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A doped modified cathode material with high ion channel stability

A cathode material and ion channel technology, applied in the field of doping and modified cathode materials, can solve the problems of poor cycle performance of cathode materials, and achieve the effects of improving heat dissipation performance and enhancing electrical conductivity.

Active Publication Date: 2022-05-10
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor cycle performance of positive electrode materials in lithium batteries in the prior art, and to provide a doped modified positive electrode material with high ion channel stability. The positive electrode material with stable channels and good overall performance makes the prepared lithium battery positive electrode material have strong cycle performance and long service life, which can effectively realize the material selection and process optimization of lithium ion batteries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The preparation process of described loaded nickel cobalt lithium manganese oxide is:

[0034] (1) Made into a three-dimensional arrangement framework: the MnSO 4 4H 2 O was dispersed in ethanol and sonicated for 20-30 min to obtain Mn 2+ Solution, mix terephthalic acid, vinyl acetate, vinyl terephthalic acid and dimethylacetamide according to the mass ratio to obtain a mixed solution, and then pour the mixed solution into Mn 2+ In the solution, stir at 96-100°C for 0.8-1.2h to obtain a ligand solution, then add diethylenetriamine solution, raise the temperature to 115-120°C and stir for 1.8-2h, and cool down to room temperature to form a three-dimensional arrangement framework; MnSO 4 4H 2 The ratio of O and ethanol is 1.2-1.4g: 80mL; the mass ratio of terephthalic acid, vinyl acetate, vinyl terephthalic acid and dimethylacetamide is 1:1.05-1.3:1.1-1.3:1.5-1.6; mn 2+ The volume ratio of solution, mixed solution and diethylenetriamine solution is 1:2.8-3.6:0.6-0.8;...

Embodiment 1

[0040] A doped modified positive electrode with high ion channel stability, the doped modified positive electrode material is: lithium manganese iron phosphate material is mixed with nickel-cobalt lithium manganese oxide at a mass ratio of 1:0.32.

[0041] The preparation process of described loaded nickel cobalt lithium manganese oxide is:

[0042] (1) Made into a three-dimensional arrangement framework: the MnSO 4 4H 2 O was dispersed in ethanol and sonicated for 25 min to obtain Mn 2+ Solution, mix terephthalic acid, vinyl acetate, vinyl terephthalic acid and dimethylacetamide according to the mass ratio to obtain a mixed solution, and then pour the mixed solution into Mn 2+ solution, stirred at 98°C for 1.0h to obtain a ligand solution, then added diethylenetriamine solution, raised the temperature to 118°C and stirred for 1.9h, and cooled to room temperature to form a three-dimensional arrangement framework; MnSO 4 4H 2 The ratio of O and ethanol is 1.3g: 80mL; the ma...

Embodiment 2

[0048] A doped modified positive electrode with high ion channel stability, the doped modified positive electrode material is: lithium manganese iron phosphate material is mixed with nickel-cobalt lithium manganese oxide at a mass ratio of 1:0.35.

[0049] The preparation process of described loaded nickel cobalt lithium manganese oxide is:

[0050] (1) Made into a three-dimensional arrangement framework: the MnSO 4 4H 2 O was dispersed in ethanol and sonicated for 28 min to obtain Mn 2+ Solution, mix terephthalic acid, vinyl acetate, vinyl terephthalic acid and dimethylacetamide according to the mass ratio to obtain a mixed solution, and then pour the mixed solution into Mn 2+ solution, stirred at 97°C for 1.1h to obtain a ligand solution, then added diethylenetriamine solution, raised the temperature to 116°C and stirred for 1.95h, and cooled to room temperature to form a three-dimensional arrangement framework; MnSO 4 4H 2 The ratio of O and ethanol is 1.25g: 80mL; the ...

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Abstract

The invention relates to the field of positive electrode materials for lithium batteries. Aiming at the problem of poor cycle performance of positive electrode materials in existing lithium batteries, a doped modified positive electrode material with high ion channel stability is disclosed. The doped modified positive electrode material is: The loaded nickel-cobalt lithium manganese oxide is mixed with lithium manganese iron phosphate material, and the mass ratio of loaded nickel-cobalt lithium manganate to lithium manganese iron phosphate material is 1:0.25‑0.4. The preparation process of the supported nickel-cobalt lithium manganese oxide is as follows: (1) making a three-dimensional arrangement framework; (2) making the first support structure; (3) selectively dissolving; (4) grafting active groups; (5) )load. The invention can prepare positive electrode materials with good thermal conductivity, electrical conductivity, high stability channels and good integrity performance, so that the prepared lithium battery positive electrode materials have strong cycle performance and long service life, and can effectively realize Material selection and process optimization for lithium-ion batteries.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium batteries, in particular to a doped modified positive electrode material with high ion channel stability. Background technique [0002] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive and negative electrodes to work. During the charging and discharging process, Li ions intercalate and deintercalate back and forth between the two electrodes: when charging, Li ions are deintercalated from the positive electrode, inserted into the negative electrode through the electrolyte, and the negative electrode is in a lithium-rich state; the opposite is true during discharge. At present, there are many ways to improve the cycle performance of lithium-ion batteries. Select stable materials, including positive and negative electrodes and electrolyte materials, and then combine them in the most reasona...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/58H01M10/0525H01M10/613H01M10/653H01M10/654
CPCH01M4/364H01M4/505H01M4/525H01M4/5825H01M10/0525H01M10/613H01M10/653H01M10/654H01M2004/028H01M2004/021Y02E60/10
Inventor 汉海霞陈瑶许梦清
Owner WANXIANG 123 CO LTD