公开(公告)号：US20150360409A1

公开(公告)日：2015-12-17

申请号：US14721002

申请日：2015-05-26

Applicant: Nano and Advanced Materials Institute Limited

Inventor： Chenmin LIU ,  Lifeng CAI ,  Ka Kan WONG ,  Shing Yan CHOI

IPC: B29C47/00 ,  H01M2/14 ,  H01M2/16

CPC classification number: B29C48/142 ,  B01D67/0004 ,  B01D69/10 ,  B01D71/26 ,  B01D71/32 ,  B01D71/34 ,  B01D71/76 ,  B01D2323/39 ,  B29K2023/06 ,  B29K2023/12 ,  B29K2027/12 ,  B29K2027/16 ,  B29L2009/00 ,  B29L2031/3468 ,  B29L2031/755 ,  H01M2/145 ,  H01M2/162 ,  H01M2/1666 ,  H01M2/1673 ,  H01M2/1686 ,  H01M10/0525 ,  H01M10/0566 ,  H01M2300/0065 ,  H01M2300/0085

Abstract: This invention provides a method for fabricating a flexible porous film. One application of the film is for fabricating a flexible lithium-ion battery. The method comprises depositing at least one electrospun layer on a flexible substrate sheet by electrospinning. The solution used in electrospinning comprises polyvinylidene fluoride (PVDF) and poly(vinylidene fluoride-hexafluoropropylene) (PVdF-HFP) copolymer dispersed in a solvent such that the solution has a polymer viscosity between 300 cP to 1500 cP. A preferred setting of electrospinning process parameters includes a voltage between 20 kV and 50 kV, a feed rate between 3 ml/h and 12 ml/h, and a spinning height between 100 mm and 150 mm. Preferably, PVDF and PVdF-HFP has a weight ratio between 1:1 and 5:1. The solvent may comprise dimethylformamide (DMF) and acetone in a weight ratio between 1:2 and 8:2. The weight of the copolymer is preferable to be 5% to 25% of a total weight of the copolymer and the solvent.

Abstract translation: 本发明提供一种柔性多孔膜的制造方法。 膜的一个应用是用于制造柔性锂离子电池。 该方法包括通过静电纺丝在柔性基片上沉积至少一个电纺丝层。 用于静电纺丝的溶液包括分散在溶剂中的聚偏二氟乙烯（PVDF）和聚（偏二氟乙烯 - 六氟丙烯）（PVdF-HFP）共聚物，使得该溶液的聚合物粘度在300cP至1500cP之间。 静电纺丝工艺参数的优选设置包括20kV至50kV之间的电压，3ml / h至12ml / h之间的进料速率以及100mm至150mm之间的纺丝高度。 优选地，PVDF和PVdF-HFP的重量比为1:1至5:1。 溶剂可以包括重量比为1:2至8:2的二甲基甲酰胺（DMF）和丙酮。 共聚物的重量优选为共聚物和溶剂总重量的5〜25％。

公开(公告)号：US20150162617A1

公开(公告)日：2015-06-11

申请号：US14541111

申请日：2014-11-13

Applicant: Nano and Advanced Materials Institute Limited

Inventor： Chenmin LIU ,  Lifeng CAI ,  Shing Yan CHOI ,  Ka Kan WONG

IPC: H01M4/62 ,  H01M4/04 ,  H01M4/134 ,  H01M4/1395

CPC classification number: H01M4/625 ,  H01M4/0471 ,  H01M4/134 ,  H01M4/1395 ,  H01M4/366 ,  H01M4/386 ,  H01M4/583 ,  H01M4/587 ,  H01M10/0525 ,  H01M2004/021 ,  H01M2004/027

Abstract: The present invention is to tackle the volume expansion problem of the Si anode materials in the application of lithium ion batteries. In the present invention, a simple and green hydrothermal method is use to form loosely packed Si@C core/shell structure. A carbon coating layer is formed on controllably aggregated silicon nanoparticles in a one-step procedure by the hydrothermal carbonization of a carbon-rich precursor.

Abstract translation: 本发明是为了解决在锂离子电池的应用中Si阳极材料的体积膨胀问题。 在本发明中，简单且绿色的水热法用于形成松散包装的Si @ C核/壳结构。 通过富含碳的前体的水热碳化，以一步法在可控制的聚集的硅纳米颗粒上形成碳涂层。