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Nonaqueous electrolyte solution and lithium secondary battery using same

A non-aqueous electrolyte and lithium secondary battery technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve the problems of no cycle characteristics and insufficient cycle performance, and achieve excellent battery performance, excellent battery characteristics, and maintenance of battery life. performance effect

Active Publication Date: 2008-01-16
MU IONIC SOLUTIONS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In Patent Document 7, a lithium secondary battery is disclosed in which a pentafluorobenzene compound having an electron-donating group such as pentafluoroanisole is added, but the 200-cycle capacity retention rate of the button battery is about 80%, and the cycle performance insufficient
[0010] In Patent Document 8, as a chemical overcharge protection method for non-aqueous electrolyte secondary batteries, it is described that pentafluoroanisole can be used as a redox reagent, but there is no description about cycle characteristics

Method used

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  • Nonaqueous electrolyte solution and lithium secondary battery using same
  • Nonaqueous electrolyte solution and lithium secondary battery using same
  • Nonaqueous electrolyte solution and lithium secondary battery using same

Examples

Experimental program
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Effect test

Embodiment 1

[0157] [Preparation of non-aqueous electrolyte solution]

[0158] Prepare a non-aqueous solvent of EC:MEC:DEC (capacity ratio) = 3:4:3, and dissolve LiPF as an electrolyte salt in it 6 , so as to reach a concentration of 1M, so that after preparing the non-aqueous electrolytic solution, add fluoroethylene carbonate (FEC) that is 2% by weight relative to the non-aqueous electrolytic solution, and then add 2-propynyl as an alkyne derivative Methyl carbonate was adjusted to be 1% by weight relative to the non-aqueous electrolytic solution.

[0159] [Preparation of Lithium Secondary Battery and Measurement of Battery Characteristics]

[0160] Mixed 94 wt% LiCo 1 / 3 Ni 1 / 3 Mn 1 / 3 O 2 (positive electrode active material), 3% by weight of acetylene black (conductive agent), 3% by weight of polyvinylidene fluoride (binder), to which 1-methyl-2-pyrrolidone solvent was added, and the obtained material was mixed Coating on aluminum foil, drying, press molding, heat treatment to pre...

Embodiment 2～9

[0164] In Example 1, it carried out similarly to Example 1 except having used the alkyne derivative shown in Table 1 in the predetermined amount instead of 2-propynyl methyl carbonate. The results are shown in Table 1.

Embodiment 10

[0166] After preparing the non-aqueous electrolytic solution in the same manner as in Example 1, add vinyl ethylene carbonate (VEC) that is 2% by weight relative to the non-aqueous electrolytic solution, and then add two (2-propynyl) sulfites to make It carried out similarly to Example 1 except that it was 0.5 weight% with respect to a nonaqueous electrolytic solution. The results are shown in Table 1.

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Abstract

Disclosed is a nonaqueous electrolyte solution which is excellent in battery characteristics such as battery capacity, cycle characteristics and storage characteristics and is capable of maintaining adequate battery performance for a long time. Also disclosed is a lithium secondary battery using such a nonaqueous electrolyte solution. Specifically disclosed is a nonaqueous electrolyte solution for lithium secondary batteries wherein an electrolyte salt is dissolved in a nonaqueous solvent. This nonaqueous electrolyte solution contains 0.1-10% by weight of an ethylene carbonate derivative represented by the general formula (I) below, and 0.01-10% by weight of a triple bond-containing compound (A) and / or a pentafluorophenyloxy compound (B) represented by the general formula (X) below. Also specifically disclosed is a lithium secondary battery using such a nonaqueous electrolyte solution. [Chemical formula 1] (I) (In the formula (I), R<1>-R<3> respectively represent a hydrogen atom, a halogen atom, an alkenyl group, an alkynyl group or an aryl group. In this connection, ethylene carbonates are excluded.) [Chemical formula 2] (X) (In the formula (X), R<15> represents an alkylcarbonyl group, an alkoxycarbonyl group, an aryloxycarbonyl group or an alkanesulfonyl group.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution capable of forming a lithium secondary battery excellent in battery characteristics such as electric capacity, cycle characteristics, and storage characteristics, and a lithium secondary battery using the same. Background technique [0002] In recent years, lithium secondary batteries have been widely used as power sources for driving small electronic devices and the like. A lithium secondary battery is mainly composed of a positive electrode containing a lithium composite oxide, a negative electrode containing a carbon material or lithium metal, and a nonaqueous electrolytic solution. As the non-aqueous electrolytic solution, carbonates such as ethylene carbonate (EC) and propylene carbonate (PC) can be used. [0003] When using e.g. LiCoO 2 , LiMn 2 o 4 , LiNiO 2 In a lithium secondary battery as a positive electrode, the solvent in the non-aqueous electrolyte will partially oxi...

Claims

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Application Information

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IPC IPC(8): H01M10/40H01M4/02H01M4/58
CPCY02E60/122Y02E60/10
Inventor 安部浩司桑田孝明
Owner MU IONIC SOLUTIONS CORP
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