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Lithium ion battery non-aqueous electrolyte and lithium ion battery

A lithium-ion battery and non-aqueous electrolyte technology, applied in the field of lithium-ion battery non-aqueous electrolyte and lithium-ion battery, can solve the problems of high interface impedance, deteriorated low temperature performance, poor conductivity of passivation film, etc. Excellent low temperature performance and good compactness

Inactive Publication Date: 2017-01-18
SHENZHEN CAPCHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, scientific and technical workers in this field have found in their research that the passivation film formed by the three-bond phosphate additive at the electrode interface has poor conductivity, resulting in a large interface impedance, which significantly deteriorates the low-temperature performance, and is particularly easy to cause the battery to operate at low temperature. Under-charging lithium ion, inhibiting the application of non-aqueous lithium-ion batteries at low temperature

Method used

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  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery
  • Lithium ion battery non-aqueous electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The preparation method of the lithium-ion battery in this example includes a positive electrode preparation step, a negative electrode preparation step, an electrolyte preparation step, a diaphragm preparation step and a battery assembly step. details as follows:

[0054] The positive electrode preparation step is: mix the positive electrode active material LiNi according to the mass ratio of 96.8:2.0:1.2 0.5 co 0.2 mn 0.3 o 2 , conductive carbon black and binder polyvinylidene fluoride are dispersed in N-methyl-2-pyrrolidone to obtain positive electrode slurry, and the positive electrode slurry is evenly coated on both sides of the aluminum foil, after drying, calendering and Vacuum drying, and welding aluminum lead wires with an ultrasonic welder to obtain a positive plate, the thickness of the plate is between 120-150 μm.

[0055] Negative electrode preparation steps are: mix graphite, conductive carbon black, binder styrene-butadiene rubber and carboxymethyl cel...

Embodiment 2-20

[0076] In Examples 2-20, except that the specific compounds of the sulfone compound and the unsaturated phosphoric acid ester compound, and the amount thereof are different, the others are the same as in Example 1. The specific compounds of each embodiment and their dosage are shown in Table 2, wherein the dosage is calculated according to the percentage of each substance accounting for the total weight of the non-aqueous electrolyte of the lithium-ion battery.

[0077] In addition, the present application has also designed 6 comparative examples, i.e. comparative examples 1-6. Similarly, compared with Example 1 or other examples, the 6 comparative examples are only different in the specific compound and dosage added, and the others are all Same as Example 1. The specific compounds and their dosages of each comparative example are shown in Table 2. Similarly, the dosages are calculated according to the percentage of the added substances in the total weight of the non-aqueous ele...

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Abstract

The invention discloses a lithium ion battery non-aqueous electrolyte and a lithium ion battery. The lithium ion battery non-aqueous electrolyte comprises an unsaturated phosphate ester compound and a sulfone compound, and the sulfone compound comprises a cyclic sulfone compound and / or a linear sulfone compound; the unsaturated phosphate ester compound has a structure represented by formula 1; and the cyclic sulfone compound has a structure represented by formula 2, and the linear sulfone compound has a structure represented by formula 3. The non-aqueous electrolyte is characterized in that the unsaturated phosphate ester compound and the sulfone compound are simultaneously added to the electrolyte in order to form a protection film with the advantages of uniform components, moderate thickness and good compactness on an electrode interface; the unsaturated phosphate ester compound cooperates with the sulfone compound to make the electrolyte have good stability on a positive electrode in order to make the battery have excellent high-temperature performances and excellent cycle performances, and the unsaturated phosphate ester compound and the sulfone compound are combined to make the battery have low impedance in order to make the battery have excellent low-temperature performances. The electrolyte lays a foundation for the production of high-quality power batteries.

Description

technical field [0001] The present application relates to the field of lithium-ion battery electrolyte, in particular to a lithium-ion battery non-aqueous electrolyte and a lithium-ion battery. Background technique [0002] Compared with other batteries, lithium-ion batteries have the advantages of light weight, small size, high working voltage, high energy density, high output power, high charging efficiency, no memory effect and long cycle life. For 3C consumer electronics market. And with the development of new energy vehicles, non-aqueous electrolyte lithium-ion batteries are becoming more and more popular as the power supply system of vehicles. With the continuous improvement of the mileage requirements of new energy vehicles, there is an increasing demand for high energy density of power lithium-ion batteries. The ternary nickel-cobalt-manganese cathode material has become a research hotspot of cathode materials for new energy power batteries due to its high energy d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2300/0025Y02E60/10
Inventor 林木崇石桥曾长安
Owner SHENZHEN CAPCHEM TECH CO LTD
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