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Flame retardant electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

An electrolyte and lithium battery technology, which is applied in the manufacture of electrolyte batteries, non-aqueous electrolyte batteries, electrodes of non-aqueous electrolyte batteries, etc. Effect

Active Publication Date: 2010-09-29
SAMSUNG SDI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, if an excessive amount (that is, the amount of solvent rather than the amount added) of phosphoric acid flame retardant is added, the cycle life characteristics of the resulting battery are significantly reduced

Method used

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  • Flame retardant electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same
  • Flame retardant electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same
  • Flame retardant electrolyte for rechargeable lithium battery and rechargeable lithium battery including the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0158] Flame retardant electrolyte solution is composed of 9wt% LiPF 6 (1M concentration), 50wt% dimethyl carbonate (DMC), 20wt% ionic solution containing ammonium cation represented by the following chemical formula 32, 10wt% trimethyl phosphate (TMP), 1wt% LiFOB and 10wt % Fluoroethylene carbonate (FEC) preparation.

[0159] Chemical formula 32

[0160]

experiment example 1

[0169] Experimental example 1: Measuring the viscosity of the flame-retardant electrolyte solution

[0170] Each flame-retardant electrolyte solution prepared according to Example 1 and Comparative Examples 1 to 4 was measured to determine the viscosity. A rotational viscometer (digital) was used to measure the viscosity of each flame-retardant electrolyte solution by monitoring the stress change with frequency, and the viscosity was evaluated. The results are shown in Table 1 below.

experiment example 2

[0171] Experimental example 2: Measuring the flame retardancy of flame retardant electrolyte solution

[0172] Each flame retardant electrolyte solution prepared according to Example 1 and Comparative Examples 1 to 4 was measured to determine the flame retardancy. The flame retardancy of each flame retardant electrolyte solution was measured by the standard method of UL 94 flammability test to determine the degree of combustion in the flame burning test. The flammability test is carried out by the following steps: support 4 cm × 1 cm glass fiber with 0.5 g of electrolyte solution, make one end of it contact the fire source, observe whether it catches fire, and observe the duration of fire to determine the flame retardancy of the flame retardant electrolyte solution .

[0173] Table 1:

[0174]

Viscosity (cP)

Flame retardant

Example 1

5

Nonflammable

Comparative example 1

3.2

Flammable

Comparative example 2

3.4

Self-extinguishing

Comparative example 3

10.3

Nonfla...

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PUM

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Abstract

Flame retardant electrolyte solutions for rechargeable lithium batteries and lithium batteries including the electrolyte solutions are provided. The flame retardant electrolyte solution includes a lithium salt, a linear carbonate-based solvent, at least one ammonium cation, a phosphoric acid-based solvent, and an additive including oxalatoborate.

Description

Technical field [0001] The present invention relates to a flame-retardant electrolyte solution for a rechargeable lithium battery, and also relates to a rechargeable lithium battery including the electrolyte solution. Background technique [0002] Recently, as a power source for small portable electronic devices, lithium rechargeable batteries have begun to attract attention. Lithium rechargeable batteries use organic electrolyte solutions, and the resulting discharge voltage is twice that of conventional batteries using alkaline aqueous solutions. Therefore, the lithium rechargeable battery has a high energy density. [0003] Lithium-transition element composite oxides capable of intercalating lithium (such as LiCoO 2 , LiMn 2 O 4 , LiNiO 2 , LiNi 1-x Co x O 2 (0<x<1) etc.) has been used as a positive electrode active material for rechargeable lithium batteries. [0004] Various carbon-based materials capable of intercalating and deintercalating lithium ions (such as artific...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/056H01M10/052H01M4/62H01M10/058
CPCH01M4/133H01M4/62H01M10/052H01M4/139H01M10/0567H01M4/0466H01M10/0525H01M10/4235H01M4/1393Y02E60/122H01M2300/0045H01M2300/0025H01M10/0569H01M10/0568H01M4/0452H01M4/13Y02E60/10Y10T29/49115Y02P70/50H01M4/02H01M10/05H01M10/38
Inventor 崔南顺伊琳娜·普罗法提洛娃鲁世源朴容彻金性洙
Owner SAMSUNG SDI CO LTD
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