CA2950513C - Lithium-sulphur cell comprising dinitrile solvent - Google Patents

Lithium-sulphur cell comprising dinitrile solvent Download PDF

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CA2950513C
CA2950513C CA2950513A CA2950513A CA2950513C CA 2950513 C CA2950513 C CA 2950513C CA 2950513 A CA2950513 A CA 2950513A CA 2950513 A CA2950513 A CA 2950513A CA 2950513 C CA2950513 C CA 2950513C
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cell
lithium
sulphur
dinitrile
solvent
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CA2950513A1 (en
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Sebastian DESILANI
Ashley COOKE
Gregory Schmidt
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Gelion Technologies Pty Ltd
Arkema France SA
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Arkema France SA
Johnson Matthey PLC
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/056—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes
    • H01M10/0564—Accumulators with non-aqueous electrolyte characterised by the materials used as electrolytes, e.g. mixed inorganic/organic electrolytes the electrolyte being constituted of organic materials only
    • H01M10/0566—Liquid materials
    • H01M10/0569—Liquid materials characterised by the solvents
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/38—Selection of substances as active materials, active masses, active liquids of elements or alloys
    • H01M4/381—Alkaline or alkaline earth metals elements
    • H01M4/382—Lithium
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/36—Selection of substances as active materials, active masses, active liquids
    • H01M4/58—Selection of substances as active materials, active masses, active liquids of inorganic compounds other than oxides or hydroxides, e.g. sulfides, selenides, tellurides, halogenides or LiCoFy; of polyanionic structures, e.g. phosphates, silicates or borates
    • H01M4/581—Chalcogenides or intercalation compounds thereof
    • H01M4/5815—Sulfides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/62—Selection of inactive substances as ingredients for active masses, e.g. binders, fillers
    • H01M4/624—Electric conductive fillers
    • H01M4/625—Carbon or graphite
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2300/00—Electrolytes
    • H01M2300/0017—Non-aqueous electrolytes
    • H01M2300/0025—Organic electrolyte
    • H01M2300/0028—Organic electrolyte characterised by the solvent
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/417—Polyolefins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/409—Separators, membranes or diaphragms characterised by the material
    • H01M50/411—Organic material
    • H01M50/414—Synthetic resins, e.g. thermoplastics or thermosetting resins
    • H01M50/423—Polyamide resins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/40—Separators; Membranes; Diaphragms; Spacing elements inside cells
    • H01M50/489—Separators, membranes, diaphragms or spacing elements inside the cells, characterised by their physical properties, e.g. swelling degree, hydrophilicity or shut down properties
    • H01M50/491—Porosity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
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  • Materials Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
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  • Physics & Mathematics (AREA)
  • Secondary Cells (AREA)
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Abstract

The present invention relates to a lithium-sulphur cell comprising an anode comprising lithium metal or lithium metal alloy;a cathode comprising a mixture of electroactive sulphur material and solid electroconductive material; and a liquid electrolyte comprising at least one lithium salt and a solvent comprising a dinitrile.

Description

CA 2,950,513 CPST Ref: 13901/00001 LITHIUM-SULPHUR CELL COMPRISING DINITRILE SOLVENT
[0001] The present invention relates to a lithium-sulphur cell.
BACKGROUND
[0002] A typical lithium-sulphur cell comprises an anode (negative electrode) formed from lithium metal or a lithium metal alloy, and a cathode (positive electrode) formed from elemental sulphur or other electroactive sulphur material. The sulphur or other electroactive sulphur-containing material may be mixed with an electrically conductive material, such as carbon, to improve its electrical conductivity. Typically, the carbon and sulphur are ground and then mixed with a solvent and binder to form a slurry. The slurry is applied to a current collector and then dried to remove the solvent. The resulting structure is calendared to form a composite structure, which is cut into the desired shape to form a cathode.
A separator is placed on the cathode and a lithium anode placed on the separator. Electrolyte is introduced into the cell to wet the cathode and separator. The electrolyte typically includes an electrolyte salt dissolved in a solvent.
[0003] Lithium-sulphur cells are secondary cells, and may be recharged by applying an external current to the cell. Rechargeable cells of this type have a wide range of potential applications. Important considerations when developing lithium-sulphur secondary cells include gravimetric energy, cycle life and ease of cell assembly.
[0004] When a lithium-sulphur cell is discharged, the sulphur in the cathode is reduced in two-stages. In the first stage, the electroactive sulphur material (e.g.
elemental sulphur) is reduced to polysulphide species, Sn2- (n 2). These species are generally soluble in the electrolyte. In the second stage of discharge, the polysulphide species are reduced to lithium sulphide, Li2S, which is insoluble. When the cell is charged, the two-stage mechanism occurs in reverse, with the lithium sulphide being oxidised to lithium polysulphide and thereafter to lithium and sulphur.
As well as being a suitable solvent for the electrolyte salt, a solvent for use in lithium sulphur cell should not react with the lithium metal anode and act as a good solvent for the polysulphide species formed upon discharge. As such, the solvent requirements of lithium-sulphur cells are significantly more complex than those of a lithium-ion cell because of the multi-dimensionality introduced at least in part by the intermediate species formed during the charge and discharge of a lithium sulphur cell. Many solvents, such as carbonates, that are typically employed in lithium-ion cells are unsuitable for use in lithium-sulphur cells because they react with the polysulphides formed upon discharge, particularly at high sulphur 382926.1 Date Recue/Date Received 2021-10-12 loadings. The performance of an electrolyte solvent in a lithium-sulphur cell, therefore, cannot be predicted from its performance as an electrolyte solvent in a lithium-ion cell.
Brief Description of the Drawings Figure 1 shows charge-discharge curves at various temperatures for a lithium sulphur cell described in Example 1 and in accordance with the present claims.
Figure 2 shows charge-discharge curves at various temperatures for a comparative lithium sulphur cell described in Example 2.
Description
[0005] Before particular examples of the present invention are described, it is to be understood that the present disclosure is not limited to the particular cell, method or material disclosed herein. It is also to be understood that the terminology used herein is used for describing particular examples only and is not intended to be limiting, as the scope of protection will be defined by the claims and equivalents thereof.
[0006] In describing and claiming the cell and method of the present invention, the following terminology will be used: the singular forms "a", "an", and "the"
include plural forms unless the context clearly dictates otherwise. Thus, for example, reference to "an anode"
includes reference to one or more of such elements.
[0007] According to one aspect of the present invention, there is provided a lithium-sulphur cell comprising:
an anode comprising lithium metal or lithium metal alloy;
a cathode comprising a mixture of electroactive sulphur material and solid electroconductive material; and a liquid electrolyte comprising at least one lithium salt and a solvent comprising a dinitrile.
[0008] In embodiments of the present invention, it has been found that, by using a dinitrile as an electrolyte solvent, the gravimetric energy of the lithium sulphur cell can be increased.
It has also been found that electrolytes formed using dinitriles as solvent may also have favourable viscosity characteristics. Accordingly, such electrolytes can be applied to the cathode in a convenient and efficient manner, facilitating efficient and convenient cell assembly. In embodiments of the present invention, it has also been found that the cycle life of a lithium sulphur cell may also be improved by using a dinitrile as a solvent in the lithium sulphur cell.
[0009] In embodiments of the present invention, it has also been found that the low temperature performance of the lithium sulphur cell may be improved using a dinitrile as a 382926.1 Date Recue/Date Received 2021-10-12 CA 2,950,513 CPST Ref: 13901/00001 solvent. For example, in certain embodiments, the electrolyte may remain in liquid form at temperatures below 0 degrees C, for instance, below -10 degrees C (e.g. up to -30 degrees C).
[0010] The dinitrile may have the formula (I):
382926.1 2a Date Recue/Date Received 2021-10-12 R
NC ¨(--C 1¨CN
n R2 (I) wherein:
n is an integer 2 to 10, and in each ¨CR1R2- linkage, R1 and R2 are each independently selected from H, -OH, amine, amide, ether and a C1 to C6 alkyl group.
[0011] For the avoidance of doubt, each -CR1 R2- linkage may be the same or different. In one embodiment, one of the -CR, R2- linkages is different from the remainder of the -CRi R2-linkages in the dinitrile. The -CRi R2- linkage that is different from the remaining -CRi R2-linkages may be present adjacent a CN group.
[0012] Where R1 and/or R2 is an amine, the amine may have the formula -NRaRb, where each of R9 and Rh is independently H or a hydrocarbyl group. Suitable hydrocarbyl groups include alkyl groups, for example, C1 to C4 alkyl (e.g. methyl, ethyl, propyl or butyl). For example, -NRaRb may be -NH2 or -N(CH3)2. The amine may be a primary, secondary or tertiary amine group.
[0013] Where R1 and/or R2 is an amide, the amide may be ¨NR,C(0)Rb, where each of IR, and Rh is independently H or a hydrocarbyl group., Suitable hydrocarbyl groups include alkyl groups, for example, C1 to 04 alkyl (e.g. methyl, ethyl, propyl or butyl). For example, ¨NR,C(0)Rb may be ¨NHC(0)CH3.
[0014] Where R1 and/or R2 is an ether group, the ether may have the formula ¨0R,, where Ro is a hydrocarbyl group. Suitable hydrocarbyl groups include alkyl groups, for example, Ci to 04 alkyl (e.g. methyl, ethyl, propyl or butyl). For example, the ¨OR, group may be ¨00H3.
[0015] Where R1 and/or R2 is an alkyl group, the alkyl group may be a Ci to C6 alkyl group, for example, methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl and t-butyl, pentyl or hexyl.
[0016] In one embodiment, the dinitrile of formula (I) includes at least 2, for example, 2 to 4 -CR R2- linkages that are of the formula ¨CH2-. Optionally, the dinitrile of formula (I) may also include one or two -CR, R2- linkages of the formula ¨CHR2. The ¨CHR2-linkage may be adjacent a ¨ON group.
[0017] In one embodiment, the dinitrile has the formula (II):
=

NC ( )( r __ CN
I q R4 H R6 (II) wherein:
p is Oar 1, q is an integer of 1 to 9, r is 0 or 1, and
[0018] R3, R4, R5 and Re are each independently selected from H and a C1 to C6 alkyl group (e.g. methyl, ethyl, propyl, i-propyl, n-butyl, i-butyl and t-butyl, pentyl or hexyl, preferably, methyl).
[0019] Preferably, at least one of R3 and R4 is H, and at least one of R5 and R6 is H.
Preferably, at least one of R3, R4, R5 and R6 is a C1 to Ce alkyl group. In one embodiment, R3 is H; R5 is H; and at least one of R4 and R6 is a C1 to C6 alkyl group. For example, in one embodiment. R3 is H; R5 is H; R4 is H and R6 is a C1 to Cs alkyl group.
[0020] In one embodiment, p is 0 and r is 1. In one embodiment, q is 2. For example, p may be 0, r may be 1 and q may be 2.
[0021] Examples of suitable dinitriles include 2-methylglutaronitrile, succinonitrile and adiponitrile.
[0022] As described above, the electrolyte also comprises a lithium salt.
Suitable lithium salts include at least one of lithium hexafluorophosphate (LiPF6), lithium hexafluoroarsenate (LiAsF6), lithium perchlorate (LiC104), lithium trifluoromethanesulfonimide (LiN(CF3S02)2)), lithium borofluoride (LiBF4), lithium trifluoromethanesulphonate (CF3S03Li), and lithium bis(oxalato)borate (LiB(0204)2). Preferably the lithium salt is lithium trifluoromethanesulfonimide (LiN(CF3S02)2)).
[0023] The concentration of lithium salt in the electrolyte is preferably 0.1 to 5M, more preferably 0.2 to 3M, for example, 0.4 to 2 M (e.g. 0.5 to 1M).
[0024] As discussed above, the lithium sulphur cell of the present invention includes an anode, a cathode, an electrolyte and, optionally, a porous separator. The latter may be positioned between the anode and the cathode. The anode is formed of lithium metal or a lithium metal alloy. Preferably, the anode is a metal foil electrode, such as a lithium foil electrode. The lithium foil is formed of lithium metal or lithium metal alloy.
[0025] The cathode of the cell includes a mixture of electroactive sulphur material and electroconductive material. This mixture forms an electroactive layer, which may be placed in contact with a current collector.
[0026] The electroactive sulphur material may comprise elemental sulphur, sulphur-based organic compounds, sulphur-based inorganic compounds and sulphur-containing polymers.
Preferably, elemental sulphur is used.
[0027] The solid electroconductive material may be any suitable conductive material.
Preferably, this solid electroconductive material may be formed of carbon.
Examples include carbon black, carbon fibre, graphene and carbon nanotubes. Other suitable materials include metal (e.g. flakes, filings and powders) and conductive polymers.
Preferably, carbon black is employed.
[0028] The mixture of electroactive sulphur material and electroconductive material may be applied to the current collector in the form of a slurry in a solvent (e.g.
water or an organic solvent). The solvent may then be removed and the resulting structure calendared to form a composite structure, which may be cut into the desired shape to form a cathode. A
separator may be placed on the cathode and a lithium anode placed on the separator.
Electrolyte may then be incorporated into the assembled cell to wet the cathode and separator.
[0029] Alternatively, following the formation of the cathode, the electrolyte may be coated onto the cathode. The separator may then be placed over the coated cathode, and the anode placed over the separator.
[0030] As mentioned above, electrolytes formed using dinitriles as solvent may also have favourable viscosity characteristics. Accordingly, such electrolytes can be applied to the cathode in a convenient and efficient manner, facilitating efficient and convenient cell assembly. In a preferred embodiment of the invention, electrolyte is incorporated into the cell assembly by coating the electrolyte on the cathode, placing the separator over the coated cathode and placing the anode over the separator. The coating may be carried out in any suitable way, for example by spraying, extruding, vacuum filling, pouring and/or spreading the electrolyte over the active sulphur material. After the electrolyte is incorporated into the cell assembly, the cell may be sealed e.g. in an enclosure. The enclosure may be water-tight and/or air-tight. Suitable enclosures include pouches.
[0031] Where a separator is employed, the separator may comprise any suitable porous substrate that allows ions to move between the electrodes of the cell. The separator should be positioned between the electrodes to prevent direct contact between the electrodes. The porosity of the substrate should be at least 30%, preferably at least 50%, for example, above 60%. Preferably, the porosity of the separator is 40-60%, more preferably 45-55%, for example 50%. Suitable separators include a mesh formed of a polymeric material. Suitable polymers include polypropylene, nylon and polyethylene. Non-woven polypropylene is particularly preferred. It is possible for a multi-layered separator to be employed.
[0032] Preferably, the separator is selected from non-woven polypropylene and polyethylene.
[0033] Preferably, the permeability of the separator is less than 300 Gurley, more preferably less than 250 Gurley, for example 200 Gurley.
[0034] The lithium sulphur cell of the present invention is a secondary cell.
When the lithium-sulphur cell is discharged, the sulphur in the cathode is reduced in two-stages. In the first stage, the electroactive sulphur material (e.g. elemental sulphur) is reduced to polysulphide species, Sn2- (n 2). These species are generally soluble in the electrolyte. In the second stage of discharge, the polysulphide species are reduced to lithium sulphide, L12S, which, typically, deposits on the surface of the anode.
[0035] When the cell is charged, the two-stage mechanism occurs in reverse, with the lithium sulphide being oxidised to lithium polysulphide and thereafter to lithium and sulphur.
The electrolyte of the cell, therefore, may include polysulphide species dissolved in the dinitrile.
Example
[0036] All electrolytes were prepared by dissolving lithium bis(trifluoromethylsulfonyl)imide salt (LiTFSI) into the solvents listed in the table below at a concentration of 0.5M.
Electrolytes were then stirred at 30 C for 1 h or until completely dissolved.
[0037] The electrolytes were then incorporated into cells assembled under dry room conditions (dew point < -50 C). Cathode material was composed of sulfur, carbon black and polyethylene oxide binder (PEO) at a ratio of 70:10:20 (w/w), respectively.
The cathode material was cast onto carbon-coated aluminium foil with a typical surface capacity of 1.9-2.0 mAh/cm2. Cells were assembled by wetting the cathode with the electrolyte (3.5 pL/mAh/cm2), which was stacked in turn with a polypropylene separator( Celgard 3501) and 100 pm thick lithium foil anode.
[0038] Discharge-charge performances of the cells were evaluated in galvanostatic mode using a Maccor multi-channel cycler with a voltage range of 1.5-2.45 Vat 30 C.
The cells were discharged and charged at current densities of 0.20 and 0.10, respectively.
[0039] The table below shows the gravimetric energy density achieved with each cell. This was compared to a reference cell formed using 0.5M lithium bis(trifluoromethylsulfonyl)imide salt (LiTFSI) in sulfolane. As can be seen from the table, the cells formed using dinitriles as electrolyte solvents showed significantly improved gravimetric energy densities compared to the reference cell and cells formed using mononitriles as electrolyte solvents.
[0040] C 0.5M 0.5M 0.5M 0.5M 0.5M LiTFSI in 3- 0.5M
0.5M
ell LiTFSI LiTFSI LiTFSI LiTFSI in (dimethyl)aminopropi LiTFSI in LiTFSI in in in 2- in 3- adiponit onitrile benzonit glutaronit Composit sulfola MGN MPN rile rile rile ion ne Gravimetri 173.40 192.1 177.72 199.73 151.10 95.96 190.61 c Energy 6 Density, Wh/kg % of 100.00 110.8 102.49 115.18% 87.14% 55.34% 109.93%
standard % 2%
(gravimetr ic energy density) MPN = 3-methoxypropionitrile MGN = 2-methylglutaronitrile Example 2 A lithium sulphur cell formed using lithium LiTDI (4,5-dicyano-2-(trifluoromethyl)imidazolium) in 2-methylglutaronitrile as an electrolyte was cycled at temperatures ranging from -10 to 30 degrees C. The charge-discharge curves at the various temperatures are shown in Figure 1.
A comparative cell was formed using sulfolane as an electrolyte solvent. The comparative charge-discharge curves are shown in Figure 2. As can be seen from the figures, the cell formed using 2-MGN as an electrolyte solvent has a superior performance at low temperatures.

Claims (12)

CA 2,950,513 CPST Ref: 13901/00001 Claims
1. A lithium-sulphur cell comprising an anode comprising lithium metal or lithium metal alloy;
a cathode comprising a mixture of electroactive sulphur material and solid electroconductive material; and a liquid electrolyte comprising at least one lithium salt, lithium polysulphides and a solvent comprising a dinitrile, wherein the lithium polysulphides are dissolved in the dinitrile.
2. A cell as claimed in claim 1, wherein the dinitrile has the formula (I):
NC ( CI¨CN
n R2 (1) wherein:
n is an integer from 2 to 10, and in each ¨CR1R2- linkage, Ri and R2 are each independently H, -OH, amine, amide, ether or a Ci to C6 alkyl group.
3. A cell as claimed in claim 2, wherein the dinitrile has the formula (II):

NC ( 1.V X 1CN
H R6r (II) wherein:
p is 0 or 1, q is an integer of 1 to 9, r is 0 or 1, wherein p+q+r is an integer from 2 to 10 and R3, R4, R5 and R6 are each independently H or a Ci to C6 alkyl group.

CPST Doc: 382909.3 Date Recue/Date Received 2022-05-09 CA 2,950,513 CPST Ref: 13901/00001
4. A cell as claimed in claim 3, wherein at least one of R3 and R4 is H, and at least one of R5 and R6 is H.
5. A cell as claimed in claim 3 or 4, wherein at least one of R3, R4, R5 and R6 iS C1 tO C6 alkyl group.
6. A cell as claimed in claim 3, wherein p is 0 and r is 1.
7. A cell as claimed in claim 6, wherein q is 2.
8. A cell as claimed in claim 6 or 7, wherein at least one of R5 and R6 is H and the other is C1 to C6 alkyl.
9. A cell as claimed in any one of claims 2 to 8, wherein the Ci to C6 alkyl group is methyl.
10. A cell as claimed in claim 1, wherein the dinitrile is at least one of methylglutaronitrile, succinonitrile and adiponitrile.
11. A cell as claimed in any one of claims 1 to 10, wherein the electroactive sulphur material comprises elemental sulphur.
12. A cell as claimed in any one of claims 1 to 11, wherein the solid electroconductive material comprises carbon.

CPST Doc: 382909.3 Date Reçue/Date Received 2022-05-09
CA2950513A 2014-05-30 2015-05-21 Lithium-sulphur cell comprising dinitrile solvent Active CA2950513C (en)

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