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Nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte batteries, secondary batteries, non-aqueous electrolytes, etc., can solve the decline of battery charge and discharge characteristics, the influence of low temperature characteristics of ethylene carbonate, and the inability to ensure low temperature features, etc.

Inactive Publication Date: 2002-09-18
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are problems in the case of using metal lithium as the negative electrode: dendritic lithium will be precipitated during charging, and with repeated charge and discharge, the dendritic lithium accumulated on the plate will be free from the plate and suspended in the battery fluid , or in contact with the positive pole, causing a small short circuit, etc.
However, there is still a problem that even in mixed solvents, ethylene carbonate still has a considerable influence on low-temperature characteristics, and sufficient low-temperature characteristics cannot be ensured.
[0009] However, there is a problem that γ-butyrolactone, which is a lactone-based solvent, is easily reductively decomposed on the negative electrode, and a large amount of decomposition gas is generated in the battery.
That is, the excessive film becomes an obstacle, so that lithium ions cannot be absorbed and discharged smoothly on the negative electrode, resulting in a significant decline in the charge and discharge characteristics of the battery after being placed under high temperature conditions for a certain period of time.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0065] figure 1 Shown is a cross-sectional front view of the right half of the cylindrical non-aqueous electrolyte secondary battery (18 mm in diameter, 65 mm in total height) used in this embodiment. The battery was fabricated as follows.

[0066] The separator 1 is sandwiched between the strip-shaped positive electrode plate 2 and the negative electrode plate 3, and wound several times in a spiral shape to form an electrode plate group. The positive electrode lead plate 4 made of aluminum and the negative electrode lead plate 5 made of nickel are welded to the positive electrode plate 2 and the negative electrode plate 3 respectively. Install the polyethylene resin bottom insulating plate 6 under the pole plate group, put it into the battery iron case 7 whose inner surface is nickel-plated, and spot-weld the other end of the negative lead plate 5 on the inner fixing surface of the battery case 7 . Place the polyethylene resin upper insulating plate 8 on the upper surface o...

Embodiment 2

[0085] Since vinylene carbonate (VC) causes a very rapid polymerization reaction on the negative electrode, if the amount added to the electrolyte solution is too large, excessive film formation on the negative electrode may result in a decrease in low-temperature characteristics. To this end, the VC content in non-aqueous solvents was studied.

[0086] Batteries 1C to 7C which were the same as battery 2A in the example were fabricated except that the VC content in the nonaqueous solvent was changed as shown in Table 4. That is, as the cyclic carboxylate (A), γ-butyrolactone (GBL) is used, as the cyclic carbonate (C) having no carbon-carbon unsaturated bond, propylene carbonate (PC) is used, and as the solute , using LiBF 4 , the PC content in the non-aqueous solvent is 1 vol%, the LiBF in the non-aqueous electrolyte 4 The concentration is 1.25 mol / L.

[0087] The capacity retention rates of the obtained batteries 1C to 7C in a low-temperature environment were evaluated in ...

Embodiment 3

[0092] Next, the content of propylene carbonate (PC) or ethylene carbonate (EC) in the non-aqueous solvent was examined.

[0093] Batteries 1D to 18D which were the same as batteries 2A or 4A in the example were fabricated except that the PC or EC content in the non-aqueous solvent was changed as shown in Table 6. That is, as the cyclic carboxylate (A), γ-butyrolactone (GBL) is used, as the cyclic carbonate having at least one carbon-carbon unsaturated bond, vinylene carbonate (VC) is used, and as the solute, LiBF 4 , the VC content in the non-aqueous solvent is 2% by volume, the LiBF in the non-aqueous electrolyte 4 The concentration is 1.25 mol / L.

[0094] The capacity retention rates of the obtained batteries 1D to 18D in a low-temperature environment and the capacity retention rates after high-temperature storage were evaluated in the same manner as in Example 1. The results are shown in Table 7.

[0095]

[0096] Battery

[0097]As shown in Table ...

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Abstract

In the electrolytic solution of the non-aqueous electrolyte secondary battery of the present invention, a cyclic carboxylate having high conductivity in a low-temperature environment is contained, and a cyclic carboxylate having at least one carbon is used to suppress the reductive decomposition of the above-mentioned cyclic carboxylate. A cyclic carbonate with a saturated bond and a cyclic carbonate without a carbon-carbon unsaturated bond for inhibiting excessive polymerization of the above-mentioned cyclic carbonate with at least one carbon-carbon unsaturated bond under high temperature conditions.

Description

technical field [0001] The present invention relates to a non-aqueous electrolyte secondary battery. Background technique [0002] In recent years, electronic devices such as personal computers and mobile phones have rapidly developed in terms of miniaturization, weight reduction, and cordlessness. As their driving power sources, secondary batteries with high energy density are required. Among them, a nonaqueous electrolyte secondary battery using lithium as an active material is highly expected as a battery having high voltage and high energy density. In the past, metal lithium was used for the negative electrode of this battery, and molybdenum disulfide, manganese dioxide, and vanadium pentoxide were used for the positive electrode, and a 3V-level battery has been realized. [0003] However, there are problems in the case of using metal lithium as the negative electrode: dendritic lithium will be precipitated during charging, and with repeated c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/52H01M4/525H01M6/16H01M8/04H01M8/10H01M10/0569
CPCH01M4/525H01M6/164H01M10/0569H01M2300/0025H01M2300/004Y02E60/10H01M10/0566H01M10/0525
Inventor 上田敦史岩本和也尾浦孝文芳泽浩司出口正树森川敬元
Owner PANASONIC CORP
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