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Lithium-ion battery electrolyte taking LiBF2SO4 as basic lithium salt

A lithium-ion battery and electrolyte technology, which is applied in the direction of secondary batteries, circuits, electrical components, etc., can solve the problems of reducing battery cycle performance, limiting battery high temperature performance, and electrode material damage, so as to improve rate performance and cycle performance. Widening the range of options and construction methods, and improving high-temperature performance

Inactive Publication Date: 2014-01-22
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of electrolyte has high electrical conductivity and anti-oxidation potential, but due to LiPF 6 It is easy to react with a small amount of water in the electrolyte to generate HF, which will damage the electrode material and reduce the cycle performance of the battery
In addition, LiPF 6 The thermal decomposition temperature is low, which limits the high temperature performance of the battery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Preparation of electrolyte:

[0015] At room temperature, in a glove box filled with argon, mix ethylene carbonate (EC) and dimethyl carbonate (DMC) in a volume ratio of 1:2, and add the corresponding mass of LiBF 2 SO 4 , mixed evenly, and prepared as LiBF with a substance concentration of 1.0 mol / L 2 SO 4 electrolyte;

[0016] (2) Preparation of positive pole piece:

[0017] First LiFePO 4 , acetylene black and polyvinylidene fluoride (PVDF) are fully stirred and mixed uniformly at a mass ratio of 84:8:8, and then the obtained mixture is uniformly mixed with N-methylpyrrolidone (NMP) at a mass ratio of 1.5:1 , to prepare positive electrode slurry. Use a coating machine to evenly coat the obtained positive electrode slurry on the aluminum foil current collector, dry at 120°C, cut and calender to obtain the positive electrode sheet;

[0018] (3) Battery assembly:

[0019] The above-mentioned positive pole piece, metal lithium sheet and polypropylene diaphrag...

Embodiment 2

[0021] Prepare 2032 type LiFePO in the same manner as in Example 1 4 / Li test half-cell. The aprotic organic solvent in the electrolyte is a mixture of propylene carbonate (PC) and DMC at a volume ratio of 1:1, and the electrolyte lithium salt is LiBF 2 SO 4 (The concentration of the substance is 0.7 mol / L).

Embodiment 3

[0023] Prepare 2032 type LiFePO in the same manner as in Example 1 4 / Li test half-cell. The aprotic organic solvent in the electrolyte is a mixture of EC and DMC at a volume ratio of 3:7, and the electrolyte lithium salt is LiBF 2 SO 4 (The concentration of the substance is 1.0 mol / L).

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Abstract

The invention discloses a lithium-ion battery electrolyte taking LiBF2SO4 as basic lithium salt. The electrolyte comprises the following components: electrolyte lithium salt and an aprotic solvent, wherein the electrolyte lithium salt can be unitary LiBF2SO4 and also can be a mixture of LiBF2SO4 and other common lithium salts; the aprotic solvent is one or a mixture of some of common carbonic ester, sulphite, sulfone compounds and the like. Through the lithium-ion battery electrolyte, disclosed by the invention, the compatibility between the electrolyte and the electrode materials can be improved; meanwhile, the rate performance, the high-temperature performance and the cycle performance of the lithium-ion battery can be effectively improved.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery electrolyte, and specifically discloses a LiBF 2 SO 4 A new lithium-ion battery electrolyte based on lithium salt. Background technique [0002] Lithium-ion batteries have the advantages of high working voltage, high specific energy, good safety performance, no memory effect, small self-discharge, long cycle life, and environmental friendliness. They have been widely used in portable mobile phones, notebook computers and electric vehicles. The electrolyte is one of the important components of the battery. It plays the role of transporting ions between the positive and negative electrodes of the battery, and has an important impact on the capacity, cycle performance and safety performance of the battery. At present, the electrolyte solution used in the market is mostly a mixture of carbonates, and the electrolyte lithium salt is mainly lithium hexafluorophosphate (LiPF 6 )(Li Z D, Zh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/0568
CPCH01M10/0525H01M10/0568H01M10/0569Y02E60/10
Inventor 李世友张宏明崔孝玲赵伟李永立李晓鹏刘金良净洁李玲霞薛宇宙
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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