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Electrolyte medium for lithium secondary battery and lithium secondary battery

A lithium secondary battery and electrolyte medium technology, applied in non-aqueous electrolyte batteries, electrolyte battery manufacturing, secondary batteries, etc., can solve problems such as short circuit, cycle deterioration, high porosity, etc., achieve high output, suppress short circuit, and high energy effect of density

Pending Publication Date: 2022-03-18
HONDA MOTOR CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the porosity is high, a slight short circuit will occur, and cycle stability and safety become issues
That is, there is a trade-off relationship between high output and short-circuit suppression. In practice, for example, if a lithium-ion battery is constructed using a non-woven fabric separator with a porosity of 78%, the cycle will deteriorate significantly.
Especially in lithium metal secondary batteries that are prone to short circuits, non-woven separators are predicted to be unsuitable
Therefore, at present, lithium secondary batteries using non-woven fabric separators have not been put into practical use.

Method used

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  • Electrolyte medium for lithium secondary battery and lithium secondary battery
  • Electrolyte medium for lithium secondary battery and lithium secondary battery
  • Electrolyte medium for lithium secondary battery and lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] As the lithium secondary battery of Example 1, a lithium secondary battery having the following configuration was produced. In addition, a charge-discharge test was performed on the produced lithium secondary battery of Example 1 under the following conditions.

[0103]

[0104] Negative electrode: lithium metal

[0105] Positive electrode: lithium cobalt oxide

[0106] Separator: Polypropylene non-woven fabric (porosity 78%)

[0107] Electrolyte medium: 1M LiPF 6 / DMC+1.5% by mass MgO (average particle size: 100μm)

[0108]

[0109] 25℃, 150mAhg -1 -0.5C, 100 cycles

Embodiment 2～4、 comparative example 2

[0119] As the lithium secondary batteries of Examples 2 to 4 and Comparative Example 2, lithium secondary batteries each having the following configurations were fabricated. That is, compared to the lithium secondary battery of Example 1, the lithium secondary batteries of Examples 2 to 4 and Comparative Example 2 correspond to the addition of the high dielectric constant solvent EC to the electrolyte medium. In addition, the content of EC in the electrolyte medium was 20% by mass in Example 2, 10% by mass in Example 3, 0% by mass in Example 4, and 30% by mass in Comparative Example 2. In addition, a charge-discharge test was performed on the fabricated lithium secondary batteries of Examples 2 to 4 and Comparative Example 2 under the following conditions.

[0120]

[0121] Negative electrode: lithium metal

[0122] Positive electrode: lithium cobalt oxide

[0123] Separator: Polypropylene non-woven fabric (porosity 78%)

[0124] Electrolyte medium: 1.2M LiPF 6 / DMC+0.1%...

Embodiment 5～6、 comparative example 3～4

[0129] As the lithium secondary batteries of Examples 5 to 6 and Comparative Examples 3 to 4, lithium secondary batteries each having the following configurations were produced. That is, with respect to the lithium secondary battery of Example 1 described above, the lithium secondary batteries of Examples 5 to 6 and Comparative Examples 3 to 4 are equivalent to replacing the polyvalent cation salt added to the electrolyte medium with Mg(TFS) 2 . In addition, Mg(TFS) in the electrolyte medium 2 The content of is 2.0% by mass in Example 5, 3.0% by mass in Example 6, 0.5% by mass in Comparative Example 3, and 1.0% by mass in Comparative Example 4. In addition, in Comparative Examples 3 to 4, for Mg(TFS) 2 Heating is performed to dissolve in the electrolyte medium, but in Examples 5 to 6, Mg(TFS) is not heated 2 Instead, it forms a state of suspension in the electrolyte medium. If placed (Mg(TFS) 2 ), then dispersed into particles (MgPF 6 ) 2 , whose average particle size i...

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Abstract

The problem addressed by the present invention is to provide a lithium secondary battery capable of suppressing short circuits and having high energy density and high output. In order to solve the problem, the present invention provides an electrolyte medium for a lithium secondary battery, which contains a low dielectric constant solvent, a lithium salt, and a multivalent cation salt, the multivalent cation salt being contained in the electrolyte medium in a state dispersed into particles and in an unfixed flow state, and the content of a high dielectric constant solvent being 20 mass% or less. According to the lithium secondary battery provided with the electrolyte medium for the lithium secondary battery, short circuit can be suppressed, and high energy density and high output can be obtained.

Description

technical field [0001] The invention relates to an electrolyte medium for a lithium secondary battery and the lithium secondary battery. Background technique [0002] Conventionally, in a lithium secondary battery utilizing a redox reaction of lithium, it is known that a short circuit occurs between positive and negative electrodes because lithium is precipitated in the form of dendrites. Therefore, for example, in a lithium ion secondary battery, a graphite negative electrode in which lithium ions are intercalated and deintercalated and a microporous sheet-like separator are used to suppress such a short circuit, and thus put into practical use. However, in recent years, storage batteries for automobiles and storage batteries for drones are expected to have energy density and high output exceeding that of lithium ion secondary batteries. [0003] Therefore, in order to increase the energy density, the utilization of lithium metal, which is the material with the highest ene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0562H01M10/0525
CPCH01M10/0562H01M10/0525H01M10/052H01M4/382H01M4/405H01M10/058H01M2300/0085H01M10/0565H01M10/0569H01M10/0567H01M2300/0025Y02E60/10H01M10/0568H01M4/134H01M2004/027H01M50/44H01M2300/0028
Inventor 小笠博司栗原英纪稲本将史
Owner HONDA MOTOR CO LTD