A silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material and a preparation method thereof

A lithium nickel cobalt oxide and positive electrode material technology, applied in battery electrodes, electrical components, circuits, etc., can solve the problems of uneven discharge, poor safety performance, and short cycle life of materials, and achieve improved cycle performance and discharge specific capacity. Increased structural stability and extended safety effects

Active Publication Date: 2019-01-04
GEM JIANGSU COBALT IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of this, the main purpose of the present invention is to provide a silicon-titanium-fluorine co-doped nickel lithium cobalt oxide positive electrode material, which solves the problems of poor structural stability, short cycle life and poor safety performance of existing positive electrode materials; the present invention also provides The preparation method of the material is proposed, which solves the problem of uneven distribution of doping elements in the prior art, which causes uneven discharge of the material and causes large heat generation of the battery in the prior art.

Method used

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  • A silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material and a preparation method thereof
  • A silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material and a preparation method thereof
  • A silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material and a preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Preparation of LiNi 0.9 co 0.05 Si 0.03 Ti 0.02 o 1.95 f 0.05 Cathode material (where the average valence state of nickel is between +2 and +3);

[0036] Step 1, first weigh the nickel-cobalt composite precursor (composite hydroxide of nickel and cobalt) with a molar ratio of nickel and cobalt of 18:1, and then weigh it according to 3.16% of the total molar amount of nickel and cobalt in the nickel-cobalt composite precursor. Take silicon dioxide, weigh titanium dioxide according to 2.11% of the total molar weight of nickel and cobalt in the nickel-cobalt composite precursor, weigh ammonium fluoride according to 5.26% of the total molar weight of nickel and cobalt in the cobalt composite precursor, and weigh according to the molar ratio of lithium : Me (the sum of nickel and cobalt molar weights)=1.05:1 takes lithium nitrate and sets aside;

[0037] Step 2, adding the nickel-cobalt composite precursor, silicon dioxide, titanium dioxide, and ammonium fluoride in st...

Embodiment 2

[0041] Preparation of LiNi 0.9 co 0.05 Si 0.03 Ti 0.02 o 1.95 f 0.05 Cathode material (where the average valence state of nickel is between +2 and +3);

[0042] Step 1, first weigh the nickel-cobalt composite precursor (composite hydroxide of nickel and cobalt) with a molar ratio of nickel and cobalt of 18:1, and then weigh it according to 3.16% of the total molar amount of nickel and cobalt in the nickel-cobalt composite precursor. Take silicon dioxide, weigh titanium dioxide according to 2.11% of the total molar weight of nickel and cobalt in the nickel-cobalt composite precursor, weigh ammonium fluoride according to 5.26% of the total molar weight of nickel and cobalt in the nickel-cobalt composite precursor, and weigh according to the molar ratio Lithium: Me (the sum of nickel and cobalt molar weights) = 1.05: 1 Weigh lithium nitrate and set aside;

[0043] Step 2, adding the nickel-cobalt composite precursor, silicon dioxide, titanium dioxide, and ammonium fluoride in...

Embodiment 3

[0047] Preparation of LiNi 0.9 co 0.05 Si 0.03 Ti 0.02 o 1.95 f 0.05 Cathode material (where the average valence state of nickel is between +2 and +3);

[0048] Step 1, first weigh the nickel-cobalt composite precursor (composite hydroxide of nickel and cobalt) with a molar ratio of nickel and cobalt of 18:1, and then weigh it according to 3.16% of the total molar amount of nickel and cobalt in the nickel-cobalt composite precursor. Take silicon dioxide, weigh titanium dioxide according to 2.11% of the total molar weight of nickel and cobalt in the nickel-cobalt composite precursor, weigh ammonium fluoride according to 5.26% of the total molar weight of nickel and cobalt in the nickel-cobalt composite precursor, and weigh according to the molar ratio Lithium: Me (the sum of nickel and cobalt molar weights) = 1.05: 1 Weigh lithium nitrate and set aside;

[0049] Step 2, adding the nickel-cobalt composite precursor, silicon dioxide, titanium dioxide, and ammonium fluoride ...

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Abstract

The invention discloses a silicon-titanium-fluorine co-doped lithium nickel cobalt oxide cathode material, wherein the chemical expression is LinNiaCobSi(c-x)TixO(2-m)Fm; wherein 1 <= n <= 1.2, a+b+c=1, 0.00001 <= c/(a + b) <= 0. 1, x < c, 0 < m < 0.1; The invention also discloses a preparation method of the positive electrode material. As that positive electrode material of the invention is dopewith silicon, titanium and fluorine, the structural stability and safety of the positive electrode material are effectively improved, and the cycle life of the positive electrode material is prolonged; At first, that silicon source, Titanium source and fluorine source are premixed with Ni-Co composite precursor at ultra-high speed, and then lithium source and the mixture are further mixed at highspeed, which effectively improves the effect of uniform doping of silicon, titanium and fluorine in Ni-Co composite precursor, and also improves the cycle performance and discharge specific capacity of lithium nickel cobalt oxide battery.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a silicon-titanium-fluorine co-doped lithium nickel cobaltate positive electrode material and a preparation method thereof. Background technique [0002] Nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in IT products and new energy vehicles due to their high energy density and relatively simple preparation process; as the market demand for power battery energy density is getting higher and higher However, the structure stability of high-nickel materials is poor, and it is easy to collapse the material structure due to the deintercalation of Li ions and the change of the valence state of Ni, Co, and Mn ions during charging and discharging. , causing great harm to the cycle life and safety of the material. To solve these problems, doping is generally used to improve the structural stability of the material skeleton; dopin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/525
CPCH01M4/364H01M4/525Y02E60/10
Inventor 徐世国张明龙
Owner GEM JIANGSU COBALT IND CO LTD
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