Molten salt electrolyte with low melting point and high conductivity and application thereof

Abstract

The invention provides a low-melting-point high-conductivity molten salt electrolyte and application thereof. The molten salt electrolyte is prepared from the following components in percentage by weight: 24.0 to 31.0 percent of LiCl, 45.0 to 55.0 percent of LiBr, 15.0 to 20.0 percent of KBr and 4.0 to 10.0 percent of KCl. According to the invention, the LiCl-LiBr-KBr-KCl molten salt electrolyte with the melting point of 325.0 + / -3.0 DEG C and the ionic conductivity not lower than 2.87 S / cm is obtained for the first time. Compared with a common LiCl-KCl electrolyte, the fused salt electrolyte has the advantages that the melting point is reduced by 28.0 DEG C, the ionic conductivity at 500.0 DEG C is obviously improved by at least 1.02 S / cm, the thermal stability is high, and the fused salt electrolyte has very important application value in the field of fused salt thermal batteries.

Description

Technical Field

[0001] This invention relates to the field of molten salt thermal battery technology, specifically to a molten salt electrolyte with low melting point and high conductivity for molten salt thermal batteries and its application. Background Technology

[0002] Against the backdrop of frequent local wars and a volatile international situation, the strategic importance of national defense and security has become increasingly prominent. In the contest of military power, the sophistication of weapon systems plays a crucial role in determining the course of war, and thermal batteries, as the power source for weapon systems, directly affect the combat effectiveness of military equipment. Thermal batteries typically use solid molten salt as the electrolyte, utilizing an internal heat source to reach the battery's operating temperature, thereby enabling the battery to conduct electricity. The characteristics of the molten salt electrolyte are directly related to the performance of the thermal battery. Common molten salt electrolytes include LiCl-KCl, LiCl-LiBr-KBr, and LiF-LiCl-LiBr, but these electrolytes have high melting points, low ionic conductivity, and low specific energy, leading to a series of problems such as short operating time and low safety. This restricts the modularization, miniaturization, and long-endurance operation of high-end weaponry, failing to meet the growing needs of national defense and military modernization.

[0003] Current molten salt electrolyte designs are based on modifications of existing molten salt electrolyte systems. For example, the Chinese patent application "A thermal battery electrolyte with low melting point and high conductivity and its preparation method" (Publication No. CN111490261A) developed a LiCl-LiBr-KBr-RbCl molten salt electrolyte with a melting point between 293-303℃ and a molten salt conductivity of 2.17 S / cm at 500.0℃, which is about 0.44 S / cm higher than that of the LiCl-LiBr-KBr molten salt electrolyte. However, RbCl is not only expensive but also has a significant impact on the thermal stability of the electrolyte, resulting in a narrower operating temperature range. In fact, the ratio of the components in a molten salt affects the performance of the molten salt system, but there is no clear quantitative relationship between the ratio of multiple molten salt components and performance. However, simply reducing or increasing the ratio of one or more components in the molten salt system may actually worsen the performance of the molten salt, which is detrimental to the normal use of the thermal battery. Optimizing the proportions of multiple molten salt components to obtain a high-performance molten salt system is a relentless pursuit of researchers. Current molten salt electrolytes cannot simultaneously lower the melting point and increase conductivity, resulting in a significant performance reduction in thermal batteries. Therefore, it is essential to develop a novel low-melting-point, high-conductivity molten salt electrolyte to provide a high-performance power source for next-generation military equipment. Summary of the Invention

[0004] The present invention aims to provide a molten salt electrolyte with low melting point and high conductivity and its application, thereby solving the problems of short working life and low safety of molten salt thermal batteries caused by the inability of existing electrolytes to simultaneously meet the requirements of low melting point and high conductivity.

[0005] Another object of the present invention is to provide the application of the above-mentioned low-melting-point, high-conductivity molten salt electrolyte.

[0006] The present invention specifically adopts the following technical solutions to solve the above-mentioned technical problems:

[0007] In a first aspect, the present invention provides a molten salt electrolyte with a low melting point and high conductivity, comprising the following components in weight percentages: 24.0-31.0 wt% LiCl, 45.0-55.0 wt% LiBr, 15.0-20.0 wt% KBr, and 4.0-10.0 wt% KCl.

[0008] As one of the preferred embodiments, it comprises the following components in weight percentages: 28.9 wt% LiCl, 50.5 wt% LiBr, 16.3 wt% KBr, and 4.3 wt% KCl.

[0009] As a second preferred embodiment, it comprises the following components in weight percentages: 27.5 wt% LiCl, 48.4 wt% LiBr, 15.5 wt% KBr, and 8.6 wt% KCl.

[0010] As a third preferred embodiment, it comprises the following components in weight percentages: 30.8 wt% LiCl, 46.0 wt% LiBr, 16.2 wt% KBr, and 7.0 wt% KCl.

[0011] As a fourth preferred embodiment, it comprises the following components in weight percentages: 24.4 wt% LiCl, 50.1 wt% LiBr, 17.1 wt% KBr, and 8.4 wt% KCl.

[0012] As a fifth preferred embodiment, it comprises the following components in weight percentages: 28.4 wt% LiCl, 45.3 wt% LiBr, 17.7 wt% KBr, and 8.6 wt% KCl.

[0013] The molten salt electrolyte has a melting point ≤328.0℃ and an electronic conductivity ≥2.87S / cm at 500.0℃.

[0014] In a second aspect, the present invention also provides the application of a low-melting-point, high-conductivity molten salt electrolyte in the field of molten salt thermal batteries.

[0015] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0016] This invention uses LiBr as the main component and creatively adds LiCl, KBr, and KCl, optimizing the component ratio to obtain for the first time a LiCl-LiBr-KBr-KCl molten salt electrolyte with a melting point of 325.0±3.0℃ and an ionic conductivity of not less than 2.87 S / cm. This molten salt electrolyte maintains both a low melting point and high conductivity, which is rare among common molten salt electrolytes. Compared with common LiCl-KCl molten salt electrolytes, this molten salt electrolyte has a 28.0℃ lower melting point, a significantly improved ionic conductivity of at least 1.02 S / cm at 500.0℃, and high thermal stability. These superior properties can effectively reduce the cost of heating agents and insulation materials required for thermal batteries, extend the thermal life and working life of thermal batteries, and broaden the operating temperature range of thermal batteries. It is a very promising candidate molten salt electrolyte with significant application value in the field of molten salt thermal batteries. Attached Figure Description

[0017] Figure 1 This is the DSC curve of Example 1;

[0018] Figure 2 This is the DSC curve of Example 2;

[0019] Figure 3 This is the DSC curve of Example 3;

[0020] Figure 4 This is the DSC curve of Example 4;

[0021] Figure 5 This is the DSC curve of Example 5;

[0022] Figure 6 This is the DSC curve for comparison 1;

[0023] Figure 7 This is the DSC curve of Comparative Example 2;

[0024] Figure 8 This is the DSC curve for Comparative Example 3.

[0025] Figure 9 This is a linear graph of the working electrode displacement versus the molten salt resistance in Example 1.

[0026] Figure 10 This is a linear graph of the working electrode displacement versus the molten salt resistance in Comparative Example 1. Detailed Implementation

[0027] To more clearly illustrate the advantages of the technical solution of the present invention, the technical solution of the present invention will be described in detail below through embodiments and in conjunction with the accompanying drawings. The following embodiments are only for illustrating the present invention and are not intended to limit the scope of the present invention.

[0028] Example 1

[0029] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl: 28.9 wt%, LiBr: 50.5 wt%, KBr: 16.3 wt%, and KCl: 4.3 wt% were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered with the glassy carbon crucible lid, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this embodiment. All the above experimental operations were performed in a glove box containing an inert atmosphere.

[0030] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 1 As shown, the melting point of this embodiment is 328.0℃, and the enthalpy of fusion is 53.4 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this embodiment was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this embodiment at 500.0℃ and 600.0℃ were 3.14 S / cm and 3.42 S / cm, respectively. Figure 9 ).

[0031] Example 2

[0032] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl: 27.5 wt%, LiBr: 48.4 wt%, KBr: 15.5 wt%, and KCl: 8.6 wt% were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered with the glassy carbon crucible lid, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this embodiment. All the above experimental operations were performed in a glove box containing an inert atmosphere.

[0033] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 2 As shown, the melting point of this embodiment is 326.0℃, and the enthalpy of fusion is 76.3 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this embodiment was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this embodiment at 500.0℃ was found to be 2.93 S / cm.

[0034] Example 3

[0035] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl: 30.8 wt%, LiBr: 46.0 wt%, KBr: 16.2 wt%, and KCl: 7.0 wt% were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered with the glassy carbon crucible lid, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this embodiment. All experimental operations were performed in a glove box containing an inert atmosphere.

[0036] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 3 As shown, the melting point of this embodiment is 326.0℃, and the enthalpy of fusion is 111.8 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this embodiment was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this embodiment at 500.0℃ was found to be 3.02 S / cm.

[0037] Example 4

[0038] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl: 24.4 wt%, LiBr: 50.1 wt%, KBr: 17.1 wt%, and KCl: 8.4 wt% were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered with the glassy carbon crucible lid, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this embodiment. All the above experimental operations were performed in a glove box containing an inert atmosphere.

[0039] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 4 As shown, the melting point of this embodiment is 326.0℃, and the enthalpy of fusion is 129.8 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this embodiment was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this embodiment at 500.0℃ was found to be 2.87 S / cm.

[0040] Example 5

[0041] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl (28.4 wt%), LiBr (45.3 wt%), KBr (17.7 wt%), and KCl (8.6 wt%) were weighed out. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this embodiment. All experimental operations were performed in a glove box containing an inert atmosphere.

[0042] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 5 As shown, the melting point of this embodiment is 322.0℃, and the enthalpy of fusion is 169.0 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this embodiment was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this embodiment at 500.0℃ was found to be 2.89 S / cm.

[0043] To verify the rationality and accuracy of the low-melting-point, high-conductivity molten salt electrolyte composition proposed in this invention, the following comparative experiments were further conducted:

[0044] Comparative Example 1

[0045] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl (25.3 wt%), LiBr (43.4 wt%), KBr (13.9 wt%), and KCl (17.4 wt%) were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this comparative example. All experimental procedures were performed in a glove box containing an inert atmosphere.

[0046] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 6 As shown, the melting point of the molten salt electrolyte in this comparative example is 337.0℃, and the enthalpy of fusion is 193.4 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this comparative example was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this comparative example at 500.0℃ and 600.0℃ were 2.02 S / cm and 2.51 S / cm, respectively. Figure 10 ).

[0047] Comparative Example 2

[0048] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl (22.1 wt%), LiBr (38.6 wt%), KBr (12.6 wt%), and KCl (26.7 wt%) were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this comparative example. All experimental procedures were performed in a glove box containing an inert atmosphere.

[0049] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 7 As shown, the melting point of the molten salt electrolyte in this comparative example is 353.0℃, and the enthalpy of fusion is 116.4 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this comparative example was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this comparative example at 500.0℃ was found to be 1.79 S / cm.

[0050] Comparative Example 3

[0051] LiCl, LiBr, KBr, and KCl were placed separately into glassy carbon crucibles and then transferred to a high-temperature resistance furnace. The crucibles were heated to 150.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 9.9 h to remove moisture from the molten salt. Using an electronic analytical balance (accuracy 0.0001 g), the following amounts of dried LiCl (19.2 wt%), LiBr (33.8 wt%), KBr (10.9 wt%), and KCl (36.1 wt%) were weighed out respectively. After thorough mixing, the mixture was placed into a clean, dry glassy carbon crucible, covered, and transferred to a high-temperature resistance furnace. The crucibles were heated to 500.0℃ at a heating rate of 6.6℃ / min and held at this temperature for 4.0 h, while stirring the molten salt to ensure uniform mixing. The liquid molten salt was then poured out and allowed to cool naturally to room temperature, yielding the LiCl-LiBr-KBr-KCl molten salt electrolyte of this comparative example. All experimental procedures were performed in a glove box containing an inert atmosphere.

[0052] The prepared LiCl-LiBr-KBr-KCl molten salt electrolyte was tested using differential scanning calorimetry (DSC). The test temperature range was RT-500.0℃, the heating rate was 5.0℃ / min, and the inert gas flow rate was 55.0 mL / min. The test results are as follows: Figure 8 As shown, the melting point of the molten salt electrolyte in this comparative example is 353.0℃, and the enthalpy of fusion is 108.4 J / g. The ionic conductivity of the LiCl-LiBr-KBr-KCl molten salt electrolyte prepared in this comparative example was tested using the continuously varying cell constant method. The ionic conductivity of the molten salt electrolyte in this comparative example at 500.0℃ was found to be 1.52 S / cm.

[0053] Table 1 shows the melting point and conductivity data of Examples 1-5, Comparative Examples 1-3, and LiCl-KCl (the molar percentages of LiCl and KCl are 58.8 mol% and 41.2 mol%, respectively) and LiCl-LiBr-KBr (the molar percentages of LiCl, LiBr, and KBr are 25.0 mol%, 37.0 mol%, and 38.0 mol%, respectively).

[0054] Table 1

[0055] Melting point (°C) Electrical conductivity at 500.0℃ (S / cm) Example 1 328.0 3.14 Example 2 326.0 2.93 Example 3 326.0 3.02 Example 4 326.0 2.87 Example 5 322.0 2.89 Comparative Example 1 337.0 2.02 Comparative Example 2 353.0 1.79 Comparative Example 3 353.0 1.52 LiCl-KCl (58.8mol%-41.2mol%) 353.0 1.85 LiCl-LiBr-KBr (25.0mol%-37.0mol%-38.0mol%) 320.0 1.73

[0056] In summary, the molten salt electrolyte obtained by this invention has a melting point of 325.0 ± 3.0 °C and an ionic conductivity of not less than 2.87 S / cm at 500.0 °C. Its melting point is 25.0 °C lower than that of the classic molten salt thermal battery electrolyte LiCl-KCl, yet its ionic conductivity at 500.0 °C is at least 1.02 S / cm higher than that of LiCl-KCl. The molten salt electrolyte of this invention has a melting point comparable to that of LiCl-LiBr-KBr, but its ionic conductivity at 500.0 °C is at least 1.14 S / cm higher. This molten salt electrolyte maintains both a low melting point and high conductivity, and also exhibits high thermal stability, which is rare among common molten salt electrolytes. However, when the ratio of LiCl, LiBr, KBr, and KCl is not within the range defined by this invention (see Comparative Examples 1-3), the melting point not only increases, but the ionic conductivity also decreases significantly. This will lead to an increase in the amount of heating agent used in the thermal battery, affecting the thermal life and working life of the thermal battery.

Claims

1. A molten salt electrolyte with a low melting point and high conductivity, characterized in that, It comprises the following components by weight percentage: 24.0-31.0 wt% LiCl, 45.0-55.0 wt% LiBr, 15.0-20.0 wt% KBr, and 4.0-10.0 wt% KCl.

2. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, It comprises the following components by weight percentage: 28.9 wt% LiCl, 50.5 wt% LiBr, 16.3 wt% KBr, and 4.3 wt% KCl.

3. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, It comprises the following components by weight percentage: 27.5 wt% LiCl, 48.4 wt% LiBr, 15.5 wt% KBr, and 8.6 wt% KCl.

4. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, It comprises the following components by weight percentage: 30.8 wt% LiCl, 46.0 wt% LiBr, 16.2 wt% KBr, and 7.0 wt% KCl.

5. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, It comprises the following components by weight percentage: 24.4 wt% LiCl, 50.1 wt% LiBr, 17.1 wt% KBr, and 8.4 wt% KCl.

6. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, It comprises the following components by weight percentage: 28.4 wt% LiCl, 45.3 wt% LiBr, 17.7 wt% KBr, and 8.6 wt% KCl.

7. The low-melting-point, high-conductivity molten salt electrolyte according to claim 1, characterized in that, The molten salt electrolyte has a melting point ≤328.0℃ and an electronic conductivity ≥2.87S / cm at 500.0℃.

8. The application of a low-melting-point, high-conductivity molten salt electrolyte according to any one of claims 1-7 in the field of molten salt thermal batteries.

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