Lithium ion secondary battery as well as electrolyte thereof

A secondary battery and electrolyte technology, applied in the battery field, can solve the problems of high impedance and deteriorate the discharge performance of lithium ion secondary batteries, and achieve the effect of good low-temperature discharge performance

Active Publication Date: 2014-03-05
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of 1,3-propane sultone (PS) will form a thick SEI film on the surface of the negative electrode, which has a large impedance and will deteriorate the discharge performance of lithium-ion secondary batteries at low temperatures.
[0004] Patent CN101755354A discloses a method for forming an SEI film on the surface of the negative electrode, adding 4-methylene-1,3-dioxolan-2-one to the electrolyte to improve the cycle performance of lithium-ion secondary batteries , the low temperature discharge performance is not mentioned in the patent

Method used

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  • Lithium ion secondary battery as well as electrolyte thereof
  • Lithium ion secondary battery as well as electrolyte thereof
  • Lithium ion secondary battery as well as electrolyte thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of positive electrode sheets for lithium-ion secondary batteries

[0029] The active material lithium cobalt oxide LiCoO 2 , the conductive agent Super-P, and the binder PVDF are added to the solvent N-methylpyrrolidone (NMP) at a mass ratio of 96:2:2 and mixed evenly to make a positive electrode slurry for lithium-ion secondary batteries, and the positive electrode slurry is coated On the aluminum foil of the current collector, dry it at 85°C and then cold press; then trim, cut into pieces, and slitting, and then dry it under vacuum at 85°C for 4 hours, and weld the tabs to make a lithium battery that meets the requirements. Ion secondary battery cathode sheet.

[0030] (2) Preparation of negative electrode sheet for lithium-ion secondary battery

[0031] The active material graphite, conductive agent Super-P, thickener CMC, and binder SBR are added to the solvent deionized water at a mass ratio of 96.5:1.0:1.0:1.5 and mixed evenly to make a negative ...

Embodiment 2

[0037] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte solution of the lithium-ion secondary battery (ie step (3)), the additive was 1,3-propanesulfonic acid with a mass percentage of 0.3% lactone (PS) and 4-methylene-1,3-dioxolan-2-one with a mass percentage of 0.5%.

Embodiment 3

[0039] A lithium-ion secondary battery was prepared according to the method of Example 1, except that in the preparation of the electrolyte solution of the lithium-ion secondary battery (ie step (3)), the additive was 1,3-propanesulfonic acid with a mass percentage of 0.3% lactone (PS) and 4-methylene-1,3-dioxolan-2-one with a mass percentage of 1.0%.

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Abstract

The invention provides a lithium ion secondary battery as well as electrolyte thereof. The electrolyte of the lithium ion secondary battery comprises lithium salt, non-aqueous organic solvents and additives, wherein the additives comprise a first additive and a second additive; the first additive is 1, 3-propane suhone (PS), and the second additive is 4-methylene-1, 3-dioxolane-2-ketone and derivatives thereof with a structural formula 1 as shown in the specification and / or 4, 5-dimethylene-1, 3-methylene-2-ketone as well as derivatives thereof with a structural formula 2 as shown in the specification; in the structural formula 1 and the structural formula 2, R1, R2, R3 and R4 are respectively nitrogen, halogen, C1-C3 alkyl group or halogenated alkyl group; the first additive accounts for 0.3-4.0 percent by mass of the electrolyte of the lithium ion secondary battery, and the second additive accounts for 0.3-4.0 percent by mass of the electrolyte of the lithium ion secondary battery. The lithium ion secondary battery comprises the electrolyte. The lithium ion secondary battery provided by the invention has a favorable low-temperature electric discharge performance.

Description

technical field [0001] The invention relates to the field of batteries, in particular to a lithium-ion secondary battery and its electrolyte. Background technique [0002] Lithium-ion secondary batteries have the advantages of high working voltage, long life, and fast charging speed. However, with the continuous development of technology and people's demand for fast electronic products, lithium-ion secondary batteries are required to have better cycle performance. At the same time Lithium-ion secondary batteries are also required to be capable of rapid discharge at relatively low temperatures. [0003] In actual use, cyclic carbonates and chain carbonates are generally used as solvents, but during the charging and discharging process of the battery, the solvent is continuously oxidized or reduced, and the cycle performance of the lithium-ion secondary battery will deteriorate. Patent US6033809A discloses that 1,3-propane sultone (PS) is added to the electrolyte to improve t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122H01M10/0525H01M10/0567H01M2300/0025H01M10/0569H01M2300/0037Y02E60/10
Inventor 褚春波付成华
Owner NINGDE AMPEREX TECH
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