Lithium manganese battery electrolyte, preparation method and application thereof

Abstract

This application provides a lithium-manganese battery electrolyte, its preparation method, and its application, belonging to the field of battery electrolyte technology. The electrolyte comprises lithium salt, organic solvent, and additives. The additives include one or more of the following: organosilicon source, toluenesulfonyl isocyanate, 1,3-propanesulfonate lactone, 1,4-butanesulfonate lactone, and triphenyl phosphite. This application improves the long-term storage stability and compatibility with elemental lithium of the electrolyte, forms a relatively dense SEI film on the positive and negative electrode surfaces, reduces side reactions during storage, improves the long-term storage performance of the battery, reduces the battery's self-discharge rate, and is a more suitable electrolyte for the characteristics of the lithium-manganese battery system and the operating environment, thus extending the battery's storage life.

Description

Technical Field

[0001] This invention relates to the field of battery electrolyte technology, specifically to a lithium manganese battery electrolyte, its preparation method, and its application. Background Technology

[0002] Lithium-manganese batteries, due to their advantages such as high energy density, low self-discharge rate, and safety, are used in applications requiring long-term storage, maintenance-free operation, or high energy density. Because these applications require prolonged silent storage, the lifespan of a typical lithium-manganese battery platform is 10 years, while the actual storage life of the lithium-manganese battery is generally 5-7 years, necessitating battery replacement every 5 years. This increases maintenance costs and battery replacement frequency. To achieve a platform that operates without battery replacement throughout its entire mission cycle, the battery's storage life needs to be extended to 10 years or even higher, placing higher demands on the storage performance of lithium-manganese batteries.

[0003] Electrolyte is a crucial component of a battery, responsible for transporting ions between the positive and negative electrodes within the battery. It significantly impacts battery capacity, operating temperature range, storage performance, and safety. During storage, both the positive and negative electrodes of a lithium-ion battery are immersed in the electrolyte. Thermodynamically unstable substances are prone to side reactions, such as dissolution of active materials, corrosion of current collectors, and interfacial reactions between the electrodes and the electrolyte. As storage time increases, the impact of these reactions on the battery grows, ultimately affecting battery life and even causing safety issues. Currently, the most widely used commercial electrolyte system is a mixed carbonate solution of lithium hexafluorophosphate. This system is primarily used in lithium-ion batteries, but its compatibility with elemental lithium in lithium-manganese batteries needs improvement, especially in reducing side reactions during long-term storage to meet the long-term storage requirements of lithium-manganese batteries. Summary of the Invention

[0004] In view of the technical problems existing in the background art, this application provides a lithium manganese battery electrolyte, its preparation method and application, aiming to solve the technical problems that thermodynamically unstable substances in existing lithium manganese battery electrolytes are prone to side reactions during long-term storage and have insufficient compatibility with elemental lithium.

[0005] In a first aspect, embodiments of this application provide a lithium manganese battery electrolyte, comprising lithium salt, organic solvent and additives, wherein the additives include one or more of organosilicon source, toluenesulfonyl isocyanate, 1,3-propanesulfonate lactone, 1,4-butanesulfonate lactone and triphenyl phosphite, and the additives account for 2% to 5% of the total mass of the electrolyte.

[0006] In the technical solution of this application embodiment, adding an organosilicon source to the electrolyte can reduce electrolyte loss during charging and discharging, reduce electrolyte changes and internal resistance increases, reduce electrolyte volatilization, and maintain electrolyte stability; 1,3-propanesulfonate lactone can inhibit side reactions on the electrolyte surface, reduce metal ion dissolution, and increase battery cycle life and storage stability; toluenesulfonyl isocyanate can form a stable solid electrolyte interface (SEI) film on the lithium metal anode, improve the compatibility between the lithium metal anode and the electrolyte, and can also react with trace amounts of water, hydroxyl groups, and F- ions in the electrolyte, improving electrolyte stability, cycle performance, and storage performance; 1,4-butanesulfonate lactone can improve the battery's high-temperature resistance and prevent gas expansion.

[0007] The additives in this application can improve the long-term storage stability of the electrolyte and its compatibility with elemental lithium, form a relatively dense passivation film on the negative electrode surface, reduce the occurrence of side reactions during storage, improve the long-term storage performance of the battery, and reduce the self-discharge rate of the battery.

[0008] Preferably, the additive includes an organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate, wherein the mass ratio of the organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate is 6:(2~3):(1~2).

[0009] Preferably, the organosilicon source includes one or more of methyl orthosilicate, ethyl orthosilicate, and propyl orthosilicate.

[0010] Preferably, the additives include toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone and triphenyl phosphite, wherein the mass ratio of toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone and triphenyl phosphite is 6:(1~3):(1~3).

[0011] Preferably, the lithium salt includes one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium difluorosulfonylimide.

[0012] In the technical solutions of this application, the electrolyte salt selected in this application has high stability and high chemical and electrochemical stability with the lithium anode, current collector, active material, conductive agent, etc.

[0013] Preferably, the concentration of lithium salt in the organic solvent is 1~2 mol / L.

[0014] Preferably, the organic solvent includes one or more of dimethyl carbonate, vinylene carbonate, ethylene carbonate, propylene carbonate, methyl ethyl carbonate, tetrahydrofuran, and sulfolane.

[0015] In the technical solution of this application embodiment, the mixed solvent prepared by the above-mentioned organic solvent has a high boiling point, high flash point, large dielectric constant and good stability. It can form a dense double SEI film on the surface of the electrode material, which can better cover the surface of the negative electrode material, effectively reduce the reduction and decomposition of the contact surface between the electrolyte and the battery negative electrode material during long-term storage, thereby increasing the storage stability of the battery and reducing the self-discharge rate of the battery.

[0016] Secondly, this application provides a method for preparing a lithium manganese battery electrolyte, comprising the following steps: adding lithium salt to an organic solvent and mixing it evenly, adding additives thereto, stirring and dispersing under heating conditions, and obtaining the electrolyte after cooling.

[0017] Preferably, the heating temperature is 50~60℃.

[0018] Thirdly, embodiments of this application provide a lithium manganese battery, including the aforementioned lithium manganese battery electrolyte.

[0019] The advantages of this application, which differ from existing technical solutions, include:

[0020] This application improves the long-term storage stability and compatibility with elemental lithium of the electrolyte, forming a denser SEI film on the surfaces of the positive and negative electrodes. This reduces side reactions during storage, improves the long-term storage performance of the battery, lowers the self-discharge rate, and provides an electrolyte that is more compatible with the characteristics of lithium-manganese battery systems and the operating environment, thus extending the battery's storage life. Under long-term storage conditions, this application maintains stable performance, with fewer side reactions and an annual self-discharge rate of less than 1%. After 10 years of long-term storage, the battery's voltage, internal resistance, and other parameters remain normal, and it retains more than 90% of its capacity.

[0021] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of this application, the accompanying drawings used in this application will be briefly described below. Obviously, the drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without any creative effort.

[0023] Figure 1 The discharge curves of the lithium manganese battery prepared with the electrolyte in Example 1 before and after high-temperature storage are shown. Detailed Implementation

[0024] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0026] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0028] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0029] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0030] During storage, both the positive and negative electrodes of a lithium-ion battery are immersed in the electrolyte. Thermodynamically unstable substances are prone to side reactions, such as the dissolution of active materials, corrosion of the current collector, and interfacial reactions between the electrode and electrolyte. As storage time increases, the impact of these reactions on the battery grows, ultimately affecting battery life and even causing safety issues. Currently, the most widely used commercial electrolyte system is a mixed carbonate solution of lithium hexafluorophosphate. This system is mostly used in lithium-ion batteries, but its compatibility with elemental lithium in lithium-manganese batteries needs improvement, especially in reducing side reactions during long-term storage to meet the long-term storage requirements of lithium-manganese batteries.

[0031] To address the technical problems of thermodynamically unstable substances in existing lithium-manganese battery electrolytes easily undergoing side reactions during long-term storage and insufficient compatibility with elemental lithium, this application provides a lithium-manganese battery electrolyte, its preparation method, and its application. Through the selection of lithium salts, solvents, and additives, the electrolyte maintains stable performance under long-term storage conditions, exhibits fewer battery side reactions, has an annual self-discharge rate of less than 1%, and after 10 years of long-term storage, the battery's voltage, internal resistance, and other properties remain normal, while retaining over 90% of its capacity.

[0032] In a first aspect, embodiments of this application provide a lithium manganese battery electrolyte, comprising lithium salt, organic solvent and additives, wherein the additives include one or more of organosilicon source, toluenesulfonyl isocyanate, 1,3-propanesulfonate lactone, 1,4-butanesulfonate lactone and triphenyl phosphite, and the additives account for 2% to 5% of the total mass of the electrolyte.

[0033] In the technical solution of this application embodiment, adding an organosilicon source to the electrolyte can reduce electrolyte loss during charging and discharging, reduce electrolyte changes and internal resistance increases, reduce electrolyte volatilization, and maintain electrolyte stability; 1,3-propanesulfonate lactone can inhibit side reactions on the electrolyte surface, reduce metal ion dissolution, and increase battery cycle life and storage stability; toluenesulfonyl isocyanate can form a stable solid electrolyte interface (SEI) film on the lithium metal anode, improve the compatibility between the lithium metal anode and the electrolyte, and can also react with trace amounts of water, hydroxyl groups, and F- ions in the electrolyte, improving electrolyte stability, cycle performance, and storage performance; 1,4-butanesulfonate lactone can improve the battery's high-temperature resistance and prevent gas expansion.

[0034] The additives in this application can improve the long-term storage stability of the electrolyte and its compatibility with elemental lithium, form a relatively dense passivation film on the negative electrode surface, reduce the occurrence of side reactions during storage, improve the long-term storage performance of the battery, and reduce the self-discharge rate of the battery.

[0035] Preferably, the additive includes an organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate, wherein the mass ratio of the organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate is 6:(2~3):(1~2).

[0036] Preferably, the organosilicon source includes one or more of methyl orthosilicate, ethyl orthosilicate, and propyl orthosilicate.

[0037] Preferably, the additives include toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone and triphenyl phosphite, wherein the mass ratio of toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone and triphenyl phosphite is 6:(1~3):(1~3).

[0038] Preferably, the lithium salt includes one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium difluorosulfonylimide.

[0039] In the technical solutions of this application, the electrolyte salt selected in this application has high stability and high chemical and electrochemical stability with the lithium anode, current collector, active material, conductive agent, etc.

[0040] Preferably, the concentration of lithium salt in the organic solvent is 1~2 mol / L.

[0041] Preferably, the organic solvent includes one or more of dimethyl carbonate, vinylene carbonate, ethylene carbonate, propylene carbonate, methyl ethyl carbonate, tetrahydrofuran, and sulfolane.

[0042] In the technical solution of this application embodiment, the mixed solvent prepared by the above-mentioned organic solvent has a high boiling point, high flash point, large dielectric constant and good stability. It can form a dense double SEI film on the surface of the electrode material, which can better cover the surface of the negative electrode material, effectively reduce the reduction and decomposition of the contact surface between the electrolyte and the battery negative electrode material during long-term storage, thereby increasing the storage stability of the battery and reducing the self-discharge rate of the battery.

[0043] Secondly, this application provides a method for preparing a lithium manganese battery electrolyte, comprising the following steps: adding lithium salt to an organic solvent and mixing it evenly, adding additives thereto, stirring and dispersing under heating conditions, and obtaining the electrolyte after cooling.

[0044] Preferably, the heating temperature is 50~60℃.

[0045] Thirdly, embodiments of this application provide a lithium manganese battery, including the aforementioned lithium manganese battery electrolyte.

[0046] The following are some specific embodiments. It should be noted that the embodiments described below are exemplary and are only used to explain this application, and should not be construed as limiting this application. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in this field or according to the product instructions. Reagents or instruments whose manufacturers are not specified are all conventional products that can be obtained commercially.

[0047] I. Preparation Method

[0048] Example 1

[0049] The preparation method of the lithium manganese battery electrolyte in Example 1 includes the following steps: At room temperature, 1 mol of lithium hexafluorophosphate is dissolved in 1 L of an organic solvent composed of dimethyl carbonate and ethyl methyl carbonate in a 1:1 ratio in a glove box. 96 g of the above solution is taken, and then 2.4 g of methyl orthosilicate, 1.2 g of 1,3-propanesulfonic acid lactone and 0.4 g of toluenesulfonyl isocyanate are added. After thorough stirring, the electrolyte is prepared.

[0050] Example 2

[0051] The preparation method of the battery electrolyte in Example 2 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate is dissolved in 1 L of an organic solvent composed of dimethyl carbonate, ethyl methyl carbonate, and vinylene carbonate in a 5:4:1 ratio; 96 g of the above solution is taken, and then 2.4 g of methyl orthosilicate, 0.8 g of 1,3-propanesulfonic acid lactone, and 0.8 g of toluenesulfonyl isocyanate are added. After thorough stirring, the electrolyte is prepared.

[0052] Example 3

[0053] The preparation method of the battery electrolyte in Example 3 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate and 0.2 mol of lithium perchlorate are dissolved in 1 L of an organic solvent composed of dimethyl carbonate and ethyl methyl carbonate in a 1:1 ratio. 96 g of the above solution is then taken, and 2.4 g of toluenesulfonyl isocyanate, 0.8 g of 1,4-butanesulfonate lactone, and 0.8 g of triphenyl phosphite are added. After thorough stirring, the electrolyte is prepared.

[0054] Example 4

[0055] The preparation method of the battery electrolyte in Example 4 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate and 0.2 mol of lithium perchlorate are dissolved in 1 L of an organic solvent composed of dimethyl carbonate, ethyl methyl carbonate, and vinylene carbonate in a 5:4:1 ratio. 96 g of this solution is then taken, and 2.4 g of toluenesulfonyl isocyanate, 1.2 g of 1,4-butanesulfonate lactone, and 0.4 g of triphenyl phosphite are added. After thorough stirring, the electrolyte is prepared.

[0056] Example 5

[0057] The preparation method of the battery electrolyte in Example 6 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate is dissolved in 1 L of an organic solvent composed of dimethyl carbonate and ethyl methyl carbonate in a 1:1 ratio; 96 g of the above solution is taken, and then 2.4 g of toluenesulfonyl isocyanate, 0.4 g of 1,4-butanesulfonate lactone, and 1.2 g of triphenyl phosphite are added. After thorough stirring, the electrolyte is prepared.

[0058] Comparative Example 1

[0059] The difference between the preparation method of the battery electrolyte in Comparative Example 1 and Example 1 is that 1 mol of lithium hexafluorophosphate and 0.2 mol of lithium difluorooxalate borate are dissolved in 1 L of an organic solvent composed of dimethyl carbonate, ethyl methyl carbonate and vinylene carbonate in a ratio of 5:4:1.

[0060] Comparative Example 2

[0061] The preparation method of the battery electrolyte in Comparative Example 2 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate is dissolved in 1 L of an organic solvent composed of dimethyl carbonate and ethyl methyl carbonate in a 1:1 ratio. After thorough stirring, the electrolyte is prepared.

[0062] Comparative Example 3

[0063] The preparation method of the battery electrolyte in Comparative Example 3 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate and 0.2 mol of lithium perchlorate are dissolved in 1 L of an organic solvent composed of dimethyl carbonate and ethyl methyl carbonate in a 1:1 ratio. After thorough stirring, 98 g of the above solution is taken, and then 1.2 g of 1,3-propanesulfonate lactone and 0.8 g of 1,4-butanesulfonate lactone are added. After thorough stirring, the electrolyte is prepared.

[0064] Comparative Example 4

[0065] The preparation method of the battery electrolyte in Comparative Example 4 differs from that in Example 1 in that: 1 mol of lithium hexafluorophosphate is dissolved in 1 L of an organic solvent composed of dimethyl carbonate, ethyl methyl carbonate, and vinylene carbonate in a 5:4:1 ratio. After thorough stirring, 98 g of the above solution is taken, and 2 g of methyl orthosilicate is added. After thorough stirring, the electrolyte is prepared.

[0066] II. Testing Methods

[0067] A soft-pack lithium-manganese primary battery is manufactured by using a mixture of manganese dioxide, expanded graphite, and Ketjen black as the positive electrode, lithium strip as the negative electrode, and polypropylene ceramic separator as the separator, and injecting electrolyte.

[0068] 1. The storage performance of the obtained lithium-manganese primary battery was tested using the following method:

[0069] Accelerated storage test

[0070] 1) Acceleration Model

[0071] Referring to GJB 736.8, using the modified Arrhenius reaction rate theory, the acceleration coefficient and the temperature coefficient of the reaction rate exist in the following reaction equation:

[0072]

[0073] In the formula:

[0074] τ -- Acceleration coefficient;

[0075] r—Temperature coefficient of reaction rate, taken as 2.3;

[0076] T1—Accelerated test absolute temperature, in K;

[0077] T0—Comparative absolute temperature, in K;

[0078] A—Temperature change corresponding to the temperature coefficient of reaction rate, taken as 10K;

[0079] Right now:

[0080]

[0081] The accelerated test time can be calculated using the following formula.

[0082]

[0083] In the formula:

[0084] t1 — Time (days) required for accelerated testing at absolute temperature T1;

[0085] t0 — Storage time (days) at absolute temperature T0.

[0086] Calculations show that a battery stored at 72°C for 73 days is equivalent to a battery stored at 25°C for 10 years.

[0087] 2) Selection of accelerating stress

[0088] T1 is selected as 72℃, which is 342.15K.

[0089] 3) Test methods

[0090] Before the test, the battery was inspected for appearance and open circuit voltage. The test sample was placed in a temperature chamber and the temperature was raised to 72℃±2℃ for storage.

[0091] When the storage time is up, after restoring at room temperature for 2 hours, first check the appearance and open circuit voltage, then transfer the test sample to a low temperature chamber and conduct a discharge capacity test at a temperature of (0℃±2℃).

[0092] 2. The obtained lithium-manganese primary batteries were subjected to storage life tests, and the test methods are as follows:

[0093] 1) Before the test, check the appearance, open circuit voltage and internal resistance of the battery, and store the test sample in an environment of 25℃±3℃.

[0094] 2) Conduct annual inspections of the battery's appearance, open-circuit voltage, and internal resistance, and remove a portion of the battery for room temperature capacity testing.

[0095] III. Analysis of Test Results for Each Embodiment and Comparative Example

[0096] (1) Storage performance tests were conducted on Examples 1-3 and Comparative Examples 1-2. The test results are shown in Table 1 below.

[0097] Table 1 Results of accelerated storage tests for each example and comparative example

[0098]

[0099] As shown in Table 1, the lithium-manganese batteries prepared using the electrolytes in Examples 1-5 exhibited minimal changes in internal resistance and voltage difference before and after storage, indicating good battery condition. This demonstrates the good storage stability of the lithium-manganese batteries prepared using the electrolytes in Examples 1-5. In contrast, the lithium-manganese batteries in Comparative Examples 1-4 showed significant changes in internal resistance and voltage difference after accelerated storage tests, and the batteries also bulged. This indicates that the additives in this application, when used in various combinations, are more conducive to improving the long-term storage stability of lithium-manganese batteries and extending their storage life.

[0100] Figure 1 A comparison of the discharge curves of the lithium manganese battery prepared with the electrolyte in Example 2 before and after high-temperature accelerated storage (equivalent to 7 years of room temperature storage) shows that the battery capacity retention rate is 93% after storage, which is maintained at a high level.

[0101] (2) Storage life tests were conducted on Examples 1-5 and Comparative Examples 1-4. The test results are shown in Table 2 below.

[0102] Table 2. Experimental data on the storage life of lithium-manganese batteries prepared with the electrolyte in Example 5.

[0103]

[0104] As can be seen from Table 2, the lithium manganese battery made using the electrolyte in this application can still maintain a high battery capacity after long-term storage.

[0105] It should be noted that this application is not limited to the above-described embodiments. The above embodiments are merely examples, and any embodiments with the same structure and effect as the technical concept within the scope of this application are included in the technical scope of this application. Furthermore, various modifications that can be conceived by those skilled in the art to the embodiments, and other ways of constructing by combining some of the constituent elements of the embodiments, without departing from the spirit of this application, are also included in the scope of this application.

Claims

1. A lithium manganese battery electrolyte, characterized in that, The electrolyte comprises lithium salt, organic solvent, and additives, wherein the additives include one or more of the following: organosilicon source, toluenesulfonyl isocyanate, 1,3-propanesulfonate lactone, 1,4-butanesulfonate lactone, and triphenyl phosphite, and the additives account for 2% to 5% of the total mass of the electrolyte. The additives include an organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate, wherein the mass ratio of the organosilicon source, 1,3-propanesulfonate lactone, and toluenesulfonyl isocyanate is 6:(2~3):(1~2). Alternatively, the additive may include toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone, and triphenyl phosphite, wherein the mass ratio of toluenesulfonyl isocyanate, 1,4-butanesulfonate lactone, and triphenyl phosphite is 6:(1~3):(1~3).

2. The lithium manganese battery electrolyte according to claim 1, characterized in that, The organosilicon source includes one or more of methyl orthosilicate, ethyl orthosilicate, and propyl orthosilicate.

3. The lithium manganese battery electrolyte according to claim 1, characterized in that, The lithium salt includes one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium bis(trifluoromethanesulfonyl)imide, and lithium difluorosulfonylimide.

4. The lithium manganese battery electrolyte according to claim 1, characterized in that, The concentration of the lithium salt in the organic solvent is 1~2 mol / L.

5. The lithium manganese battery electrolyte according to claim 1, characterized in that, The organic solvent includes one or more of dimethyl carbonate, vinylene carbonate, ethylene carbonate, propylene carbonate, methyl ethyl carbonate, tetrahydrofuran, and sulfolane.

6. The method for preparing the lithium manganese battery electrolyte according to any one of claims 1 to 5, characterized in that, The process includes the following steps: lithium salt is added to an organic solvent and mixed evenly, then additives are added, the mixture is stirred and dispersed under heating conditions, and the electrolyte is obtained after cooling.

7. The method for preparing the lithium manganese battery electrolyte according to claim 6, characterized in that, The heating temperature is 50~60℃.

8. A lithium manganese battery, characterized in that, The lithium manganese battery electrolyte includes any one of claims 1 to 5.

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