Lithium secondary batteries with charge-cutoff voltages over 4.35

A lithium secondary battery, battery technology, applied in the direction of secondary battery, secondary battery repair/maintenance, lithium storage battery, etc., can solve the problems of positive electrode surface deterioration, side reaction, lithium dendrite growth, etc., to improve the average discharge voltage , the effect of preventing security degradation and increasing usable capacity

Active Publication Date: 2007-05-09
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, lithium dendrite growth occurs, leading to the problems of rapid exothermic reaction and poor safety of the battery
In addition, side reactions between the positive electrode and the electrolyte may occur, causing deterioration of the surface of the positive electrode and oxidation of the electrolyte

Method used

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  • Lithium secondary batteries with charge-cutoff voltages over 4.35
  • Lithium secondary batteries with charge-cutoff voltages over 4.35
  • Lithium secondary batteries with charge-cutoff voltages over 4.35

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0066] [Example 1-5. Manufacture of battery with charge cut-off voltage exceeding 4.35V]

Embodiment 1

[0067] Embodiment 1. The lithium secondary battery (1) that the charging cut-off voltage is 4.35V

[0068] (production of positive electrode)

[0069] Mix 95wt% LiCoO with a particle size of 10μm 2 , 2.5wt% conductive agent and 2.5wt% binder to form a slurry. The slurry was uniformly applied on both surfaces of an aluminum foil with a thickness of 15 μm and then calendered to obtain an active material weight of 19.44 mg / cm 2 positive pole. The final positive electrode has a thickness of 128 μm.

[0070] (manufacture of negative electrode)

[0071] 4.0 wt% binder and 0.7 wt% conductive agent were added to 95.3 wt% graphite and mixed to form a slurry. The slurry was uniformly applied on both surfaces of a copper foil with a thickness of 10 μm, followed by calendering to obtain an active material weight of 9.56 mg / cm 2 the negative pole. The weight ratio (A / C) of the positive electrode active material to the negative electrode active material per unit area of ​​the respect...

Embodiment 2

[0076] Embodiment 2. The lithium secondary battery (2) that the charging cut-off voltage is 4.35V

[0077] Repeat Example 1 to obtain a lithium secondary battery, except that the active material weight is 22 mg / cm 2 The weight of positive electrode (C) and active material is 11 mg / cm 2 The weight ratio (A / C) of the negative electrode active material to the positive electrode active material per unit area of ​​each electrode is adjusted to 0.50.

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Abstract

Disclosed is a lithium secondary battery comprising a cathode (C), an anode (A), a separator and an electrolyte, wherein the battery has a weight ratio (A / C) of anode active material (A) to cathode active material (C) per unit area of each electrode of between 0.44 and 0.70, and shows a charge cut-off voltage of between 4.35V and 4.6V. The high-voltage lithium secondary battery satisfies capacity balance by controlling the weight ratio (A / C) of anode active material (A) to cathode active material (C) per unit area of each electrode. Therefore, it is possible to significantly increase the available capacity and average discharge voltage of a battery using a lithium / cobalt-based cathode active material, which shows an available capacity of about 50% in a conventional 4.2V-battery . Additionally, it is possible to significantly improve battery safety under overcharge conditions, and thus to provide a high-voltage and high-capacity lithium secondary battery having excellent safety and long service life.

Description

technical field [0001] The present invention relates to a lithium secondary battery with a charging cut-off voltage of 4.35V or higher. More particularly, the present invention relates to a lithium secondary battery having a charge cut-off voltage between 4.35V and 4.6V, a high capacity, a high output, and improved safety, and by controlling the two electrode active materials The weight ratio (A / C), that is, the weight ratio of the negative electrode active material (A) to the positive electrode active material (C) per unit area of ​​the respective electrodes, has a capacity balance suitable for high-voltage batteries. Background technique [0002] Recently, as electronic devices become smaller and lighter, batteries used as power sources therein are increasingly required to be smaller and lighter. As rechargeable batteries with miniaturization and light weight and high capacity, lithium secondary batteries such as secondary lithium ion batteries have been put into practica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/24H01M10/052H01M10/42
CPCH01M10/0567H01M4/133Y02E60/122H01M10/0569H01M4/485H01M2010/4292H01M10/0525H01M10/052H01M4/525H01M2004/021H01M4/131H01M10/42Y02E60/10Y02P70/50
Inventor 金东明尹种文金容呈赵范琎郑俊溶郑大俊裴峻晟
Owner LG ENERGY SOLUTION LTD
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