Battery electrolyte additive, and electrolyte and lithium ion battery using additive

A technology of electrolyte additive and lithium-ion battery, applied in the field of electrolyte and lithium-ion battery

Pending Publication Date: 2020-07-07
ZHEJIANG RES INST OF CHEM IND CO LTD +1
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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, and electrolyte and lithium ion battery using additive
  • Battery electrolyte additive, and electrolyte and lithium ion battery using additive
  • Battery electrolyte additive, and electrolyte and lithium ion battery using additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Preparation of electrolyte

[0044]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 ) to a molar concentration of 1mol / L, and then add 1% lithium hexafluoroisopropoxide based on the total mass of the electrolyte.

[0045] (2) Preparation of positive plate

[0046] Mix positive electrode active material lithium nickel cobalt manganese oxide LiNi according to mass ratio 93:4:3 0.5 co 0.2 mn 0.3 o 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 positive electrode slurry is uniformly coated on both sides of the aluminum foil, dried, calendered and vacuum dried, and the aluminum lead-out wire is welded with an ultrasonic welder to obtain the positive electrode plate.

[0047] (3) Preparation of negative plat...

Embodiment 2

[0058] Replace the 1% lithium hexafluoroisopropoxide in the electrolyte prepared in Example 1 with 0.05% lithium hexafluoroisopropoxide, and prepare the electrolyte, positive plate and negative plate according to the same operating conditions as in Example 1 , batteries, and conduct liquid injection and formation of batteries and cycle performance tests of batteries. The obtained room temperature cycle performance data are shown in Table 1.

Embodiment 3

[0060] Replace the 1% lithium hexafluoroisopropoxide in the electrolyte prepared in Example 1 with 0.1% lithium hexafluoroisopropoxide, and prepare the electrolyte, positive plate, and negative plate according to the same operating conditions as in Example 1 , batteries, and conduct liquid injection and formation of batteries and cycle performance tests of batteries. 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): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0567H01M10/0525H01M10/4235H01M2300/0025Y02E60/10
Inventor 马国强沈旻李南蒋志敏陈慧闯董经博刘海岛张海兵
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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