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High-security double-coated Ni-Co lithium manganite anode material and preparation method thereof

A technology of nickel-cobalt lithium manganate and double-layer coating is applied in the field of high-safety double-layer-coated nickel-cobalt lithium manganate cathode material and its preparation field, which can solve the problem of increasing interface resistance, reducing battery performance, and reducing lithium ion Conductivity and other issues to avoid leakage and improve battery stability

Inactive Publication Date: 2017-11-24
GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic coating can improve the stability of ternary cathode materials, but because inorganic substances reduce the conductivity of lithium ions and increase the interfacial resistance, thereby reducing battery performance

Method used

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  • High-security double-coated Ni-Co lithium manganite anode material and preparation method thereof
  • High-security double-coated Ni-Co lithium manganite anode material and preparation method thereof
  • High-security double-coated Ni-Co lithium manganite anode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] V 2 o 5 Coated NCM, butylthiophene (3BT) and sodium p-toluenesulfonate were stirred in absolute ethanol and mixed evenly, FeCl 3 As an oxidant, it was continuously dropped into the mixture, and the mixture was continuously stirred for 24 hours in an ice-water bath to carry out polymerization reaction. Afterwards, the reaction product was filtered, washed and vacuum-dried at 80° C. for 12 h to obtain P3BT-VO-NCM.

[0027] Mix P3BT-VO-NCM, acetylene black, KS-6, and PVDF evenly according to the mass ratio of 9.2︰0.3︰0.2︰0.3, add an appropriate amount of NMP, and stir to make a uniform slurry; spread the slurry evenly Put it on the aluminum foil, dry it in a blast drying oven, and then put it in a vacuum drying oven at 120°C for 12 hours in a vacuum; after natural cooling, use a punching machine to punch out a disc with a diameter of 16mm, and put the disc on the tablet press. After being compacted with a pressure of 10MPa, the positive electrode sheet is obtained. The...

Embodiment 2

[0030] The material and battery preparation process are similar to those in Example 1, and the conductive polymer monomer is pyrrole.

[0031] Carry out constant current charge and discharge test at room temperature. The test voltage range of rate performance is 2.6V ~ 4.3V. Cycle 5 times at 0.1C. The voltage range of the cycle performance test is also 2.6V ~ 4.3V, 100 cycles at 0.5C. The first discharge capacity of electrochemical test at 0.5C is 170.2mAh / g.

Embodiment 3

[0033]The material and battery preparation process are similar to those in Example 1, and the conductive polymer monomer is 3-hexylthiophene.

[0034] Carry out constant current charge and discharge test at room temperature. The test voltage range of rate performance is 2.6V ~ 4.3V. Cycle 5 times at 0.1C. The voltage range of the cycle performance test is also 2.6V ~ 4.3V, 100 cycles at 0.5C. The first discharge capacity of electrochemical test at 0.5C is 170.1 mAh / g.

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Abstract

The invention discloses a high-security double-coated Ni-Co lithium manganite anode material and a preparation method thereof. In the anode material, a core is made of Ni-Co lithium manganite; and the anode material also comprises an inner layer coating material (V2O5) and an outer layer coating material (a conductive high-molecular polymer). The two coating layers with uniform thickness can be formed on the surfaces of particulate matters of the anode active material, the inner layer is made of V2O5, and the outer layer is made of the conductive high-molecular polymer. Relative to other inorganic matters, V2O5 has higher ionic conductivity and reacts with LiOH and Li2CO3 on the surface of an NCM (Ni-Co-Mn) material in a preparation process to form LiVO3 at the same time, so that the reaction of the anode material and HF (hydrogen fluoride) in electrolyte is avoided. Through adoption of the conductive high-molecular polymer of the outer layer, on one hand, the characteristic of electronic conductivity of the anode material can be improved, and on the other hand, the loss of a V element in a long-term circulation process of a battery can be avoided; and therefore, the stability of the battery is improved.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a high-safety double-layer coated nickel-cobalt lithium manganese oxide positive electrode material and a preparation method thereof. Background technique [0002] Due to the obvious advantages of high specific energy and high specific power, lithium-ion batteries are considered to be the most potential future power battery system, but they also have certain safety problems, especially the explosion and fire of lithium-ion batteries. According to reports, to a large extent, it restricts its use in electric vehicle systems. [0003] As the energy density of electric vehicle batteries continues to increase, ternary nickel-cobalt-manganese materials have been widely used. In order to increase the energy density, the nickel content in the material increases, which reduces the thermal stability of the material and deteriorates the safety performance of the battery. Thermal ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/624H01M4/628H01M10/0525Y02E60/10
Inventor 刘伟星王强胡立平覃关键李福桥
Owner GUANGDONG TEAMGIANT NEW ENERGY TECH CORP
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