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Nonaqueous electrolyte solution for secondary batteries and lithium ion secondary battery

A non-aqueous electrolyte, secondary battery technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, battery electrodes and other directions, can solve the problems of battery damage, thermal runaway, etc. Effect

Inactive Publication Date: 2015-06-24
ASAHI GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Generally, the battery temperature rises due to Joule heat when the secondary battery is in use, and if the battery temperature reaches a high temperature exceeding 150°C, thermal runaway may occur and the battery may be damaged

Method used

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  • Nonaqueous electrolyte solution for secondary batteries and lithium ion secondary battery
  • Nonaqueous electrolyte solution for secondary batteries and lithium ion secondary battery
  • Nonaqueous electrolyte solution for secondary batteries and lithium ion secondary battery

Examples

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Effect test

example 1

[0286] After diffusing LPF (0.15g) as a lithium salt into AE3000 (0.31g) and HFE5510 (0.54g) as a fluorinated solvent (A), mix GBL (0.34g) as a cyclic carboxylate compound (B) ) and DMC (0.15 g) as further solvent, a homogeneous solution was obtained. Then, LiFOB, which is a lithium salt, was added to this solution at a concentration of 2% by mass to prepare a non-aqueous electrolytic solution 1 .

[0287] The content of each component in the non-aqueous electrolytic solution 1 is shown in Table 1.

[0288] The positive electrode and the negative electrode were made to face each other, and a polyolefin-based microporous membrane as an electrode separator for evaluation was present between the electrodes, and the non-aqueous electrolytic solution 1 (0.1 mL) was added to form a LiCoO 2 Electrode - a battery cell 1 formed of a graphite electrode.

example 2～21

[0290] Nonaqueous electrolytic solutions 2 to 21 were obtained in the same manner as in Example 1 except that the composition of each compound such as lithium salt was changed as shown in Table 1. In addition, battery cells 2 to 21 were fabricated in the same manner as in Example 1 except that nonaqueous electrolytic solutions 2 to 21 were used instead of nonaqueous electrolytic solution 1 .

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Abstract

To provide a non-aqueous electrolyte solution for secondary batteries, which has a low reactivity with a positive electrode and a negative electrode and which is excellent in stability to prevent thermal runaway of a secondary battery and excellent also in battery properties such as cycle properties and rate properties, and a lithium ion secondary battery employing such a non-aqueous electrolyte solution. A non-aqueous electrolyte solution for secondary batteries, comprising a lithium salt composed of a specific complex such as lithium difluoro(oxalato)borate, a fluorinated solvent (A) containing at least one member selected from the group consisting of a fluorinated ether compound, a fluorinated chain carboxylic acid ester compound and a fluorinated chain carbonate compound, and a cyclic carboxylic acid ester compound (B); and a lithium ion secondary battery employing such a non-aqueous electrolyte solution.

Description

technical field [0001] The invention relates to a nonaqueous electrolytic solution for a secondary battery and a lithium ion secondary battery. Background technique [0002] As non-aqueous electrolytic solutions for lithium-ion secondary batteries (hereinafter also simply referred to as "secondary batteries"), those formed of, for example, fluorine-containing solvents, cyclic carbonate compounds, cyclic carboxylate compounds, and lithium salts have been proposed. Non-aqueous electrolytic solution (see Patent Documents 1, 2, etc.). [0003] Generally, when the secondary battery is in use, the battery temperature rises due to Joule heat, and if the battery temperature exceeds 150° C., thermal runaway may occur and the battery may be damaged. As a main cause of occurrence of thermal runaway, it is known that an electrolytic solution reacts with a positive electrode and a negative electrode to generate heat generated by their decomposition. That is, when the temperature of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0569H01M10/052H01M10/0568
CPCH01M10/052H01M10/0568H01M10/0569H01M10/4235H01M10/0525H01M10/0567H01M2300/0034H01M2300/0037Y02E60/10H01M4/382H01M4/587H01M2220/20
Inventor 小野崎祐岩谷真男
Owner ASAHI GLASS CO LTD
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