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Lithium ion secondary battery positive pole piece, preparation method thereof and lithium ion secondary battery

A technology for positive pole pieces and secondary batteries, which is applied in secondary batteries, battery electrodes, circuits, etc., can solve problems such as transition metal catalyzed electrolyte oxidation and decomposition, and achieve simple and easy methods, improve cycle performance, and solve catalytic electrolysis problems. The effect of liquid oxidation decomposition

Active Publication Date: 2014-07-23
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the first aspect of the embodiment of the present invention provides a lithium-ion secondary battery positive pole piece, which overcomes the problem of oxidative decomposition of the transition metal catalyzed electrolyte in the positive electrode active material of the lithium-ion secondary battery in the prior art , thereby improving the cycle performance of lithium-ion secondary batteries at high voltages of 4.5V and above

Method used

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Examples

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preparation example Construction

[0041] In a second aspect, an embodiment of the present invention provides a method for preparing a positive pole piece of a lithium-ion secondary battery, comprising the following steps:

[0042] Take the positive electrode active material, conductive agent, binder and solvent, mix and stir to prepare positive electrode slurry, the positive electrode active material contains transition metal;

[0043] The positive electrode slurry is coated on the current collector, and the subsequent steps also include drying, rolling and placing it in a gas atmosphere. The gas is an alkyne compound with a carbon number of 2 to 10 and its derivatives, carbon One or more of mercaptans with 1 to 10 atoms, sulfides, phosphine, and alkyl-substituted phosphides with 1 to 10 carbon atoms, the drying, rolling and placing in a gas atmosphere The order of laying aside is not limited, and the lithium ion secondary positive electrode sheet is obtained.

[0044] Wherein, the positive electrode active m...

Embodiment 1

[0057] A preparation method for a positive electrode sheet of a lithium ion secondary battery, comprising the following steps:

[0058] 800 grams of positive electrode active material LiNi 0.5 mn 1.5 o 4 100 grams of conductive agent acetylene black and 100 grams of binder polyvinylidene fluoride (PVDF), were added to 800 grams of N-methylpyrrolidone solution (NMP solution), and stirred in a vacuum mixer for 2 hours to prepare positive electrode slurry;

[0059] The positive electrode slurry is uniformly coated on aluminum foil, dried at 110°C, rolled, and then placed in an atmosphere containing dry acetylene gas, left at room temperature for 2 hours and then taken out to obtain a lithium ion secondary battery positive electrode piece.

[0060] The surfaces of the transition metals Ni and Mn in the positive electrode sheet of the lithium ion secondary battery are covered with acetylene gas molecules.

[0061] Preparation of Negative Electrode for Lithium-ion Secondary Batt...

Embodiment 2

[0068] In Example 2, the same method as Example 1 was used to prepare the positive pole piece of lithium ion secondary battery, the difference was that after rolling, it was placed in an atmosphere containing dry acetylene gas, and it was left at room temperature for 1 hour before being taken out to prepare Obtain the positive pole piece of the lithium ion secondary battery.

[0069] A lithium-ion secondary battery was prepared in the same manner as in Example 1, except that the positive pole piece of the lithium-ion secondary battery prepared in Example 2 was used to assemble the battery, and the lithium-ion secondary battery was obtained after sealing.

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Abstract

The invention provides a lithium ion secondary battery positive pole piece which comprises a current collector, a positive active material, a conductive agent and a binder, the positive active material contains a transition metal, and the transition metal surface is boned, by chemical bonds, with one or more substance selected from an acetylenic compound with 2-10 carbon atoms and a derivative thereof, mercaptan, sulfide and phosphine with 1-10 carbon atoms and an alkyl substituted phosphide with 1-10 carbon atoms. The lithium ion secondary battery positive pole piece in the embodiment overcomes the problem that an electrolyte is catalyzed for oxygenolysis by the transition metal in the positive active material of a lithium ion secondary battery in the prior art, so that the cycle performance of the lithium ion secondary battery under a high voltage of 4.5V and above can be improved. The embodiment of the invention also provides a preparation method of the lithium ion secondary battery positive pole piece, and a lithium ion secondary battery comprising the lithium ion secondary battery positive pole piece.

Description

technical field [0001] The invention relates to the field of lithium-ion batteries, in particular to a lithium-ion secondary battery positive pole piece, a preparation method thereof, and a lithium-ion secondary battery. Background technique [0002] Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, separators, casings and electrolytes. + A rechargeable and dischargeable high-energy battery that embeds and extracts positive and negative electrode materials for energy exchange has gradually entered people's sight because of its high energy density, good cycle performance, and no memory effect, and has become a popular technology in recent years. focus of researchers' attention. [0003] At this stage, when the operating voltage reaches 4.5V, the electrolyte system will undergo oxidative decomposition, so it is difficult for most lithium-ion secondary batteries to be used stably at high voltages of 4.5V and above. One of the reasons for t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/131H01M4/1391H01M10/0525
CPCH01M4/131H01M4/362H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 王圣
Owner HUAWEI TECH CO LTD
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