An inorganic membrane as a separator for lithium-ion battery

Xiang, Hongfa; Chen, Jingjuan; Zhong, Li; Wang, Haihui

doi:10.1016/j.jpowsour.2011.06.055

Cited by 197 publications

(97 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous work [19], we found that the inorganic Al 2 O 3 separators exhibit a higher ionic conductivity and electrolyte retention than the polymer separator. We also found that LiFePO 4 /graphite cell with the Al 2 O 3 porous separator possesses excellent electrochemical performance, which indicates that the porous Al 2 O 3 separator was very promising to be applied in the lithium-ion batteries.…”

Section: Introductionmentioning

confidence: 87%

“…2b, the Al 2 O 3 particles with the size of 200-500 nm have been successfully sintered and the clear and homogeneous pores with the size of several hundred nanometers have been formed. The porosity of the Al 2 O 3 separator is estimated to be around 70 % based on the geometrical volume of the separator plate and the actual volume of the solid (the ratio of mass and the density of *4 g cm -3 ), which is much higher than that of polymer separators (*40 %) [19]. Although the porosity of 70 % is quite high, the separator still has sufficient mechanical strength owing to the solid bonding caused by re-sintering at 1,500°C.…”

Section: Methodsmentioning

confidence: 98%

“…The porous Al 2 O 3 separators were prepared by a double sintering process as described in our previous work [19]: micro-size alumina (300 mesh), nano-sized Al 2 O 3 powder (Qingdao Xinhai Ltd. Co.), and ethylene diamine tetraacetic acid (EDTA) as a pore-forming agent were mixed at the mass ratio of 3:3:4. Platelets (U 16 mm) were pressed at a pressure of 10 Mbar and sintered at 1,000°C for 5 h in air.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Self-standing integrative cell with an inorganic separator for lithium-ion battery stacks

et al. 2012

Self Cite

View full text Add to dashboard Cite

An integrative cell with a porous Al 2 O 3 membrane as both a support and a separator has been fabricated. LiFePO 4 and graphite were coated onto the both sides of the rigid porous Al 2 O 3 separator, while an electrolyte was infiltrated inside. The LiFePO 4 /graphite integrative cells were evaluated in coin-type cells and exhibited good cycle capacity. The self-standing integrative cell was a simple and promising technology to assemble the battery stacks and meanwhile had an obvious advantage of forming a firm structure, which could avoid inner short circuit during being moved or crashed.

show abstract

Section: Introductionmentioning

confidence: 87%

Section: Methodsmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Self-standing integrative cell with an inorganic separator for lithium-ion battery stacks

et al. 2012

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among them, the purely inorganic separators prepared with the sintering method could have the advantage of "absolutely" thermal stability, strong electrolyte absorption content and no dendrite puncturing problems. 19,20 However, their poor exibility for cell winding assembly limits their practical application.…”

Section: Introductionmentioning

confidence: 99%

Flexible inorganic membranes used as a high thermal safety separator for the lithium-ion battery

Shi¹,

Zhu

Shen

et al. 2018

RSC Adv.

View full text Add to dashboard Cite

A flexible SiO 2 porous fiber membrane (SF) is prepared by electrospinning followed by calcination in this work. Compared with an organic substrate separator, the SF used as a separator will be an absolute guarantee of the battery thermal safety. The porosity of the SF is 88.6%, which is more than twice that of a regular PP separator. Hydrophilic SF shows better electrolyte wetting ability and its high porosity enables the SF to absorb 633% liquid electrolyte on average, while the lithium-ion conductivity reaches mS cm À1. The linear sweep voltammogram testing of PP and SF suggested that SF, with great electrochemical stability, can meet the requirements of lithium-ion batteries. The cyclic and rate performances of batteries prepared with SF are improved significantly. Such advantages of the SF, together with its potential in mass production, make the SF a promising membrane for practical applications in secondary lithium-ion batteries.

show abstract

“…• C) alternatives by using new materials [17][18][19][20] or by coating on the conventional PE/PP separators with thermal-stable ceramic particles. 21,22 Although the morphological and mechanical properties requirement for separators change with temperature, there is little study in the literature on the morphology evolution and/or mechanical behavior of the widely used commercial polymeric separators in the temperature range between operating temperature and melt-down temperature, for example 90…”

mentioning

confidence: 99%

Probing the Roles of Polymeric Separators in Lithium-Ion Battery Capacity Fade at Elevated Temperatures

Chen

Yan

Sun

et al. 2014

J. Electrochem. Soc.

View full text Add to dashboard Cite

The high temperature mechanical property of separators is very important for safety of lithium-ion batteries. However, the mechanical integrity of polymeric separators in lithium-ion batteries at elevated temperatures is still not well characterized. In this paper, the temperature dependent micro-scale morphology change of PP (polypropylene)-PE (polyethylene)-PP sandwiched separators (Celgard 2325) was studied by in-situ high temperature surface imaging using an atomic force microscope (AFM) coupled with power spectral density (PSD) analysis and digital image correlation (DIC) technique. Both PSD and DIC analysis results show that the PP phase significantly closes its pores by means of dilation of the nanofibrils surrounding the pores in the transverse direction and shrinkage in the machine direction, when cycled at 90 • C, even below the separator's shutdown temperature (∼120 • C) and its own melting temperature (165 • C). This is presumably due to surface melting effect in nanostructures and should be size dependent-the surface melting temperature may decrease with the diameter of nanofibrils. Therefore, some pore closing might happen even at operating temperatures, it will lead to capacity fade that is undesired for battery performance.

show abstract

An inorganic membrane as a separator for lithium-ion battery

Cited by 197 publications

References 18 publications

Self-standing integrative cell with an inorganic separator for lithium-ion battery stacks

Self-standing integrative cell with an inorganic separator for lithium-ion battery stacks

Flexible inorganic membranes used as a high thermal safety separator for the lithium-ion battery

Probing the Roles of Polymeric Separators in Lithium-Ion Battery Capacity Fade at Elevated Temperatures

Contact Info

Product

Resources

About