Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

A negative electrode active material, lithium battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of long charging time users complain about inconvenience, and achieve the effect of excellent electrolyte impregnation

Inactive Publication Date: 2019-03-15
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Specifically, the short charging time is the most desired, because the long charging time is the most inconvenient complaint by users

Method used

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  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same
  • Negative active material for rechargeable lithium battery and rechargeable lithium battery including same

Examples

Experimental program
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Effect test

example 1

[0097] By mixing primary particles formed of needle coke-type artificial graphite and having an average particle diameter (D50) of 9.0 μm and an aspect ratio ranging from 1 to 5 with binder pitch in a weight ratio of 9:1 and making them Agglomerated to prepare a secondary particle negative active material having an average particle diameter (D50) of 20.5 μm. In the negative electrode active material, the ratio of the average particle diameter (D50) of the secondary particles / the average particle diameter (D50) of the primary particles was 2.28.

example 2

[0099] By mixing primary particles formed of needle coke-type artificial graphite and having an average particle diameter (D50) of 5.0 μm and an aspect ratio ranging from 1 to 5 with binder pitch in a weight ratio of 8:2 and making them Agglomerated to prepare a secondary particle negative active material having an average particle diameter (D50) of 13.5 μm. In the negative electrode active material, the average particle diameter (D50) of the secondary particles / average particle diameter (D50) of the primary particles was 2.70.

example 3

[0101] By mixing primary particles formed of needle coke-type artificial graphite and having an average particle diameter (D50) of 9.0 μm and an aspect ratio ranging from 1 to 5 with binder pitch in a weight ratio of 9:1 and making them Agglomerated to prepare a secondary particle negative active material having an average particle diameter (D50) of 18.4 μm. In the negative electrode active material, the average particle diameter (D50) of the secondary particles / average particle diameter (D50) of the primary particles was 2.04.

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Abstract

A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the same are disclosed, and the negative active material includes a primary particle of a crystalline carbon-based material and secondary particle that is an assembly of the primary particles, wherein a ratio of an average particle diameter (D50) of the secondary particle relative to an average particle diameter (D50) of the primary particle (average particle diameter (D50) of the secondary particle / average particle diameter (D50) of the primary particle) ranges from about 1.5 to about 5and an aspect ratio of the primary particle ranges from about 1 to about 7.

Description

technical field [0001] A negative active material for a rechargeable lithium battery and a rechargeable lithium battery including the negative active material are disclosed. Background technique [0002] Portable information devices such as cellular phones, laptop computers, smart phones, etc. or electric vehicles have used rechargeable lithium batteries as driving power sources. [0003] A rechargeable lithium battery includes a positive electrode, a negative electrode, and an electrolyte. For the positive electrode active material of the positive electrode, an oxide composed of lithium and a transition metal and having a structure capable of intercalating lithium ions, such as LiCoO, has been used 2 , LiMn 2 o 4 and LiNi 1-x co x o 2 (0<x<1). [0004] For the negative electrode active material, various carbon-based materials such as artificial graphite, natural graphite, and hard carbon that intercalate and deintercalate lithium ions have been used. [0005] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/587H01M4/36H01M4/38H01M4/133H01M10/0525
CPCH01M4/583H01M4/587H01M10/052H01M2004/021H01M2004/027H01M4/366H01M4/386H01M4/387H01M4/133Y02E60/10H01M4/364H01M10/0525
Inventor 安知愚金桐佑罗载浩张范镇车有琳崔延朱崔一英
Owner SAMSUNG SDI CO LTD
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