Electrolyte and lithium ion battery

An electrolyte and lithium salt technology, which is applied in the field of electrolyte and lithium-ion batteries, can solve problems such as easy gas production, and achieve the effects of improving high temperature stability and improving gas production problems

Active Publication Date: 2021-06-01
SVOLT ENERGY TECHNOLOGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide an electrolyte and a lithium-ion battery to solve the problem that the lithium-ion battery in the prior art is prone to gas production during high-temperature circulation or storage

Method used

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  • Electrolyte and lithium ion battery
  • Electrolyte and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Preparation of positive electrode sheets for lithium-ion secondary batteries

[0057] The positive electrode active material lithium nickel cobalt manganese oxide (LiNi 0.6 co 0.1 mn 0.3 o 2 ), the conductive agent Super-P, and the binder PVDF were dissolved in the solvent N-methylpyrrolidone at a mass ratio of 96.0:2.0:2.0 and mixed evenly to make the positive electrode slurry, and the positive electrode slurry was evenly coated on the current collector aluminum foil , coating amount is 18 mg / cm 2 , followed by drying at 85°C, cold pressing, trimming, cutting, and stripping, drying at 85°C for 4 hours under vacuum, and welding the tabs to make a positive electrode sheet of a lithium-ion secondary battery that meets the requirements.

[0058] (2) Preparation of negative electrode sheet for lithium-ion secondary battery

[0059] Negative electrode active material artificial graphite, conductive agent Super-P, thickener CMC, and binder SBR are dissolved in solven...

Embodiment 2

[0065] The difference between embodiment 2 and embodiment 1 is that

[0066] The tetrakis(trimethylsiloxy)silane compound accounts for 1% of the total mass of the organic solvent, and finally a lithium-ion secondary battery is obtained.

Embodiment 3

[0068] The difference between embodiment 3 and embodiment 1 is that

[0069] The tetrakis(trimethylsiloxy)silane compound accounts for 0.1% of the total mass of the organic solvent, and finally a lithium-ion secondary battery is obtained.

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Abstract

The invention provides an electrolyte and a lithium ion battery. The electrolyte comprises an organic solvent, LiPF6 and an additive, the additive comprises a tetra(trialkylsiloxy)silane compound shown in formula I shown in the description, and R in the formula I is selected from any one of C1-C4 alkyl groups. The tetra(trialkylsiloxy)silane compound in the electrolyte contains more silicon-oxygen bonds, and substituent groups on the tetra(trialkylsiloxy)silane compound integrate the advantages of a charge induction effect and a steric hindrance effect, so that the tetra(trialkylsiloxy)silane compound is subjected to a hydrolysis reaction to the maximum extent, that is the tetrakis(trimethylsiloxy)silane can react with 4 moles of water molecules, such that the residual water in the lithium ion battery system can be removed so as to substantially improve the gas production problem of the lithium ion battery, and further improve the comprehensive performances such as the high temperature stability, the cycle stability and the like of the lithium ion battery;.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to an electrolyte and a lithium ion battery. Background technique [0002] In recent years, with the development of new energy technologies, lithium-ion power batteries for vehicles have put forward higher requirements on the performance of lithium-ion secondary batteries. In order to meet the requirements of long cruising range, wide temperature range environment, and fast charging of electric vehicles, it is necessary to develop lithium-ion secondary batteries with higher energy density, better cycle, storage performance, and low temperature resistance. However, in addition to the fact that raw materials such as positive electrodes, negative electrodes, and separators of lithium-ion secondary batteries usually contain relatively high moisture, during the production process of batteries, the cells are also prone to absorb moisture in the production environment, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525H01M10/42
CPCH01M10/0525H01M10/0567H01M10/4235Y02E60/10
Inventor 冯绍伟
Owner SVOLT ENERGY TECHNOLOGY CO LTD
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