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Method for regulating terminal voltage of cathode during overdischarge and cathode active material for lithium secondary battery

A cathode active material, lithium secondary battery technology, applied in battery electrodes, circuits, electrical components, etc., can solve the problems of battery capacity decline, battery unusable, etc., to achieve the effect of excellent performance

Active Publication Date: 2007-10-17
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the oxidation of the copper coil occurs, the battery capacity drops rapidly after overdischarge, and the battery becomes unusable

Method used

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  • Method for regulating terminal voltage of cathode during overdischarge and cathode active material for lithium secondary battery
  • Method for regulating terminal voltage of cathode during overdischarge and cathode active material for lithium secondary battery
  • Method for regulating terminal voltage of cathode during overdischarge and cathode active material for lithium secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0082] A pouch-shaped binary battery was prepared by a conventional method. LiCoO 2 As the cathode active material, and adding Li 2 NiO 2 As an additive, its addition amount was 2 parts by weight based on 100 parts by weight of the cathode active material. More specifically, 78.4 wt.% LiCoO was added to NMP as a solvent 2 , 1.6wt.% Li 2 NiO 2 , 10wt.% of KS-6 (conducting agent) and 10wt.% of PVDF (binder) to form a cathode mixture slurry, and then coating the slurry on an Al current collector to obtain a cathode. In addition, artificial graphite and copper were used as anode active material and anode current collector respectively, and 1M LiPF 6 The EC / PC / DEC-based solution was used as the electrolyte to obtain the battery by conventional methods.

Embodiment 2

[0084] Repeat the method of embodiment 1 to prepare battery, except the Li as cathode active material additive 2 NiO 2 The amount used is 5 parts by weight based on 100 parts by weight of the cathode active material.

Embodiment 3

[0086] Repeat the method of embodiment 1 to prepare battery, except the Li as cathode active material additive 2 NiO 2 The amount of used is 9 parts by weight based on 100 parts by weight of the cathode active material.

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Abstract

Disclosed is a method for regulating terminal voltage of a cathode during overdischarge. Also disclosed is a lithium secondary battery, which is low in capacity loss after overdischarge, having excellent capacity restorability after overdischarge and shows an effect of preventing a battery from swelling at a high temperature.

Description

technical field [0001] The invention relates to a method for adjusting the termination voltage of the cathode during overdischarge. The present invention also relates to a lithium secondary battery which has low capacity loss after overdischarge, has excellent capacity recovery ability after overdischarge, and has a property of preventing battery expansion at high temperature. Background technique [0002] In recent years, with the development of various technologies in the mobile communication industry and the information electronics industry, there has been an increasing demand for low-weight, high-capacity lithium secondary batteries. However, lithium secondary batteries may burn and explode due to excessive heat release during overcharging or short-circuiting. In addition, when the lithium secondary battery is over-discharged below its normal voltage range, its capacity will be significantly reduced, hindering subsequent applications. [0003] For these reasons, safety...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 张诚均洪承泰金亨珍柳德铉高恩英李镐春郑俊溶延珍熙
Owner LG ENERGY SOLUTION LTD
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