An additive for lithium / carbon fluoride battery electrolytes containing boron trifluoride functional groups

Abstract

This invention belongs to the field of lithium / carbon fluoride primary battery technology, specifically relating to a lithium / carbon fluoride battery electrolyte additive containing boron trifluoride functional groups. The additive, containing 0.5wt%-2wt% of boron trifluoride functional groups, is formulated into a conventional lithium / carbon fluoride battery electrolyte. The overall discharge reaction of the lithium / carbon fluoride battery is xLi + CF₂. x →xLiF+C, because the reaction product LiF is an insulator, it covers the surface and interlayer of fluorinated carbon, severely hindering the reaction of Li. + This invention discovers a novel, low-cost, and easily synthesized additive containing boron trifluoride functional groups. This additive can dissolve the reaction product LiF, allowing fluorinated carbon to release more capacity, thereby improving the discharge voltage plateau and energy density of lithium / carbon fluoride batteries. Moreover, this type of additive is simple to synthesize, has low cost, and is very easy to add, making it easy to scale up production.

Description

Technical Field

[0001] This invention belongs to the field of lithium / carbon fluoride primary battery technology, specifically relating to a lithium / carbon fluoride battery electrolyte additive containing boron trifluoride functional groups. Background Technology

[0002] Lithium / carbon fluoride (LCF) primary batteries are currently the highest energy density type of reserve lithium primary batteries. Compared to other lithium primary batteries, LCF primary batteries have advantages such as stable discharge, safe storage, low self-discharge rate, and environmental friendliness, making them suitable for numerous applications in production and daily life. LCF primary batteries show wide application in medical devices (such as pacemakers and capsule endoscopes) and military equipment (such as drones, missile ignition devices, and submarines). Furthermore, their environmentally friendly and pollution-free characteristics facilitate recycling, reducing environmental pollution and making them an environmentally friendly battery that aligns with my country's current promotion of green energy.

[0003] With the development of society and technology, the demand for battery performance is gradually increasing. Fluorinated carbon, due to its poor conductivity, suffers from poor rate discharge performance, resulting in a growing problem of low effective output capacity under high current discharge conditions. Currently, many efforts have been made to improve the low effective output capacity of lithium / carbon fluoride primary batteries under high current discharge conditions. For example, different carbon materials (such as morphology, crystallinity, and particle size) and fluorination methods (such as high-temperature gas-phase fluorination, low-temperature fluorination, and electrolytic synthesis) are used to obtain fluorinated carbon materials with better electrochemical performance (including fluorinated graphite, fluorinated graphene, and fluorinated carbon nanotubes). However, these methods are relatively complex and not conducive to large-scale industrial applications. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a lithium / carbon fluoride battery electrolyte additive containing boron trifluoride functional groups, which can improve the high-rate discharge performance and discharge platform of lithium / carbon fluoride batteries. It is also abundant in resources, low in cost, simple to prepare, and easy to mass-produce.

[0005] To address the issue of low effective output capacity in lithium / carbon fluoride primary batteries under high-current discharge conditions, existing technologies mostly focus on improving electrode materials. However, the electrolyte, as one of the three main components of the battery, also significantly impacts battery performance due to its compatibility with the battery materials. This invention addresses the aforementioned problems from the perspective of the electrolyte. Compared to current methods for improving lithium / carbon fluoride primary batteries, this approach utilizes abundant and inexpensive raw materials, employs a simple preparation process, and is suitable for large-scale industrial applications.

[0006] The present invention is specifically implemented through the following technical solution.

[0007] An additive for lithium / carbon fluoride battery electrolyte containing boron trifluoride functional groups, wherein 0.5wt%-2wt% of the additive is added to a lithium / carbon fluoride battery electrolyte, the additive containing boron trifluoride functional groups, preferably boron trifluoride-organic base.

[0008] Furthermore, the additive containing boron trifluoride functional groups is boron trifluoride-pyrazine.

[0009] Boron trifluoride-pyrazine was prepared by the following method:

[0010] In a protective gas atmosphere, pyrazine was slowly added to diethyl ether containing boron trifluoride to carry out the reaction. After cooling to room temperature and no white solid was produced, the system was sealed and placed in an environment of -20°C for crystallization. After the crystals were crystallized, they were dried under vacuum.

[0011] Furthermore, the amount of additive added is 1 wt%.

[0012] Furthermore, the additive is added to the lithium / carbon fluoride battery electrolyte and stirred until homogeneous.

[0013] Furthermore, the electrolyte in the lithium / carbon fluoride battery electrolyte is a type of anionic electrolyte lithium salt.

[0014] Furthermore, anionic electrolyte lithium salts include LiBF4, LiPF6, LiBOB, LiTFSI, LiFSI, or LiClO4.

[0015] Furthermore, the solvent in the lithium / carbon fluoride battery electrolyte is a mixture of esters.

[0016] Furthermore, the solvent in the lithium / carbon fluoride battery electrolyte is one or more of the following: ethylene carbonate, ethyl potassium carbonate, dimethyl carbonate, propylene carbonate, ethylene glycol dimethyl ether, vinylene carbonate, fluoroethylene carbonate, methyl propionate, propylene sulfite, dimethyl sulfoxide, sulfolane, and methyl phenyl sulfone.

[0017] Compared with the prior art, the present invention has the following advantages:

[0018] 1. This invention, by adding a boron trifluoride functional group-containing additive to a conventional lithium / carbon fluoride battery electrolyte, can dissolve the reaction product LiF and improve the efficiency of LiF. + The diffusion rate further improves the high-rate discharge performance and discharge platform of lithium / carbon fluoride batteries.

[0019] More specifically, the overall discharge reaction of a lithium / carbon fluoride battery is xLi + CF. x →xLiF+C, because the reaction product LiF is an insulator, it covers the surface and interlayer of fluorinated carbon, severely hindering the reaction of Li. +The transfer of [the energy / energy] is discussed. In this invention, we discovered a novel, low-cost, and easily synthesized additive containing boron trifluoride functional groups. Experiments showed that this additive can dissolve the reaction product LiF, allowing fluorinated carbon to release more capacity, thereby improving the discharge voltage platform and energy density of lithium / carbon fluoride batteries. Taking boron trifluoride-pyrazine as an example, the reaction of its dissolved product LiF is as follows:

[0020] Equation for the reaction of boron trifluoride-pyrazine with LiF:

[0021]

[0022] 2. Because this type of additive is simple to synthesize and has a low cost, and the addition of the additive is very simple to operate, it greatly improves production and makes it easy to achieve large-scale production. Attached Figure Description

[0023] Figure 1 The discharge curves of the lithium / carbon fluoride battery obtained in Comparative Example 1 are shown under different current density conditions.

[0024] Figure 2 These are the discharge curves of the lithium / carbon fluoride battery obtained in Example 1 of this invention at different current densities.

[0025] Figure 3 These are the discharge curves of the lithium / carbon fluoride battery obtained in Example 2 of this invention at different current densities.

[0026] Figure 4 These are the discharge curves of the lithium / carbon fluoride battery obtained in Example 3 of this invention at different current densities.

[0027] Figure 5 These are the discharge curves of the lithium / carbon fluoride battery obtained in Example 4 of this invention at different current densities.

[0028] Figure 6 This is a comparison chart showing the discharge specific capacity of a lithium / carbon fluoride battery made with conventional electrolyte containing additives and a lithium / carbon fluoride battery made with conventional electrolyte without additives under a high current of 2000mA / g.

[0029] Figure 7 This is a bar chart comparing the energy density of a lithium / carbon fluoride battery made with conventional electrolyte containing additives and a lithium / carbon fluoride battery made with conventional electrolyte without additives under a high current of 2000 mA / g.

[0030] Figure 8 The image shows a SEM image of boron trifluoride-pyrazine prepared in Example 1. Detailed Implementation

[0031] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the present invention will be further described below in conjunction with specific embodiments and accompanying drawings. However, the embodiments described are not intended to limit the present invention.

[0032] Unless otherwise specified, the experimental and detection methods described in the following embodiments are conventional methods; unless otherwise specified, the reagents and materials are commercially available.

[0033] To address the issue of low effective output capacity in lithium / carbon fluoride primary batteries under high-current discharge conditions, existing technologies mostly focus on improving electrode materials. However, the electrolyte, as one of the three main components of the battery, also significantly impacts battery performance due to its compatibility with the battery materials. This invention addresses these issues from the perspective of the electrolyte. Compared to current methods for improving lithium / carbon fluoride primary batteries, this approach utilizes abundant and inexpensive raw materials, employs a simple preparation process, and is suitable for large-scale industrial applications.

[0034] The overall discharge reaction of a lithium / fluorinated carbon battery is xLi + CF. x →xLiF+C, because the reaction product LiF is an insulator, it covers the surface and interlayer of fluorinated carbon, severely hindering the reaction of Li. + The present invention involves adding an additive containing boron trifluoride functional groups to the electrolyte of a lithium / carbon fluoride battery. This additive dissolves the reaction product LiF, allowing the fluoride to release more capacity, thereby improving the discharge voltage plateau and energy density of the lithium / carbon fluoride battery. The additive is a boron trifluoride-organic base, and all have similar effects. However, considering raw material costs and preparation methods, boron trifluoride-pyrazine is easier to manufacture and has lower costs compared to other additives.

[0035] In existing technologies, the mechanism of additives in lithium-ion battery electrolytes is as follows: additives reduce the decomposition products of LiPF6 in lithium-ion batteries, enabling them to exhibit excellent capacity retention and maintain low impedance during high-voltage cycling, thereby improving battery life. Therefore, from the perspective of improving battery performance through electrolyte modification, different batteries exhibit different reactions in their electrolytes. Consequently, the additives in lithium-ion battery electrolytes have different functions than the additives in the lithium / fluorinated carbon battery electrolyte of this invention. The additives in this invention, including their dosage and other parameters, are specifically designed for the lithium / fluorinated carbon battery electrolyte described in this invention.

[0036] The present invention will be described in detail below through the following embodiments.

[0037] Example 1

[0038] (1) Preparation of the additive boron trifluoride-pyrazine

[0039] In an argon atmosphere in a glove box, first weigh 22.5g of boron trifluoride diethyl ether into a conical flask, then weigh 3g of pyrazine. Slowly add the pyrazine to the boron trifluoride diethyl ether while continuously shaking the conical flask. Continue shaking the conical flask until all the pyrazine is added to the boron trifluoride diethyl ether. After cooling to room temperature and no white solid is produced, wrap the conical flask with plastic wrap and seal it with a sealing bag. Transfer it to an environment of -20℃ to accelerate further crystallization. Observe the crystallization and adjust the freezing time according to the degree of crystallization.

[0040] The resulting crystals were then collected and placed in a vacuum drying oven at 50°C. Vacuum drying prevents the crystals from contacting air and removes excess ether. After approximately 12 hours of drying, a white powdery solid was obtained. This powder was then ground to obtain a finer powder, which was stored in a glass bottle in a glove box for later use.

[0041] (2) Electrolyte preparation

[0042] Add 0.5 wt% boron trifluoride-pyrazine additive to a lithium / carbon fluoride battery electrolyte of 1 mol / L LiBF4, PC:DME = 1:1 (v:v) system, stir until homogeneous, and use it as the lithium / carbon fluoride battery electrolyte of this embodiment.

[0043] (3) Preparation of positive electrode

[0044] Fluorographite (CF) 1.0 The conductive agent and PVDF binder are mixed evenly in a mass ratio of 8:1:1, coated onto pure aluminum foil, dried at 55°C, and then cut into sheets to obtain the positive electrode sheet of a lithium / carbon fluoride primary battery.

[0045] (4) Preparation of lithium / carbon fluoride primary batteries

[0046] In a glove box filled with high-purity argon gas, the following components are arranged: negative electrode shell, spring sheet, gasket, lithium metal sheet, alumina diaphragm, lithium / fluorinated carbon battery electrolyte of this invention, and fluorinated graphite (CF3). 1.0 The positive electrode sheet and positive electrode shell are assembled in sequence to form a CR2025 button cell.

[0047] Example 2

[0048] The difference between this embodiment and Embodiment 1 is that the amount of additive used in this embodiment is 1 wt%, while the remaining steps are exactly the same as in Embodiment 1. Specifically, it includes the following steps:

[0049] (1) Preparation of the additive boron trifluoride-pyrazine

[0050] In an argon atmosphere in a glove box, first weigh 22.5g of boron trifluoride diethyl ether into a conical flask, then weigh 3g of pyrazine. Slowly add the pyrazine to the boron trifluoride diethyl ether while continuously shaking the conical flask. Continue shaking the conical flask until all the pyrazine is added to the boron trifluoride diethyl ether. After cooling to room temperature and no white solid is produced, wrap the conical flask with plastic wrap and seal it with a sealing bag. Transfer it to an environment of -20℃ to accelerate further crystallization. Observe the crystallization and adjust the freezing time according to the degree of crystallization.

[0051] The resulting crystals were then collected and placed in a vacuum drying oven at 50°C. Vacuum drying prevents the crystals from contacting air and removes excess ether. After approximately 12 hours of drying, a white powdery solid was obtained. This powder was then ground to obtain a finer powder, which was stored in a glass bottle in a glove box for later use.

[0052] (2) Electrolyte preparation

[0053] Add 1 wt% boron trifluoride-pyrazine additive to a lithium / carbon fluoride battery electrolyte of 1 mol / L LiBF4, PC:DME = 1:1 (v:v) system, stir until homogeneous, and use it as the lithium / carbon fluoride battery electrolyte of this embodiment.

[0054] (3) Preparation of positive electrode

[0055] Fluorographite (CF) 1.0 The conductive agent and PVDF binder are mixed evenly in a mass ratio of 8:1:1, coated onto pure aluminum foil, dried at 55°C, and then cut into sheets to obtain the positive electrode sheet of a lithium / carbon fluoride primary battery.

[0056] (4) Preparation of lithium / carbon fluoride primary batteries

[0057] In a glove box filled with high-purity argon gas, the following components are arranged: negative electrode shell, spring sheet, gasket, lithium metal sheet, alumina diaphragm, lithium / fluorinated carbon battery electrolyte of this invention, and fluorinated graphite (CF3). 1.0 The positive electrode sheet and positive electrode shell are assembled in sequence to form a CR2025 button cell.

[0058] Example 3

[0059] The difference between this embodiment and Embodiment 1 is that the amount of additive used in this embodiment is 1.5 wt%, while the remaining steps are exactly the same as in Embodiment 1. Specifically, it includes the following steps:

[0060] (1) Preparation of the additive boron trifluoride-pyrazine

[0061] In an argon atmosphere in a glove box, first weigh 22.5g of boron trifluoride diethyl ether into a conical flask, then weigh 3g of pyrazine. Slowly add the pyrazine to the boron trifluoride diethyl ether while continuously shaking the conical flask. Continue shaking the conical flask until all the pyrazine is added to the boron trifluoride diethyl ether. After cooling to room temperature and no white solid is produced, wrap the conical flask with plastic wrap and seal it with a sealing bag. Transfer it to an environment of -20℃ to accelerate further crystallization. Observe the crystallization and adjust the freezing time according to the degree of crystallization.

[0062] The resulting crystals were then collected and placed in a vacuum drying oven at 50°C. Vacuum drying prevents the crystals from contacting air and removes excess ether. After approximately 12 hours of drying, a white powdery solid was obtained. This powder was then ground to obtain a finer powder, which was stored in a glass bottle in a glove box for later use.

[0063] (2) Electrolyte preparation

[0064] Add 1.5 wt% of boron trifluoride-pyrazine additive to a lithium / carbon fluoride battery electrolyte of 1 mol / L LiBF4, PC:DME = 1:1 (v:v) system, stir until homogeneous, and use it as the lithium / carbon fluoride battery electrolyte of this embodiment.

[0065] (3) Preparation of positive electrode

[0066] Fluorographite (CF) 1.0 The conductive agent and PVDF binder are mixed evenly in a mass ratio of 8:1:1, coated onto pure aluminum foil, dried at 55°C, and then cut into sheets to obtain the positive electrode sheet of a lithium / carbon fluoride primary battery.

[0067] (4) Preparation of lithium / carbon fluoride primary batteries

[0068] In a glove box filled with high-purity argon gas, the following components are arranged: negative electrode shell, spring sheet, gasket, lithium metal sheet, alumina diaphragm, lithium / fluorinated carbon battery electrolyte of this invention, and fluorinated graphite (CF3). 1.0 The positive electrode sheet and positive electrode shell are assembled in sequence to form a CR2025 button cell.

[0069] Example 4

[0070] The difference between this embodiment and Embodiment 1 is that the amount of additive used in this embodiment is 2 wt%, while the remaining steps are exactly the same as in Embodiment 1. Specifically, it includes the following steps:

[0071] (1) Preparation of the additive boron trifluoride-pyrazine

[0072] In an argon atmosphere in a glove box, first weigh 22.5g of boron trifluoride diethyl ether into a conical flask, then weigh 3g of pyrazine. Slowly add the pyrazine to the boron trifluoride diethyl ether while continuously shaking the conical flask. Continue shaking the conical flask until all the pyrazine is added to the boron trifluoride diethyl ether. After cooling to room temperature and no white solid is produced, wrap the conical flask with plastic wrap and seal it with a sealing bag. Transfer it to an environment of -20℃ to accelerate further crystallization. Observe the crystallization and adjust the freezing time according to the degree of crystallization.

[0073] The resulting crystals were then collected and placed in a vacuum drying oven at 50°C. Vacuum drying prevents the crystals from contacting air and removes excess ether. After approximately 12 hours of drying, a white powdery solid was obtained. This powder was then ground to obtain a finer powder, which was stored in a glass bottle in a glove box for later use.

[0074] (2) Electrolyte preparation

[0075] Add 2wt% boron trifluoride-pyrazine additive to a lithium / carbon fluoride battery electrolyte of 1mol / L LiBF4, PC:DME=1:1(v:v) system, stir until homogeneous, and use it as the lithium / carbon fluoride battery electrolyte of this embodiment.

[0076] (3) Preparation of positive electrode

[0077] Fluorographite (CF) 1.0 The conductive agent and PVDF binder are mixed evenly in a mass ratio of 8:1:1, coated onto pure aluminum foil, dried at 55°C, and then cut into sheets to obtain the positive electrode sheet of a lithium / carbon fluoride primary battery.

[0078] (4) Preparation of lithium / carbon fluoride primary batteries

[0079] In a glove box filled with high-purity argon gas, the following components are arranged: negative electrode shell, spring sheet, gasket, lithium metal sheet, alumina diaphragm, lithium / fluorinated carbon battery electrolyte of this invention, and fluorinated graphite (CF3). 1.0 The positive electrode sheet and positive electrode shell are assembled in sequence to form a CR2025 button cell.

[0080] Comparative Example 1

[0081] A CR2025 coin cell was assembled using a lithium / carbon fluoride battery electrolyte system with a 1 mol / L LiBF4 concentration (without any additives) and a PC:DME ratio of 1:1 (v:v). The remaining steps were identical to those in the previous example. Specifically, the following steps were included:

[0082] (1) Electrolyte preparation

[0083] A lithium / carbon fluoride battery electrolyte with a 1 mol / L LiBF4 and PC:DME ratio of 1:1 (v:v) was used as the lithium / carbon fluoride battery electrolyte in this comparative example.

[0084] (2) Preparation of positive electrode

[0085] Fluorographite (CF) 1.0 The conductive agent and PVDF binder are mixed evenly in a mass ratio of 8:1:1, coated onto pure aluminum foil, dried at 55°C, and then cut into sheets to obtain the positive electrode sheet of a lithium / carbon fluoride primary battery.

[0086] (3) Preparation of lithium / carbon fluoride primary batteries

[0087] In a glove box filled with high-purity argon gas, the following components are arranged: negative electrode shell, spring sheet, gasket, lithium metal sheet, alumina diaphragm, lithium / fluorinated carbon battery electrolyte of this invention, and fluorinated graphite (CF3). 1.0 The positive electrode sheet and positive electrode shell are assembled in sequence to form a CR2025 button cell.

[0088] Electrochemical tests were performed on all CR2025 coin cells assembled in the above embodiments and comparative examples. Constant current discharge was performed under different current density conditions, and the discharge cutoff voltage of the battery was set to 1.5V, as shown below. Figures 1-5 The discharge curve of the lithium / carbon fluoride battery is shown below; Figure 6 and Figure 7 The figure shows a bar chart comparing the discharge specific capacity and energy density of a lithium / carbon fluoride battery made with conventional electrolyte containing additives and a lithium / carbon fluoride battery made with conventional electrolyte without additives under a high current of 2000 mA / g. Figure 8 This is a SEM image of the boron trifluoride-pyrazine prepared in Example 1. Figure 8 It can be seen that boron trifluoride-pyrazine is mainly composed of short rod-shaped particles.

[0089] Depend on Figure 1 It can be seen that the additive-free lithium / carbon fluoride batteries exhibit discharge voltage plateaus of 2.52V, 2.48V, 2.45V, 2.36V, 2.26V, and 2.18V at current densities of 50, 100, 200, 500, 1000, and 2000 mA / g, respectively. Figure 2 It was found that the lithium / carbon fluoride batteries containing 0.5 wt% boron trifluoride-pyrazine exhibited discharge voltage plateaus of 2.55, 2.52, 2.48, 2.35, 2.31, and 2.21 V at current densities of 50, 100, 200, 500, 1000, and 2000 mA / g, respectively. Figure 3The discharge voltage plateaus of the lithium / carbon fluoride battery containing 1 wt% boron trifluoride-pyrazine at current densities of 50, 100, 200, 500, 1000, and 2000 mA / g were found to be 2.62, 2.55, 2.49, 2.43, 2.38, and 2.29 V, respectively. Figure 4 The discharge voltage plateaus of the lithium / carbon fluoride battery containing 1.5 wt% boron trifluoride-pyrazine at current densities of 50, 100, 200, 500, 1000, and 2000 mA / g were found to be 2.56, 2.53, 2.48, 2.33, 2.27, and 2.23 V, respectively. Figure 5 The discharge voltage plateaus of the lithium / carbon fluoride battery containing 2wt% boron trifluoride-pyrazine at current densities of 50, 100, 200, 500, 1000, and 2000 mA / g were found to be 2.55, 2.47, 2.43, 2.28, 2.26, and 2.21 V, respectively. Figure 6 It can be seen that, at a current density of 2000 mA / g, the specific capacities of lithium / carbon fluoride primary batteries with different electrolyte systems are 557, 655, 678, 660, and 594 mAh / g, respectively. Figure 7 It can be seen that, at a current density of 2000 mA / g, the energy densities of lithium / carbon fluoride primary batteries with different electrolyte systems are 1168, 1386, 1468, 1404 and 1258 Wh / Kg, respectively.

[0090] Depend on Figures 1-7 The results show that lithium / carbon fluoride primary batteries with boron trifluoride-pyrazine electrolyte exhibit significantly higher discharge plateau, discharge capacity, and energy density than those with electrolytes without any additives. The lithium / carbon fluoride primary battery with 1 wt% boron trifluoride-pyrazine shows the best performance. This indicates that boron trifluoride-pyrazine, as an additive in the electrolyte of lithium / carbon fluoride primary batteries, can significantly improve the discharge voltage plateau and energy density of lithium / carbon fluoride batteries, and alleviate the problem of low effective output capacity under high current discharge conditions.

[0091] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, it is intended to include any modifications and variations that fall within the scope of the claims and their equivalents.

Claims

1. A lithium / carbon fluoride battery characterized by comprising: It includes an electrolyte, which includes an electrolyte additive containing boron trifluoride functional groups, the electrolyte additive having a content of 0.5wt%-2wt%, and the electrolyte additive being boron trifluoride-pyrazine.

2. The lithium / carbon fluoride battery of claim 1 wherein, Boron trifluoride-pyrazine is prepared by the following steps: In a protective gas atmosphere, pyrazine was added to diethyl ether containing boron trifluoride to carry out the reaction. After cooling to room temperature and no white solid was produced, the system was sealed and placed in an environment of -20°C for crystallization. After crystallization, the crystals were dried under vacuum.

3. The lithium / carbon fluoride battery of claim 1 wherein, The content of the electrolyte additive is 1 wt%.

4. The lithium / carbon fluoride battery of claim 1 wherein, The electrolyte additive is added to the lithium / carbon fluoride battery electrolyte and stirred until homogeneous.

5. The lithium / carbon fluoride battery of claim 1 wherein, The electrolyte in the lithium / carbon fluoride battery electrolyte is one of the anionic electrolytes, lithium salts.

6. The lithium / carbon fluoride cell of claim 5 wherein, The lithium salt of the anionic electrolyte is LiBF4, LiPF6, LiBOB, LiTFSI, LiFSI or LiClO4.

7. The lithium / carbon fluoride battery according to claim 1, characterized in that, The solvent in the electrolyte of lithium / carbon fluoride batteries is one or more of the following: ethylene carbonate, potassium ethyl carbonate, dimethyl carbonate, propylene carbonate, ethylene glycol dimethyl ether, vinylene carbonate, fluoroethylene carbonate, methyl propionate, propylene sulfite, dimethyl sulfoxide, sulfolane, and methyl phenyl sulfone.

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