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Lithium secondary battery and electrolyte solution for lithium secondary battery

A lithium secondary battery and electrolyte technology, applied to secondary batteries, battery electrodes, lithium batteries, etc., to achieve the effect of improving cycle characteristics

Active Publication Date: 2019-03-19
ADEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to form a stable coating with a uniform thickness that can sufficiently suppress degradation of cycle characteristics associated with use on a silicon-based negative electrode active material.

Method used

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  • Lithium secondary battery and electrolyte solution for lithium secondary battery
  • Lithium secondary battery and electrolyte solution for lithium secondary battery
  • Lithium secondary battery and electrolyte solution for lithium secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] [Production of lithium secondary battery]

[0087] As the negative electrode active material, a silicon-based negative electrode active material in which carbon coating is formed on the surface of silicon-based particles in which silicon is dispersed in amorphous silicon oxide (SiOx, 0<x≤2) was obtained. The mass ratio of silicon, amorphous silicon oxide, and carbon in the silicon-based negative electrode active material was 29:61:10. This negative electrode active material and polyamic acid, which is a precursor of polyimide as a negative electrode binder, were measured at a mass ratio of 90:10, and mixed with n-methylpyrrolidone to prepare a negative electrode slurry. The negative electrode slurry was coated on a copper foil having a thickness of 10 μm, dried, and further heat-treated at 300° C. in a nitrogen atmosphere to prepare a negative electrode.

[0088] Lithium nickelate (LiNiO) as the positive electrode active material 0.80 co 0.15 Al 0.05 o 2 ), carbon ...

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Abstract

The present invention provides: a lithium secondary battery which is suppressed in deterioration of a negative electrode active material due to charging and discharging and has excellent cycle characteristics, while having a long service life especially for use in a high-temperature environment; and an electrolyte solution which is used in this lithium secondary battery. A lithium secondary battery according to the present invention contains an electrolyte solution, in which a positive electrode and a negative electrode that absorb and desorb lithium during charging and discharging are immersed, and has a negative electrode that contains a silicon-based negative electrode active material. The electrolyte solution contains an unsaturated phosphoric acid ester that is represented by formula (1) (wherein each of R1-R3 independently represents a direct bond or an alkylene group having 1-5 carbon atoms).

Description

technical field [0001] The present invention relates to a high-capacity lithium secondary battery that is particularly excellent in cycle characteristics for use in a high-temperature environment and has a long life, and an electrolyte solution for the lithium secondary battery used therein. Background technique [0002] Lithium secondary batteries are widely used in portable electronic devices, personal computers, etc., and require miniaturization and light weight. On the other hand, high energy density and degradation associated with charging and discharging are required to be used in high-function electronic devices and electric vehicles. It is suppressed and has excellent cycle characteristics and long life. A lithium battery has a structure in which a positive electrode active material layer containing a positive electrode active material and a negative electrode active material layer containing a negative electrode active material respectively formed on a current colle...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M10/052H01M4/38H01M4/48H01M10/0567
CPCH01M4/386H01M10/052H01M10/0567H01M2300/0025Y02E60/10
Inventor 桥诘洋子井上和彦须藤信也须黑雅博志村绿泷敬之渡边裕知渋谷厚辉
Owner ADEKA CORP
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