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Lithium-rich manganese-based lithium ion battery high-voltage electrolyte additive, electrolyte, lithium battery and preparation method of lithium battery

An electrolyte additive, lithium-rich manganese-based lithium technology, applied in lithium-rich manganese-based lithium-ion battery high-voltage electrolyte additive, electrolyte, lithium battery and its preparation field, can solve the irreversible capacity fading of lithium-rich manganese-based positive electrode materials, Interfacial impedance increase, battery performance deterioration and other problems, to avoid the effect of battery performance deterioration

Active Publication Date: 2020-06-19
湖南法恩莱特新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the charge-discharge cycle, transition metal ions will be mixed in the lithium-rich manganese material, that is, the Li layer is occupied by other metal ions, resulting in a transformation from a layered structure to a spinel structure, which not only increases the Li + Kinetics of migration, and reduced Li + The position of intercalation / extraction leads to serious irreversible capacity fading for the first time in lithium-rich manganese-based cathode materials, and the cycle stability and rate performance are not ideal.
[0005] For high-voltage electrolytes, although increasing the operating voltage of the battery can increase the energy density, when the operating voltage exceeds 4.3 V, the currently used electrolyte will undergo severe oxidation and decomposition, resulting in an increase in the interfacial impedance between the electrode / electrolyte. Battery performance deteriorates, so high-voltage electrolyte is the core of building a high-voltage lithium-ion battery system

Method used

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  • Lithium-rich manganese-based lithium ion battery high-voltage electrolyte additive, electrolyte, lithium battery and preparation method of lithium battery
  • Lithium-rich manganese-based lithium ion battery high-voltage electrolyte additive, electrolyte, lithium battery and preparation method of lithium battery
  • Lithium-rich manganese-based lithium ion battery high-voltage electrolyte additive, electrolyte, lithium battery and preparation method of lithium battery

Examples

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Effect test

Embodiment 1

[0041] This example provides a high-voltage electrolyte additive for lithium-rich manganese-based lithium-ion batteries. The raw materials for the preparation include fluoroethylene carbonate, 1,3-propane sultone, phenylvinyl sulfone and boric acid tris(2,2,2 -trifluoroethyl) ester.

[0042] Among them, the mass ratio of fluoroethylene carbonate, 1,3-propane sultone, phenylvinyl sulfone and tris(2,2,2-trifluoroethyl) borate is (1~5): (0.5 ~2): (0.5~1.5): (0.1~1), preferably 8:2:2:1.

Embodiment 2

[0044] This example provides a high-voltage electrolyte solution for a lithium-rich manganese-based lithium-ion battery, which contains the electrolyte additive, lithium salt and solvent of Example 1.

[0045] Among them, the proportion of the electrolyte additive in the electrolyte is 3-10 wt%. Specifically, in the electrolyte, the proportion of fluoroethylene carbonate is 1-5 wt%. The proportion of 1,3-propane sultone is 0.5~2 wt%. The proportion of PVS is 0.5~1.5wt%. The proportion of TTFEB is 0.1~1 wt%.

[0046]The proportion of lithium salt in the electrolyte is 12-14 wt%. The lithium salt is lithium hexafluorophosphate. The concentration of lithium hexafluorophosphate is preferably 1.2 mol / L.

[0047] The solvent accounts for 60-90 wt% in the electrolyte. The solvent is a mixture of ethyl methyl carbonate and ethylene carbonate, and the mass ratio is preferably 11:5. Specifically, the proportion of ethyl methyl carbonate in the electrolyte is 45-60 wt%. The propo...

Embodiment 3

[0049] This example provides a method for preparing a high-voltage electrolyte for lithium-rich manganese-based lithium-ion batteries. The preparation method is as follows: adding lithium salt and electrolyte additives to the solvent in sequence.

[0050] When the lithium salt is added to the solvent, the ambient temperature is -5°C~5°C.

[0051] The preparation method of lithium-rich manganese-based lithium-ion battery high-voltage electrolyte, the specific process is: purification → mixing → deployment → filling.

[0052] Wherein, the purification process is to purify the solvent, and use the adsorption of molecular sieves to control the moisture content of the solvent below 5 ppm. In the mixing process, the two solvents are mixed at a pressure of 0.02-0.08 MPa, and the water content of the mixed solvent is kept below 6 ppm by keeping the airtightness of the reaction vessel. The blending process is to add lithium salt and additives to the solvent, and the lithium salt is fe...

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Abstract

The invention provides a lithium-rich manganese-based lithium ion battery high-voltage electrolyte additive, an electrolyte, a lithium battery and a preparation method of the lithium battery. The electrolyte additive is prepared from the following preparation raw materials: fluoroethylene carbonate, 1, 3-propane sultone, phenyl vinyl sulfone and boric acid tri (2, 2, 2-trifluoroethyl) ester. The requirements of electrolyte on multiple aspects of working temperature range, conductivity and the like can be met. According to the high-voltage electrolyte of the lithium-rich manganese-based lithiumion battery, the content of a high-melting-point solvent EC (the melting point is 35 to 38 DEG C) commonly used in the market is reduced; the content of a low-melting-point cosolvent EMC (the meltingpoint is -55 DEG C) is increased; the working temperature range of the electrolyte is greatly widened; and the problems that the first irreversible capacity of a lithium-rich manganese-based positiveelectrode material is seriously attenuated, and the cycling stability and the rate capability are not ideal are solved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a high-voltage electrolyte additive for a lithium-rich manganese-based lithium ion battery, an electrolyte, a lithium battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, good cycle performance, long storage time, and small self-discharge. They are widely used in 3C electronic products, portable electronic devices, electric vehicles, and aerospace fields, and are expected to gradually replace traditional energy storage devices such as lead Acid, NiCd and NiMH batteries. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, electrolytes and separators. At present, more positive electrode materials have been studied, including manganese-based, nickel-based, cobalt-based and vanadium-based. [0003] For the development of a n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/4235H01M2300/0025Y02E60/10
Inventor 邵俊华孔东波李海杰张利娟闫国锋王亚洲王郝为侯红歧杜珍郭飞谢佳庆
Owner 湖南法恩莱特新能源科技有限公司
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