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Non-aqueous electrolyte for lithium ion battery and lithium ion battery

A non-aqueous electrolyte, lithium-ion battery technology, used in secondary batteries, circuits, electrical components, etc., can solve the problems of high surface tension, affecting the utilization rate of positive and negative materials, and poor wettability of diaphragms, and improve wettability. , Improve high temperature storage performance and cycle performance, improve the effect of permeability

Inactive Publication Date: 2014-03-12
SHENZHEN CAPCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the liquid lithium-ion battery electrolyte mainly uses a mixed solvent of cyclic carbonate and chain carbonate. This kind of aprotic solvent has high viscosity and high surface tension. The compacted density of the battery makes it very difficult to fill the liquid
On the other hand, the adhesion of PE and PP diaphragm materials to the electrolyte is small, resulting in poor wettability of the electrolyte to the diaphragm
Due to the increase of battery capacity, the active material on the pole piece increases, and the space between the component and the shell becomes smaller, making it very difficult to fill the electrolyte
Therefore, the wettability of carbonate-based aprotic solvents to the positive and negative active materials with high specific surface area is not very good, and the penetration becomes slow. The requirement of high-rate charge and discharge will affect the utilization rate of positive and negative electrode materials, which is not conducive to the development of battery capacity and the extension of cycle life

Method used

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  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery
  • Non-aqueous electrolyte for lithium ion battery and lithium ion battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1) Preparation of electrolyte

[0042] Mix ethylene carbonate (EC) and ethyl methyl carbonate (EMC) at a mass ratio of EC:EMC=4:6, then add lithium hexafluorophosphate (LiPF 6 ) to a molar concentration of 1.0mol / L, and then add 0.01% of a wetting additive based on the total mass of the electrolyte: 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoro Propyl ether.

[0043] 2) Preparation of positive plate

[0044] Mix the cathode active material LiCoO with a mass ratio of 93:4:3 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 uniformly coated on both sides of the aluminum foil, dried, calendered and vacuum-dried, and an aluminum lead-out wire is welded on by an ultrasonic welder to obtain a positive plate with a thickness of 120-150 μm.

[0045] 3) Preparation of negative plate

[0046] Mix negative active material modified natural graph...

Embodiment 2

[0061] Repeat Example 1, the difference is that 0.1% of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether is added, the penetration time data obtained by the test are shown in Table 1, and the test results are The normal temperature cycle and high temperature storage data are shown in Table 2.

Embodiment 3

[0063] Repeat Example 1, the difference is that 0.2% of 1,1,2,2-tetrafluoroethyl-2,2,3,3-tetrafluoropropyl ether is added, the penetration time data obtained by the test are shown in Table 1, and the test results are The normal temperature cycle and high temperature storage data are shown in Table 2.

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Abstract

The invention discloses a non-aqueous electrolyte for a lithium ion battery, which comprises a lithium salt, an organic solvent and an impregnating additive, wherein the impregnating additive is a non-ionic surfactant. The non-ionic surfactant is a fluoroether compound disclosed as structural formula (1) (R1-O-R2), wherein R1 is C3-6 fluorine-containing alkyl group, and R2 is C2-6 fluorine-containing alkyl group. The fluoroether compound disclosed as structural formula (1) accounts for 0.01-2 wt% of the total electrolyte. The fluoroether-containing impregnating additive in the non-aqueous electrolyte is a non-ionic surfactant containing hydrophobic groups; and the surfactant can change the surface property of the electrolyte, enhance the adhesive force between the electrolyte and the pole piece and diaphragm, and improve the penetrating quality of the electrolyte on the pole piece.

Description

technical field [0001] The invention relates to the field of lithium ion batteries, in particular to a non-aqueous electrolytic solution with good wettability and a lithium ion battery. Background technique [0002] Lithium-ion batteries are currently the most popular and widely used secondary batteries because of their excellent electrochemical performance, safety and environmental protection. However, with the initial development of electric vehicles and the widespread use of portable devices, people's demand for lithium-ion batteries is increasing, and the requirements for batteries are also increasing. Lithium-ion batteries with limited volume and quality, people hope to use The time and cycle life become longer, so this requires increasing the volume energy density and power density of lithium-ion batteries. At present, the energy density is mainly increased by increasing the working voltage of the battery and increasing the amount of active materials. [0003] Lithium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 石桥周笛雄
Owner SHENZHEN CAPCHEM TECH
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