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Lithium secondary battery

A lithium secondary battery and electrolyte technology, which is applied in secondary batteries, lithium batteries, battery electrodes, etc., can solve the problems of lithium ion influence, solvent decomposition, and inability to insert lithium ions, etc., and achieve the effect of excellent cycle characteristics

Pending Publication Date: 2020-09-18
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the reaction of lithium ions inserted into the graphite layer is greatly affected by the electrolyte solvent.
Lithium secondary batteries usually use carbonate as a solvent from the perspective of the width of the potential window (reduction resistance, oxidation resistance), viscosity, and ion conductivity when lithium salts are dissolved. However, propylene carbonate Cyclic carbonates obtained by replacing one hydrogen atom with an alkyl group such as , butylene carbonate, etc., will decompose the solvent and cannot intercalate lithium ions.

Method used

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Examples

Experimental program
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Effect test

Embodiment approach

[0059] figure 1 A cross section of a lithium secondary battery according to an embodiment of the present disclosure is shown. Lithium secondary battery 10 includes positive electrode 20 , negative electrode 30 , and electrolytic solution 50 . The electrolytic solution 50 contains a solvent and a negative electrode mediator, and is in contact with the positive electrode 20 and the negative electrode 30 . A negative electrode medium is dissolved in the solvent of the electrolytic solution 50 . The negative electrode 30 has a negative electrode current collector 31 and a negative electrode active material 32 . The oxidation-reduction reaction of the negative electrode active material 32 in the negative electrode 30 proceeds through the negative electrode mediator.

[0060] The lithium secondary battery 10 further includes a container 60 . Container 60 is sealed. The container 60 is made of insulating and corrosion-resistant material. The positive electrode 20 , the negative...

Embodiment 1

[0197] A 2×2 cm copper foil (a) was covered with a polypropylene microporous separator (b), and the whole was covered with a large amount of lithium metal foil (c). Next, tabs are respectively installed on the copper foil and the lithium metal to form an electrode group. Then, it was housed in a laminated case (d), and after injecting an ether solution (e) in which biphenyl was dissolved at 0.1 mol / L, the opening of the laminated case was thermally welded and sealed to produce figure 2 Shown is a battery cell for potentiometric measurements.

[0198] The solvent of the ether solution contains 2methyltetrahydrofuran as a cyclic ether, and triglyme as glyme. The ratio of the volume of triglyme to the volume of the solvent of the ether solution was 0.2. In other words, the ratio of the volume of 2-methyltetrahydrofuran to the volume of triglyme was 8:2. In the ether solution, 1mol / L LiPF was dissolved as a supporting salt 6 . As described above, the battery cell 1 for poten...

Embodiment 2

[0203] Prepared LiFePO containing 8mAh equivalent as positive electrode active material 4 , 2 mAh equivalent Al foil as the negative electrode active material, rough surfaced copper foil as the negative electrode current collector, lithium salt as the electrolyte, and 2-methyltetrahydrofuran solution of biphenyl. made with figure 1 Lithium secondary battery shown. The positive electrode is covered with a separator made of a microporous membrane. LiPF is used as lithium salt 6 . LiPF in electrolyte 6 The concentration is 1mol / L. The concentration of biphenyl in the electrolyte solution was adjusted to 0.00625 mol / L, 0.0125 mol / L, 0.025 mol / L or 0.05 mol / L to obtain 4 lithium secondary batteries.

[0204] A charge-discharge test of the obtained lithium secondary battery was performed. A charge-discharge test was performed under the conditions of a charge-discharge current of 1 mA, a charge time of 2 hours, and a cut-off voltage of 2 V during discharge. The results are sh...

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Abstract

This lithium secondary battery (10) comprises: a negative electrode (30) having a negative electrode current collector (31) and a negative electrode active substance (32); an electrolyte solution (50); and a positive electrode (30) having a positive electrode active substance layer (22) disposed on a positive electrode current collector (21). The negative electrode (30) contains a material that forms an alloy with lithium during charging. The electrolyte solution (50) contains lithium ions and counter anions thereof, contains at least one substance selected from the group consisting of phenanthrene, biphenyl, triphenylene, acenaphthene, acenaphthylene, fluoranthene, and benzil in an amount of 0.00625 to 0.05 mol / L, and contains at least one selected from the group consisting of cyclic ethers, glymes, and sulfolane as a solvent.

Description

technical field [0001] The present disclosure relates to lithium secondary batteries. Background technique [0002] The characteristics of lithium secondary batteries vary depending on the type of active material. For example, if lithium metal is used as the negative electrode active material, a lithium secondary battery with high energy density can be obtained. However, if lithium metal is used as the negative electrode active material, lithium metal precipitates in a dendrite form during charging of the lithium secondary battery, which may cause an internal short circuit. In addition, the deposited lithium metal is generated in the form of atomic groups, so it is very active. The precipitated lithium metal reacts with the solvent of the electrolytic solution, and part of it becomes an inert organolithium compound, so there is a problem that the charge-discharge efficiency decreases. In order to suppress the reactivity with solvents, various types of solvents have been s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M2/16H01M4/38H01M4/42H01M4/44H01M4/46H01M10/052H01M10/0569H01M50/417H01M50/497
CPCH01M10/052H01M10/0567H01M10/0569H01M4/38Y02E60/10H01M2004/027H01M4/134H01M2300/0028H01M50/497H01M50/417H01M4/382H01M4/386H01M10/0525H01M2300/0037
Inventor 藤本正久
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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