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High-voltage mono-crystal lithium nickel cobalt manganese oxide anode material and preparation method thereof

A technology of nickel-cobalt lithium manganese oxide and positive electrode materials, which is applied in the field of lithium-ion batteries, can solve problems such as cycle performance needs to be improved, product consistency is difficult to guarantee, cycle performance is not mentioned, etc., and it is convenient for large-scale production, room temperature and high temperature Excellent cycle performance, high temperature capacity retention and improved capacity recovery

Active Publication Date: 2014-11-05
贵州容百锂电材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN101847722A published in 2009 introduced a method for preparing a single crystal nickel-cobalt multi-component material. The prepared material has a small part of agglomerated single crystal morphology, the test voltage is relatively low, and the cycle performance is not mentioned.
CN103500827A published in January 2014 introduced a preparation method of a multi-component lithium-ion cathode material, which has superior high-temperature performance, but the process is complicated, the process is difficult to control, and the consistency of the final product is difficult to guarantee
CN103715412A published in May 2014 introduced a high-voltage nickel-cobalt lithium manganese oxide material. Its cycle performance needs to be improved, and its high-temperature performance is not mentioned. It is difficult to meet the requirements of existing battery manufacturers for high-voltage materials above 4.4V.
Under high voltage (especially above 4.4V), as the number of cycles increases, secondary particles or agglomerated single crystals may appear pulverization at the primary particle interface or separation of agglomerated single crystals in the later stage, and the internal resistance becomes larger and the battery capacity The attenuation will be fast, and the high temperature cycle is also prone to diving

Method used

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  • High-voltage mono-crystal lithium nickel cobalt manganese oxide anode material and preparation method thereof
  • High-voltage mono-crystal lithium nickel cobalt manganese oxide anode material and preparation method thereof
  • High-voltage mono-crystal lithium nickel cobalt manganese oxide anode material and preparation method thereof

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Effect test

Embodiment 1

[0029] 1) Nickel sulfate, cobalt sulfate, and manganese sulfate are dissolved in deionized water at a ratio of 5:2:3 by Ni, Co, and Mn to prepare a mixed salt solution with a total concentration of metal cations of 1.2mol / L, 200kg in total, And add 0.2kg of aluminum sulfate, stir to make it fully mixed to obtain a mixed salt solution.

[0030] 2) Prepare 5mol / L sodium hydroxide solution and 3mol / L ammonia water respectively, then pump the prepared solution into the reaction kettle separately at a rate of 0.4L / h and stir, while controlling the sodium hydroxide and ammonia water The flow rate of the aqueous solution is such that the pH value of the mixed solution is 9.7, and the temperature of the reaction kettle is controlled at 45°C during the process; the stirring speed is 300rpm, and the mixed salt solution to be prepared is added into the reaction kettle and continued to stir and age for 12h, and then the obtained The solid-liquid mixture was separated by centrifugal filtra...

Embodiment 2

[0035] 1) Nickel nitrate, cobalt nitrate, and manganese nitrate are dissolved in deionized water at a ratio of 1:1:1 by Ni, Co, and Mn to form a salt solution with a total concentration of metal cations of 1.4mol / L, 200kg in total, and Add 0.1 kg of zirconium nitrate, stir to make it fully mixed to obtain a mixed salt solution.

[0036] 2) Prepare 4mol / L sodium hydroxide solution and 4mol / L ammonia water respectively, then pump the prepared solution into the reaction kettle separately at a rate of 0.6L / h and stir, while controlling the sodium hydroxide and ammonia water The flow rate of the aqueous solution is such that the pH value of the mixed solution is 9.2, and the temperature of the reaction kettle is controlled at 60°C during the process; the stirring speed is 400rpm. After adding all the prepared salt solution into the reaction kettle, continue to stir and age for 16h, and then the obtained solid-liquid mixture After separation by centrifugal filtration, the solid was ...

Embodiment 3

[0041] 1) Nickel nitrate, cobalt nitrate, and manganese nitrate are dissolved in deionized water in a ratio of 5:2:3 by Ni, Co, and Mn to prepare a salt solution with a total metal cation concentration of 1.8mol / L, 200kg in total, and Add 0.2kg, stir to make it fully mixed to obtain a mixed salt solution.

[0042] 2) Prepare 3mol / L sodium hydroxide solution and 5mol / L ammonia water respectively, then pump the prepared solution into the reaction kettle separately at a rate of 0.7L / h and stir, while controlling the sodium hydroxide and ammonia water The flow rate of the aqueous solution is such that the pH value of the mixed solution is 9.8, and the temperature of the reaction kettle is controlled at 70°C during the process; the stirring speed is 200rpm, and all the salt solution to be prepared is added to the reaction kettle and continued to stir and age for 8 hours, and then the obtained solid-liquid mixture Separation by centrifugal filtration, washing the solid with deionize...

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Abstract

The invention relates to a high-voltage mono-crystal lithium nickel cobalt manganese oxide anode material and a preparation method thereof. The molecular formula of the anode material is LiNixCoyMn1-x-yMzO2, wherein M is one or more of Ti, Mg, Al, Zr, La, Ce, B and Sn, and the values of x, y and z meet the conditions as below simultaneously: 0<=x<=1, 0<=y<=0.3, and 0<=z<=0.8. The prepared high-voltage LiNixCoyMn1-x-yMzO2 is made up of micron-sized mono-crystal particles, and the average size of the mono-crystal particles is 2 to 15 microns. The LiNixCoyMn1-x-yMzO2 anode material has the advantages of high electrochemical property, high compaction density, good property of processing pole pieces, good high / low-temperature circulating property and rate capability, good high-temperature storage property and safety property and wide voltage application range of 4.35V to 4.6V, and the anode material can be used in the CE and EV markets widely.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a preparation method of a high-voltage single crystal nickel-cobalt lithium manganese oxide material. Background technique [0002] Lithium-ion batteries have been widely used because of their excellent properties such as high voltage, high capacity, high cycle, and good thermal stability. With the development of science and technology, lithium cobalt oxide is subject to its structural stability and price, and its position will be replaced by other materials in the near future. Although the structural stability of lithium cobaltate under high voltage can be improved through the doping and coating process, so that its cycle life can fully meet the existing needs; however, the further increase in cost due to the doping and coating process will limit its application range. Due to the excellent safety of ternary materials, there is no problem of structure collapse afte...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525C01G45/12
CPCC30B1/10C30B29/10H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李勇华陈明峰戚洪亮芦亚婷黄连友张世龙王顺林
Owner 贵州容百锂电材料有限公司
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