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Nonaqueous electrolyte solution for secondary batteries and nonaqueous electrolyte secondary battery

A technology of non-aqueous electrolyte and secondary battery, which is applied in the field of non-aqueous electrolyte for secondary battery and non-aqueous electrolyte secondary battery, can solve the problems of insufficient battery resistance battery characteristics and insufficient properties, and achieve improvement Charge and discharge characteristics, improve thermal stability, and prevent deterioration

Inactive Publication Date: 2015-10-28
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for 1,3-propane sultone, 2-methylisothiazolidine-1,1-dioxide, and N-acylsulfonamide derivatives disclosed in Patent Documents 1 to 3, it was found that The effect of suppressing battery expansion due to gas generation during storage at high charging voltage and high temperature, but battery characteristics such as battery resistance at low temperatures below 0°C are not sufficient. In addition, for ethylene glycol sulfuric acid disclosed in Patent Document 4 Esters, although the effect of improving characteristics such as battery resistance at low temperature is found, but promote gas generation during high temperature storage
It is considered that when these compounds ensure battery characteristics in a wide temperature range, the properties of the film formed on the electrode are not sufficient.

Method used

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  • Nonaqueous electrolyte solution for secondary batteries and nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte solution for secondary batteries and nonaqueous electrolyte secondary battery
  • Nonaqueous electrolyte solution for secondary batteries and nonaqueous electrolyte secondary battery

Examples

Experimental program
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Effect test

Embodiment 1

[0111] [Preparation of Electrolyte Solution]

[0112] Using LiPF 6 as an electrolyte. A solvent composed of a mixture containing 30% by volume of ethylene carbonate and 70% by volume of ethyl methyl carbonate was used. Dissolve LiPF in this solvent 6 It was adjusted to 1.0 mol / l, and a cyclic amide compound composed of N-acylsulfonate was added as an additive for forming an ion-conductive film on the electrode. In Example 1-1, 1.0% by weight of 3,6-dimethyl-3,4-dihydro-1,2,3- Thiazin-4-one 2,2-dioxide, in Example 1-2, 1.0% by weight of 6-methyl-3,4-dihydro-1,2 ,3- Thiazin-4-one 2,2-dioxide lithium salt, in Example 1-3, 1.0% by weight of 3-fluoro-6-methyl-3,4- Dihydro-1,2,3- Thiazin-4-one 2,2-dioxide, in Examples 1-4, 1.0% by weight of 5-fluoro-3-methyl-1,2,3- Thiazin-4-one 2,2-dioxide lithium salt, in Examples 1-5, 1.0% by weight of 6-methyl-3,4-dihydro-1 was added to 100% by weight of the solvent as a whole ,2,3- Thiazin-4-one 2,2-dioxide to obtain an electroly...

Embodiment 2-1～2-8

[0135] Regarding the fabricated examples 2-1 to 2-8, batteries were produced by the same method as in example 1-1, and 3,6-dimethyl-3,4-dihydro-1,2,3- The content of thiazin-4-one 2,2-dioxide was set to the amount shown in Table 2.

[0136] [Table 2]

[0137]

[0138] EC: ethylene carbonate

[0139] EMC: ethyl methyl carbonate

[0140] As shown in Table 2, the reaction resistance at low temperature increases with 3,6-dimethyl-3,4-dihydro-1,2,3- As the content of thiazin-4-one 2,2-dioxide increased, the resistance value decreased and showed a tendency to increase after showing a minimum value. In addition, the expansion rate at high temperature increases with 3,6-dimethyl-3,4-dihydro-1,2,3- The content of thiazin-4-one 2,2-dioxide increased and its swelling rate decreased. Therefore, according to the 3,6-dimethyl-3,4-dihydro-1,2,3- Examples 2-2 to 2-7 in which the content of thiazin-4-one 2,2-dioxide is set to be 0.05% by weight or more and 10% by weight or less, co...

Embodiment 3-1～3-3

[0142] In Example 3-1, except for 3,6-dimethyl-3,4-dihydro-1,2,3- In addition to thiazin-4-one 2,2-dioxide, 0.5% by weight of 2-acryloyloxyethyl isocyanate is added to the electrolyte composition. In Example 3-2, 0.5% by weight of 1, The electrolyte composition of 1-bis(acryloyloxymethyl) ethyl isocyanate, in embodiment 3-3, adopts the composition of electrolyte adding 0.5% by weight of 2-methacryloyloxyethyl isocyanate, except Otherwise, batteries were manufactured in the same manner as in Example 1-1, and the results of measuring the reaction resistance at low temperature and high temperature characteristics are shown in Table 3.

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Abstract

[Solution] With respect to a nonaqueous electrolyte solution for secondary batteries containing an electrolyte, a solvent and an additive, and a nonaqueous electrolyte secondary battery which is provided with the nonaqueous electrolyte solution, the additive contains a compound represented by formula (I). (In formula (I), n represents an integer of 1-4; R1 represents a halogen atom or the like if n = 1, represents an alkaline earth metal atom or the like if n = 2, represents a trivalent transition metal atom or the like if n = 3, and represents a tetravalent transition metal atom or the like if n = 4; and R2 represents an alkylene group having 1-6 carbon atoms or an alkenylene group having 2-6 carbon atoms.) [Effect] A nonaqueous electrolyte secondary battery using a nonaqueous electrolyte solution for secondary batteries according to the present invention has high low-temperature characteristics, while having high high-temperature characteristics.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte solution for secondary batteries and a nonaqueous electrolyte solution secondary battery, in particular, to a nonaqueous electrolyte solution secondary battery excellent in charge and discharge characteristics, and the nonaqueous electrolyte solution secondary battery Non-aqueous electrolyte used in secondary batteries. Background technique [0002] In recent years, metal lithium, or alloys or carbon materials capable of absorbing or releasing lithium ions have been used as negative electrode active materials, and the chemical formula LiMO 2 (M is a transition metal), a lithium-containing transition metal oxide, lithium iron phosphate having an olivine structure, or the like as a positive electrode material has attracted attention as a battery having a high energy density. [0003] As the electrolytic solution used for the non-aqueous electrolytic solution, LiPF dissolved as an electrolyte in a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0567H01M10/05H01M10/0568H01M10/0569
CPCH01M10/0567H01M4/131H01M4/133H01M10/052H01M10/0568H01M10/0569Y02E60/122Y02T10/7011Y02E60/10H01M10/0525H01M2220/20H01M2220/30H01M2300/0028Y02T10/70
Inventor 齐藤俊介青木优介川本健埜村清志内条秀一
Owner SHOWA DENKO KK
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