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Nonaqueous electrolyte solution and nonaqueous electrolyte secondary battery

A non-aqueous electrolyte, carbon number technology, applied in non-aqueous electrolyte storage batteries, secondary batteries, non-aqueous electrolytes and other directions, can solve the problems such as cyclic sulfonate compounds are not disclosed or given teachings and the like

Pending Publication Date: 2021-03-09
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, regarding these additives, there is absolutely no disclosure or teaching about the combined use of cyclic sulfonate-based compounds and the like.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1～1-25 and comparative example 1-1～1-13

[0267] Using the electrolyte described in Table 1, with LiNi 0.8 co 0.1 mn 0.1 o 2 As the positive electrode material, graphite (containing silicon) is used as the negative electrode material to manufacture batteries, and the discharge capacity retention rate and internal resistance characteristics after storage are evaluated. The evaluation results are shown in Table 4. In addition, the test battery was produced as follows.

[0268] In LiNi 0.8 co 0.1 mn 0.1 o 2 5% by mass of polyvinylidene fluoride (hereinafter referred to as "PVDF") as a binder and 5% by mass of acetylene black as a conductive material were mixed with 90% by mass of the powder, and N-methylpyrrolidone was added to form a paste. This paste was applied on an aluminum foil and dried to prepare a test positive electrode body.

[0269] In addition, 5% by mass of silicon powder and 10% by mass of PVDF were mixed with 85% by mass of graphite powder as a binder, and N-methylpyrrolidone was further added to...

Embodiment 2-1～2-20

[0282] Except for using the electrolytic solutions described in Table 2, batteries were produced in the same manner as in Example 1-1, and the capacity retention rate during storage and the internal resistance characteristics after storage were evaluated. The evaluation results are shown in Table 5.

[0283] [table 5]

[0284]

[0285] The evaluation results of each example are relative values ​​with the evaluation results of Comparative Example 1-1 being 100. The larger the value of "capacity retention rate during storage", the more desirable, and the smaller the value of "internal resistance characteristics after storage", the better. ideal.

[0286] According to the evaluation results in Table 5, it can be confirmed that compared with the case where LiFSI and (II) components are used in combination, when the (I) component and (II) component of the present invention are used in combination, the high-temperature storage characteristics can be improved in a well-balanced m...

Embodiment 3-1～3-14 and comparative example 3-1

[0288] Except for using the electrolytic solutions described in Table 3, batteries were produced in the same manner as in Example 1-1, and the capacity retention rate during storage and the internal resistance characteristics after storage were evaluated. The evaluation results are shown in Table 6.

[0289] [Table 6]

[0290]

[0291] The evaluation results of each example are relative values ​​with the evaluation results of Comparative Example 3-1 being 100. The larger the value of "capacity retention rate during storage", the more desirable, and the smaller the value of "internal resistance characteristics after storage", the better. ideal.

[0292] From the evaluation results in Table 6, it can be confirmed that compared with Comparative Example 3-1 in which no component (I) was added, when the components (I) and (II) of the present invention are used in combination, the high-temperature storage characteristics can be improved in a well-balanced manner ( Capacity rete...

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Abstract

The present invention provides: a nonaqueous electrolyte solution which is capable of improving the storage characteristics at high temperatures and the internal resistance characteristics after storage in a more balanced manner; and a nonaqueous electrolyte secondary battery which is provided with this nonaqueous electrolyte solution. A nonaqueous electrolyte solution according to the present invention contains (I) imide anions of general formula (1) or (2), (II) a sulfonic acid ester compound represented by general formula (3), (III) a nonaqueous organic solvent or an ionic liquid, and (IV)a solute.

Description

technical field [0001] The present invention relates to a nonaqueous electrolytic solution and a nonaqueous electrolytic solution secondary battery. Background technique [0002] So far, as means for improving the durability of non-aqueous electrolyte secondary batteries, studies have been conducted on the optimization of various battery components including active materials for positive and negative electrodes. Non-aqueous electrolytes are no exception, and various durability-enhancing agents have been proposed to suppress deterioration caused by decomposition of the electrolyte on the surface of active positive and negative electrodes. [0003] For example, in Patent Document 1, in order to improve the high temperature characteristics and life characteristics (cycle characteristics) of lithium batteries, it is disclosed that the electrolyte solution contains Sulfonate compounds are used as additives. Furthermore, it is also disclosed that the above electrolytic solution ...

Claims

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Application Information

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IPC IPC(8): H01M10/0568H01M10/0567
CPCH01M10/0567Y02E60/10H01M2300/0045H01M10/0525H01M10/054H01M2300/0025H01M10/0568H01M10/052H01M2300/004
Inventor 森中孝敬河原圭河端涉森克将高桥幹弘
Owner CENT GLASS CO LTD
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