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A kind of dual concentration gradient doped lithium ion battery positive electrode material and preparation method thereof

A lithium-ion battery, gradient doping technology, applied to battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as structural instability and capacity fading

Active Publication Date: 2022-05-13
JINGMEN GEM NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unstable structure of these cathodes, continuous phase transition occurs during cycling, and their capacity gradually decays during cycling.

Method used

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  • A kind of dual concentration gradient doped lithium ion battery positive electrode material and preparation method thereof
  • A kind of dual concentration gradient doped lithium ion battery positive electrode material and preparation method thereof

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preparation example Construction

[0025] The preparation method of double concentration gradient doping type lithium ion battery cathode material comprises the following steps:

[0026](1) prepare the salt solution of nickel, cobalt and manganese, the salt solution is a kind of in sulfate solution, nitrate solution or chloride solution. Salt solution comprises the first salt solution, the second salt solution, the 3rd salt solution, the 4th salt solution, the mol ratio of nickel ion, cobalt ion, manganese ion in the first salt solution is (85-95):(2-10 ): (2-10), the sum of the concentration of nickel ion, cobalt ion, manganese ion in the first salt solution is 2.00-5.00mol / L; In the second salt solution, the mol ratio of nickel ion, cobalt ion, manganese ion is (60-80):(10-20):(10-30), the sum of the concentration of nickel ion, cobalt ion, manganese ion in the second salt solution is 2.00-5.00mol / L; Nickel ion in the 3rd salt solution , cobalt ion, the mol ratio of manganese ion are (40-85):(5-30):(5-30), t...

Embodiment 1

[0034] Four kinds of nickel, cobalt and manganese sulfate solutions were prepared respectively; the four kinds of nickel, cobalt and manganese salt solutions were respectively the first salt solution, the second salt solution, the third salt solution and the fourth salt solution. The molar ratio of nickel ions, cobalt ions, and manganese ions in the first salt solution is 90:5:5, the total concentration of nickel ions, cobalt ions, and manganese ions in the first salt solution is 2.00mol / L, and in the second salt solution The molar ratio of nickel ions, cobalt ions, and manganese ions is 80:10:10, the total concentration of nickel ions, cobalt ions, and manganese ions in the second salt solution is 2.00mol / L, and the nickel ions, cobalt ions in the third salt solution , the molar ratio of manganese ions is 85:10:5, the total concentration of nickel ions, cobalt ions, and manganese ions in the third salt solution is 2.00mol / L, and the molar ratio of nickel ions, cobalt ions, and...

Embodiment 2

[0042] Four kinds of nickel, cobalt and manganese sulfate solutions were prepared respectively; the four kinds of nickel, cobalt and manganese salt solutions were respectively the first salt solution, the second salt solution, the third salt solution and the fourth salt solution. The molar ratio of nickel ions, cobalt ions, and manganese ions in the first salt solution is 95:3:2, the total concentration of nickel ions, cobalt ions, and manganese ions in the first salt solution is 2.00mol / L, and in the second salt solution The molar ratio of nickel ions, cobalt ions, and manganese ions is 70:10:20, the total concentration of nickel ions, cobalt ions, and manganese ions in the second salt solution is 2.00mol / L, and the nickel ions, cobalt ions in the third salt solution , the molar ratio of manganese ions is 75:15:10, the total concentration of nickel ions, cobalt ions, and manganese ions in the third salt solution is 2.00mol / L, and the molar ratio of nickel ions, cobalt ions, an...

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Abstract

The invention discloses a double-concentration gradient doped lithium-ion battery positive electrode material, the chemical formula of which is LiNi x co y mn z m 1‑x‑y‑z o 2 , wherein, 0.3<x<0.9, 0.01<y<0.15, 0.05<z<0.2, M is carbon, boron, magnesium, calcium, tungsten, molybdenum, tantalum, strontium, barium, titanium, vanadium, chromium, iron, copper , zirconium, aluminum in one or more. The preparation method of the material is first to prepare the salt solution, dope the salt solution, and then carry out the first and second co-precipitation reactions, and the obtained solid-liquid mixture is sequentially subjected to centrifugal washing, drying, sieving to remove iron, and hydrogen oxidation After the lithium is mixed, it is roasted, cooled, crushed and sieved to obtain a double-concentration-gradient-doped lithium-ion battery cathode material. The invention can obtain a precursor with uniform particle size and high tap density, and then mix and sinter the hydroxide precursor and lithium salt to obtain the lithium ion battery oxide cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to a double-concentration-gradient-doped lithium-ion battery cathode material and a preparation method thereof. Background technique [0002] Although Li batteries have been extensively studied in the past decades, they still face great challenges in meeting the high requirements of new applications, such as the cost and safety issues of large-scale batteries. The development of new battery materials and the optimization of existing battery materials are two main approaches to improve the performance of lithium batteries and further expand their applications. [0003] Generally, the synthesis process of lithium-ion battery cathode materials is divided into two steps: first, the hydroxide precursor is synthesized; then, the hydroxide precursor and lithium salt are mixed and sintered to obtain the lithium-ion battery oxide cathode material. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/62H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 许开华张坤范亮姣李聪黎俊陈康孙海波薛晓斐
Owner JINGMEN GEM NEW MATERIAL
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