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Nonaqueous electrolyte solution and lithium secondary battery using same

一种锂二次电池、非水电解液的技术，应用在电解液领域，能够解决没有氟化链状碳酸酯、改善锂离子电池充放电循环特性等问题，达到抑制膨胀、实现高容量化、提高充放电循环特性的效果

Active Publication Date: 2011-06-15
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are no specific examples about fluorinated chain carbonates in the technical solutions and examples for solving the problems of the invention, and there is no description about improving the charge-discharge cycle characteristics of lithium-ion batteries.

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
Comparison scheme
Effect test

Embodiment 1

[0084] Using non-aqueous electrolytic solution No. 1 in Table 1, a cycle test and a battery swelling test were performed as follows. The results are shown in Table 2.

[0085] 1. Cyclic test

[0086] A coin-type battery was produced in the following procedure, and the discharge capacity at the 1st cycle and the discharge capacity retention rate (%) at the 20th cycle were measured.

[0087] (1) Production of A1 negative electrode

[0088] Aluminum foil with a thickness of 20 μm was punched into a coin shape with a diameter of 14 mmΦ, and vacuum-dried at 100° C. for 2 hours to make a coin-shaped negative electrode. In the coin-shaped negative electrode, the aluminum element is the negative electrode active material. When the negative electrode is charged and discharged at 1.5 to 0 V using metallic lithium as a counter electrode, the charge and discharge capacity of lithium is 7.5 mAh.

[0089] (2) Production of positive electrode

[0090] Hybrid LiCoO 2 (trade name: HLC-22...

Embodiment 2

[0120] Except having changed the nonaqueous electrolyte solution to the nonaqueous electrolyte solution No. 2 described in Table 1, it carried out similarly to Example 1, and performed the cycle characteristic and the swelling test of a battery. The results are shown in Table 2.

Embodiment 3～15、 comparative example 1～5

[0122] Similarly, batteries were produced using the non-aqueous electrolyte solutions No. 3-20 in Table 1, and the cycle characteristics and battery swelling tests were performed on Examples 3-15 and Comparative Examples 1-5. The results are shown in Table 2.

[0123] Table 2

[0124]

Non-aqueous electrolyte No.

1 cycle discharge capacity [mAh]

Cycle capacity maintenance rate [%]

Battery expansion after charging [ml]

Battery expansion after high temperature storage [ml]

Example 1

1

3.4

60

0.03

0.41

Example 2

2

3.3

55

0.02

0.32

Example 3

3

3.3

50

0.02

0.15

Example 4

4

3.4

45

0.01

0.09

Example 5

5

3.3

40

0.01

0.07

[0125] Example 6

6

3.5

30

0.02

0.05

Example 7

7

3.4

20

0.02

0.04

Examp...

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Abstract

Disclosed is a nonaqueous electrolyte solution suitable for a lithium secondary battery having high energy density wherein capacity decrease due to charge / discharge cycles is extremely small and no gas is generated during the charging / storing period. Specifically disclosed is a nonaqueous electrolyte solution wherein a nonaqueous solvent contains a fluorinated solvent composed of a chain fluorinated carbonate (a1) and a fluorinated ethylene carbonate (a2) in such an amount that the total amount of the fluorinated solvent in the nonaqueous solvent is within a range of 50-100 wt%.

Description

technical field [0001] The present invention relates to an electrolytic solution used for a high-energy-density lithium secondary battery with little capacity drop accompanying charge-discharge cycles. Background technique [0002] Lithium batteries are widely used as power sources for consumer electronics due to their high voltage, high energy density, and high reliability such as storage stability. [0003] A lithium ion secondary battery is mentioned as a representative example of a lithium battery. It is a battery composed of a negative electrode using a carbon material capable of absorbing and releasing lithium as an active material, a positive electrode using a composite oxide of lithium and a transition metal as an active material, and a non-aqueous electrolyte. [0004] Here, the non-aqueous electrolyte plays a role of transferring ions between the positive electrode and the negative electrode. In order to improve the charging and discharging characteristics of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/40H01M4/38H01M4/134H01M10/0525H01M10/0568H01M10/0569H01M10/36
CPCH01M10/0525H01M4/46H01M4/38H01M10/0569H01M4/134H01M10/0568H01M2300/0034H01M6/164H01M2300/0037Y02E60/10H01M10/05
Inventor 野木荣信桧原昭男
Owner MITSUI CHEM INC
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