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Positive electrode material for lithium rechargeable battery, positive electrode for lithium rechargeable battery, comprising same, and lithium rechargeable battery

A lithium secondary battery and positive electrode material technology, applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of active material structure collapse voltage, accelerated battery cell degradation, high irreversible capacity, etc., to reduce the amount of outgassing , Improved high-temperature life characteristics, high-capacity effects

Pending Publication Date: 2020-11-24
LG ENERGY SOLUTION LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since lithium transition metal oxides containing excess lithium have high irreversible capacity, and in high-voltage activation utilizing excess lithium, oxygen other than lithium is released to the outside of the active material structure, there are problems that the active material structure Collapse and voltage sag occurs, thereby accelerating the deterioration of battery cells

Method used

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  • Positive electrode material for lithium rechargeable battery, positive electrode for lithium rechargeable battery, comprising same, and lithium rechargeable battery
  • Positive electrode material for lithium rechargeable battery, positive electrode for lithium rechargeable battery, comprising same, and lithium rechargeable battery
  • Positive electrode material for lithium rechargeable battery, positive electrode for lithium rechargeable battery, comprising same, and lithium rechargeable battery

Examples

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Embodiment 1

[0095] As the first positive electrode active material, the following lithium composite transition metal oxide was prepared in which the average particle diameter (D 50 ) is 11 μm, the molar ratio of Ni:Co:Mn is 33:25:42, (Li / Me) 1 is 1.1.

[0096] As the second positive electrode active material, the following lithium composite transition metal oxide was prepared in which the average particle diameter (D 50 ) is 5 μm, the molar ratio of Ni:Co:Mn is 60:20:20, (Li / Me) 2 is 1, the second positive electrode active material was over-sintered at 880° C. to obtain a crystal grain size of 200 nm and an average particle diameter of the primary particles (D 50) in the form of secondary particles of 1.8 μm. A positive electrode material for a lithium secondary battery was prepared by mixing the first positive electrode active material and the second positive electrode active material in a weight ratio of 70:30.

Embodiment 2

[0098] A positive electrode material for a lithium secondary battery was prepared by the same method as described in Example 1, except that, as the second positive electrode active material, the average particle diameter (D 50 ) is 5 μm, the molar ratio of Ni:Co:Mn is 60:20:20, and (Li / Me) 2 A lithium composite transition metal oxide of 1, and the second positive electrode active material was over-sintered at 950° C. to obtain a crystal grain size of 250 nm and an average particle diameter of the primary particles (D 50 ) in the form of secondary particles of 0.6 μm.

Embodiment 3

[0100] A positive electrode material for a lithium secondary battery was prepared by the same method as described in Example 1, except that, as the first positive electrode active material, the average particle diameter (D 50 ) is 11 μm, the molar ratio of Ni:Co:Mn is 28:22:50, and (Li / Me) 1 Lithium composite transition metal oxide of 1.3.

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Abstract

The present invention relates to a positive electrode material for a lithium rechargeable battery, the positive electrode material for a lithium rechargeable battery, according to the present invention, comprising a first positive electrode active material and a second positive electrode active material. The first positive electrode active material and the second positive electrode active materialare lithium composite transition metal oxides comprising a transition metal including nickel (Ni), cobalt (Co) and manganese (Mn). The average particle diameter (D50) of the first positive electrodeactive material is greater than the average particle diameter (D50) of the second positive electrode active material. The ratio of the number of moles of lithium (Li) to the total number of moles of the transition metal of the first positive electrode active material (Li / Me)1 is higher than 1 to 1.5 or lower. The ratio of the number of moles of lithium (Li) to the total number of moles of the transition metal of the second positive electrode active material (Li / Me)2 is 0.9 to 1. The crystal size of the second positive electrode active material is at least 180 nm.

Description

[Technical field] [0001] CROSS-REFERENCE TO RELATED APPLICATIONS [0002] This application claims priority to and the benefit of Korean Patent Application No. 10-2018-0058423 filed on May 23, 2018, the entire contents of which are incorporated herein by reference. [0003] technical field [0004] The present invention relates to a positive electrode material for a lithium secondary battery, and a positive electrode for a lithium secondary battery and a lithium secondary battery comprising the material. [Background technique] [0005] Recently, with the rapid spread of electronic devices using batteries, such as mobile phones, notebook computers, and electric vehicles, the demand for secondary batteries having small size and light weight and relatively high capacity has rapidly increased. In particular, since lithium secondary batteries have small size and light weight and high energy density, they are attracting attention as a driving power source for portable devices....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525H01M4/505H01M10/052
CPCH01M4/362H01M4/525H01M4/505H01M10/052H01M2004/021H01M4/36Y02E60/10H01M4/364H01M4/131H01M4/1391H01M4/0471H01M10/0525H01M2004/028
Inventor 金东晖李东勋郑王谟朴星彬韩玑范
Owner LG ENERGY SOLUTION LTD
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