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Nickel-cobalt lithium manganate positive material, preparation method thereof and lithium ion battery

A technology of nickel cobalt lithium manganate and cathode material, which is applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as poor rate performance and low gram capacity, and achieve improved chemical activity, ionic conductivity and electronic conductivity. efficiency, good electron transport performance

Inactive Publication Date: 2018-11-23
CHINA AVIATION LITHIUM BATTERY LUOYANG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a nickel-cobalt lithium manganese oxide positive electrode material, thereby solving the problems of low gram capacity and poor rate performance in the single crystal nickel-cobalt lithium manganese oxide positive electrode material

Method used

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  • Nickel-cobalt lithium manganate positive material, preparation method thereof and lithium ion battery
  • Nickel-cobalt lithium manganate positive material, preparation method thereof and lithium ion battery
  • Nickel-cobalt lithium manganate positive material, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0032] The positive electrode material of nickel-cobalt-lithium-manganese-oxide in this embodiment includes single-crystal lithium-nickel-cobalt-manganese-oxide and a coating layer coated on the surface of single-crystal nickel-cobalt-lithium-manganese-oxide, and the coating layer is composed of lithium vanadium phosphate and conductive carbon black. Single crystal lithium nickel cobalt manganese oxide as LiNi 0.6 co 0.2 mn 0.2 o 2 , the mass of lithium vanadium phosphate is 0.5% of the mass of single crystal nickel cobalt lithium manganese oxide, and the mass of conductive carbon black is 0.15% of the mass of single crystal nickel cobalt lithium manganese oxide.

[0033] The single crystal nickel cobalt lithium manganese oxide of this embodiment is prepared by the following steps:

[0034] 1) Dissolve nickel sulfate, cobalt sulfate, and manganese sulfate in water to prepare a mixed solution, add a concentration of 4mol / L NaOH solution and a concentration of 1mol / L ammonia ...

Embodiment 2

[0039] The positive electrode material of nickel-cobalt-lithium-manganese-oxide in this embodiment includes single-crystal lithium-nickel-cobalt-manganese-oxide and a coating layer coated on the surface of single-crystal nickel-cobalt-lithium-manganese-oxide, and the coating layer is composed of lithium vanadium phosphate and conductive carbon black. Single crystal lithium nickel cobalt manganese oxide as LiNi 0.6 co 0.2 mn 0.2 o 2 , the mass of lithium vanadium phosphate is 1% of the mass of single crystal nickel cobalt lithium manganese oxide, and the mass of conductive carbon black is 0.3% of the mass of single crystal nickel cobalt lithium manganese oxide.

[0040] Single crystal lithium nickel cobalt manganese oxide was prepared by the method in Example 1.

[0041] The preparation method of the nickel-cobalt-lithium-manganate positive electrode material of the present embodiment is to mix 50kg single crystal nickel-cobalt-lithium manganate, 0.5kg lithium vanadium phosp...

Embodiment 3

[0044] The nickel-cobalt-lithium-manganese-oxide positive electrode material in this embodiment includes a single-crystal lithium-nickel-cobalt-manganese-oxide and a cladding layer coated on the surface of the single-crystal nickel-cobalt-lithium-manganese oxide, and the cladding layer is composed of lithium vanadium phosphate and carbon nanotubes. Single crystal lithium nickel cobalt manganese oxide as LiNi 0.6 co 0.2 mn 0.2 o 2 The mass of lithium vanadium phosphate is 0.5% of the mass of single crystal nickel cobalt lithium manganese oxide, and the mass of carbon nanotubes is 0.15% of the mass of single crystal nickel cobalt lithium manganese oxide.

[0045] Single crystal lithium nickel cobalt manganese oxide was prepared by the method in Example 1.

[0046] The preparation method of the nickel-cobalt-lithium-manganese-oxide cathode material of the present embodiment is to mix 50kg of single-crystal nickel-cobalt-lithium-manganese oxide, 0.25kg of vanadium lithium phosp...

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Abstract

The invention relates to a nickel-cobalt lithium manganate positive material, a preparation method thereof and a lithium ion battery. The nickel-cobalt lithium manganate positive material comprises monocrystal nickel-cobalt lithium manganate and a coating layer coated on the surface of the monocrystal nickel-cobalt lithium manganate, and the coating layer consists of lithium vanadium phosphate anda carbon material. Compared with the prior art, the lithium vanadium phosphate and the carbon material are coated on the surface of the monocrystal nickel-cobalt lithium manganate to form a compositematerial, good ion transport performance of lithium vanadium phosphate is combined with preferable electron transport performance of carbon, the electrochemical activity of the monocrystal material is improved, and the gram volume and rate capability of the monocrystal nickel-cobalt lithium manganate positive material are improved greatly.

Description

technical field [0001] The invention relates to the field of preparation of nickel-cobalt lithium manganese oxide cathode material, in particular to a nickel-cobalt lithium manganese oxide cathode material and a preparation method thereof, and a lithium ion battery. Background technique [0002] In recent years, environmentally friendly lithium-ion secondary batteries have been widely used in various portable electronic products and communication tools, and are gradually being developed as power sources for electric vehicles. Among them, the development of new electrode materials, especially cathode materials, is crucial to promote the development of lithium-ion secondary batteries. Nickel-cobalt lithium manganese oxide cathode material (ie, ternary cathode material) has good application prospects in lithium-ion batteries due to its advantages of high energy density and excellent low-temperature performance. However, in practical applications, nickel-cobalt-lithium manganes...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M10/0525
CPCH01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 高文超单旭意乔智李明露
Owner CHINA AVIATION LITHIUM BATTERY LUOYANG
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