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Non-aqueous electrolyte secondary battery

A non-aqueous electrolyte, secondary battery technology, used in non-aqueous electrolyte storage batteries, secondary batteries, electrolytes, etc.

Pending Publication Date: 2021-11-05
PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the high capacity of lithium-ion batteries is gradually reaching its limit

Method used

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  • Non-aqueous electrolyte secondary battery
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0144] 1,2-dimethoxyethane (DME) and 1,1,2,2-tetrafluoroethyl 2,2,2-trifluoroethyl ether (CHF 2 (CF 2 OCH 2 ) CF 3 : Fluorination rate 70%, FE-1) were mixed so that the volume ratio V1 / V2 of each volume V1 and volume V2 becomes 1 / 2, and it was used as a solvent. Lithium bissulfonylimide (LiFSI) was dissolved in the obtained solvent so as to have a concentration of 1 mol / L to prepare a nonaqueous electrolyte. Based on the above (4) and (5), evaluation of the produced lithium metal secondary battery was performed.

Embodiment 2

[0146] Except having used 1,2-diethoxyethane (DEE) instead of DME, the nonaqueous electrolyte was prepared similarly to Example 1, and the evaluation of the produced lithium metal secondary battery was performed.

Embodiment 3

[0148] Use 1,1,2,2-tetrafluoroethyl 2,2,3,3-tetrafluoropropyl ether (CHF 2 (CF 2 OCH 2 )C 2 HF 4 : Fluorination rate 67%, FE-2) instead of FE-1, it carried out similarly to Example 1, and prepared the nonaqueous electrolyte, and evaluated the produced lithium metal secondary battery.

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Abstract

A non-aqueous electrolyte secondary battery comprises a positive electrode, a negative electrode and a non-aqueous electrolyte having lithium ion conductivity, wherein a solvent in the non-aqueous electrolyte comprises a first ether compound represented by general formula (1): R1-(OCH2CH2)n-OR2 (wherein R1 and R2 independently represent an alkyl group having 1 to 5 carbon atoms; and n represents 1 to 3) and a second ether compound represented by general formula (2): Ca1Hb1Fc1Od1(CF2OCH2)Ca2Hb2Fc2Od2 (wherein a1 >=1, a2 >=0, b1 <=2a1, b2 <= 2a2, c1 = (2a1+1)-b1, c2 = (2a2+1)-b2, d1 >= 0, and d2 >= 0) and having a fluorination rate of 60% or more. The total amount of the first ether compound and the second ether compound is 80% by volume or more relative to the whole amount of the solvent.

Description

technical field [0001] The present invention relates to a nonaqueous electrolyte secondary battery using lithium metal as a negative electrode active material, and in more detail, to improvement of a nonaqueous electrolyte. Background technique [0002] Non-aqueous electrolyte secondary batteries are used, for example, for ICT (Information and Communication Technology) such as personal computers and smartphones, for vehicles, and for power storage. In such applications, a further increase in capacity is required for non-aqueous electrolyte secondary batteries. Lithium-ion batteries are known as high-capacity non-aqueous electrolyte secondary batteries. Higher capacity of lithium ion batteries can be achieved by using, for example, an alloy active material such as graphite and a silicon compound in combination as a negative electrode active material. [0003] Regarding lithium ion batteries, from the viewpoint of improving battery characteristics such as cycle characteristi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/052H01M10/0568H01M10/0569
CPCH01M10/052H01M10/0568H01M10/0569Y02E60/10H01M4/382H01M2300/0034H01M2300/0037H01M10/0525
Inventor 蚊野聪冈崎伦久宫前亮平
Owner PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD