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Novel electrolysis system applicable to lithium titanate battery

An electrolyte and system technology, applied in the field of electrochemical energy storage, can solve problems such as capacity fading, and achieve the effect of inhibiting the phenomenon of flatulence and having wide application prospects.

Inactive Publication Date: 2014-03-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in practical applications, it is found that the lithium titanate battery has obvious flatulence during the cycle and storage process, resulting in serious capacity attenuation.

Method used

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  • Novel electrolysis system applicable to lithium titanate battery
  • Novel electrolysis system applicable to lithium titanate battery

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preparation example Construction

[0075] Preparation method of electrolyte solution system

[0076] The preparation method of electrolytic solution of the present invention may further comprise the steps:

[0077] (a) Under an inert atmosphere, mix an ether solvent and a carbonate solvent to obtain a mixed solvent, and the mass ratio of the ether solvent to the carbonate solvent is (1-x):x, wherein 0<x≤0.9 ; Wherein, described carbonate solvent is the mixed solvent of cyclic carbonate solvent or cyclic carbonate solvent and chain carbonate solvent, the mass of described cyclic carbonate and chain carbonate solvent The ratio is (1-y):y, where 0<y≤0.9;

[0078] (b) adding the electrolyte into the mixed solvent and mixing uniformly to obtain the electrolyte system.

[0079] Here, the inert atmosphere refers to an atmosphere formed of nitrogen, argon or helium.

[0080] Preferably, the cyclic carbonate solvent is one or a mixed solvent of propylene carbonate PC and fluoroethylene carbonate.

[0081] The chain ...

Embodiment 1

[0112] In a glove box filled with high-purity argon, a mixed solvent of tetraethylene glycol dimethyl ether (TEGDME) and propylene carbonate (PC) was prepared, wherein the mass ratio of TEGDME to PC was 2:1, and lithium hexafluorophosphate (LiPF 6 ) is an electrolyte, which is dissolved in a mixed solvent, and an electrolyte solution with a concentration of 1.0mol / L is prepared.

[0113] Put the well-made and uninjected nickel-cobalt lithium manganese oxide-lithium titanate soft pack battery in a high-purity argon glove box with a moisture content of <10ppm, and leave it open for 120 hours at room temperature (20-25°C).

[0114] The electrolyte is injected, the battery capacity is 230mAh, and the injection volume is 3.3g.

[0115] Immediately seal the seal with a sealing machine in the glove box after liquid injection, take out the battery and leave it at room temperature (20-25°C) for 24 hours, and measure the battery volume V0;

[0116] After formation at room temperature (...

Embodiment 2

[0120] In a glove box filled with high-purity argon, prepare a mixed solvent of tetraethylene glycol dimethyl ether (TEGDME) and propylene carbonate (PC), wherein the mass ratio of TEGDME to PC is 2:1, and lithium tetrafluoroborate (LiBF 4 ) is an electrolyte, which is dissolved in a mixed solvent, and an electrolyte solution with a concentration of 1.0mol / L is prepared.

[0121] Put the well-made and uninjected nickel-cobalt lithium manganese oxide-lithium titanate soft pack battery in a high-purity argon glove box with a moisture content of <10ppm, and leave it open for 120 hours at room temperature (20-25°C).

[0122] The electrolyte is injected, the battery capacity is 230mAh, and the injection volume is 3.3g.

[0123] Immediately seal the seal with a sealing machine in the glove box after liquid injection, take out the battery and leave it at room temperature (20-25°C) for 24 hours, and measure the battery volume V0;

[0124] After formation at room temperature (20-25°C...

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Abstract

The invention discloses a novel electrolysis system applicable to a lithium titanate battery. The novel electrolysis system comprises electrolyte and a solvent, wherein the solvent is a mixed solvent of an ether solvent and an carbonic ester solvent comprising cyclic carbonate and the mass ratio of the ether solvent to the carbonic ester solvent is (1-x):x, wherein x is larger than 0 and less than or equal to 0.9. The electrolysis system provided by the invention well accords with an existing lithium titanate battery, has no need of replacing a film, an anode material and a shell, can effectively inhibit the flatulence phenomenon of the lithium titanate battery, and has a wide application prospect in the fields of power batteries and energy storage batteries.

Description

technical field [0001] The invention belongs to the technical field of electrochemical energy storage and relates to a novel electrolyte system suitable for lithium titanate batteries. Background technique [0002] With the rapid development of the global economy, the collection and utilization of traditional fossil energy is difficult to meet the needs of modern economic development, and has brought a series of social and environmental problems, which have become realistic and strategic issues that need to be solved worldwide. Therefore, development and utilization can Renewable energy has far-reaching significance in the establishment of a sustainable energy system, the advancement of energy production and consumption patterns, global economic development and environmental protection. At present, the types of new energy available for human use mainly include solar energy, wind energy, and tidal energy. The common characteristics are that they are widely distributed, enviro...

Claims

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Application Information

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IPC IPC(8): H01M10/0567H01M10/0569
CPCH01M10/0525H01M10/0567H01M10/0569Y02E60/10
Inventor 刘杨王辰云王德宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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