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lithium secondary battery

A lithium secondary battery and lithium borofluoride technology, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as unmentioned or unmentioned high-temperature cycle characteristics, and achieve excellent overcharge characteristics and excellent charging performance. Effect of discharge cycle characteristics

Active Publication Date: 2020-12-01
MAXELL HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, there is no mention of high-temperature cycle characteristics in Patent Documents 1 to 3. In addition, in Patent Document 2, although the effect of nitrile compounds on the positive electrode is mentioned, it does not mention the negative electrode and nitrile as described in the present application. effect
Furthermore, there is room for improvement in various characteristics by increasing the charging upper limit voltage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105]

[0106] LiCoO 2 100 parts by mass, 20 parts by mass of NMP solution containing PVDF as a binder at a concentration of 10 mass%, 1 part by mass of artificial graphite as a conductive additive, and 1 part by mass of Ketjen Black were kneaded with a twin-screw mixer, NMP was further added to adjust the viscosity to prepare a paste containing positive electrode mixture.

[0107] The positive electrode mixture-containing paste was coated on both sides of an aluminum foil (positive electrode current collector) with a thickness of 15 μm, and then vacuum-dried at 120° C. for 12 hours to form positive electrode mixture layers on both sides of the aluminum foil. Then, pressure treatment was performed to adjust the thickness and density of the positive electrode mixture layer, and an aluminum lead body was welded to the exposed portion of the aluminum foil to produce a strip-shaped positive electrode with a length of 600 mm and a width of 54 mm. The thickness of each side of t...

Embodiment 2～8

[0121] The amount of the complex obtained by coating the surface of SiO with a carbon material, adiponitrile, LiBF 4 Except having changed the content of each as shown in Table 1, it carried out similarly to Example 1, and produced the lithium secondary battery.

Embodiment 9

[0123]

[0124] The amount of the Si powder when the total of the Si powder and the graphite is 100% by mass when the Si powder as the material S and the graphite having an average particle diameter D50% of 16 μm as a carbon material capable of occluding and releasing lithium ions becomes A mixture of 0.1% by mass: 99.0 parts by mass, SBR as a binder: 1.5 parts by mass, and CMC as a thickener: 1 part by mass was added to water and mixed to prepare a negative electrode mixture-containing paste. A negative electrode was produced in the same manner as in Example 1, except that this negative electrode mixture-containing paste was used.

[0125]

[0126] In a mixed solvent with a volume ratio of ethylene carbonate and diethyl carbonate of 3:7, the LiPF 6 Dissolve at a concentration of 1.1 mol / l, and add the following substances in the following amounts: adiponitrile to 0.1% by mass, lithium borofluoride (LiBF 4 ) was 1.0% by mass, VC was 2% by mass, and FEC was 2% by mass to p...

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Abstract

An object of the present invention is to provide a lithium secondary battery that exhibits excellent charge-discharge cycle characteristics at high temperatures, and is excellent in high-temperature storage characteristics and overcharge characteristics. The method for solving the above-mentioned problems is a lithium secondary battery using a positive electrode, a negative electrode, a separator and a non-aqueous electrolyte, the positive electrode contains a lithium-containing oxide containing Co and / or Mn, and the negative electrode contains a specific amount of , a carbon material that emits lithium ions, and a material S containing at least one element selected from the group consisting of Si and Sn, the non-aqueous electrolyte contains a specific amount of compound A as a specific nitrile compound, and a material S selected from the group consisting of LiBF 4 (lithium borofluoride), LiN(SO 2 F) 2 , LiN(CF 3 SO 2 ) 2 , at least one compound B from the group consisting of LiBOB (lithium dioxalate borate) and LiDFOB (lithium difluorooxalate borate).

Description

technical field [0001] The present invention relates to a lithium secondary battery that has excellent charge-discharge cycle characteristics, storage characteristics, and excellent overcharge characteristics even in a high-temperature state. Background technique [0002] In recent years, with the development of portable electronic devices such as mobile phones and notebook computers, and the practical use of electric vehicles, lithium secondary batteries that are small, lightweight and high-capacity are required. Furthermore, with regard to the lithium secondary battery, along with the expansion of its application equipment, etc., it is necessary to improve various battery characteristics in order to increase the capacity. [0003] Non-aqueous electrolyte secondary batteries are high-voltage and high-capacity, so high expectations are placed on their development. In the negative electrode active material of the non-aqueous electrolyte secondary battery, in addition to Li (...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/38H01M4/36H01M10/0568H01M10/0567H01M10/0525H01M4/48H01M4/587H01M10/052
CPCH01M4/364H01M4/386H01M4/387H01M4/505H01M4/525H01M10/0525H01M10/0567H01M10/0568Y02E60/10
Inventor 川边启佑上剃春树阿部浩史后藤大辅柴贵子
Owner MAXELL HLDG LTD
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