IP Library › Granted Patent US 12,609,344
Granted Patent B2
US 12,609,344 · App. 16/166,574 · Granted Apr 21, 2026

Method of improving the cycle stability and energy density of a lithium metal secondary battery

Inventor: Bor Z. Jang (Centerville, OH)
Assignee: Honeycomb Battery Company
H01M10/052H01M4/133H01M4/134H01M4/366H01M4/405H01M4/583H01M10/058H01M50/434H01M50/437H01M50/489H01M50/497H01M50/417
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Quick Facts
Patent No.
US 12,609,344
App. No.
16/166,574
Granted
Apr 21, 2026
Kind
B2
Abstract

The invention provides a method of improving the cycle-life of a lithium metal secondary battery containing a non-solid state electrolyte, the method comprising implementing an anode-protecting layer between an anode active material layer and a cathode active material layer without using a porous separator, wherein the anode-protecting layer is in a close physical contact with the anode active material layer, has a thickness from 1 nm to 100 μm and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% and a lithium ion conductivity from 10 −8 S/cm to 5×10 −2 S/cm when measure at room temperature and wherein the anode active material layer contains a layer of lithium or lithium alloy, in a form of a foil, coating, or multiple particles aggregated together, as an anode active material.

Claims (22)

1 . A method of improving a cycle-life of a lithium metal secondary battery containing a non-solid state electrolyte, not including a lithium-sulfur battery or lithium-selenium battery, said method comprising a procedure of implementing an anode- protecting layer between an anode active material layer and a cathode active material layer without using a porous separator, wherein said anode-protecting layer is in a physical contact with said anode active material layer, has a thickness from 1 nm to 100 μm, and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% and a lithium ion conductivity from 10 −8 S/cm to 5×10 −2 S/cm when measured at room temperature and wherein said anode active material layer contains a layer of lithium or lithium alloy, in a form of a foil, coating, or aggregate of multiple particles, as an anode active material, wherein said elastomer contains a material selected from a non-sulfonated or sulfonated versions selected from the group consisting of protein resilin, protein elastin, and combinations thereof.

2 . The method of claim 1 , further comprising laminating said anode active material layer, said anode-protecting layer, and said cathode active material layer together in such manner that the battery is under a compressive stress or strain.

3 . The method of claim 1 , wherein said step of implementing an anode-protecting layer is conducted by depositing a layer of said elastomer onto one primary surface of the anode active material layer to form a protected anode, optionally compressing said protected anode to improve a contact between said anode-protecting layer and said anode active material layer, followed by combining the protected anode and the cathode active material layer together to form said lithium metal secondary battery.

4 . The method of claim 1 , wherein said step of implementing an anode-protecting layer is conducted by depositing a layer of said elastomer onto one primary surface of the cathode active material layer to form a coated cathode, followed by combining the anode active material layer, the coated cathode, and said electrolyte together to form the lithium metal secondary battery.

5 . The method of claim 1 , wherein said step of implementing an anode-protecting layer is conducted by forming a layer of said elastomer, followed by laminating the anode active material layer, the layer of elastomer, the cathode active material layer, along with the electrolyte to form the lithium metal secondary battery, wherein a compressive stress is applied to improve a contact between said anode-protecting layer and said anode active material layer during or after said laminating step.

6 . The method of claim 1 , wherein said elastomer layer further contains from 0.1% to 50% by weight of a lithium ion-conducting additive dispersed therein.

7 . The method of claim 6 , wherein said lithium ion-conducting additive is selected from Li 2 CO 3 , Li 2 O, Li 2 C 2 O 4 , LiOH, LiX, ROCO 2 Li, HCOLi, ROLi, (ROCO 2 Li) 2 , (CH 2 OCO 2 Li) 2 , Li 2 S, Li x SO y , or a combination thereof, wherein X=F, Cl, I, or Br, R=a hydrocarbon group, 0<x≤1 and 1≤y≤4.

8 . The method of claim 6 , wherein said lithium ion-conducting additive is selected from the group consisting of lithium perchlorate (LiClO 4 ), lithium hexafluorophosphate (LiPF 6 ), lithium borofluoride (LiBF 4 ), lithium hexafluoroarsenide (LiAsF 6 ), lithium trifluoro-methanesulfonate (LiCF 3 SO 3 ), bis-trifluoromethyl sulfonylimide lithium (LiN(CF 3 SO 2 ) 2 ), lithium bis(oxalato)borate (LiBOB), lithium oxalyldifluoroborate (LiBF 2 C 2 O 4 ), lithium nitrate (LiNO 3 ), Li-fluoroalkyl-phosphate (LiPF 3 (CF 2 CF 3 ) 3 ), lithium bisperfluoro-ethylsulfonylimide (LiBETI), lithium bis(trifluoromethanesulfonyl)imide, lithium bis(fluorosulfonyl)imide, lithium trifluoromethanesulfonimide (LiTFSI), an ionic liquid-based lithium salt, or a combination thereof.

9 . The method of claim 6 , wherein said lithium ion-conducting additive is selected from the group consisting of poly(ethylene oxide) (PEO), polypropylene oxide (PPO), poly(acrylonitrile) (PAN), poly(methyl methacrylate) (PMMA), poly(vinylidene fluoride) (PVDF), poly bis-methoxy ethoxyethoxide-phosphazene, polyvinyl chloride, polydimethylsiloxane, poly(vinylidene fluoride)-hexafluoropropylene (PVDF-HFP), sulfonated derivatives thereof, and combinations thereof.

10 . The method of claim 1 , wherein said cathode active material is selected from an inorganic material, an organic material, a polymeric material, or a combination thereof, and said inorganic material does not include sulfur or alkali metal polysulfide.

11 . The method of claim 10 , wherein said inorganic material is selected from a metal oxide, metal phosphate, metal silicide, metal selenide, transition metal sulfide, or a combination thereof.

12 . The method of claim 11 , wherein said metal oxide contains a vanadium oxide selected from the group consisting of VO 2 , LixVO 2 , V 2 O 5 , Li x V 2 O 5 , V 3 O 8 , Li x V 3 O 8 , Li x V 3 O 7 , V 4 O 9 , Li x V 4 O 9 , V 6 O 13 , Li x V 6 O 13 , their doped versions, their derivatives, and combinations thereof, wherein 0.1<x<5.

13 . The method of claim 11 , wherein said metal oxide or metal phosphate is selected from a layered compound LiMO 2 , spinel compound LiM 2 O 4 , olivine compound LiMPO 4 , silicate compound Li 2 MSiO 4 , tavorite compound LiMPO 4 F, borate compound LiMBO 3 , or a combination thereof, wherein M is a transition metal or a mixture of multiple transition metals.

14 . The method of claim 10 , wherein said inorganic material is selected from the group consisting of lithium cobalt oxide, lithium nickel oxide, lithium manganese oxide, lithium vanadium oxide, lithium-mixed metal oxide, lithium iron phosphate, lithium manganese phosphate, lithium vanadium phosphate, lithium mixed metal phosphate, lithium metal silicide, and combinations thereof.

15 . The method of claim 10 , wherein said inorganic material is selected from a metal fluoride or metal chloride including the group consisting of CoF 3 , MnF 3 , FeF 3 , VF 3 , VOF 3 , TiF 3 , BiF 3 , NiF 2 , FeF 2 , CuF 2 , CuF, SnF 2 , AgF, CuCl 2 , FeCl 3 , MnCl 2 , and combinations thereof.

16 . The method of claim 10 , wherein said inorganic material is selected from a lithium transition metal silicate, denoted as LizMSiO 4 or Li 2 Ma x Mb y SiO 4 , wherein M and Ma are selected from Fe, Mn, Co, Ni, V, or VO; Mb is selected from Fe, Mn, Co, Ni, V, Ti, Al, B, Sn, or Bi; and x+y≤1.

17 . The method of claim 10 , wherein said inorganic material is selected from a transition metal dichalcogenide, a transition metal trichalcogenide, or a combination thereof.

18 . The method of claim 10 , wherein said inorganic material is selected from TiS 2 , TaS 2 , MoS 2 , NbSe 3 , MnO 2 , CoO 2 , an iron oxide, a vanadium oxide, or a combination thereof.

19 . The method of claim 10 , wherein said inorganic material is selected from the group consisting of (a) bismuth selenide or bismuth telluride, (b) transition metal dichalcogenide or trichalcogenide, (c) sulfide, selenide, or telluride of niobium, zirconium, molybdenum, hafnium, tantalum, tungsten, titanium, cobalt, manganese, iron, nickel, or a transition metal; (d) boron nitride, and (e) combinations thereof.

20 . A method of improving a cycle-life of a lithium metal secondary battery containing a non-solid state electrolyte, not including a lithium-sulfur battery or lithium-selenium battery, said method comprising a procedure of implementing an anode- protecting layer between an anode active material layer and a cathode active material layer without using a porous separator, wherein said anode-protecting layer is in a physical contact with said anode active material layer, has a thickness from 1 nm to 100 μm, and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% and a lithium ion conductivity from 10 −8 S/cm to 5×10 −2 S/cm when measured at room temperature and wherein said anode active material layer contains a layer of lithium or lithium alloy, in a form of a foil, coating, or aggregate of multiple particles, as an anode active material, wherein said elastomer contains a material selected from a non-sulfonated or sulfonated versions selected from the group consisting of protein resilin, protein elastin, and combinations thereof.

21 . The method of claim 20 , wherein said non-solid state electrolyte is selected from the group consisting of organic liquid electrolyte, ionic liquid electrolyte, polymer gel electrolyte, quasi-solid electrolyte having a lithium salt dissolved in an organic or ionic liquid with a lithium salt concentration higher than 2.0 M, and combinations thereof.

22 . A method of improving a cycle-life of a lithium metal secondary battery containing a non-solid state electrolyte, not including a lithium-sulfur battery or lithium-selenium battery, said method comprising a procedure of implementing an anode-protecting layer between an anode active material layer and a cathode active material layer without using a porous separator, wherein said anode-protecting layer is in a physical contact with said anode active material layer, has a thickness from 1 nm to 100 μm, and comprises an elastomer having a fully recoverable tensile elastic strain from 2% to 1,000% and a lithium ion conductivity from 10 −8 S/cm to 5×10 −2 S/cm when measured at room temperature and wherein said anode active material layer contains a layer of lithium or lithium alloy, in a form of a foil, coating, or aggregate of multiple particles, as an anode active material, wherein said elastomer layer comprises from 0.01% to 50% of an electrically non-conducting reinforcement material dispersed therein, wherein said reinforcement material is selected from the group consisting of a ceramic fiber, polymer fiber, polymer particle, and combinations thereof, wherein said elastomer contains a material selected from a non-sulfonated or sulfonated versions selected from the group consisting of protein resilin, protein elastin, and combinations thereof.

Assignments (3)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Feb 28, 2024
From: GLOBAL GRAPHENE GROUP, INC.
To: HONEYCOMB BATTERY COMPANY
Reel/Frame 066957/0745 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jul 17, 2019
From: NANOTEK INSTRUMENTS, INC.
To: GLOBAL GRAPHENE GROUP, INC.
Reel/Frame 049784/0650 →
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Oct 22, 2018
From: JANG, BOR Z
To: NANOTEK INSTRUMENTS, INC.
Reel/Frame 047262/0303 →
Continuity (2)
Continuation In Part 16014623 · Jun 21, 2018
Related Publication 20190393542A1 · Dec 26, 2019
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