Electrolytic solution of lithium ion secondary battery and battery containing the electrolytic solution

A secondary battery and electrolyte technology, applied in the electrolyte field, can solve the problems of poor safety performance and low rate discharge performance, and achieve the effects of enhancing safety and improving high temperature cycle stability

Active Publication Date: 2008-06-18
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the defects of low rate discharge performance and poor safety performance of lithium-ion secondary batteries containing the existing electrolyte, to provide a kind of electrolyte that can improve the rate discharge performance and safety performance and contain the electrolyte lithium-ion secondary battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] The preparation method of the electrolyte solution provided by the present invention is to mix the lithium salt A, lithium salt B and lithium salt C contained in the electrolyte in a dry environment, add the mixed lithium salt to a non-aqueous solvent, and then mix the lithium salt at 50- Heat and stir at 80°C to fully dissolve the mixed lithium salt to prepare an electrolyte solution.

[0020] Lithium ion secondary battery provided according to the present invention comprises, battery case, electrode group and electrolytic solution, electrode group and electrolytic solution are sealed in the battery case, electrode group comprises sequentially wound or stacked positive pole, separator and negative pole, wherein , the electrolyte is the electrolyte provided by the present invention.

[0021] The lithium ion secondary battery provided by the present invention includes a battery case, an electrode group and an electrolyte, the electrode group and the electrolyte are seale...

Embodiment 1

[0037] (1) Preparation of electrolyte

[0038] In an argon-filled glove box (H 2 O2 4 and LiCF 3 SO 3 , and then heated and stirred at 50°C to dissolve the mixed lithium salts to obtain an electrolyte solution, wherein, in the obtained electrolyte solution, the concentration of LiBOB was 0.5 mol / liter, LiBF 4 At a concentration of 0.5 mol / L, LiCF 3 SO 3 The concentration is 0.1 mol / L.

[0039] (2) Preparation of positive electrode

[0040] LiFePO 4 , carbon black and polyvinylidene fluoride (PVDF) are fully stirred and mixed uniformly at a weight ratio of 94:3:3, and the obtained mixture is uniformly mixed with N-methylpyrrolidone (NMP) at a weight ratio of 1.5:1 to prepare Positive slurry. Using a coating machine, the obtained positive electrode slurry is evenly coated on the aluminum foil current collector, dried at 130 ° C, cut and rolled to obtain the positive electrode sheet, and the size of the positive electrode sheet is 500 mm (length) × 40 mm ( Width) × 150 m...

Embodiment 2

[0050] Prepare electrolyte and battery in the same manner as in Example 1, except that the electrolyte uses LiBOB, LiClO 4 and LiCF 3 SO 3 The mixed lithium salt, in the electrolyte, the concentration of LiBOB is 0.05 mol / L, LiClO 4 At a concentration of 0.5 mol / L, LiCF 3 SO 3 The concentration is 0.5 mol / L.

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PUM

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Abstract

The invention provides an electrolyte of a li-ion secondary battery and a li-ion secondary battery which is provided with the electrolyte. The electrolyte comprises non-aqueous solvent and electrolyte which is mixed lithium salt; wherein, the mixed lithium salt comprises lithium salt A, lithium salt B and lithium salt C; the lithium salt A is LiBOB; the lithium salt B is LiCF3SO3 and/or Li (CF3SO2)2N; the lithium salt C is one or more than one chosen out of LiPF6, LiBF4, LiCIO4, LiAsF6 and lithium halide. By adopting the electrolyte and the battery provided by the invention, the high-temperature storage performance, the high-temperature circulation performance, discharging performance in different ratios and safety performance are all obviously improved.

Description

technical field [0001] The invention relates to an electrolytic solution of a lithium ion secondary battery and a battery containing the electrolytic solution. Background technique [0002] The basic composition of a lithium-ion secondary battery includes a battery case, an electrode group and an electrolyte, the electrode group and the electrolyte are sealed in the battery case, the electrode group includes a positive electrode, a separator and a negative electrode wound or stacked in sequence, and the positive electrode contains Lithium metal composite oxide is used as the positive electrode active material, graphite, silicon and other materials are used as the negative electrode active material in the negative electrode, and the separator is used to separate the positive and negative electrodes. Among them, the electrolyte is an important part of the battery and has a great influence on the performance of the battery. [0003] At present, whether it is a small-capacity p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/02H01M10/40H01M10/04H01B1/20H01M10/056H01M10/0568
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 万彩敏潘福中沈晞
Owner SHANGHAI BYD
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