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Anion/cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof

A lithium-ion battery and compound doping technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of insufficient cycle performance and rate performance of ternary materials, and achieve improved cycle performance, cost reduction, and particle size distribution. uniform effect

Inactive Publication Date: 2014-12-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ternary materials still have shortcomings such as insufficient cycle performance and insufficient rate performance.

Method used

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  • Anion/cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof
  • Anion/cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof
  • Anion/cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh analytically pure CH according to the stoichiometric ratio (1.02:0.388:0.194:0.388:0.03:0.03) 3 COOLi·2H 2 O, Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO)·4H 2 O, Mg(NO 3 ) 2 ·6H 2 O and LiCl were dissolved completely with deionized water respectively, and citric acid solution was added in an amount equal to the sum of the molar amounts of transition metal ions. After mixing evenly, adjust the pH value to about 7 with concentrated ammonia water;

[0030] (2) heating the mixed solution obtained in step (1) in a water bath at 60° C. to evaporate water, and stirring continuously to obtain a gel;

[0031](3) drying the gel body in a blast drying oven, the drying temperature is 80°C, and the drying time is 8 hours to obtain a dry gel body;

[0032] (4) Pre-calcining the dried gel, the pre-calcination temperature is 300°C, and the pre-calcination time is 4 hours to obtain the precursor; the precursor is naturally cooled to room temperature ...

Embodiment 2

[0034] (1) Weigh analytically pure LiNO according to the stoichiometric ratio (0.95:0.36:0.18:0.36:0.1:0.1) 3 , Ni(NO 3 ) 2 ·6H 2 O, Co(NO 3 ) 2 ·6H 2 O, Mn(NO 3 ) 2 4H 2 O, Mg(NO 3 ) 2 ·6H 2 O and LiCl were dissolved completely with deionized water respectively, and citric acid solution was added in an amount equal to the sum of the molar amounts of transition metal ions. After mixing evenly, adjust the pH value to about 7.5 with concentrated ammonia water;

[0035] (2) heating the mixed solution obtained in step (1) in a water bath at 80° C. to evaporate water, and stirring continuously to obtain a gel;

[0036] (3) drying the gel body in a blast drying oven, the drying temperature is 100° C., and the drying time is 10 hours to obtain a dry gel body;

[0037] (4) Pre-calcining the dried gel, the pre-calcination temperature is 400°C, and the pre-calcination time is 5 hours to obtain the precursor; the precursor is naturally cooled to room temperature and ground, a...

Embodiment 3

[0039] (1) Weigh analytically pure LiOH·H 2 O, Ni(CH 3 COO) 2 4H 2 O, Co(CH 3 COO) 2 4H 2 O, Mn(CH 3 COO)·4H 2 O, Mg(NO 3 ) 2 ·6H 2 O and LiCl were dissolved completely with deionized water respectively, then added citric acid solution in an amount equal to the sum of the molar amounts of transition metal ions, mixed evenly, and adjusted the pH value to about 8 with concentrated ammonia water;

[0040] (2) heating the mixed solution obtained in step (1) in a water bath at 90° C. to evaporate water, and stirring continuously to obtain a gel;

[0041] (3) drying the gel body in a blast drying oven, the drying temperature is 120° C., and the drying time is 12 hours to obtain a dry gel body;

[0042] (4) Pre-calcining the dried gel, the pre-calcination temperature is 500°C, and the pre-calcination time is 6 hours to obtain the precursor; the precursor is naturally cooled to room temperature and ground, and the ground precursor is ground at 900°C Carry out calcination, ...

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Abstract

The invention relates to an anion / cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material and a preparation method thereof, which belong to the lithium ion battery field. A general chemical formula of the cathode material is Li(Ni0.4Co0.2Mn0.4)1-xMxO2-yNy, M is Ti, Mg, Al or Cu; N is F, Cl or Br; x is greater than 0 and less than or equal to 0.15; and y is greater than 0 and less than or equal to 0.15. The preparation method comprises the following steps: weighing soluble lithium source, nickel source, manganese source, cobalt source and metal M salt and N salt according to mol ratio, respectively using deionized water for dissolving, adding a citric acid solution for uniformly mixing and stirring, using concentrated ammonia liquor to adjust pH value, and heating and evaporating to obtain gel, heating and drying the gel, performing twice calcination and grinding to obtain the anion / cation-doped and modified lithium ion battery (4:4:2)type ternary cathode material. The cathode material has the advantages of uniform particles, smooth surface, good crystallization performance, high specific capacity and cycle performance. The material is suitable for large scale production, and can be used for lithium ion batteries cathode material.

Description

technical field [0001] The invention relates to a lithium-ion battery (4:4:2) type ternary positive electrode material and a preparation method thereof, which are compound-doped and modified by anion and cation, and belong to the field of lithium-ion batteries. Background technique [0002] Energy, environmental issues, and information technology are the focus of today's society. The shortage of fossil fuels and the environmental pollution caused by combustion urgently require the research and development of renewable energy technologies. Due to its high energy conversion efficiency, chemical power sources have become one of the research hotspots in renewable energy technologies. Lithium-ion battery is the most potential chemical power source. To improve the performance of lithium-ion batteries, the cathode material is the key. [0003] At present, commercial lithium-ion batteries mainly use LiCoO 2 As a cathode material, but due to issues such as price and safety, LiCoO...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 张海朗杨威向南春
Owner JIANGNAN UNIV
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