Designs of high-power gel-assisted bipolar solid-state battery

Patent metadata

Field	Value
Publication number	US-12438244-B2
Application number	US-202217696567-A
Country	US
Kind code	B2
Filing date	Mar 16, 2022
Priority date	Jan 28, 2022
Publication date	Oct 7, 2025
Grant date	Oct 7, 2025

Abstract

A high-power gel-assisted battery stack that cycles lithium ions is provided with two terminal electrodes having opposite polarities and at least one bipolar electrode assembly disposed therebetween. A first electrode is disposed on a first side of a bipolar current collector and a second electrode with an opposite polarity to the first electrode is disposed on a second side of the bipolar current collector. Each electrode includes a porous layer having an electroactive material and a solid-state electrolyte disposed in a polymeric binder. A polymer gel electrolyte is distributed in pores of the porous. The stack also includes at least two free-standing gel separator layers each being disposed between the at least one bipolar electrode assembly and terminal electrodes. Each respective free-standing gel separator layer comprises polyacrylonitrile (PAN) and an electrolyte distributed therein. The high-power gel-assisted battery stack has a maximum voltage rating of ≥about 12V.

First claim

What is claimed is:

1. A high-power gel-assisted battery stack that cycles lithium ions comprising:
a first terminal electrode having a first polarity;
a second terminal electrode having a second polarity opposite from the first polarity;
at least one bipolar electrode assembly disposed between the first terminal electrode and the second terminal electrode,
the at least one bipolar electrode assembly having a first electrode with the first polarity disposed on a first side of a bipolar current collector and a second electrode with the second polarity opposite to the first polarity disposed on a second side of the bipolar current collector,
wherein the first electrode comprises;
a first porous layer comprising:
 a first electroactive material that reversibly cycles lithium ions; and
 a first solid state electrolyte disposed in a first polymeric binder, and
a first polymer gel electrolyte distributed in pores of the first porous layer,
wherein the first electrode has a capacity loading of about 1.05±0.1 mAh/cm 2 , a pressing density of about 2.3±0.3 g/cm 3 , and a moisture content less than or equal to about 600 ppm water, and

wherein the second electrode comprises;
a second porous layer comprising:
 a second electroactive material that reversibly cycles lithium ions; and
 a second solid state electrolyte disposed in a second polymeric binder, and
a second polymer gel electrolyte distributed in pores of the second porous layer,
wherein the second electrode has a capacity loading of about 1.15±0.1 mAh/cm 2 , a pressing density of about 1.6±0.2 g/cm 3 , and a moisture content less than or equal to about 500 ppm water; and

at least two free-standing gel separator layers,
wherein each of the at least two free-standing gel separator layers is disposed between the at least one bipolar electrode assembly and the first terminal electrode or between the at least one bipolar electrode assembly and the second terminal electrode, and
wherein each of the at least two free-standing gel separator layers comprises polyacrylonitrile (PAN) and a first electrolyte distributed therein,

wherein the high-power gel-assisted battery has a maximum voltage rating of greater than or equal to about 12V.

2. The high-power gel-assisted battery stack of claim 1 , wherein at least one of the first electrode or the second electrode further comprises:
an electrically conductive particles distributed in the first porous layer or the second porous layer,
wherein each electrically conductive particle is independently selected from the group consisting of: carbon black, carbon fibers, carbon nanotubes, graphene, graphene oxide, graphite, acetylene black, and combinations thereof.

3. The high-power gel-assisted battery stack of claim 1 , wherein
the first electrode is a positive electrode and the first electroactive material is selected from the group consisting of: LiMn 2 O 4 (LMO), LiMn x Fe 1-x PO 4 (LMFP), where x ranges from about 0.6 to about 0.75, and combinations thereof, and
the first solid-state electrolyte is selected from the group consisting of: Li 7-x La 3 Zr 2-x M x O 12 (LLZO) where M is a metal selected from tantalum (Ta), niobium (Nb), bismuth (Bi), and tin (Sn), the like, where 0≤x<2; Li x La y TiO 3 (LLTO) where 0<x<1 and 0<y<1; Li 1+x+y Al x Ti 2-x P 3-y O 12 where 0≤x<2 and 0≤y<3 (LATP); Li 2+2x Zn 1-x GeO 4 where 0<x<1 (LISICON); Li 2 PO 2 N (LIPON); Li x La 2/3-x TiO 3 where 0<x<2/3; Li 1+x Al x Ti 2-x (PO 4 ) 3 where 0≤x<2; and combinations thereof.

4. The high-power gel-assisted battery stack of claim 1 , wherein
the first electroactive material comprises both LiMn 2 O 4 (LMO) and LiMn x Fe 1-x PO 4 (LMFP), where x ranges from about 0.6 to about 0.75 with a carbon coating disposed thereon,
the first porous layer comprises greater than or equal to about 20 weight % to less than or equal to about 76 weight % of LMO and greater than or equal to about 20 weight % to less than or equal to about 76 weight % LMFP, and
the first solid-state electrolyte comprises Li 1+x+y Al x Ti 2-x P 3-y O 12 where 0≤x<2 and 0≤y<3 (LATP).

5. The high-power gel-assisted battery stack of claim 1 , wherein
both the first polymer gel electrolyte and the second polymer gel electrolyte independently comprises a polymeric host and a second electrolyte,
the second electrolyte comprises a lithium salt, ethylene carbonate (EC), and γ-butyrolactone (GBL),
the polymeric host is selected from the group consisting of: polyvinylidene fluoride (PVDF), polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP), and combinations thereof,
the lithium salt is selected from the group consisting of: lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium bis(oxalato)borate (LiBOB), lithium tetrafluoroborate (LiBF 4 ), and combinations thereof, and
a ratio of EC to GBL is greater than or equal to about 1:1 to less than or equal to about 1:1.5.

6. The high-power gel-assisted battery stack of claim 5 , wherein the first polymer gel electrolyte and the second polymer gel electrolyte each comprises greater than 0 weight % to less than or equal to about 10 weight % of the polymeric host and greater than or equal to about 90 weight % to less than about 100 weight % of the second electrolyte.

7. The high-power gel-assisted battery stack of claim 1 , wherein the first electrolyte comprises:
a lithium salt selected from the group consisting of: lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), lithium tetrafluoroborate (LiBF 4 ), and combinations thereof,
ethylene carbonate (EC), and
γ-butyrolactone (GBL),
a ratio of EC to GBL being greater than or equal to about 1:1 to less than or equal to about 1:1.5.

8. The high-power gel-assisted battery stack of claim 7 , wherein each of the at least two free-standing gel separator layers includes greater than or equal to about 10 weight % to less than or equal to about 15 weight % polyacrylonitrile (PAN) and greater than or equal to about 75 weight % to less than or equal to about 90 weight % of the first electrolyte.

9. The high-power gel-assisted battery stack of claim 1 , wherein the high-power gel-assisted battery stack has having a negative to positive areal ratio of greater than or equal to about 1 to less than or equal to about 1.15.

10. The high-power gel-assisted battery stack of claim 1 , wherein
the second electrode is a negative electrode,
the second electroactive material comprises graphite, and
the second solid-state electrolyte comprises Li 7-x La 3 Zr 2-x M x O 12 (LLZO) where M is a metal selected from tantalum (Ta), niobium (Nb), bismuth (Bi), and tin (Sn), where 0≤x<2.

11. A high-power gel-assisted battery stack that cycles lithium ions comprising:
at least one bipolar electrode assembly disposed between a terminal positive electrode and a terminal negative electrode,
the at least one bipolar electrode assembly having a positive electrode disposed on a first side of a bipolar current collector and a negative electrode disposed on a second side of the bipolar current collector,
wherein the positive electrode comprises:
a first porous composite layer comprising:
a first polymeric binder;
a first electroactive material selected from the group consisting of: LiMn 2 O 4 (LMO), LiMn x Fe 1-x PO 4 (LMFP), where x ranges from about 0.6 to about 0.75, and combinations thereof;
a first solid state electrolyte comprising Li 1+x+y Al x Ti 2-x P 3-y O 12 where 0≤x<2 and 0≤y<3 (LATP); and
a first electrically conductive particle, and

a first polymer gel electrolyte distributed in pores of the first porous composite layer,
wherein the first porous composite layer comprises greater than or equal to about 20 weight % to less than or

Assignees

• Gm Global Tech Operations Llc

Inventors

• Lu Yong
• Li Zhe
• Hou Mengyan
• Su Qili
• Wu Meiyuan
• Que Xiaochao
• Liu Haijing
• Chen Si

Classifications

• Y02P70/50

  Manufacturing or production processes characterised by the final manufactured product · CPC title

• H01M50/449

  having a layered structure · CPC title

• H01M2300/0082

  Organic polymers · CPC title

• H01M4/583

  Carbonaceous material, e.g. graphite-intercalation compounds or CFx · CPC title

• H01M4/131

  Electrodes based on mixed oxides or hydroxides, or on mixtures of oxides or hydroxides, e.g. LiCoOx · CPC title