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Battery electrolyte additive, electrolyte containing additive and lithium ion battery

An electrolyte additive, lithium-ion battery technology, applied in the field of electrolytes and lithium-ion batteries

Pending Publication Date: 2020-07-07
ZHEJIANG RES INST OF CHEM IND CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these negative electrode film-forming additives can improve battery negative electrode cycle performance, there are still problems in improving high temperature and rate performance.

Method used

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  • Battery electrolyte additive, electrolyte containing additive and lithium ion battery
  • Battery electrolyte additive, electrolyte containing additive and lithium ion battery
  • Battery electrolyte additive, electrolyte containing additive and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Preparation of electrolyte

[0042]Mix ethylene carbonate (EC), diethyl carbonate (DEC) and ethyl methyl carbonate (EMC) according to the mass ratio of EC:DEC:EMC=3:2:5, and then add lithium hexafluorophosphate (LiPF 6 ), until the molar concentration of lithium hexafluorophosphate in the electrolyte is 1mol / L, then add 1% of compound 1 based on the total mass of the electrolyte. The structure of compound 1 is as follows:

[0043]

[0044] (2) Preparation of positive plate

[0045] Mix the positive electrode active material lithium nickel cobalt manganese oxide LiNi according to the mass ratio of 93:4:3 0.5 co 0.2 mn 0.3 o 2 Or lithium cobalt oxide LiCoO 2 , conductive carbon black Super-P and binder polyvinylidene fluoride (PVDF), and then disperse them in N-methyl-2-pyrrolidone (NMP) to obtain positive electrode slurry. The slurry is evenly coated on both sides of the aluminum foil, dried, calendered and vacuum-dried, and an aluminum lead-out wire is wel...

Embodiment 2

[0059] Change the mass content of Compound 1 in the electrolyte prepared in Example 1 to 0.2%, and prepare the electrolyte, positive plate, negative plate, and battery cell according to the same operating conditions as in Example 1, and inject liquid into the battery cell And formation and battery cycle performance test. The obtained room temperature cycle performance data are shown in Table 1.

Embodiment 3

[0061] Change the mass content of Compound 1 in the electrolyte prepared in Example 1 to 0.5%, and prepare the electrolyte, positive plate, negative plate, and battery cell according to the same operating conditions as in Example 1, and inject liquid into the battery cell And formation and battery cycle performance test. The obtained room temperature cycle performance data are shown in Table 1.

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Abstract

The invention provides an additive applied to a battery electrolyte, which has a structure as shown in the following (I), and a substituent group is shown in the specification. The invention also provides an electrolyte and a battery using the additive. The additive provided by the invention can effectively reduce the interface impedance and charge transfer impedance between graphite, silicon carbon and other negative electrode materials and an electrolyte, thereby effectively improving the cycle stability and rate capability of the negative electrode materials.

Description

technical field [0001] The invention belongs to the field of lithium-ion battery electrolytes, and relates to an additive for lithium-ion battery electrolytes, an electrolyte and a lithium-ion battery using the additive. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, long cycle life, high working voltage, small self-discharge and no memory effect, and are widely used in 3C, energy storage and power batteries and other fields. Longer cycle life, higher energy density, faster rate performance, wider operating temperature and lower price and cost are important directions for the development of lithium-ion batteries. [0003] Electrolyte is one of the key materials of lithium-ion batteries. Its function is to conduct lithium ions between the positive electrode and the negative electrode, which will have an important impact on the rate performance, cycle life, and temperature window of the battery. The lithium-ion electrolyte is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525H01M2300/0025Y02E60/10
Inventor 蒋志敏马国强沈旻李南董经博陈慧闯刘海岛张海兵
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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