes, self‐discharge alleviation at the elevated temperatures, as well as the reversible structural evolution upon the repetitive cycling are the prerequisites for the interfacial tailoring of the cathode. Meanwhile, the mitigation strategies should conform to the slurry‐coating cell manufacturing without complicated electrode processing.…”

Section: Introductionmentioning

confidence: 99%

Boosting the Temperature Adaptability of Lithium Metal Batteries via a Moisture/Acid‐Purified, Ion‐Diffusion Accelerated Separator

Zhang

Liu

Gan

et al. 2022

Advanced Energy Materials

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solutions, explorative studies of the electro-redox couples, with the concurrent high retrievable capacity, enlarged nominal voltage gap, and rapid reaction kinetics, hold the key to promote the energy-dense battery construction at the extreme power output. [1] For the lithium ion batteries, the energy densities of traditional formats (LiCoO 2 /LiFePO 4 cathodes and graphite anodes) have approached their theoretical limits. [2] Alternatively, the unit cell prototyping of the high-capacity Li metal anode with the nickel-rich cathode can achieve the enhanced level of energy densities at the device level. [3,4] When soaking this electrode couples in the conventional carbonate-based electrolytes, however, the Fermi-energy incompatibility at the multiscale interface would cause the uncontrollable dendrite growth on the metallic foil and cathode structure collapse upon the high-voltage cycling. [5] Therefore, the reliable operation of the energy-dense battery necessitates the harmony balance of the enlarged voltage gap and the interfacial stability at multiple scales, yet still remains challenging.As the most attractive cathode type of the practical relevance, nickel-rich (Ni content >0.8) layered oxides exhibit the merits of the large specific capacity (>200 mAh g −1 ), environmental benignity and relative lower cost as compared to the LiCoO 2 cathode. Despite of the dominant nickel occupancy in the layered oxides for elevating the Li storage sites, the increased nickel ratio adversely deteriorates the cycle performance. The transition metal (TM) layer of the oxide structure at the highvoltage charged states would oxidize the carbonate solvents in the presence of moisture, leading to serious self-discharge rates upon the high-temperature storage. [6] Additionally, the hydrofluoric acid (HF) formed by the decomposition of the lithium hexafluorophosphate (LiPF 6 ) salt aggravates the TM ions (Co 2+ , Ni 2+ , and Mn 2+ ) dissolution and structural collapse of the layered cathode, meanwhile the TM species would deposit on the anode surface and degrade the solid electrolyte interface (SEI). [7] So far, a plethora of mitigation strategies were implemented to insulate the direct contact of the oxide particles with the electrolyte, for instance the exquisite coatings with The reliable operation of Li metal batteries suffers from cathode collapse due to high-voltage cycling, interfacial reactivity of the Li deposits, self-discharge at the elevated temperatures, as well as the power output deterioration in low-temperature scenarios. In contrast to the individual electrode optimization, herein, a hetero-layered separator with an asymmetric functional coating on polyethylene is proposed in response to the aforementioned issues: On the face-to-cathode side, the hybrid layer of the molecular sieve and sulfonated melamine formaldehyde can scavenge the hydrofluoric acid and moisture residues from the carbonate electrolyte, maintaining the cathode robustness in both the high-voltage cycling or high-temperature storage scenarios; while...

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“…LIBs have become the standard power supply for mobile electronic devices, such as mobile phones and laptops, and have begun to be applied to light electric vehicles and hybrid electric vehicles. Commercial LIBs have significant potential safety hazards due to the use of polyolefin separators with poor thermal stability and flammable and volatile carbonate solvents [ 1 , 2 , 3 , 4 , 5 ]. Furthermore, the lack of polar groups reduces the wettability and liquid absorption of the polyolefin separator and the existence of crystal structures also causes ion transport difficulties that reduce conductivity.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Investigation of PE-SiO2@PZS Composite Separator for Lithium-Ion Batteries

Chen

Liu

et al. 2022

Materials

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Commercial polyolefin separators exhibit problems including shrinkage under high temperatures and poor electrolyte wettability and uptake, resulting in low ionic conductivity and safety problems. In this work, core–shell silica-polyphosphazene nanoparticles (SiO2@PZS) with different PZS layer thicknesses were synthesized and coated onto both sides of polyethylene (PE) microporous membranes to prepare composite membranes. Compared to pure silica-coated membranes and PE membranes, the PE-SiO2@PZS composite membrane had higher ionic conductivity. With the increase in the SiO2@PZS shell thickness, the electrolyte uptake, ionic conductivity and discharge capacity gradually increased. The discharge capacity of the PE-SiO2@PZS composite membrane at 8 C rate was 129 mAh/g, which was higher than the values of 107 mAh/g for the PE-SiO2 composite membrane and 104 mAh/g for the PE membrane.

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A Dry Room-Free High-Energy Density Lithium-ion Batteries Enabled by Impurity Scavenging Separator Membrane

Cited by 30 publications

References 49 publications

High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries

High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries

Boosting the Temperature Adaptability of Lithium Metal Batteries via a Moisture/Acid‐Purified, Ion‐Diffusion Accelerated Separator

Fabrication and Investigation of PE-SiO2@PZS Composite Separator for Lithium-Ion Batteries

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A Dry Room-Free High-Energy Density Lithium-ion Batteries Enabled by Impurity Scavenging Separator Membrane

Cited by 30 publications

References 49 publications

High‐Wettability Composite Separator Embedded with in Situ Grown TiO2 Nanoparticles for Advanced Sodium‐Ion Batteries

High‐Wettability Composite Separator Embedded with in Situ Grown TiO2 Nanoparticles for Advanced Sodium‐Ion Batteries

Boosting the Temperature Adaptability of Lithium Metal Batteries via a Moisture/Acid‐Purified, Ion‐Diffusion Accelerated Separator

Fabrication and Investigation of PE-SiO2@PZS Composite Separator for Lithium-Ion Batteries

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Product

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High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries

High‐Wettability Composite Separator Embedded with in Situ Grown TiO₂ Nanoparticles for Advanced Sodium‐Ion Batteries