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Anion doped modified lithium-excess (5:3:2) type ternary lithium ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as difficulty in ensuring batch stability, low material packing density, and irregular particles, and achieve improved cycle performance and magnification Good performance, cycle performance, smooth surface effect

Inactive Publication Date: 2014-07-23
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the three elements of nickel, manganese, and cobalt in the materials synthesized by the current preparation method are not uniformly distributed, and the particles are irregular, so that the bulk density of the material is low, and it is difficult to ensure batch stability.

Method used

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  • Anion doped modified lithium-excess (5:3:2) type ternary lithium ion battery cathode material
  • Anion doped modified lithium-excess (5:3:2) type ternary lithium ion battery cathode material
  • Anion doped modified lithium-excess (5:3:2) type ternary lithium ion battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 2

[0041] Example 2 Li 1+0.05 (Ni 0.5 mn 0.3 co 0.2 )O 2-005 f 005

[0042] (1) Add 0.1mol Ni(NO 3 ) 2 ·6H 2 O, 0.06mol Mn(NO 3 ) 2 ·6H 2 O, 0.04mol Co(NO 3 ) 2 ·6H 2 Dissolve O in 400mL deionized water to make a solution with a metal ion concentration of 0.5mol / L;

[0043] (2) Add 0.22mol (NH 4 ) 2 ·C 2 o 4 Dissolve in 800mL deionized water to form a 0.275mol / L solution (precipitating agent (NH 4 ) 2 ·C 2 o 4 The excess coefficient is 1.1);

[0044] (3) The metal solution prepared respectively in step (1) (2), (NH 4 ) 2 ·C 2 o 4 The solution was slowly added dropwise to the continuously stirring reaction kettle, and an ammonia solution with a mass percent concentration of 15% was added dropwise to adjust the pH value of the solution to 7.0, the rotation speed of the stirrer was adjusted to 400r / min, and the reaction temperature was 50°C;

[0045] (4) The material in the reactor in the step (3) was continuously stirred for 8 hours, and after the reactio...

Embodiment 3

[0048] Example 3 Li 1+0.1 (Ni 0.5 mn 0.3 co 0.2 )O 2-0.1 f 0.1

[0049] (1) Add 0.1mol NiSO 4 4H 2 O, 0.06mol MnSO 4 ·H 2 O, 0.04mol CoSO 4 ··7H 2 O was dissolved in 300mL deionized water to prepare a solution with a metal ion concentration of 0.67mol / L;

[0050] (2) 0.24mol (NH 4 ) 2 ·C 2 o 4 Dissolve in 600mL deionized water to form a 0.4mol / L solution (precipitating agent (NH 4 ) 2 ·C 2 o 4 The excess coefficient is 1.2);

[0051] (3) The metal solution prepared respectively in step (1) (2), (NH 4 ) 2 ·C 2 o 4 Slowly add the solution dropwise into the continuously stirring reaction kettle, and add dropwise an ammonia solution with a concentration of 15% by mass to adjust the pH value of the solution to 7.5, adjust the rotation speed of the stirrer to 500r / min, and the reaction temperature to 60°C;

[0052] (4) The material in the reactor in the step (3) was continuously stirred for 6 hours, and after the reaction was completed, it was further aged fo...

Embodiment 5

[0060] Example five Li 1+0.05 (Ni 0.5 mn 0.3 co 0.2 )O 2-0.05 Cl 0.05

[0061] (1) Add 0.1mol Ni(CH 3 COOH) 2 4H 2 O, 0.06mol Mn(CH 3 COOH) 2 4H 2 O, 0.04molCo(CH 3 COOH) 2 4H 2 O was dissolved in 500mL deionized water to prepare a solution with a metal ion concentration of 0.4mol / L;

[0062] (2) Add 0.2mol (NH 4 ) 2 ·C 2 o 4 Dissolve in 1000mL deionized water to form a 0.2mol / L solution;

[0063] (3) The metal solution prepared respectively in step (1) (2), (NH 4 ) 2 ·C 2 o 4 The solution is slowly added dropwise into the continuously stirring reaction kettle, and an ammonia solution with a mass percent concentration of 15% is added dropwise to adjust the pH value of the solution to 6.5, the rotation speed of the stirrer is adjusted to 300r / min, and the reaction temperature is 40°C;

[0064] (4) The material in the reactor in step (3) was continuously stirred for 10 hours, and after the reaction was completed, it was further aged for 6 hours to obtain a...

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Abstract

The invention relates to an anion doped modified lithium-excess (5:3:2) type ternary lithium ion battery cathode material and a preparing method thereof. The chemical formula of the cathode material is Li<1+x>(Ni<0.5>Mn<0.3>Co<0.2>)O<2-y>My, wherein the M is F, Cl or S; 0.02<=x<=0.15; and 0.02<=y<=0.1. The preparing method of the cathode material is characterized in that: an oxalate co-precipitation method is adopted, so that the three elements are uniformly mixed at the atom level, and a disadvantage that inert gas protection is needed in a process of a hydroxide co-precipitation method is overcome. In addition, a LiNi<0.5>Mn<0.3>Co<0.2>)O<2> material is subjected to modification by anion doping, thus further enhancing the cyclic performance and the rate capability of the material. The cathode material has characteristics of uniform particles, smooth surfaces, high tap density, high volume energy density, high specific capacity and good cyclic performance.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to an anion-doped modified perlithium (5:3:2) type ternary lithium ion battery cathode material and a preparation method thereof. Background technique [0002] With the intensification of the petrochemical energy crisis, finding alternative new energy sources and new materials that can be used for energy storage has become an important scientific research direction. As a new energy source, lithium-ion batteries have been widely used in electronic products such as mobile phones and digital cameras due to their advantages of high voltage, high capacity, no memory effect and long life, and will gradually be used in the field of electric vehicles. However, as far as several cathode materials for lithium-ion batteries have been commercialized, they are difficult to meet the requirements of power lithium-ion batteries due to some inherent shortcomings. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/48
CPCH01M4/362H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 张海朗宋腾飞
Owner JIANGNAN UNIV
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