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Preparation method of Ni-Co-Mn lithium ion battery electrode material

An ion electrode, nickel-cobalt-manganese-lithium technology, which is applied in the field of preparation of nickel-cobalt-manganese-lithium ion electrode materials to achieve the effects of improving electrochemical performance and reducing capacity decay

Active Publication Date: 2016-01-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Batteries made of existing electrode materials will have irreversible capacity fading during cycling, especially during high-rate cycling.

Method used

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  • Preparation method of Ni-Co-Mn lithium ion battery electrode material
  • Preparation method of Ni-Co-Mn lithium ion battery electrode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Dissolve polyvinylpyrrolidone-K30 in distilled water at a ratio of 6g / ml to obtain mixed solution A, and adjust the pH of the solution to 10.0 with 25% ammonia solution;

[0022] (2) Press NiSO 4 , MnSO 4 , CoSO 4 According to the molar ratio of Ni:Mn:Co=5:3:2, use distilled water to prepare nickel-cobalt-manganese mixed salt solution B, the total concentration of metal ions in the solution is 4mol / L; use distilled water to prepare mixed solution C of sodium hydroxide and ammonia water , wherein the concentration of sodium hydroxide solution is 4mol / L, and the concentration of ammonia water is 2mol / L;

[0023] (3) First add the prepared mixed solution A into the reaction kettle as the reaction bottom liquid, then add the prepared solution B and solution C dropwise into the 500ml volume reaction kettle at the same time (the temperature is 60 ℃) for stirring, in the Under the protection of nitrogen, the precipitate obtained by the reaction under ultrasonic cavitati...

Embodiment 2

[0027] (1) Dissolve polyvinylpyrrolidone-K30 in distilled water at a ratio of 4g / ml to obtain mixed solution A, and adjust the pH of the solution to 11 with 25% ammonia solution;

[0028] (2) The NiSO 4 Prepare nickel sulfate solution B with distilled water, and the total concentration of metal ions in the solution is 0.5mol / L; prepare mixed solution C of sodium hydroxide and ammonia water with distilled water, wherein the concentration of sodium hydroxide solution is 1mol / L, and the concentration of ammonia water is 0.4mol / L;

[0029] (3) First add the prepared mixed solution A into the reaction kettle as the reaction bottom liquid, then add the prepared solution B and solution C dropwise to the 500ml volume reaction kettle (temperature is 40 ℃) at the same time for stirring, Under the protection of nitrogen, the precipitation obtained by the reaction for 45 min under ultrasonic cavitation is nickel hydroxide; wherein, the ultrasonic power is controlled at 600W per liter of ...

Embodiment 3

[0033] (1) Dissolve polyvinylpyrrolidone-K30 in distilled water at a ratio of 10g / ml to obtain mixed solution A, and adjust the pH of the solution to 12.0 with 25% ammonia solution;

[0034] (2) MnSO 4 Prepare nickel sulfate solution B with distilled water, the total concentration of metal ions in the solution is 1mol / L; prepare mixed solution C of sodium hydroxide and ammonia water with distilled water, wherein the concentration of sodium hydroxide solution is 2mol / L, and the concentration of ammonia water is 2mol / L;

[0035] (3) First add the prepared mixed solution A into the reaction kettle as the reaction bottom liquid, then add the prepared solution B and solution C dropwise to the 500ml volume reaction kettle (at a temperature of 50°C) at the same time for stirring. Under the protection of nitrogen, the precipitation obtained by the reaction for 42 min under ultrasonic cavitation is manganese hydroxide; wherein, the ultrasonic power is controlled at 1800W per liter of...

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Abstract

The invention relates to a preparation method of a Ni-Co-Mn lithium ion battery electrode material and belongs to the field of a new energy technology. According to the invention, a mixed solution of sodium hydroxide and ammonia water is used as a precipitating agent, nickel sulfate, cobalt sulfate and manganese sulfate are used as metal salts, and a crystallization precipitation reaction is controlled to prepare a nickel-cobalt-manganese mixed hydroxide. Before adding a reaction solution drop by drop, a certain amount of polyvinylpyrrolidone-K30 is dissolved in a base solution to be used as a crystal-growing controlling agent; and then, under the protection of the inert gas nitrogen, crystal growth process of a resultant is controlled through synergism of ultrasonic cavatition and dispersion and the crystal-growing controlling agent. Then, the crystal morphology is controlled. The whole reaction process is carried out at normal pressure and at the temperature of less than 100 DEG C, and the reaction condition is mild. The coprecipitation product is a composite hydroxide nanosheet with a brucite structure, and no other impure phases are formed. The size of the nanosheet is 100-400 nm, and thickness is about 5-10 nm.

Description

technical field [0001] The invention relates to a preparation method of a nickel-cobalt-manganese lithium ion electrode material, and belongs to the technical field of new energy. Background technique [0002] Transition metal hydroxide and oxide nanocrystals have received extensive attention due to their potential applications in energy, catalyst, gas detection, and magnetism. Especially in the field of new energy, hydroxides such as nickel-cobalt can be used as excellent electrode materials for alkaline secondary batteries; hydroxides such as nickel-cobalt-manganese can also be used as alternative electrodes for supercapacitors; in addition, nickel-cobalt-manganese lithium ion electrode materials Can be used to prepare lithium ion battery cathode material LiNi x Co y Mn z O 2 . [0003] In the field of lithium-ion batteries, nickel-cobalt-manganese ternary cathode material nickel-cobalt-manganese lithium manganese oxide is a high-performance lithium-ion battery cathod...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525
CPCY02E60/10
Inventor 张正富孙冬吴天涯张竞
Owner KUNMING UNIV OF SCI & TECH
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