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Nonaqueous electrolyte for improving performance and lithium secondary battery comprising the same

一种锂二次电池、电解质的技术，应用在非水电解质蓄电池、电解质蓄电池制造、二次电池等方向，能够解决锂二次电池性能降低、电池安全性降低等问题

Active Publication Date: 2008-09-10
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of lithium secondary batteries degrades due to the degradation of the anode during repeated charge / discharge cycles
Also, when the battery is exposed to high temperature conditions, the safety of the battery is reduced due to the generation of gas in the battery

Method used

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  • Nonaqueous electrolyte for improving performance and lithium secondary battery comprising the same
  • Nonaqueous electrolyte for improving performance and lithium secondary battery comprising the same
  • Nonaqueous electrolyte for improving performance and lithium secondary battery comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Embodiment 1: the manufacture of lithium secondary battery

[0049] with LiCoO 2 As a cathode active material, a conductive agent and a binder are added to NMP (N-methyl-2-pyrrolidone) along with the cathode active material, thereby forming a cathode slurry. Next, the cathode slurry was coated on an aluminum (Al) current collector to provide a cathode.

[0050] The specific surface area is 1.5m 2 / g of artificial graphite is used as the anode active material, and the conductive agent and the binder are added to the NMP together with the anode active material to form the anode slurry. Next, the anode slurry was coated on a copper (Cu) current collector to provide an anode.

[0051] Use contains 1M LiPF 6 The EC / EMC-based solution dissolved therein was used as an electrolyte, and 1, 2, 4, 6, and 8 parts by weight of fluoropropane sultone (FPS, X=F) were added to the electrolyte.

[0052] A polyolefin-based separator was interposed between the above-obtained cathode a...

Embodiment 2

[0054] A lithium secondary battery was provided in the same manner as in Example 1 except that PS was used in the electrolyte instead of FPS.

Embodiment 3

[0056] A lithium secondary battery was provided in the same manner as in Example 1 except that cyanopropane sultone (CNPS, X=CN) was used in the electrolyte instead of FPS.

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Abstract

Disclosed is a lithium secondary battery comprising a cathode, an anode, an electrolyte and a separator, wherein the anode comprises an anode active material having a specific surface area of 3m<2> / g or less, and the electrolyte comprises 0.1-6 parts by weight of a propane sultone-based compound based on 100 parts by weight of the electrolyte. The lithium secondary battery solves the problem of performance degradation caused by the use of an increased amount of a propane sultone-based compound required to form a SEI film on the surface of an anode upon the first charge cycle. Also, the lithium secondary battery can provide improved cycle characteristics and high-temperature storage characteristics.

Description

technical field [0001] The present invention relates to a lithium secondary battery. The overall performance of the lithium secondary battery can be obtained by detecting the relationship between the specific surface area of ​​the propane sultone-based compound and the anode active material as a component for forming an electrolyte. improve. Background technique [0002] Recently, portable electronic devices such as laptop computers, mobile phones and camcorders have been continuously developed to make them gradually miniaturized and light in weight, so lithium secondary batteries as the driving source of these electronic devices must also have a compressed size and light weight. quality weight. [0003] A lithium secondary battery includes a cathode, an anode, and an electrolyte. During the first charge cycle, lithium ions are extracted from the cathode active material. Lithium ions are then intercalated into the anode active material, such as carbon particles, and extra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/40H01M4/131H01M4/139H01M10/052H01M10/0567H01M10/36
CPCH01M10/0567H01M4/131H01M10/04Y02T10/7011H01M4/139H01M10/052Y02E60/122H01M10/058Y02E60/10Y02P70/50
Inventor 李镐春朴胎润崔龙洙尹琇珍朴洪奎郑贤敏安贞爱
Owner LG ENERGY SOLUTION LTD
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