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Lithium-oxygen codoping method of ternary lithium ion anode material

A cathode material and lithium ion technology, applied in the field of new energy materials, can solve the problems of poor rate performance and cycle stability of large-particle spherical lithium ion ternary cathode materials, and achieve simple and easy control of doping amount, low cost, and technological process. Simple and easy effects

Inactive Publication Date: 2018-06-22
QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD +1
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  • Application Information

AI Technical Summary

Problems solved by technology

It is suitable for large-scale production in factories to solve the problem of poor rate performance and cycle stability of large-particle spherical lithium-ion ternary cathode materials proposed in the above-mentioned background technology

Method used

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Embodiment 1

[0023] In an embodiment of the present invention: a method for co-doping lithium-site and oxygen-site of a lithium-ion ternary positive electrode material is provided, comprising the following steps:

[0024] Step 1: Mix the lithium-ion ternary positive electrode material with a certain amount of metal salt and fluoride salt evenly; among them, the lithium-ion ternary positive electrode material is NCM, NCA positive electrode material system; the metal salt is sodium, potassium carbonate, one or both of bicarbonate, fluoride, hydrogen fluoride, and nitrate; fluoride is one or both of sodium fluoride, sodium hydrogen fluoride, potassium fluoride, and potassium hydrogen fluoride; The mass is 0.1%-1% of the ternary cathode material; the total mass of metal elements in metal salts and fluoride salts is 0.2%-4% of the ternary cathode material;

[0025] Step 2: transfer the mixed material obtained in step 1 to a ball mill for ball milling, the time for ball milling is 2h-10h, and th...

Embodiment 2

[0029] Based on the description of Embodiment 1, the following specific implementation methods are provided:

[0030] Step 1: Take 10g of NCA cathode material and 0.5g of sodium fluoride, and mix them evenly with a mortar;

[0031] Step 2: transfer the solid mixed powder in step 1 to a ball mill and mill at a speed of 500r / min for 3h;

[0032] Step 3: Put the solid powder after ball milling in Step 2 in a muffle furnace at 500 o Heat treatment at C temperature for 3h;

[0033] Step 4: Pass the heat-treated powder in Step 3 through a 300-mesh sieve to obtain the NCA cathode material co-doped with fluoride ions and sodium ions.

[0034] The NCA positive electrode material modified by sodium and fluoride ions is homogenized and coated with acetylene black and PVDF at a mass ratio of 8:1:1, and assembled into a half-cell, with a current of 0.5C (1C=190mA / g) The density is charged and discharged in the range of 2.8V-4.3V, and the specific capacity after 100 cycles is still 169mA...

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PUM

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Abstract

The invention discloses a lithium-oxygen codoping method of a ternary lithium ion anode material. The method comprises the steps of mixing a solid substance containing target cations and anions into the ternary lithium ion anode material, performing high energy ball milling to achieve completely uniform mixing, and performing low temperature sintering to form the lithium-oxygen codoped ternary lithium ion anode material. Due to lithium doping, a lithium layer channel can be enlarged; the disembedding resistance of lithium ions is reduced; the rate capability of the material is improved; fluorine doping of oxygen can improve cycling stability of the material; compared with the conventional liquid phase coprecipitation method, the method is short in flow, simple in technology, low in cost and applicable to large-scale plant production and can massively modify the anode material when the method is used for doping modification of the ternary anode material.

Description

technical field [0001] The invention relates to the technical field of new energy materials, in particular to a method for co-doping lithium-site and oxygen-site of a lithium-ion ternary positive electrode material. Background technique [0002] With the development of lithium-ion battery technology, lithium-ion battery cathode materials have gone through lithium cobalt oxide, lithium manganese oxide / lithium iron phosphate, and entered the era of the third generation of cathode materials - ternary NCM / NCA cathode materials. In particular, the cathode material system represented by NCM622, NCM811 and NCA has the advantages of large specific capacity, high discharge voltage, and low cost. [0003] The NCM / NCA cathode material itself still has some problems in the use process, because the ternary material has some inherent shortcomings, such as cycle stability due to phase transition under high voltage, and rate performance caused by lithium-nickel mixed arrangement worse. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/42C01G53/44C01P2006/40H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 汤依伟吴剑文定强
Owner QINGYUAN JIAZHI NEW MATERIAL RES INST CO LTD
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