Composite Separators for Robust High Rate Lithium Ion Batteries

Yuan, Botao; Wen, Kechun; Chen, Dongjiang; Liu, Yuanpeng; Dong, Yachao; Feng, Chao; Han, Yupei; Han, Jiecai; Zhang, Yongqi; Xia, Chuan; Sun, Andy; He, Weidong

doi:10.1002/adfm.202101420

Cited by 131 publications

(67 citation statements)

References 230 publications

(217 reference statements)

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“…[10,11] However, polyolefin separators with inferior thermostability lead to the thermal shrinkage and short circuit at high temperatures. [12][13][14] Poly(vinylidene fluoride) (PVDF) has drawn extensive attention owing to its desirable thermal stability, electrolyte affinity and electrochemical stability. [15][16][17][18] Nevertheless, PVDF separator featured with unsatisfactory mechanical strength fails to resist the dendrites growth.…”

Section: Doi: 101002/smll202107664mentioning

confidence: 99%

A Single‐Layer Composite Separator with 3D‐Reinforced Microstructure for Practical High‐Temperature Lithium Ion Batteries

Yuan

Liu

Dong

et al. 2022

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Incorporation of ceramic materials into separators has been frequently applied in both research and industry to improve the overall high‐temperature performances of lithium ion batteries. However, inorganic ceramic particles tend to form aggregation in separators and even fall off in the separator matrix due to the inferior combination between ceramic particles and polymer matrix, giving rise to a decrease in separator porosity and thus the degradation of battery performances. Herein, a single‐layer core‐shell architecture is designed to reinforce the polymer matrix through encircling Al2O3 particles by poly(vinylidene fluoride) with strong inter‐molecular interaction. The 3D‐reinforced microstructure effectively improves pore distribution and thermal stability to resist the dimensional deformation at high temperatures, thus giving rise to a high Coulombic efficiency of 99.16% and 87.5% capacity retention after 500 cycles at 80 °C for LiFePO4/Li batteries. In particular, the excellent performances of the proposed separator microstructure are confirmed with a thickness value of commercial separators. This work provides a promising strategy to fabricate a core‐shell structural composite separator for stable lithium ion batteries at high temperatures.

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Section: Doi: 101002/smll202107664mentioning

confidence: 99%

A Single‐Layer Composite Separator with 3D‐Reinforced Microstructure for Practical High‐Temperature Lithium Ion Batteries

Yuan

Liu

Dong

et al. 2022

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“…The cathode materials can be divided into the following types based on their crystal structures: layered structure, spinel structure, and olivine structure. Despite the advances, they still suffer from poor electrical conductivity, slow Li transport, unfavorable interactions with the electrolyte, low thermal stability, and high-volume expansion ( Sun et al, 2016 ; Liu et al, 2018 ; Yuan et al, 2021 ). To solve the issues, various methods have been developed, including tuning morphology and structure, doping metallic cation, and integrating them with conductive carbon materials.…”

Section: Fundamentals and Challenges Of Cathode Materialsmentioning

confidence: 99%

Carbon-Based Modification Materials for Lithium-ion Battery Cathodes: Advances and Perspectives

Zhou

Yang

Han³

et al. 2022

Front. Chem.

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Lithium-ion batteries (LIBs) have attracted great attention as an advanced power source and energy-storage device for years due to their high energy densities. With rapid growing demands for large reversible capacity, high safety, and long-period stability of LIBs, more explorations have been focused on the development of high-performance cathode materials in recent decades. Carbon-based materials are one of the most promising cathode modification materials for LIBs due to their high electrical conductivity, large surface area, and structural mechanical stability. This feature review systematically outlines the significant advances of carbon-based materials for LIBs. The commonly used synthetic methods and recent research advances of cathode materials with carbon coatings are first represented. Then, the recent achievements and challenges of carbon-based materials in LiCoO2, LiNixCoyAl1-x-yO2, and LiFePO4 cathode materials are summarized. In addition, the influence of different carbon-based nanostructures, including CNT-based networks and graphene-based architectures, on the performance of cathode materials is also discussed. Finally, we summarize the challenges and perspectives of carbon-based materials on the cathode material design for LIBs.

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“…This is attributed to the PIC cross-linked composite separator made by phase transition which can absorb more electrolytes, have higher ionic conductivity, and thus accelerate the migration of Li + . [27] Then, details of the cycling and rate performance of PC separators are shown in Figure S10. In addition, we applied PIC separators to a high-voltage battery system and assembled Li j j NCM811 cells.…”

Section: Chemelectrochemmentioning

confidence: 99%

Enhancing Cellulose‐Based Separator with Polyethyleneimine and Polyvinylidene Fluoride‐Hexafluoropropylene Interpenetrated 3D Network for Lithium Metal Batteries

et al. 2022

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Aside from the electrolyte, a separator is another important component in lithium‐based batteries that has a direct impact on the safety feature and electrochemical performances. To overcome the thermal shrinkage and poor electrolyte affinity of commonly used polyolefin separators, cellulose‐based separators are appealing due to their abundant polar functional groups, thermal stability, and environmental friendliness, especially for large‐sized and high‐energy‐density batteries. Herein, a porous three‐dimensional (3D) network of polymer cellulose‐based separator (denoted as PIC) modified with polyethyleneimine (PEI) and polyvinylidene fluoride‐hexafluoropropylene (PVDF‐HFP) was prepared using a non‐solvent induced phase separation approach. The lithium metal batteries consisting of a PIC separator can deliver a specific capacity of up to 114 mAh g−1 even at a high C‐rate of 8 C (1.36 A g−1) after 300 cycles. Such superior performances of the lithium metal batteries can be attributed to the good wetting ability (390 % electrolyte absorption) and high ionic conductivity (0.754 mS cm−1) of the as‐prepared PIC separator. More importantly, the introduction of polyethyleneimine as a cross‐linking agent significantly improves the mechanical strength of the separator, promotes the uniform deposition of lithium, and compatibility with high voltage (4.4 V) cathode materials LiNi0.8Mn0.1Co0.1O2. This work demonstrates a new strategy for the separator design for high‐performance lithium metal battery applications.

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Composite Separators for Robust High Rate Lithium Ion Batteries

Cited by 131 publications

References 230 publications

A Single‐Layer Composite Separator with 3D‐Reinforced Microstructure for Practical High‐Temperature Lithium Ion Batteries

A Single‐Layer Composite Separator with 3D‐Reinforced Microstructure for Practical High‐Temperature Lithium Ion Batteries

Carbon-Based Modification Materials for Lithium-ion Battery Cathodes: Advances and Perspectives

Enhancing Cellulose‐Based Separator with Polyethyleneimine and Polyvinylidene Fluoride‐Hexafluoropropylene Interpenetrated 3D Network for Lithium Metal Batteries

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