Bifunctional separator, batteries containing, and method of manufacture thereof
A separator for a battery contains a MXene nanosheet, a poly (vinylidene fluoride-co-hexafluoropropylene) framework, and a physical isolation flame retardant dispersed within the poly (vinylidene fluoride-co-hexafluoropropylene) framework. The MXene nanosheet is affixed to the poly (vinylidene fluoride-co-hexafluoropropylene) framework. A separator manufacturing method for the separator herein and a battery manufacturing method are also included.
1 . A separator for a battery comprising a porous material including:
A) Ti 3 C 2 T x MXene nanosheets; and
B) a single poly (vinylidene fluoride-co-hexafluoropropylene) (PVHF)-hydroxyapatite (HAP) layer having first and second sides, a Ti 3 C 2 T x MXene nanosheet of the Ti 3 C 2 T x MXene nanosheets is directly coated on each of the first and second sides of the single PVHF-HAP layer, wherein the PVHF-HAP layer has a hierarchical cross-linked structure of a network of HAP nanowires wrapped by bulk PVHF polymer chains such that the HAP nanowires are separated by the bulk PVHF polymer chains; wherein the Ti 3 C 2 T x MXene nanosheet directly coated on the first side of the single PVHF-HAP layer is adapted to connect directly to a Li anode, and the Ti 3 C 2 T x MXene nanosheet directly coated on the second side of the single PVHF-HAP layer is adapted to connect directly to a LiCoO 2 cathode; and wherein the Ti 3 C 2 T x MXene nanosheet is in the form of a plurality of Ti 3 C 2 T x MXene flakes having an average diameter from about 2 μm to about 50 μm.
2 . The separator according to claim 1 , wherein the plurality of Ti 3 C 2 T x MXene flakes have an average thickness of from about 0.01 nm to about 500 nm.
3 . The separator according to claim 1 , comprising from about 5% to about 20% by weight Ti 3 C 2 T x MXene nanosheet.
4 . The separator according to claim 1 , comprising from about 50% to about 80% by weight poly (vinylidene fluoride-co-hexafluoropropylene) framework.
5 . The separator according to claim 1 , comprising from about 20% to about 80% by weight HAP nanowires.
6 . The separator according to claim 1 , wherein the Ti 3 C 2 T x MXene nanosheet has an average thickness of from about 1 nm to about 10 μm.
7 . The separator according to claim 1 , wherein the PVHF-HAP layer is in form of a membrane.
8 . A battery comprising the separator of claim 1 .
9 . The battery according to claim 8 , wherein the battery is a lithium ion battery having an anode and a cathode.
10 . The battery according to claim 9 , further comprising an electrolyte comprising:
A) lithium hexafluorophosphate;
B) ethylene carbonate;
C) ethyl methyl carbonate; and
D) dimethyl carbonate.
11 . The separator according to claim 1 , the porous material has a pore size from about 0.01 nm to about 10 nm.
12 . The separator according to claim 1 consisting of the porous material.
13 . The separator according to claim 1 , wherein the bulk PVHF polymer chains and the HAP nanowires have a weight ratio of 1:0.6.