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Method for manufacturing cobalt nickel lithium manganate oxide as gradient anode active material of lithium ion battery

A cathode active material, a technology of lithium cobalt nickel manganese oxide, applied in the field of cathode material preparation of lithium ion batteries, can solve the problems to be improved, low first cycle efficiency, etc., so as to improve the charge-discharge capacity and cycle efficiency, and reduce the degree of cation mixing. , the effect of good electrochemical performance

Active Publication Date: 2011-10-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Document (1) reveals that Co coating on the positive electrode material is beneficial to improve the cycle performance of the positive electrode material, but the first cycle efficiency is still low and needs to be improved

Method used

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  • Method for manufacturing cobalt nickel lithium manganate oxide as gradient anode active material of lithium ion battery
  • Method for manufacturing cobalt nickel lithium manganate oxide as gradient anode active material of lithium ion battery
  • Method for manufacturing cobalt nickel lithium manganate oxide as gradient anode active material of lithium ion battery

Examples

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Effect test

Embodiment 1

[0024] A: Under the condition of constant temperature and mechanical stirring at 40°C, 6 mL of NH with a concentration of 6 mol / L 3 ·H 2 O solution and 6mL 1mol / L NaOH solution were mixed as the base liquid, and 0.2mol / L Co(NO 3 ) 2 Solution 3mL and 1mol / L Mn(NO 3 ) 2 Mix 8mL of the solution evenly, drop it into the reaction bottle through a dropper, and add 22mL of 1mol / L NaOH solution dropwise at the same time, react for 20min and then filter under reduced pressure to obtain a light brown precipitate, which is immersed in 6mol / L NH 3 ·H 2 O solution, ultrasonically disperse at room temperature for 30 min.

[0025] B: Add 1mol / L Co(NO 3 ) 2 Solution 1mL and 1mol / L Ni(NO 3 ) 2 Mix 6mL of the solution evenly, drop it into the reaction system through a dropper, and add 14mL of 1mol / L NaOH solution dropwise at the same time, react for 20min, and filter under reduced pressure to obtain a brown precipitate. Submerge the precipitate in 6mol / L NH 3 ·H 2 O solution, ultras...

Embodiment 2

[0031] A: Under the condition of constant temperature and mechanical stirring at 45°C, 7.5 mL of NH with a concentration of 6 mol / L 3 ·H 2 O solution and 7.5mL 1mol / L NaOH solution were mixed as the base liquid, and 0.3mol / L Co(NO 3 ) 2 Solution 1mL and 1mol / L Mn(NO 3 ) 2 Mix 12mL of the solution evenly, add dropwise to the reaction bottle through a dropper, and add 26mL of 1mol / L NaOH solution dropwise at the same time, react for 20min and then filter under reduced pressure to obtain a light brown precipitate, which is immersed in 6mol / L NH 3 ·H 2 O solution, ultrasonically disperse at room temperature for 30 min.

[0032] B: 0.6mol / L Co(NO 3 ) 2 Solution 1.5mL and 1mol / L Ni(NO 3 ) 2 Mix 4.6mL of the solution evenly, drop it into the reaction bottle through a dropper, and add 12mL of 1mol / L NaOH solution dropwise at the same time, react for 20min, and filter under reduced pressure to obtain a brown precipitate. Submerge the precipitate in 6mol / L NH 3 ·H 2 O soluti...

Embodiment 3

[0037] A: Under the condition of constant temperature and mechanical stirring at 45°C, 7 mL of NH with a concentration of 5 mol / L 3 ·H 2 O solution and 7mL 1mol / L NaOH solution were mixed as the base liquid, and 0.3mol / L Co(NO 3 ) 2 Solution 2mL and 1mol / L Mn(NO 3 ) 2 Mix 12mL of the solution evenly, drop it into the reaction bottle through a dropper, and add 28mL of 1mol / L NaOH solution dropwise with another dropper, react for 20min and filter under reduced pressure to obtain a light brown precipitate, which is immersed in 5mol / L NH 3 ·H 2 O solution, ultrasonically disperse at room temperature for 30 min.

[0038] B: 1mol / L Co(NO 3 ) 2 Solution 0.9mL and 1mol / L Ni(NO 3 ) 2Mix 4mL of the solution evenly, add dropwise through a dropper, and simultaneously add 10mL of 1mol / L NaOH solution dropwise, react for 20min, and filter under reduced pressure to obtain a brown precipitate. Submerge the precipitate in 5mol / L NH 3 ·H 2 O solution, ultrasonically disperse at roo...

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Abstract

The invention relates to a method for manufacturing a cobalt nickel lithium manganate oxide as a gradient anode active material of a lithium ion battery, belonging to the technical field of manufacturing the anode material of the lithium ion battery. In the method, a metal ion mixed solution with incremental Co<2+> concentrations is divided into multiple liquid-phase systems to realize coprecipitation for many times so as to manufacture NixCoyMn(l-x-y)(OH)2; the NixCoyMn(l-x-y)(OH)2 is taken as a precursor; and a high-temperature solid-phase reaction is utilized to obtain layered LiNixCoyMn(l-x-y)O2 with gradient Co content. The crystal lattice framework of the anode material with the gradient Co content manufactured by the method is more stable and the cation syncopation degree is reduced, so that the charge-discharge capacity and the cycle efficiency of the anode material are improved, thus the anode material has good electrochemical performances and can be applied to lithium ion batteries widely.

Description

Technical field: [0001] The invention relates to a preparation method of lithium cobalt-nickel-manganese oxide, a gradient cathode active material for lithium ion batteries, and belongs to the technical field of preparation of cathode materials for lithium ion batteries. Background technique: [0002] Today, with the rapid development of information technology and communication industry, lithium-ion batteries are widely used in information equipment such as mobile phones and notebooks due to their advantages such as high specific energy, long cycle life, good safety performance, no memory effect, and environmental friendliness. In the field of computers and other fields, the currently commercialized lithium-ion battery cathode material is mainly LiCoO 2 . However, compared with nickel and manganese, the price of cobalt is higher, and the environmental pollution is great, forcing people to seek LiCoO 2 As an alternative to lithium-ion batteries, the research on cathode mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/1391H01M4/525C01G53/00
CPCY02E60/10
Inventor 贾梦秋翟中楠国海鹏
Owner BEIJING UNIV OF CHEM TECH
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