Negative active material, method of preparing same, 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 low conductivity, high performance degradation, unusable batteries, etc., to achieve excellent charging and discharging characteristics, low expansion phenomenon , the effect of improving expansion characteristics

Inactive Publication Date: 2012-03-14
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because of its low conductivity (about 10 -9 S / cm), which has the problem of high reaction resistance during lithium intercalation / deintercalation and high drop in performance during sudden charge / discharge at high C rates
Therefore, it cannot be used in batteries requiring high power

Method used

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  • Negative active material, method of preparing same, and rechargeable lithium battery including same
  • Negative active material, method of preparing same, and rechargeable lithium battery including same
  • Negative active material, method of preparing same, and rechargeable lithium battery including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] In a ball mill, the Li 2 CO 3 and TiO 2 Mix and stir in water to prepare a slurry including lithium-titanium composite fine particles. At this time, the average particle diameter of the lithium-titanium composite fine particles was about 1 μm.

[0106] The above slurry was sprayed and dried at about 300° C. to obtain large lithium-titanium composite particles. The obtained large lithium-titanium composite particles had an average particle diameter of about 50 μm.

[0107] The resulting large particles were sintered in a sintering furnace for about 5 hours at a temperature of about 850° C. in an air atmosphere, and pulverized so that the primary particles of the sintered product had an average particle size of about 250 nm (existing between 100 nm and 500 nm) , and the secondary particles have an average particle size of about 20 μm. Therefore, if figure 2 As shown in the SEM photo of , a negative electrode active material including secondary particles was prepare...

Embodiment 2

[0112] Using a particle mill, the Li 4 Ti 5 o 12 The secondary particles obtained from the primary particles shown were pulverized so that the average particle diameter of the secondary particles became about 10 μm to prepare a negative electrode active material.

[0113] The negative active material has about 3.0m 2 / g specific surface area. The primary particles have an average particle diameter of about 250 nm (between 100 nm and 500 nm). Based on the total weight of the negative active material, the negative active material included 0.1 wt% of carbonate.

[0114] Using the above negative active material, a half cell was fabricated according to the same procedure as in Example 1.

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Abstract

The present invention relates to a negative electrode active material for a rechargeable lithium battery, a method of manufacturing the same, and a rechargeable lithium battery including the same. The negative active material has a specific surface area of 2 m<2> / g or more and less than 5 m<2> / g and includes secondary particles composed of assembled primary particles of a compound represented by Chemical Formula 1: [Chemical Formula 1] Li4-x-yMyTi5+x-zM'zO12 wherein, x is 0 or 1, or 0 to 1, y is 0 or 1, or 0 to 1, z is 0 or 1, or 0 to 1, M is La, Tb, Gd, Ce, Pr, Nd, Sm, Ba, Sr, Ca, Mg, or a combination thereof, and M' is V, Cr, Nb, Fe, Ni, Co, Mn, W, AI, Ga, Cu, Mo, P, or a combination thereof.

Description

technical field [0001] The present disclosure relates to a negative active material for a rechargeable lithium battery, a method of manufacturing the negative active material, and a rechargeable lithium battery including the negative active material. Background technique [0002] Lithium rechargeable batteries have drawn attention as power sources for small portable electronic devices. They use an organic electrolyte solution, thereby having a discharge voltage twice that of a conventional battery using an alkaline aqueous solution, and thus have a high energy density. [0003] For positive electrode active materials for rechargeable lithium batteries, lithium-transition element composite oxides capable of intercalating lithium have been investigated, such as LiCoO 2 , LiMn 2 o 4 、LiNi 1-x co x o 2 (0<x<1) and so on. [0004] For negative active materials of rechargeable lithium batteries, various carbon-based materials capable of both intercalating and deinterc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/58H01M4/1391H01M4/1397H01M10/0525
CPCC01G1/00C01G23/005C01P2002/52C01P2004/51C01P2004/62C01P2006/12C01P2006/40H01M4/131H01M4/485H01M10/0525Y02E60/10
Inventor 严智勇
Owner SAMSUNG SDI CO LTD
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