Anti-overcharge electrolyte of lithium-ion power battery and lithium-ion power battery

A power battery and lithium-ion technology, applied in the field of lithium-ion battery electrolyte, can solve problems affecting the long cycle life of the battery, overcharge additives lose performance, increase battery internal resistance, etc., to improve room temperature cycle performance and high temperature performance, improve Internal dynamic characteristics, the effect of reducing the negative electrode interface impedance

Inactive Publication Date: 2018-09-07
DONGGUAN SHANSHAN BATTERY MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used anti-overcharge additives (such as biphenyl, cyclohexylbenzene) can improve the overcharge safety of the battery to a certain extent, but the stability is poor during the long cycle of the battery, and it is easy to increase the internal resistance of the battery and affect the battery life. At the same time, when the battery is overcharged, this type of additive will irreversibly decompose and produce gas or electropolymerization. After the battery is overcharged, the overcharge additive will often lose its own performance.

Method used

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  • Anti-overcharge electrolyte of lithium-ion power battery and lithium-ion power battery
  • Anti-overcharge electrolyte of lithium-ion power battery and lithium-ion power battery
  • Anti-overcharge electrolyte of lithium-ion power battery and lithium-ion power battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Electrolyte preparation:

[0027] In a glove box filled with argon, ethylene carbonate, diethyl carbonate and ethyl methyl carbonate were mixed according to the mass ratio of EC:DEC:EMC=3:3:4, and then slowly added to the mixed solution based on the electrolyte 12.5% ​​lithium hexafluorophosphate by weight, 0.5% lithium difluorophosphate based on the total weight of the electrolyte and 2.5% lithium bisfluorosulfonyl imide based on the total weight of the electrolyte, finally adding 0.5wt% based on the total weight of the electrolyte. Methylsilane) borate (TMSB), 2wt% vinyl sulfate (DTD), 0.5wt% vinylene carbonate (VC) and 2wt% 2,5-di-tert-butyl-1,4-dimethoxy Benzene was stirred evenly to obtain the lithium-ion battery electrolyte of Example 1.

[0028] Preparation of lithium-ion power battery:

[0029] Stack the prepared positive electrode sheet, separator, and negative electrode sheet in order, so that the separator is in the middle of the positive and negative elect...

Embodiment 2～12

[0030] Embodiment 2~12 and comparative example 1~5

[0031] In Examples 2-12 and Comparative Examples 1-5, except that the composition ratio of the components of the electrolyte solution is added as shown in Table 1, the others are the same as in Example 1. In addition, see Table 2 for specific substance descriptions of the structural formula (I) in each embodiment.

[0032] Table 1 Embodiment 1~12 and the composition ratio of each component of the electrolyte solution of comparative examples 1~5

[0033]

[0034]

[0035]

[0036] Structural formula (I) concrete material explanation in the embodiment of table 2

[0037]

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Abstract

The invention belongs to the technical field of lithium ion battery electrolytes, and in particular relates to an anti-overcharge electrolyte of a lithium-ion power battery and a lithium-ion power battery, wherein the electrolyte comprises electrolyte lithium salt, a non-aqueous organic solvent, a film-forming additive and an anti-overcharge additive, wherein the film-forming additive is at leastone of tris (trimethylsilane) borate and ethylene sulfate; the anti-overcharge additive is provided with an aromatic compound with a structure (I) formula. The anti-overcharge additive disclosed by the invention does not participate in any reaction process when the battery is at a normal working voltage of (3.0-4.3V); when the charging voltage of the battery exceeds 4.45V, the anti-overcharge additive generates redox flying shuttle shunt voltage limitation on the surface of the electrode to clamp the voltage within a certain range, so as to prevent the internal electrolyte of the battery fromviolently decomposing to generate heat and gas due to excessively high voltage, and further to avoid the battery from the safety problems such as burning, explosion and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery electrolytes, and in particular relates to a lithium-ion power battery anti-overcharge electrolyte and a lithium-ion power battery. Background technique [0002] Lithium-ion batteries are widely used in 3C digital products, power tools, electric vehicles, energy storage equipment and other fields due to their advantages such as high working voltage, high energy density, long life and environmental friendliness. [0003] As a means of transportation, electric vehicles have mileage, acceleration performance, climbing ability and safety performance, etc., which are the focus of attention, and the level of these performance indicators mainly depends on the power battery as a key component. In order to meet the higher energy density requirements of power batteries in the above plan, one is to continuously increase the nickel content in positive electrode materials, such as NCM622, NCM811, N...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0568H01M10/0525
CPCH01M10/0525H01M10/0567H01M10/0568H01M2220/20H01M2300/0025Y02E60/10
Inventor 潘立宁黄慧聪朱学全郭力王建斌
Owner DONGGUAN SHANSHAN BATTERY MATERIALS
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