High-nickel ternary lithium ion power battery electrolyte and high-nickel ternary lithium ion power battery

A power battery and electrolyte technology, applied in the field of lithium ion batteries, can solve the problems of high nickel battery safety performance to be improved, unfavorable high power output of lithium ion batteries, large impedance of methylene disulfonate, etc., so as to improve the battery Cycling performance, excellent film-forming properties on the surface of the negative electrode, and the effect of improving power safety performance

Inactive Publication Date: 2016-10-26
GUANGZHOU TINCI MATERIALS TECH
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The Chinese patent application publication number CN 104332650 A discloses a high-voltage electrolyte solution for a high-nickel ternary positive electrode material system lithium-ion battery, which contains methylene disulfonate and fluoroethylene carbonate, wherein the positive film-forming agent methane Methylene disulfonate has a large impedance, which is not conducive to the high power output of lithium-ion batteries, and the safety performance of high-nickel batteries needs to be improved.
In addition, in the existing patented technical solutions, wetting additives are rarely used to promote the kinetic transport process of lithium ions at the electrode interface

Method used

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  • High-nickel ternary lithium ion power battery electrolyte and high-nickel ternary lithium ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 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 ), 1wt% vinyl sulfate (DTD), 2wt% ethoxylated pentafluorocyclotriphosphazene, 0.5wt% vinylene carbonate (VC), and stir to obtain the lithium-ion battery electrolyte of Example 1.

[0030] Inject the prepared lithium-ion power battery electrolyte into the fully dried 4.20V graphite / LiNi 0.5 co 0.2 mn 0.3 o 2 Power battery (energy density>200Wh / kg) or 4.20V silicon carbon composite graphite / LiNi 0.8 co 0.15 al 0.05 o 2 For power batteries (energy density > 250Wh / kg), after the battery has been put on hold at 45°C, formed in a high-temperature fixture and sealed twice, it is routinely divided.

[0031] 1) Cycling perfo...

Embodiment 2～10

[0037] Embodiment 2~10 and comparative example 1~6

[0038] In Examples 2-10 and Comparative Examples 1-6, except that the positive and negative electrode system of the battery and the functional additive composition of the electrolyte are added as shown in Table 1, the others are the same as in Example 1. Table 1 shows the battery positive and negative electrode systems, electrolyte functional additive composition and battery performance test results of Examples 1-10 and Comparative Examples 1-6:

[0039]

[0040]

[0041] Table 1

[0042] In the above Table 1, the abbreviated names of each chemical substance are as follows:

[0043] LiPO 2 f 2 (lithium difluorophosphate), DTD (ethylene sulfate), FEC (fluoroethylene carbonate).

[0044] figure 1 The comparison of the battery formation process capacity-voltage differential curves in Example 1 and Comparative Example 1 shows that: after adding DTD to the electrolyte in Example 1, it can be decomposed into a film in p...

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Abstract

The invention discloses a high-nickel ternary lithium ion power battery electrolyte and a high-nickel ternary lithium ion power battery. The electrolyte includes a non-aqueous organic solvent, a lithium salt, a conductive additive, a film forming additive and an infiltration additive, wherein the conductive additive is lithium difluorophosphate, the film forming additive is ethylene sulfate, and the infiltration additive is at least one of fluorophosphazene and fluoroethylene carbonate; and synergism and mutual promotion of the three additives makes an excellent SEI film be formed on the surface of an electrode and effectively promotes all dynamic processes in the lithium ion battery. The power battery electrolyte has the advantages of good lithium ion transmission characteristic, good oxidation resistance, guaranteeing of high power characteristic and good cycle performances of the power battery, and high safety.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a high-nickel ternary lithium-ion power battery electrolyte and a high-nickel ternary 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0525H01M10/0567H01M2220/20Y02E60/10
Inventor 吕家斌仰永军潘立宁万华平胡巍曾庆鹏
Owner GUANGZHOU TINCI MATERIALS TECH
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