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CN-116368633-B - Alkoxysilyl compound, additive for nonaqueous electrolyte solution containing same, and nonaqueous electrolyte solution secondary battery

CN116368633BCN 116368633 BCN116368633 BCN 116368633BCN-116368633-B

Abstract

The alkoxysilyl compound has 2 or more silyl groups linked by a chain containing an ether group, and the 2 or more silyl groups each have at least 1 selected from the group consisting of an alkoxy group and an oxyalkyl group. The alkoxysilyl compound is added to the nonaqueous electrolytic solution as an additive for the nonaqueous electrolytic solution.

Inventors

  • Chai Tianxiang
  • Suzuki expands wise man
  • SAKATA MOTOHIRO

Assignees

  • 松下知识产权经营株式会社

Dates

Publication Date
20260505
Application Date
20211028
Priority Date
20201030

Claims (8)

  1. 1. An additive for a nonaqueous electrolytic solution, which comprises an alkoxysilyl compound which is a bis (alkoxysilylalkyl) ether represented by the general formula (1), R1 is represented by R11- (O-R12) n -O-R13, R11, R12 and R13 are each independently an alkylene group having 2 to 4 carbon atoms, n is an integer of 0 to 2, R2 to R7 are each an alkoxy group having 1 to 3 carbon atoms.
  2. 2. The additive for a nonaqueous electrolytic solution according to claim 1, wherein, R1 is-C 3 H 6 -O-C 3 H 6 -or-C 2 H 4 -O-C 2 H 4 -O-C 3 H 6 -.
  3. 3. The additive for nonaqueous electrolytic solutions according to claim 1 or2, wherein, R2 to R7 are methoxy groups.
  4. 4. A nonaqueous electrolyte comprising a nonaqueous solvent, a salt dissolved in the nonaqueous solvent, and the additive for nonaqueous electrolyte according to any one of claims 1 to 3.
  5. 5. The nonaqueous electrolytic solution according to claim 4, wherein the concentration of the additive for nonaqueous electrolytic solution is 10% by mass or less.
  6. 6. The nonaqueous electrolytic solution according to claim 4 or 5, wherein the concentration of the additive for nonaqueous electrolytic solution is 0.05% by mass or more.
  7. 7. A nonaqueous electrolyte secondary battery comprising a negative electrode having a negative electrode mixture layer, a positive electrode, and the nonaqueous electrolyte according to any one of claims 4 to 6, The negative electrode mixture layer contains a negative electrode active material, The negative electrode active material contains a material containing a silicon element.
  8. 8. The nonaqueous electrolyte secondary battery according to claim 7, wherein, The material containing silicon element is a composite material, The composite material comprises a lithium ion conductive phase and a silicon phase dispersed in the lithium ion conductive phase.

Description

Alkoxysilyl compound, additive for nonaqueous electrolyte solution containing same, and nonaqueous electrolyte solution secondary battery Technical Field The present disclosure relates to an alkoxysilyl compound and an additive for a nonaqueous electrolyte solution containing the same, and a nonaqueous electrolyte solution and a nonaqueous electrolyte secondary battery containing the same. Background A material containing silicon element is expected to be a high-capacity negative electrode material for a secondary battery. However, since the material containing silicon is large in expansion and contraction due to charge and discharge, side reactions are easily induced, and the capacity retention rate in charge and discharge cycles is easily lowered. Non-patent document 1 reports that the capacity retention rate in charge and discharge cycles is improved by adding a vinyl-containing silane coupling agent to an electrolyte of a monopolar battery using a Si/C composite. Prior art literature Non-patent literature Non-patent document 1 Ionics,2018,24,3691-3698 Disclosure of Invention Problems to be solved by the invention However, in the proposal of non-patent document 1, it is difficult to stably improve the capacity retention rate in the charge-discharge cycle. Solution for solving the problem One aspect of the present disclosure relates to an alkoxysilyl compound having 2 or more silyl groups connected by a chain including an ether group, the aforementioned 2 or more silyl groups each having at least 1 selected from the group consisting of an alkoxy group and an oxyalkyl group. Another aspect of the present disclosure relates to an additive for a nonaqueous electrolytic solution, which comprises the above alkoxysilyl compound. Still another aspect of the present disclosure relates to a nonaqueous electrolytic solution comprising a nonaqueous solvent, a salt dissolved in the nonaqueous solvent, and the additive for nonaqueous electrolytic solution. A further aspect of the present disclosure relates to a nonaqueous electrolyte secondary battery including a negative electrode having a negative electrode mixture layer, a positive electrode, and the nonaqueous electrolyte, wherein the negative electrode mixture layer contains a negative electrode active material, and the negative electrode active material contains a material containing a silicon element. ADVANTAGEOUS EFFECTS OF INVENTION According to the present disclosure, in the case where the anode active material contains a material containing a silicon element, the capacity maintenance rate in the charge-discharge cycle of the nonaqueous electrolyte secondary battery can be stably improved. The novel features of the invention are set forth in the appended claims, but the invention, both as to organization and content, together with other objects and features of the invention, will be more fully understood from the following detailed description when considered in connection with the accompanying drawings. Drawings Fig. 1 is a plan view schematically showing a part of the structure of a nonaqueous electrolyte secondary battery in which an embodiment of the present disclosure is cut away. Fig. 2 is a cross-sectional view of the nonaqueous secondary battery shown in fig. 1 taken along line X-X'. Fig. 3 is a diagram for explaining a method of manufacturing the negative electrode for performance evaluation. Fig. 4 is a graph showing a relationship between the number of charge/discharge cycles and the capacity retention rate of the nonaqueous electrolyte secondary battery. Fig. 5 is a diagram showing a relationship between the number of charge/discharge cycles and the capacity retention rate of the nonaqueous electrolyte secondary battery. Detailed Description (Alkoxysilyl Compound and additive for nonaqueous electrolyte solution) The alkoxysilyl compound of the embodiment of the present disclosure has 2 or more silyl groups connected by a chain including an ether group, and the 2 or more silyl groups each have at least 1 selected from the group consisting of an alkoxy group and an oxyalkyl group. The alkoxysilyl compound can be used as an additive for nonaqueous electrolytic solutions. The additive for nonaqueous electrolytic solutions contains an alkoxysilyl compound. The additive for nonaqueous electrolyte is particularly useful for nonaqueous electrolyte secondary batteries using a negative electrode active material containing silicon element. The alkoxysilyl compound may be a dialkoxysilyl compound having 2 silyl groups. In the above-described structure, it is considered that an alkoxy group or an oxyalkyl group of each silyl group forms an X-O-Si bond with the surface of the material containing the silicon element. Here, X represents the surface of a material containing a silicon element, and O bonded to X represents, for example, an O atom (or a residue of an OH group) present on the surface of the material containing a silicon element. The alkoxy group or t