CN109244543B - Lithium ion battery electrolyte and lithium ion battery - Google Patents
Lithium ion battery electrolyte and lithium ion battery Download PDFInfo
- Publication number
- CN109244543B CN109244543B CN201811314528.0A CN201811314528A CN109244543B CN 109244543 B CN109244543 B CN 109244543B CN 201811314528 A CN201811314528 A CN 201811314528A CN 109244543 B CN109244543 B CN 109244543B
- Authority
- CN
- China
- Prior art keywords
- electrolyte
- ion battery
- lithium
- lithium ion
- carbonate
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
- H01M10/0567—Liquid materials characterised by the additives
-
- 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
-
- 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
Abstract
In order to overcome the problem of poor effect of reducing water and free acid in the lithium ion battery electrolyte in the prior art, the lithium ion battery electrolyte comprises an organic solvent, lithium salt and a polymer additive, wherein the polymer additive comprises a copolymer or a homopolymer of aryl-containing diisocyanate. Meanwhile, the invention also provides a lithium ion battery adopting the electrolyte. The lithium ion battery adopting the electrolyte provided by the invention has low moisture and free acid content, stable cycle performance at 45 ℃, no ballooning when stored in a 60 ℃ oven, small internal resistance change and good storage performance and cycle performance.
Description
Technical Field
The invention relates to a lithium ion battery electrolyte capable of reducing moisture and acidity and a lithium ion battery adopting the lithium ion battery electrolyte.
Background
Lithium battery electrolytes are carriers for ion transport in lithium batteries. The electrolyte plays a role in conducting ions between the positive electrode and the negative electrode of the lithium battery, and is a guarantee for the lithium battery to obtain the advantages of high voltage, high specific energy and the like. The electrolyte is prepared from high-purity organic solvent, electrolyte lithium salt, necessary additives and other raw materials according to a certain proportion under a certain condition. The most mature lithium salt currently used in commercial lithium ion battery production is lithium hexafluorophosphate (LiPF)6) The solvents are mainly carbonates, such as: ethylene Carbonate (EC), Propylene Carbonate (PC), dimethyl carbonate (DMC), etc., and a small amount of additive is mainly used to improve the overall performance of the electrolyte.
The moisture and acidity in the lithium ion battery electrolyte are always important factors influencing the quality of the electrolyte, which influence the capacity, safety performance and cycle life of the battery and restrict the development and application of the lithium ion battery. The existence of moisture in the electrolyte can shorten the quality guarantee period of the electrolyte and the stability of the electrolyte, and on the other hand, the water can react with lithium hexafluorophosphate in the electrolyte irreversibly to generate hydrofluoric acid and lithium fluoride, and the generated hydrofluoric acid can corrode a current collector to influence the transmission performance of the battery. The generated lithium fluoride can play a role in blocking a solid electrolyte interface film (SEI film) formed on the surface of the negative electrode, so that the polarization internal resistance of the battery is increased, the insertion and extraction of lithium ions of the negative electrode are influenced, and the cycle life of the battery is shortened.
In the prior art, hexamethyldisilazane is added to reduce the contents of moisture and free acid in the electrolyte, but the effect is not ideal.
Disclosure of Invention
The invention aims to solve the technical problem that the effect of reducing water and free acid in the lithium ion battery electrolyte is poor in the prior art, and provides the lithium ion battery electrolyte.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a lithium ion battery electrolyte comprising an organic solvent, a lithium salt, and a polymer additive comprising a copolymer or homopolymer of an aryl-containing diisocyanate.
Meanwhile, the invention also provides a lithium ion battery adopting the lithium ion battery electrolyte.
The inventor finds that hydrofluoric acid generated in the electrolyte is a medium strong acid and is easy to react with alkali, so that some alkali is added into the electrolyte to neutralize partial acid so as to achieve the purpose of reducing acidity, and the hydrofluoric acid is generally called as an acid inhibiting additive. Such as early amines like tributylamine, triethylamine, and the like, later carbodiimides, Hexamethyldisilazane (HMDS), heptamethyldisiminosilane (H7DMS), hexamethyldisilazane lithium, and the like. The ability to suppress acidity and, by the way, beneficial effects such as manganese dissolution under acidic conditions has been inhibited, and a range of applications for such additives have been reported in the literature. However, the above-mentioned various compounds have a limited effect of removing water or acid, and after reacting with acid, they generate substances insoluble in a nonaqueous solvent, resulting in precipitation, thereby affecting the overall performance of the battery.
The inventor finds that when the copolymer or the homopolymer of the aryl-containing diisocyanate is added into the electrolyte, the water in the electrolyte can be reduced, the water is prevented from being converted into free acid, the acidity caused by lithium salt can be prevented, and precipitates influencing the performance of the battery can not be generated.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more apparent, the present invention is further described in detail below with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The lithium ion battery electrolyte provided by the invention comprises an organic solvent, a lithium salt and a polymer additive, wherein the polymer additive comprises a copolymer or a homopolymer of diisocyanate containing aryl.
The polymer additive can be obtained by copolymerization or homopolymerization of diisocyanate containing aryl. Preferably, the polymer additive is a homopolymer of an aryl group-containing diisocyanate, and more preferably, the polymer additive is one or more selected from the group consisting of a polyethylene glycol-methyl ether-terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer, a polyglycerol-ethyl ether-terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer, and a polyethylene glycol-ethyl ether-terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer. The above-mentioned compounds are available by the home-made or commercial method.
In the present invention, the content of the polymer additive in the electrolyte can vary widely, and preferably, the content of the polymer additive in the electrolyte is 0.01 to 0.2%, and preferably 0.05 to 0.1%, based on the total weight of the electrolyte.
According to the embodiment of the invention, 0.05-0.1% of the polymer additive is added, so that the water content of the electrolyte can be effectively reduced, the increase of acidity can be inhibited, the storage performance of the electrolyte of the lithium ion battery can be improved, and the high-temperature cycle performance and the high-temperature storage performance of the battery can be effectively improved. When the content of the above-mentioned polymer additive is less than 0.05%, its improving effect on the removal of water and the reduction of acidity of the electrolyte is reduced; when the content is more than 0.1%, the film formation at the electrode interface is easily thick, the battery impedance is increased, and the battery performance is deteriorated.
In order to improve the comprehensive performance of the electrolyte, the lithium ion battery electrolyte provided by the invention also comprises one or more of vinylene carbonate, 1, 3-propane sultone, vinyl sulfate and lithium difluorophosphate. The various additives can be selectively added according to actual conditions, and the content of the vinylene carbonate in the electrolyte is 0-3% by mass, preferably 0.1-3% by mass based on the total weight of the electrolyte. The content of the 1, 3-propane sultone in percentage by mass is 0-3%, preferably 0.1-3%. The content of the vinyl sulfate is 0-3% by mass, and preferably 0.1-3% by mass. The mass percentage content of the lithium difluorophosphate is 0-3%, preferably 0.1-3%.
In the present invention, the organic solvent may be any one of the existing ones, and preferably, the organic solvent includes one or more of chain carbonates, cyclic carbonates, and carboxylic esters.
The chain carbonate is selected from one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate and methyl propyl carbonate.
The cyclic carbonate is selected from one or more of ethylene carbonate, propylene carbonate and fluoroethylene carbonate.
The carboxylic ester is selected from one or more of ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, formic acid propionate, ethyl propionate, n-propionic acid propionate, isopropyl propionate, methyl butyrate and ethyl butyrate.
In order to ensure better flame retardant effect, solvents with lower vapor pressure are preferred, cyclic carbonate with low vapor pressure is beneficial to flame retardant of electrolyte, such as ethylene carbonate, propylene carbonate and fluoroethylene carbonate are all preferred. Among the chain carbonates, diethyl carbonate is preferable. Among the carboxylic acid esters, n-propyl propionate, isopropyl propionate, and ethyl butyrate are preferable. Based on the total weight of the electrolyte, the content of a single solvent is adjustable within the range of 5-50 percent, and the content of different solvents can be the same or different.
The lithium salt is selected from one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluorophosphate, lithium difluorooxalato borate, lithium bis (oxalato) borate, lithium bis (fluorosulfonato) imide and lithium bis (trifluoromethanesulfonyl) imide; in the electrolyte, the concentration of the lithium salt is 0.5-2.5mol/L, preferably 0.8-1.5 mol/L based on the total weight of the electrolyte. Most commonly used is lithium hexafluorophosphate in the range of 1.0mol/L to 1.3 mol/L. Of course, the salts can also be used as auxiliary lithium salts, which are equivalent to additives and are used in amounts ranging from 0.1 to 5% by mass, more usually 0.5 to 3%.
In addition, the invention also provides a lithium ion battery, which comprises the lithium ion battery electrolyte.
As well known to those skilled in the art, the lithium ion battery includes a positive electrode, a separator, and a negative electrode in addition to the above-described electrolyte. In the present invention, preferably, the active material of the positive electrode is selected from LiCoO2、LiNiO2、LiMn2O4、LiCo1-yMyO2、LiNi1-yMyO2、LiMn2-yMyO4And LiNixCoyMnzM1-x-y-zO2Wherein M is selected from one or more of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V and Ti, y is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is less than or equal to 1.
As another aspect of the present invention, the active material of the positive electrode is selected from LiFe1-xMxPO4, wherein M is selected from one or more of Mn, Mg, Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and x is more than or equal to 0 and less than 1.
The following examples are presented to further illustrate the invention but are not intended to limit the process of the invention.
Example 1
This example illustrates the lithium ion battery electrolyte disclosed herein.
In a nitrogen-protected glove box (moisture)<1ppm, oxygen content<1ppm), mixing Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC) and diethyl carbonateThe ester (DEC) was mixed in a mass ratio of EC: EMC: DEC: 30:50:20, and lithium hexafluorophosphate (LiPF) was added6) And adding 1.5% of vinylene carbonate, 1% of lithium difluorophosphate and 0.05% of polyethylene glycol-methyl ether terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer according to the total mass of the electrolyte until the molar concentration is 1mol/L, and uniformly stirring to obtain the lithium ion battery electrolyte of the example 1.
Example 2
This example illustrates the lithium ion battery electrolyte disclosed herein.
In a nitrogen-protected glove box (moisture)<1ppm, oxygen content<1ppm), Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC), diethyl carbonate (DEC) were mixed in a mass ratio of EC: EMC: DEC: 30:50:20, and lithium hexafluorophosphate (LiPF) was added thereto6) And adding 1.5% of vinylene carbonate, 1% of lithium difluorophosphate and 0.1% of polyethylene glycol-methyl ether end-capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer according to the total mass of the electrolyte until the molar concentration is 1mol/L, and uniformly stirring to obtain the lithium ion battery electrolyte of the embodiment 2.
Comparative example 1
This comparative example is used to illustrate the lithium ion battery electrolyte disclosed by the present invention.
In a nitrogen-protected glove box (moisture)<1ppm, oxygen content<1ppm), Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC), diethyl carbonate (DEC) were mixed in a mass ratio of EC: EMC: DEC: 30:50:20, and lithium hexafluorophosphate (LiPF) was added thereto6) And adding 1.5 percent of vinylene carbonate and 1 percent of lithium difluorophosphate based on the total mass of the electrolyte into the electrolyte until the molar concentration is 1mol/L, and uniformly stirring the mixture to obtain the lithium ion battery electrolyte of the comparative example 1.
Comparative example 2
In a nitrogen-protected glove box (moisture)<1ppm, oxygen content<1ppm), Ethylene Carbonate (EC), Ethyl Methyl Carbonate (EMC), diethyl carbonate (DEC) were mixed in a mass ratio of EC: EMC: DEC: 30:50:20, and lithium hexafluorophosphate (LiPF) was added thereto6) To a molar concentration of 1mol/L, addingAnd uniformly stirring 1.5 percent of vinylene carbonate, 1 percent of lithium difluorophosphate and 0.02 percent of hexamethyldisilazane to obtain the lithium ion battery electrolyte of the comparative example 2 according to the total mass of the electrolyte.
Test item 1: moisture and acidity test of electrolyte
After a small amount of comparative examples 1 to 2 and examples 1 to 2 were taken from a glove box, the water content of 4 samples was measured by a karl fischer moisture meter; about 50mL of 4 samples were taken from the glove box and the acidity in the electrolyte was measured by ice water sodium hydroxide titration. The test results are shown in table 1.
TABLE 1
As can be seen from the data in table 1, the moisture and acidity of comparative example 2 are less than comparative example 1, while the moisture and acidity of examples 1 and 2 are significantly less than comparative example 2, indicating that while hexamethyldisilazane can function as both a precipitation and an acid removal, the polyethylene glycol-methyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer can remove moisture from the electrolyte and inhibit an increase in acidity in the electrolyte more effectively than the polyethylene glycol-methyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer.
Test item 2: storage test of electrolyte
The electrolytes of comparative examples 1 to 2 and examples 1 to 2 were separately dispensed into 250ml aluminum bottles, and then the samples were placed in an incubator at 25 ℃ and the water content and acidity of the samples were measured every 5 days. The test results are shown in table 2.
TABLE 2
As can be seen from the data of table 2, comparative example 1 showed a significant increase in both moisture and acidity after 15 days of storage, and comparative example 2 showed a relatively slow increase in moisture and acidity compared to comparative example 1, but did not fully function to remove water and inhibit acidity, indicating that hexamethyldisilazane did not function to inhibit long-term storage of the electrolyte. In examples 1-2, after 15 days of storage, neither acidity nor moisture of the electrolyte increased significantly, which indicates that the polyethylene glycol-methyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer can maintain the stability of the electrolyte for a long time and prolong the shelf life of the electrolyte.
Battery performance testing
The lithium battery electrolytes prepared in comparative example 1 and comparative example 2 and the lithium ion battery electrolytes prepared in examples 1 to 2 were respectively injected into positive electrodes of LiNi0.5Co0.2Mn0.3O2And (3) testing the battery in a soft package battery which is made of a ternary material and has an artificial graphite negative electrode, wherein the rated capacity of the battery is 1000 mAh.
Test item 3: test of ordinary temperature cycle Performance
The cell was placed in a constant temperature oven at a constant temperature of 25C, charged to 4.4V with a constant current of 1C and a constant voltage, and cut off at a current of 0.03C, and then discharged to 3.0V with a constant current of 1C. The discharge capacity at week 1 and the discharge capacity at week 500 were recorded after 500 cycles in this manner, and the capacity retention rate was calculated by the following formula.
Capacity retention (%) was (500 th-cycle discharge capacity/1 st-cycle discharge capacity) × 100%
The test results are shown in table 3.
Test item 4: high temperature cycle performance test
The test conditions were the same as those in test item 3 except that the temperature of the incubator was 45 ℃. The test results are shown in Table 3.
TABLE 3
From the data in Table 3, it can be seen that Ni is present in Ni, Co, MnxCoyMn(1-x-y)In the lithium ion battery with the ternary material as the anode and the graphite as the cathode, the contrast is higherExample 2 the capacity retention of the battery was less than that of comparative example 1 when the battery was cycled at both normal and high temperatures, and the cycling performance of the battery was significantly degraded when hexamethyldisilazane was added to the electrolyte, indicating that hexamethyldisilazane was included in the electrolyte and was detrimental to the cycling of the battery. When the lithium ion batteries prepared by the lithium ion battery electrolytes in the embodiments 1 and 2 are cycled at normal temperature and high temperature, the capacity retention rate of the batteries is remarkably improved and is obviously superior to that of the lithium ion batteries in the comparative example 1, which further illustrates that the polyethylene glycol-methyl ether terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer is beneficial to improving the cycle performance of the batteries.
Test item 5: high temperature storage test
The fully charged lithium ion batteries of examples 1 to 2 and comparative examples 1 to 2 were stored in an oven at 60 ℃ for 30 days, and the capacity, internal resistance, and thickness change of the batteries were measured.
The method comprises the steps of firstly charging and discharging the battery at the normal temperature for three times at 1C, recording the discharge capacity at the normal temperature as C1, fully charging the battery at the constant current and the constant voltage of 1C, testing the thickness D1 and the internal resistance R1 of the battery at the full charge state, and carrying out a high-temperature (60 ℃) storage test on the battery at the full charge state, wherein the cut-off current is 0.03C. After the storage for 30 days, testing the thickness D2 and the internal resistance R2 of the battery again after the battery is completely cooled; the taken out battery is charged and discharged according to the following modes: the 1C was discharged at constant current to a final voltage of 3V, and the discharge capacity was recorded as C2. The 1C constant current and constant voltage charging is carried out to 4.2V, and the cutoff current is 0.03C. Standing for 5 min. The 1C was discharged at constant current to a final voltage of 3V, and the discharge capacity was recorded as C3. The capacity retention rate, capacity recovery rate and internal resistance increase rate after high-temperature storage were calculated according to the following formulas.
After high-temperature storage, the capacity retention rate is C2/C1 × 100%, the capacity recovery rate is C3/C1 × 100%, and the internal resistance increase rate is (R2-R1)/R1 × 100%.
The test results are shown in table 4.
TABLE 4
From the data in table 4, after being stored at a high temperature of 60 ℃ for 30 days, the capacity retention rate and the capacity recovery rate of the comparative example 2 are both smaller than those of the comparative example 1, and the internal resistance increase rate is larger than that of the comparative example 1, which indicates that the storage performance of the battery is reduced due to hexamethyldisilazane, whereas the capacity retention rate and the capacity recovery rate of the lithium ion batteries of the examples 1 and 2 are both significantly better than those of the comparative example 1 and the internal resistance increase rate of the lithium ion batteries of the examples 1 and 2 is smaller than that of the comparative example 1, which further indicates that the polyethylene glycol-methyl ether terminated 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer is beneficial to further improving the storage performance of the battery.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (11)
1. A lithium ion battery electrolyte comprising an organic solvent, a lithium salt and a polymer additive selected from one or more of polyethylene glycol-methyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer, polyglycerol-ethyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer, polyethylene glycol-ethyl ether capped 1, 3-bis (1-isocyanato-1-methylethyl) benzene homopolymer;
in the electrolyte, the content of the polymer additive is 0.01-0.2% by taking the total weight of the electrolyte as a reference.
2. The lithium ion battery electrolyte of claim 1, further comprising one or more of vinylene carbonate, 1, 3-propane sultone, vinyl sulfate, and lithium difluorophosphate.
3. The lithium ion battery electrolyte of claim 2, wherein the vinylene carbonate is present in the electrolyte in an amount of 0-3%, based on the total weight of the electrolyte; the content of the 1, 3-propane sultone is 0-3%; the content of the vinyl sulfate is 0-3%; the content of the lithium difluorophosphate is 0-3%.
4. The lithium ion battery electrolyte of claim 1, wherein the organic solvent comprises one or more of a chain carbonate, a cyclic carbonate, and a carboxylate.
5. The lithium ion battery electrolyte of claim 4, wherein the chain carbonate is selected from one or more of dimethyl carbonate, diethyl carbonate, ethyl methyl carbonate, and propyl methyl carbonate;
the cyclic carbonate is selected from one or more of ethylene carbonate, propylene carbonate and fluoroethylene carbonate;
the carboxylic ester is selected from one or more of ethyl acetate, n-propyl acetate, isopropyl acetate, n-butyl acetate, methyl propionate, ethyl propionate, n-propyl propionate, isopropyl propionate, methyl butyrate and ethyl butyrate.
6. The lithium ion battery electrolyte of claim 1, wherein the lithium salt is selected from one or more of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium difluorooxalato borate, lithium bis-oxalato borate, lithium bis-fluorosulfonyl imide, lithium bis (trifluoromethanesulfonyl) imide; in the electrolyte, the concentration of the lithium salt is 0.5-2.5mol/L based on the total weight of the electrolyte.
7. A lithium ion battery comprising the lithium ion battery electrolyte of any one of claims 1 to 6.
8. The lithium ion battery of claim 7, wherein the lithium ion battery comprises a positive electrode, a separator and a negative electrode, and the active material of the positive electrode is selected from LiMn2-yMyO4And LiNixCoyMnzM1-x-y-zO2One or more than two of the compounds shown, wherein M is selected fromFe. One or more of Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, wherein y is more than or equal to 0 and less than or equal to 1, x is more than or equal to 0 and less than or equal to 1, z is more than or equal to 0 and less than or equal to 1, and x + y + z is less than or equal to 1;
alternatively, the active material of the positive electrode is selected from LiFe1-xMxPO4Wherein M is selected from one or more of Mn, Mg, Co, Ni, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and x is more than or equal to 0 and less than 1.
9. The li-ion battery of claim 8, wherein the LiMn is2-yMyO4Is LiMn2O4。
10. The lithium ion battery of claim 8, wherein the LiNi isxCoyMnzM1-x-y-zO2Is LiCo1- yMyO2Or LiNi1-yMyO2(ii) a Wherein M is selected from one or more of Fe, Co, Ni, Mn, Mg, Cu, Zn, Al, Sn, B, Ga, Cr, Sr, V or Ti, and y is more than or equal to 0 and less than or equal to 1.
11. The li-ion battery of claim 10, wherein the LiCo1-yMyO2Is LiCoO2Said LiNi1-yMyO2Is LiNiO2。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314528.0A CN109244543B (en) | 2018-11-06 | 2018-11-06 | Lithium ion battery electrolyte and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811314528.0A CN109244543B (en) | 2018-11-06 | 2018-11-06 | Lithium ion battery electrolyte and lithium ion battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109244543A CN109244543A (en) | 2019-01-18 |
| CN109244543B true CN109244543B (en) | 2021-08-13 |
Family
ID=65077298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811314528.0A Active CN109244543B (en) | 2018-11-06 | 2018-11-06 | Lithium ion battery electrolyte and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109244543B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546218A (en) * | 2018-12-19 | 2019-03-29 | 珠海光宇电池有限公司 | A kind of silicon-carbon lithium-ion battery electrolytes and the silicon-carbon lithium ion battery using the electrolyte |
| WO2020135694A1 (en) * | 2018-12-29 | 2020-07-02 | 浙江省化工研究院有限公司 | Additive for battery electrolyte, and electrolyte and lithium ion battery using same |
| CN112510256B (en) * | 2019-09-16 | 2023-08-29 | 浙江省化工研究院有限公司 | Lithium ion battery electrolyte and lithium ion battery containing same |
| CN112510258A (en) * | 2019-09-16 | 2021-03-16 | 浙江省化工研究院有限公司 | Lithium ion battery electrolyte and lithium ion battery containing same |
| CN113717205A (en) * | 2020-05-26 | 2021-11-30 | 恒大新能源技术(深圳)有限公司 | Preparation method of lithium oxalate borate and derivatives thereof, electrolyte and secondary battery |
| CN114075226A (en) * | 2020-08-18 | 2022-02-22 | 恒大新能源技术(深圳)有限公司 | Preparation method of oxalato borate, oxalato borate derivative, preparation method of oxalato borate derivative and electrolyte salt |
| CN114497524B (en) * | 2020-10-28 | 2024-02-02 | 万华化学(四川)有限公司 | Preparation method of high-compaction high-cycle ternary positive electrode and lithium secondary battery |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04112460A (en) * | 1990-08-31 | 1992-04-14 | Honda Motor Co Ltd | Lithium secondary battery |
| CN1421953A (en) * | 2001-11-24 | 2003-06-04 | 三星Sdi株式会社 | Polymer electrolyte composition for improving overcharging security and lithium battery |
| CN101156263A (en) * | 2005-04-20 | 2008-04-02 | 株式会社Lg化学 | Lithium secondary battery having improved stability to overcharge |
| CN101826635A (en) * | 2010-04-09 | 2010-09-08 | 广州天赐高新材料股份有限公司 | Polymer electrolyte for lithium battery and manufacturing method of battery thereof |
| CN103000941A (en) * | 2012-11-29 | 2013-03-27 | 东莞新能源科技有限公司 | Formula of gel electrolyte and method for preparing gel electrolyte with formula |
| CN104364948A (en) * | 2012-07-05 | 2015-02-18 | 三洋化成工业株式会社 | Agent for forming electrode protection film |
| CN104966848A (en) * | 2015-06-19 | 2015-10-07 | 储盈新能源科技（上海）有限公司 | Polymer for lithium ion battery, preparation method of polymer, lithium ion battery gel electrolyte and preparation method thereof |
| CN107230800A (en) * | 2017-06-26 | 2017-10-03 | 深圳市沃特玛电池有限公司 | Electrolyte for lithium ion battery and lithium ion battery |
-
2018
- 2018-11-06 CN CN201811314528.0A patent/CN109244543B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04112460A (en) * | 1990-08-31 | 1992-04-14 | Honda Motor Co Ltd | Lithium secondary battery |
| CN1421953A (en) * | 2001-11-24 | 2003-06-04 | 三星Sdi株式会社 | Polymer electrolyte composition for improving overcharging security and lithium battery |
| CN101156263A (en) * | 2005-04-20 | 2008-04-02 | 株式会社Lg化学 | Lithium secondary battery having improved stability to overcharge |
| CN101826635A (en) * | 2010-04-09 | 2010-09-08 | 广州天赐高新材料股份有限公司 | Polymer electrolyte for lithium battery and manufacturing method of battery thereof |
| CN104364948A (en) * | 2012-07-05 | 2015-02-18 | 三洋化成工业株式会社 | Agent for forming electrode protection film |
| CN103000941A (en) * | 2012-11-29 | 2013-03-27 | 东莞新能源科技有限公司 | Formula of gel electrolyte and method for preparing gel electrolyte with formula |
| CN104966848A (en) * | 2015-06-19 | 2015-10-07 | 储盈新能源科技（上海）有限公司 | Polymer for lithium ion battery, preparation method of polymer, lithium ion battery gel electrolyte and preparation method thereof |
| CN107230800A (en) * | 2017-06-26 | 2017-10-03 | 深圳市沃特玛电池有限公司 | Electrolyte for lithium ion battery and lithium ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109244543A (en) | 2019-01-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109244543B (en) | Lithium ion battery electrolyte and lithium ion battery | |
| US10826123B2 (en) | Lithium-ion battery electrolyte and lithium-ion battery | |
| CN103199302B (en) | Lithium rechargeable battery and electrolyte thereof | |
| US20110236768A1 (en) | Non-Aqueous Electrolyte Secondary Battery | |
| CN103384017B (en) | A kind of nonaqueous electrolytic solution of high-voltage lithium ion batteries | |
| US11387491B2 (en) | Electrolyte and secondary battery containing the same | |
| US10797348B2 (en) | Electrolyte and lithium-ion battery | |
| US20160036092A1 (en) | Lithium-ion battery and electrolyte thereof | |
| US20180076483A1 (en) | Non-aqueous electrolyte of lithium-ion battery and lithium-ion battery | |
| CN109742445B (en) | Bifunctional additive, electrolyte containing same and lithium ion battery | |
| US20190006704A1 (en) | Electrolyte and lithium-ion battery | |
| CN110611121A (en) | Electrolyte and lithium ion battery containing same | |
| US20220021028A1 (en) | Non-aqueous electrolyte for a lithium ion battery and a lithium ion battery | |
| CN114725512A (en) | Non-aqueous electrolyte and secondary battery | |
| US20240154115A1 (en) | Lithium-ion Battery | |
| CN114024030B (en) | Non-aqueous electrolyte and battery containing same | |
| US11489199B2 (en) | Non-aqueous electrolyte for lithium ion battery and lithium ion battery | |
| CN111384438B (en) | Lithium ion battery non-aqueous electrolyte and lithium ion battery | |
| KR101141056B1 (en) | Lithium Secondary Battery with Improved Cell Property | |
| CN109659611A (en) | A kind of lithium-ion battery electrolytes and lithium ion battery | |
| WO2022218145A1 (en) | Non-aqueous electrolyte and lithium-ion battery | |
| CN114927760A (en) | Non-aqueous electrolyte containing cyano aliphatic amine compounds, lithium ion battery and application thereof | |
| WO2022143190A1 (en) | Non-aqueous electrolyte and battery | |
| CN114566711A (en) | Electrolyte, preparation method thereof and high-nickel lithium ion battery containing electrolyte | |
| CN112490497A (en) | Non-aqueous electrolyte for lithium ion battery and lithium ion battery using same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |