Lithium-rich manganese-based cathode material system battery electrolyte and lithium-ion battery

A lithium-rich manganese-based lithium, ion battery technology, applied in secondary batteries, secondary battery repair/maintenance, circuits, etc., can solve problems such as poor cycle performance, achieve good conductivity, reduce battery impedance, and improve composition. Effect

Active Publication Date: 2022-04-19
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The present invention mainly aims at the problem that the lithium-ion battery of the lithium-rich manganese-based positive electrode material system has poor cycle performance at a high voltage greater than 4.8V, and provides a method that can improve the first efficiency and high-voltage high-temperature performance of the lithium-ion battery of the lithium-rich manganese-based positive electrode material system. Electrolyte solutions for cycle performance

Method used

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preparation example Construction

[0044] According to some embodiments of the present invention, the preparation method of the lithium-rich manganese-based cathode material system battery electrolyte as described above, the preparation method includes the following steps:

[0045] S1: Add the electrolyte lithium salt into the solvent, stir to completely dissolve the lithium salt, and obtain a lithium salt solution;

[0046] S2: Add additives to the above lithium salt solution, and mix uniformly to obtain the lithium-rich manganese-based positive electrode material system battery electrolyte.

[0047] Preferably, the solvent is purified. The purification refers to the removal of impurities and water from the solvent, preferably through molecular sieves and activated carbon. Described molecular sieve can adopt type, type or type.

[0048] According to some embodiments of the present invention, the dissolution temperature of the electrolyte lithium salt in the organic solvent is 10-20°C.

[0049] The sel...

Embodiment 1

[0055] In this embodiment, the electrolytic solution provided comprises ethylene carbonate (EC), ethyl methyl carbonate (EMC), diethyl carbonate (DEC) mixed organic solvent, lithium salt is LiPF6, additive is fluoroethylene carbonate ( FEC), thiophene-2-methoxypinacol borate (TMBP), bis(2,2,2-trifluoroethyl)carbonate (FDEC).

[0056] The preparation method of the electrolyte is: in a glove box with a moisture content of less than 10ppm, mix the organic solvent uniformly according to the mass fraction EMC:EC:DEC=5:3:2, dry, remove water and impurities, and add refined electrolyte lithium Salt LiPF 6 Prepare a solution with a lithium salt concentration of 1mol / L, stir and mix well, then add 3% fluoroethylene carbonate (FEC), 0.5% thiophene-2 - Methoxyboronic acid pinacol ester (TMBP) and 1.0% bis(2,2,2-trifluoroethyl)carbonate (FDEC), fully stirred and mixed uniformly to prepare an electrolyte solution.

Embodiment 2

[0058] Different from Example 1, the sum of the mass of solvent and lithium salt is 100%, the addition of thiophene-2-methoxyboronic acid pinacol ester (TMBP) is 0.3%, bis(2,2,2 - The addition amount of trifluoroethyl) carbonate (FDEC) is 2.0%; All the other are identical with embodiment 1.

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Abstract

The invention provides an electrolyte solution for a lithium-rich manganese-based positive electrode material system battery and a lithium ion battery. The electrolyte solution includes a solvent, an electrolyte lithium salt and an additive, and the additive includes fluoroethylene carbonate, thiophene-2-methoxy boronic acid pinacol ester and bis(2,2,2-trifluoroethyl) carbonate. The electrolyte solution of the invention is applied to the lithium-rich manganese-based lithium ion battery, which can improve the interface compatibility between the electrolyte solution and the positive and negative electrodes, and improve the high-temperature and high-pressure cycle performance of the lithium-ion battery. Moreover, the preparation method is simple, easy to industrialize, and has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of lithium-ion batteries, in particular to an electrolyte solution for a lithium-rich manganese-based cathode material system battery and a lithium-ion battery. Background technique [0002] Lithium-ion battery electrolyte is an important part of lithium-ion batteries. Traditional lithium-ion battery materials use lithium cobalt oxide for the positive electrode and graphite for the negative electrode. The way to increase the energy density of this type of lithium-ion battery is usually by increasing the battery’s The high working voltage will lead to rapid decomposition of the electrolyte and damage to the structure of the lithium cobaltate material, which will greatly reduce the cycle life of the battery and make it difficult to meet the needs of actual use. A large number of studies have confirmed that one of the most effective ways to develop high-energy-density lithium-ion batteries is to use higher-capa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/0567H01M10/42H01M10/0525
CPCH01M10/0567H01M10/4235H01M10/0525Y02E60/10
Inventor 邹志群余意
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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