Power lithium ion battery electrolyte and power lithium ion battery

A power battery and electrolyte technology, applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problem of affecting power output characteristics and low temperature output characteristics of power batteries, cannot meet the requirements of long cycle life of power batteries, and cannot form stable SEI protection Film and other problems, to achieve the effect of improving power characteristics and low temperature performance, improving charge and discharge efficiency, and improving output power characteristics

Inactive Publication Date: 2016-11-09
GUANGZHOU TINCI MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Additives such as VC (vinylene carbonate) and PS (1,3-propane sultone), which are commonly used at this stage, are applied to power batteries, and the SEI film formed has a large impedance, and it is easy to affect the power when the amount is high. Battery

Method used

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  • Power lithium ion battery electrolyte and power lithium ion battery
  • Power lithium ion battery electrolyte and power lithium ion battery
  • Power lithium ion battery electrolyte and power lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Electrolyte preparation steps: In a glove box filled with argon, mix ethylene carbonate, diethyl carbonate and ethyl methyl carbonate according to the mass ratio of EC:DEC:EMC=3:2:5, and then add to the mixed solution Slowly add lithium hexafluorophosphate with a concentration of 1.0mol / L, and finally add 0.3wt% lithium difluorophosphate (LiPO 2 f 2 ), 2wt% lithium difluorosulfonyl imide (LiFSI), 1wt% vinyl sulfate (DTD), 0.5wt% vinylene carbonate (VC), and stir evenly to obtain the lithium-ion battery electrolyte of Example 1.

[0027] Inject the lithium-ion battery electrolyte prepared in the above steps into the fully dried 4.20V graphite / LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 For power batteries (energy density>200Wh / kg), after the battery has been shelved at 45°C, formed in a high-temperature fixture and sealed twice, it is routinely divided.

[0028] 1) Cycling performance test at room temperature: At 25°C, charge the divided battery to 4.20V at 1C constant current and...

Embodiment 2～9

[0034] Embodiment 2~9 and comparative example 1~6

[0035]In Examples 2-9 and Comparative Examples 1-6, except that the composition and content of the electrolyte solvent and additives are added as shown in Table 1, the others are the same as in Example 1. Table 1 shows the contents of some components of the electrolyte and battery performance test results of Examples 1-9 and Comparative Examples 1-6:

[0036]

[0037]

[0038] Table 1

[0039] In the above Table 1, the abbreviated names of each chemical substance are as follows:

[0040] EC (ethylene carbonate), PC (propylene carbonate), DEC (diethyl carbonate), EMC (ethyl methyl carbonate), LiPO 2 f 2 (Lithium difluorophosphate), LiFSI (lithium bisfluorosulfonyl imide), LiDFOB (lithium difluorooxalate borate), DTD (ethylene sulfate), MMDS (methylene disulfonate), OT (ethylene disulfonate) Disulfonic anhydride, CAS: 4378-87-4), VC (vinylene carbonate), PS (1,3-propane sultone), LiBOB (lithium bisoxalate borate).

...

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Abstract

The invention discloses power lithium ion battery electrolyte and a power lithium ion battery. The power lithium ion battery electrolyte is prepared from a non-aqueous organic solvent, lithium salt, an additive A and an additive B, wherein the additive A is selected from at least one of difluoro lithium phosphate, difluoro sulfimide lithium and lithium difluoroborate, and the additive B is selected from at least one sulfide which has a first structural formula or a second structural formula or a third structural formula. According to the power lithium ion battery electrolyte, the additive A or the additive B with low impedance is blended, meanwhile, the dosages of high-impedance additives including vinylene carbonate, 1,3-propane sultone and the like are controlled, and an SEI (Solid Electrolyte Interface) membrane with low impendence and a stable structure can be formed on the surface of an electrode; the prepared power lithium ion battery has the advantages of long cycle life, high energy density, high output power, good low-temperature performance and the like.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a lithium ion power battery electrolyte and a lithium ion power battery. Background technique [0002] Due to the advantages of high working voltage, high energy density, long life and environmental friendliness, lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, aerospace and other fields. Especially in the field of electric vehicles, it has shown explosive growth since 2015. According to the national "Energy Saving and New Energy Automobile Industry Development Plan", the energy density of power batteries is required to reach more than 300Wh / Kg by 2020. [0003] As a means of transportation, electric vehicles are the focus of attention on their mileage, acceleration performance, climbing ability and safety performance. These aspects mainly depend on the performance of the power battery as a key component. With the technical devel...

Claims

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Application Information

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IPC IPC(8): H01M10/0525H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 吕家斌仰永军潘立宁胡巍曾庆鹏万华平
Owner GUANGZHOU TINCI MATERIALS TECH
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