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Lighium ion secondary battery

A secondary battery, lithium ion technology, applied in secondary batteries, secondary battery repair/maintenance, battery electrodes, etc., can solve the problems of reducing, increasing internal resistance capacity, no memory effect, etc., to achieve improved storage performance, satisfactory The effect of capacitance and satisfactory cycle performance

Inactive Publication Date: 2004-08-04
NEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] 5. No memory effect (no problem in repeated partial discharge)
[0052] 2. Due to the formation of protrusions, the gap between the cathode and the anode increases, thereby increasing the internal resistance (decrease in capacity)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Preparation of electrolytic solution

[0117] Propylene carbonate (PC) and ethyl methyl carbonate (EMC) were mixed at a weight ratio of 40:60 to prepare a non-aqueous solvent. To this solvent was added 1,3-propane sultone (PS) up to 1 wt%. LiPF 6 Dissolve in the mixture to 1M to obtain an electrolytic solution.

[0118] Manufacture of lithium-ion secondary batteries

[0119] The cathode is fabricated in this way, including mixing 89wt% lithium manganese spinel (LiMn 2 o 4 , cathode activator), 7wt% of conductive carbon (acetylene black; conductive agent) and 4wt% of polyvinylidene fluoride (binder), N-methyl-2-pyrrolidone (NMP) was added to the mixture as a solvent , the mixture is applied to aluminum foil, which is then dried, pressed and heated.

[0120] The anode was manufactured in this way, comprising mixing 89 wt % of non-graphitizable carbon (Kureha Chemical Industry Co. Ltd., trade name: Carbotron P (F), anode activator), 10 wt % of conductive carbon (...

Embodiment 2

[0129] A secondary battery was prepared as in Example 1, except that 1,3-pyrrolidone (PS) was added to 2 wt%.

Embodiment 3

[0131] A secondary battery was prepared as in Example 1, except that 1,3-pyrrolidone (PS) was added to 3 wt%.

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Abstract

This invention provides a lithium ion secondary battery comprising a cathode, an anode and an nonaqueous electrolytic solution in which an electrolyte is dissolved in a nonaqueous solvent, wherein the anode comprises a non-graphitizable carbon as an anode activator; and the nonaqueous electrolytic solution comprises at least one anode protecting component selected from the group consisting of sultones having a 5- to 7-membered cyclic sulfonate structure and their substituted derivatives as well as vinylene carbonates and their substituted derivatives.

Description

technical field [0001] The present invention relates to lithium ion secondary batteries. Background technique [0002] Electronic devices have become downsized and portable, and nonaqueous electrolyte secondary batteries, particularly lithium ion secondary batteries, have been frequently used as portable electronic devices such as portable phones and mobile terminals. [0003] Also, the rapid growth of automobiles has caused serious global problems such as air pollution, global environmental pollution including emission of carbon dioxide, and energy depletion. Electric vehicles hold the promise of improving these problems. [0004] Batteries for electric vehicles must satisfy such battery properties as output density, long life, and energy density. [0005] Lithium ion secondary batteries are mainly of interest because of their improved output performance and their light weight. [0006] Common features of lithium ion secondary batteries are described below. [0007] adv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/133H01M4/58H01M4/587H01M4/60H01M10/0525H01M10/0567H01M10/36H01M10/42
CPCH01M2004/027H01M10/4235H01M10/0567Y02E60/122Y02T10/7011H01M10/0525H01M4/133H01M4/587Y02E60/10Y02P70/50C02F1/68C02F1/001C02F1/005C02F2301/024Y02T10/70
Inventor 西山淳子三浦环宇津木功二
Owner NEC CORP
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