Non-aqueous electrolyte and lithium secondary battery including the same

A lithium secondary battery and electrolyte technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as severe heat, fire and burning, and a large amount of gas ejection

Active Publication Date: 2012-07-11
IND TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the temperature of the battery rises to 180°C, the decomposition reaction between the electrolyte and the positive electrode material

Method used

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  • Non-aqueous electrolyte and lithium secondary battery including the same
  • Non-aqueous electrolyte and lithium secondary battery including the same
  • Non-aqueous electrolyte and lithium secondary battery including the same

Examples

Experimental program
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Effect test

Embodiment 1

[0083] First, 3% oligomer of phenylmethane maleimide (compound (A)) was dissolved in EC / PC to form a mixed solution. Next, 2,4-dimethyl-2-imidazoline (2,4-bimethyl-2-imidazoline) (compound (B)) was added in batches to the mixed solution, and the heating polymerization reaction was carried out at 130° C. for 8 hours, wherein The molar ratio of 3% benzyl maleimide oligomer to 2,4-dimethyl-2-imidazoline is 2:1. So far, the metastable nitrogen-containing polymer of Example 1 was obtained.

[0084] The metastable nitrogen-containing polymer of embodiment 1 is a polymer with a narrow molecular weight distribution, its GPC gel permeation chromatography peak time is 20.5 minutes, and the molecular weight distribution index (Polydispersity index, PDI) 1.2, such as figure 1 shown. In addition, the metastable nitrogen-containing polymer in Example 1 was induced again at a temperature of 186° C., so that the metastable nitrogen-containing polymer was completely converted into a macromo...

Embodiment 2

[0086] First, 5% 4,4'-diphenylmethane bismaleimide (compound (A)) was dissolved in GBL to form a mixed solution. Next, 2,4-dimethyl-2-imidazoline (compound (B)) was added in batches to the mixed solution, and thermal polymerization was carried out at 100°C for 15 hours, wherein 5% of 4,4'-diphenylmethane bis The molar ratio of maleimide to 2,4-dimethyl-2-imidazoline is 2:1. So far, the metastable nitrogen-containing polymer of Example 2 was obtained.

[0087] The metastable nitrogen-containing polymer of embodiment 2 is a kind of polymer of narrow molecular weight distribution, and its GPC peak time is 22.4 minutes, molecular weight distribution index (PDI) 1.2, as figure 2 shown. In addition, the metastable nitrogen-containing polymer of Example 2 was induced again at a temperature of 180° C., so that the metastable nitrogen-containing polymer was completely converted into a macromolecular polymer.

Embodiment 3

[0089] First, 3% oligomer of benzyl maleimide (compound (A)) was dissolved in NMP to form a mixed solution. Next, 2,4-dimethyl-2-imidazoline (compound (B)) was added in batches to the mixed solution, and thermal polymerization was carried out at 150°C for 3 hours, in which 3% of benzenemethane maleimide oligo The molar ratio of polymer to 2,4-dimethyl-2-imidazoline was 4:1. So far, the metastable nitrogen-containing polymer of Example 3 was obtained.

[0090] The metastable nitrogen-containing polymer of embodiment 3 is a kind of polymer of narrow molecular weight distribution, and its GPC peak time is 22.6 minutes, molecular weight distribution index (PDI) 1.2, as image 3 shown. In addition, the metastable nitrogen-containing polymer in Example 3 was induced again at a temperature of 186° C., so that the metastable nitrogen-containing polymer was completely converted into a macromolecular polymer.

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Abstract

A non-aqueous electrolyte including a lithium salt, an organic solvent, and an electrolyte additive is provided. The electrolyte additive is a meta-stable state nitrogen-containing polymer formed by reacting Compound (A) and Compound (B). Compound (A) is a monomer having a reactive terminal functional group. Compound (B) is a heterocyclic amino aromatic derivative as an initiator. A molar ratio of Compound (A) to Compound (B) is from 10:1 to 1:10. A lithium secondary battery containing the non-aqueous electrolyte is further provided. The non-aqueous electrolyte of this disclosure has a higher decomposition voltage than a conventional non-aqueous electrolyte, such that the safety of the battery during overcharge or at high temperature caused by short-circuit current is improved.

Description

technical field [0001] The invention relates to a non-aqueous electrolytic solution and a lithium secondary battery containing the non-aqueous electrolytic solution, which can improve the safety of the battery when over-discharge or short circuit generates high temperature. Background technique [0002] Modern portable electronic devices rely almost entirely on rechargeable lithium secondary batteries as their power sources. This need drives various continual research and development efforts to increase their capacitance capability, power supply capability, service life, safety features, and cost reduction. [0003] The safety problems of lithium secondary batteries mainly come from the rise of the internal temperature of the battery, including improper heating of the battery, overcharging, short circuit caused by contact of positive and negative materials, etc. When the internal temperature of the battery continues to rise and cannot be suppressed, the separator used to se...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0525
CPCY02E60/122Y02E60/10
Inventor 蔡丽端林月微方家振郑丞良潘金平王宗雄
Owner IND TECH RES INST
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