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Electrolyte and battery comprising same

An electrolyte and battery technology, applied in the field of electrolyte, can solve the problems of unbalanced electrical performance and poor safety performance, achieve high thermodynamic stability and high ion conductivity, improve flame retardancy, and avoid side reactions.

Pending Publication Date: 2022-08-05
ZHUHAI COSMX BATTERY CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the battery in the prior art with poor safety performance and electrical performance under high voltage, the present invention provides an electrolyte and a battery including the electrolyte. The electrolyte can be stabilized on the surface of the positive and negative electrodes. Film formation can improve the high-temperature cycle life and low-temperature performance of the battery under high voltage, while taking into account the safety performance of the battery

Method used

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  • Electrolyte and battery comprising same
  • Electrolyte and battery comprising same
  • Electrolyte and battery comprising same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0035] The preparation method of lithium ion battery includes:

[0036] [Preparation of positive electrode sheet]

[0037] The positive active material lithium cobalt oxide (LCO), the binder polyvinylidene fluoride (PVDF), the conductive carbon black and the single-walled carbon nanotubes are mixed in a weight ratio of 97.2:1.5:1.2:0.1, and N-methylpyrrolidone is added. (NMP), stir under the action of a vacuum mixer until the mixed system becomes a positive electrode slurry with uniform fluidity; the positive electrode slurry is uniformly coated on the current collector aluminum foil; the above coated aluminum foil is placed in 5 different temperature gradients. After being baked in the oven, it was dried in an oven at 120° C. for 8 hours, and then rolled and cut to obtain the desired positive electrode sheet.

[0038] [Preparation of negative electrode sheet]

[0039] The negative electrode active material graphite, thickener sodium carboxymethyl cellulose (CMC-Na), binder ...

Embodiment 1～14 and comparative example 1～4

[0045] The batteries of Examples 1 to 14 and Comparative Examples 1 to 4 were prepared according to the above-mentioned preparation method. The difference between different Examples and Comparative Examples is only the composition of the electrolyte, as shown in Table 1 below.

[0046] The electrolyte composition of table 1 embodiment and comparative example

[0047]

[0048]

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte and a battery comprising the electrolyte. According to the electrolyte provided by the invention, the first additive imide phosphate compound is added, the first additive imide phosphate compound has relatively low LUMO and relatively high HOMO, stable film formation on the surfaces of a positive electrode and a negative electrode is facilitated, side reaction between the positive electrode material and the electrolyte and the negative electrode material and the electrolyte is avoided, and meanwhile, a generated interfacial film is rich in N and P, so that the service life of the electrolyte is prolonged. The interfacial film has high thermodynamic stability and high ionic conductivity, the high-temperature cycle performance and low-temperature performance of the battery under high voltage can be improved, meanwhile, phosphate groups in phosphate groups can capture electrolyte H / OH free radicals, the diffusion reaction of the free radicals in the battery combustion process is inhibited, and meanwhile, the performance of the battery is improved. The phosphate group can be combined with lewis acid such as free PF5 in the electrolyte, so that the flame retardance of the electrolyte is further improved, and a battery with good thermal stability, namely safety performance, is obtained.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and particularly relates to an electrolyte and a battery including the electrolyte. Background technique [0002] As the blood of lithium-ion batteries, electrolyte is an indispensable component of lithium-ion batteries and plays a crucial role in the performance of lithium-ion batteries. In recent years, with the continuous development of lithium-ion battery technology, high operating voltage, long cycle life and high safety performance have become important performance indicators of lithium-ion batteries. However, with the continuous improvement of the working voltage, the stability of the positive and negative materials of the lithium-ion battery at high voltage decreases, and the redox side reaction of the electrolyte on the surface of the positive and negative electrodes intensifies, resulting in the continuous increase of the resistance of the lithium-ion battery, and the batt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCH01M10/0567H01M10/0525Y02P70/50
Inventor 王海李素丽李俊义
Owner ZHUHAI COSMX BATTERY CO LTD
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