Production of electrolyte for secondary lithium batteries

A lithium secondary battery and electrolyte technology, applied in the secondary battery, electrolyte battery manufacturing, non-aqueous electrolyte battery and other directions, can solve the problems of deteriorating the performance of electrode materials, hindering the normal performance of battery performance, etc., to improve structural stability and safety Safety, high safety, effect of improving effect

Inactive Publication Date: 2007-04-04
INST OF PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods have nothing to do with improving the performance of the positive electrode material of the battery, and some may even degrade the performance of the electrode material and hinder the normal performance of the battery.

Method used

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  • Production of electrolyte for secondary lithium batteries

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 01

[0039] According to the first method, adding nano-Al 2 o 3 . dry Al with a particle size of 100 nm 2 o 3 Powder was added to 1 mol / L LiPF 6 In the ethylene carbonate (EC) / dimethyl carbonate (DMC) (the volume ratio of the two is 1:1). al 2 o 3 The weight accounts for 8% of the weight of the electrolyte. At room temperature (25° C.), the mixture was mechanically stirred at 700 rpm. After stirring for 24 hours, the solid and liquid parts of the mixture were separated with a centrifuge (rotating at 1600 rpm) (see Table 1 for details). Take the liquid part as the new electrolyte.

[0040] The conductive agent carbon black (10w%), the NMP solution of the binder polyvinylidene fluoride (PVdF, 5w%) and the commercial positive electrode active material LiCoO 2 (85w%) were mixed uniformly to prepare a slurry. The relevant parameters of the cathode active materials are listed in Table 2. The electrode is coated according to the conventional method, and can be used as a positi...

Embodiment 02-04

[0044] A series of new electrolytes were prepared by changing the type, average particle size, stirring and separation speed and temperature of the nano-additive materials used in Example 01 (see Table 1 for details).

[0045] The type and average particle size of the commercially available positive electrode active material were changed (see Table 2 for details), and the positive electrode sheet was prepared according to the method in Example 01. The relevant parameters of the cathode active materials are listed in Table 2.

[0046] The conductive agent carbon black (10w%), the acetone solution of the binder polyacrylonitrile (PAN, 5w%) and the commercial negative electrode active material (85w%) were uniformly mixed to prepare a slurry. The relevant parameters of the negative active materials are listed in Table 2. The electrode is coated according to a conventional method, and can be used as a negative electrode sheet after drying (removing the solvent) and rolling treatme...

Embodiment 05

[0050] According to the first method, adding nano-Li 3 PO 4 . Dry Li with a particle size of 2000 nm 3 PO 4 Powder was added to 1 mol / L LiPF 6 In the ethylene carbonate (EC) / dimethyl carbonate (DMC) (the volume ratio of the two is 1:1). Li 3 PO 4 The weight accounts for 15% of the weight of the electrolyte. The mixture was mechanically stirred at 80° C. at 600 rpm. After stirring for 20 hours, the solid and liquid parts of the mixture were separated using a centrifuge (rotating at 1600 rpm) (see Table 1 for details). Take the liquid part as the new electrolyte.

[0051] According to the conventional method, commercial LiCoO 2 Prepare the positive electrode sheet for the active material (see Table 2 for details), use metal lithium as the negative electrode (the negative electrode is excessive), and use the PP / PE porous film as the separator, and assemble it into a lithium secondary battery in a glove box filled with argon. The new electrolytic solution prepared above...

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Abstract

The invention is concerned with the electrolyte preparation method for reuse of the lithium battery, it is: adds nanomaterials into the existing electrolyte or the liquor that can improve the using capability of the reused lithium battery anode material and the stability of the circulation, dispenses with the uperficial modification / cover processing craft for the anode material. The invention can charge to higher voltage, get higher circulation capability, and improve the security of the batter.

Description

technical field [0001] The invention belongs to the technical field of high-energy batteries, and in particular relates to a method for preparing electrolytes for lithium secondary batteries (including lithium ion batteries and secondary lithium batteries, hereinafter collectively referred to as lithium secondary batteries). Background technique [0002] At present, the positive electrode active materials used in lithium-ion batteries mainly include LiCoO with a rock-salt structure. 2 and LiNiO 2 , LiMn with spinel structure 2 o 4 and LiFePO with olivine structure 4 . Under the condition that the battery is charged to a potential of 4.2V against lithium metal, LiCoO 2 The actual capacity can reach about 150 mAh / g, spinel LiMn 2 o 4 The actual capacity can be about 120 mAh / g, LiFePO with olivine structure 4 The capacity can reach about 150 mAh / g. Generally speaking, increasing the charging voltage can further increase the available capacity of the material, but this ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M10/38H01M10/40H01M10/0567H01M10/058
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 王兆翔刘建永刘道坦柳娜白莹陈立泉
Owner INST OF PHYSICS - CHINESE ACAD OF SCI
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