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Nonaquoeus secondary cell to increase retention rate of discharge capacity

A non-aqueous secondary battery, non-aqueous electrolysis technology, applied in the direction of secondary battery, non-aqueous electrolyte battery, secondary battery repair/maintenance, etc., can solve problems such as hindering electrochemical reaction and reducing discharge capacity.

Inactive Publication Date: 2002-05-22
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Decomposition products hinder the electrochemical re

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Embodiment 1

[0040] Embodiment [embodiment 1] 1) the preparation of non-aqueous electrolytic solution

[0041] LiPF 6 Dissolve in a non-aqueous mixture of ethylene carbonate and methyl ethyl carbonate (EC:MEC=3:7, volume ratio) to obtain a non-aqueous electrolytic solution with a concentration of 1M. 0.2% by weight of bis(4-methoxyphenyl)disulfide and 0.5% by weight of divinylsulfone (based on the amount of the electrolytic solution) were added to the electrolytic solution, respectively. 2) Preparation of lithium secondary battery and measurement of its battery characteristics

[0042] LiCoO 2 (anode active material, 90% by weight), acetylene black (conductive material, 5% by weight), and polyvinylidene fluoride (binder, 5% by weight) were mixed. To the resulting mixture was added 1-methyl-2-pyrrolidone (solvent). The prepared anode mixture is coated on an aluminum foil, dried, cast and pressed, and heated to obtain an anode.

[0043] Artificial graphite (...

Embodiment 2-4

[0053] The non-aqueous electrolytic solution of Example 1 was repeated except that other substituted diphenyl disulfides (listed in Table 1) were used instead of bis(4-methoxyphenyl) disulfide and no divinyl sulfone was used. preparation steps. Using the same method as in Example 1, the prepared non-aqueous electrolytic solution was used to prepare a cylindrical battery.

[0054] The fabrication and evaluation data of the cells are summarized in Table 1.

[0055] Example

Disulfide derivatives (heavy

quantity%)

Other additives

matter (weight%)

initial discharge capacity

Discharge capacity retention rate

(300 cycles)

Example 1

bis(4-methoxyphenyl)

Disulfide (0.2)

Divinyl sulfone (0.5)

1.04

83.5％

Compare implementation

example 1

none

Divinyl sulfone (0.5)

1.00

76.7％

Compare implementation

Example 2

none

1,3-Propanes...

Embodiment 12

[0061] Except for LiNi 0.8 co 0.2 o 2 instead of LiCoO 2 (anode active material), and use the nonaqueous mixture of ethylene carbonate, methyl ethyl carbonate and diethyl carbonate (EC: MEC: DEC=3: 5: 2, volume ratio), repeat embodiment 1 The preparation steps of the non-aqueous electrolytic solution. A cylindrical battery was prepared using the obtained nonaqueous electrolytic solution in the same manner as in Example 1.

[0062] The initial discharge capacity was 1.19 (relative value), and the discharge capacity after 300 charging and discharging stages was 81.3% of the initial discharge capacity. [Example 13]

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Abstract

A discharge capacity retention of a non-aqueous secondary battery is enhanced by incorporating into its non-aqueous electrolytic solution a small amount of a substituted diphenyldisulfide derivative in which each of the diphenyl groups has a substituent such as alkoxy, alkenyloxy, alkynyloxy, cycloalkyloxy, aryloxy, acyloxy, alkanesulfonyloxy, arylsulfonyloxy, alkoxycarbonyloxy, aryloxycarbonyloxy, halogen, CF3, CCl3, or CBr3. Preferably, a small amount of methyl 2-propylcarbonate, 2-propynyl methanesulfonate, 1,3-propanesultone, divinylsulfone, 1,4-butanediol dimethanesulfonate or cyclohexylbenzene is further incorporated.

Description

field of invention [0001] The present invention relates to a nonaqueous secondary battery having improved discharge capacity retention, and to a nonaqueous electrolytic solution which can be advantageously used in the nonaqueous secondary battery. Background of the invention [0002] Currently, non-aqueous secondary batteries such as lithium ion secondary batteries are generally used as power sources for driving small electronic instruments. A nonaqueous secondary battery includes an anode, a nonaqueous electrolytic solution, and a cathode. Non-aqueous lithium-ion secondary batteries preferably include LiCoO 2 , LiMn 2 o 4 or LiNiO 2 A lithium coordination oxide anode, a non-aqueous electrolytic solution, for example, an electrolyte solution in a carbonate solvent, and a carbonaceous material cathode or a lithium metal cathode, wherein the carbonate solvent is, for example, ethylene carbonate ( EC), propylene carbonate (PC), dimethyl carbonat...

Claims

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Application Information

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IPC IPC(8): H01M10/08H01M4/133H01M4/58H01M4/587H01M6/16H01M10/0525H01M10/0567H01M10/0568H01M10/0569H01M10/36H01M10/42
CPCH01M10/4235H01M4/133H01M10/0567H01M10/0568Y02E60/122H01M6/164H01M4/587H01M10/0525H01M10/0569H01M6/166Y02E60/10H01M10/08
Inventor 安部浩司植木明浜本俊一
Owner UBE IND LTD
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