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A lithium-rich manganese-based lithium battery high-voltage electrolyte additive and preparation method thereof

An electrolyte additive, lithium-rich manganese-based lithium technology, applied in the field of lithium batteries, can solve the problems of irreversible capacity decay, increase in interface impedance, and increase in kinetics of lithium-rich manganese-based cathode materials, and achieve the effect of avoiding deterioration of battery performance.

Active Publication Date: 2020-09-11
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

AI Technical Summary

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 working voltage of the battery can increase the energy density, when the working voltage exceeds 4.3V, the currently used electrolyte will undergo severe oxidation and decomposition, resulting in an increase in the interface 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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  • A lithium-rich manganese-based lithium battery high-voltage electrolyte additive and preparation method thereof
  • A lithium-rich manganese-based lithium battery high-voltage electrolyte additive and preparation method thereof

Examples

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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, phenyl vinyl 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] Wherein, the proportion of the electrolyte additive in the electrolyte is 3-10 wt%. Specifically, in the electrolyte solution, the proportion of fluoroethylene carbonate is 1-5 wt%. The proportion of 1,3-propane sultone is 0.5-2wt%. The proportion of PVS is 0.5 to 1.5 wt%. The proportion of TTFEB is 0.1-1 wt%.

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

[0047]The proportion of the solvent in the electrolytic solution is 60-90wt%. 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 el...

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 to 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 under 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...

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Abstract

The invention provides a lithium-rich manganese-based lithium battery high-voltage electrolyte additive and a preparation method thereof. The raw materials for the electrolyte additive include: fluoroethylene carbonate, 1,3-propane sultone, phenylvinyl sulfone and tris(2,2,2-trifluoroethyl) borate. It can meet various requirements such as the working temperature range and conductivity of the electrolyte. The above high-voltage electrolyte for lithium-rich manganese-based lithium-ion batteries reduces the content of the commonly used high-melting solvent EC (melting point 35-38°C) on the market, and increases the content of the low-melting co-solvent EMC (melting point-55°C). The working temperature range of the electrolyte is greatly widened. It solves the problems of severe first irreversible capacity fading and unsatisfactory cycle stability and rate performance of lithium-rich manganese-based cathode materials.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a high-voltage electrolyte additive for a lithium-rich manganese-based 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 new generation of high-performance lithium-ion batte...

Claims

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Application Information

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Patent Type & Authority Patents(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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