Sodium ion doped high-nickel ternary lithium battery positive electrode material and preparation method

A ternary lithium battery and positive electrode material technology, applied in the field of lithium ion materials, can solve the problems of lithium ion capacity reduction, achieve the effect of improving cycle stability, improving stability, and facilitating diffusion

Inactive Publication Date: 2018-07-27
CHENDU NEW KELI CHEM SCI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] It is difficult to effectively control Ni during the sintering process 2+ From the layered structure, the embedded lithium layer is released, causing structural changes in the desorption process to cause the defect of lithium ion capacity reduction. The present invention proposes a high-nickel ternary lithium battery positive electrode material and preparation method doped with sodium ions, which inhibit Ni 2+ Migrate to the lithium layer during the sintering process, reduce the mixed discharge of nickel and lithium in the high-nickel ternary cathode material, thereby improving the stability of the layered structure and improving the cycle stability of the lithium-ion battery

Method used

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  • Sodium ion doped high-nickel ternary lithium battery positive electrode material and preparation method

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Embodiment 1

[0030] (1) Nickel chloride, cobalt chloride, manganese chloride, lithium oxide and sodium peroxide are used as raw materials, and 0.8 parts of nickel chloride, 0.1 part of cobalt chloride, 0.1 part of manganese chloride, and 0.485 parts are weighed according to the molar ratio Lithium oxide and 0.015 parts of sodium peroxide;

[0031] (2) Add the nickel salt, cobalt salt, and manganese salt into the phosphoric acid solution with an appropriate pH value of 3, add an appropriate amount of sodium hydroxide to adjust the pH value to 10, set the stirring speed to 800 rpm, and obtain NCM coprecipitation under high-speed stirring The dispersion liquid is then filtered, and the treatment conditions are such that the drying temperature is 50°C and the ambient pressure is 300 Pa, and the low-temperature drying is obtained to obtain the 811-type NCM precursor;

[0032] (3) The 811-type NCM precursor was added to a ball mill for grinding, and the temperature was kept at 60°C during the gr...

Embodiment 2

[0035] (1) Using nickel nitrate, cobalt nitrate, manganese nitrate, lithium oxide and sodium peroxide as raw materials, weigh 0.8 part of nickel salt, 0.1 part of cobalt salt, 0.1 part of manganese salt, 0.485 part of lithium oxide and 0.015 part of peroxide sodium oxide;

[0036] (2) Add an appropriate amount of nickel salt, cobalt salt, and manganese salt to hydrochloric acid solution with a pH value of 3, add an appropriate amount of alkaline solution sodium carbonate to adjust the pH value to 11, set the stirring speed to 600 rpm, and obtain NCM under high-speed stirring The co-precipitation dispersion is then filtered, and the treatment conditions are such that the drying temperature is 55°C and the ambient pressure is 30Pa and dried at a low temperature to obtain the 811-type NCM precursor;

[0037] (3) The 811-type NCM precursor was added to a ball mill for grinding, and the temperature was kept at 80°C during the grinding process to obtain a precursor powder with a par...

Embodiment 3

[0040] (1) Using nickel bromide, cobalt bromide, manganese bromide, lithium oxide and sodium peroxide as raw materials, weigh 0.8 parts of nickel salt, 0.1 part of cobalt salt, 0.1 part of manganese salt, 0.485 parts of lithium oxide and 0.015 part sodium peroxide;

[0041] (2) Add an appropriate amount of nickel salt, cobalt salt, and manganese salt into the mixed solution of sulfuric acid, hydrochloric acid, and nitric acid with an appropriate pH value of 3, respectively, add an appropriate amount of potassium hydroxide to adjust the pH value to 12, set the stirring speed to 300 rpm, and stir at a high speed The NCM co-precipitation dispersion was obtained under the following conditions, and then filtered, and the treatment conditions were that the drying temperature was 55 ° C, and the ambient pressure was 180 Pa. Drying at low temperature to obtain the 811-type NCM precursor;

[0042] (3) The 811-type NCM precursor was added to a ball mill for grinding, and the temperature...

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Abstract

The invention provides a sodium ion doped high-nickel ternary lithium battery positive electrode material and a preparation method. The preparation method comprises the following steps: preparing an 811-type NCM (Nickel Cobalt Manganese) ternary positive electrode precursor through a co-precipitation method; after drying and grinding the precursor, mixing the ground precursor with powdery sodium peroxide and lithium oxide; pre-firing and sintering under an oxygen-rich environment to prepare the sodium ion doped high-nickel ternary lithium battery positive electrode material. According to the method provided by the invention, the defects that Ni<2+> is difficulty effectively controlled to be released from and embedded into a lamellar structure in a sintering process so that a structure is changed in a desorption process and the capacity of lithium ions is reduced are effectively overcome; sodium peroxide is changed into a molten state in a pre-firing process and permeates into the precursor, so that the Ni<2+> is oxidized into Ni<3+>; meanwhile, a lithium layer is occupied and an interlayer structure is expanded; the Ni<2+> is prevented from being migrated into the lithium layer ina sintering process; technical effects that nickel and lithium mixed arrangement of the high-nickel NCM positive electrode material is reduced, the migration rate of lithium ions is improved and the circulating performance of the battery is improved are realized.

Description

technical field [0001] The invention relates to the technical field of lithium ion materials, in particular to a high-nickel ternary lithium battery positive electrode material doped with sodium ions and a preparation method thereof. Background technique [0002] Compared with traditional storage batteries, lithium-ion batteries not only have higher energy, stronger discharge capacity, and longer cycle life, but also have an energy storage efficiency of more than 90%. The above characteristics determine the use of lithium-ion batteries in electric vehicles, storage power, etc. With great development prospects, lithium-ion batteries have been rising all the way with the development of electric vehicles. At present, they have become the main source of power for electric vehicles. As people's requirements for lithium-ion batteries are getting higher and higher, it is more and more important to develop lithium batteries with high capacity and high energy density. [0003] Nicke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525
CPCH01M4/366H01M4/505H01M4/525Y02E60/10
Inventor 陈庆廖健淞
Owner CHENDU NEW KELI CHEM SCI CO LTD
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