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Doped modified lithium nickel cobalt manganese material, preparation method thereof and lithium ion battery

A lithium-nickel-cobalt-manganese, modified technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as battery capacity loss

Active Publication Date: 2013-09-11
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods all have certain defects: on the one hand, the bulk phase doping of inactive material elements will lead to the loss of battery capacity; on the other hand, in order to improve the rate performance and process performance of the battery, most ternary cathode materials use Spherical or spherical secondary particles, so whether it is doped on the surface of the precursor or the surface of the finished product, it can only be doped on the surface of the secondary particles, and the primary particles located inside the secondary particles are not protected. Since the surface of the secondary particles can be in contact with the electrolyte during charging and discharging, the doped material cannot meet the cycle and safety requirements of the battery at a higher voltage.

Method used

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  • Doped modified lithium nickel cobalt manganese material, preparation method thereof and lithium ion battery
  • Doped modified lithium nickel cobalt manganese material, preparation method thereof and lithium ion battery
  • Doped modified lithium nickel cobalt manganese material, preparation method thereof and lithium ion battery

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Experimental program
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Effect test

Embodiment 1

[0033] 1) According to the molecular formula Li(Ni 1 / 3 co 1 / 3 mn 1 / 3 )O 2 The proportion of transition metals to prepare NiSO 4 、CoSO 4 , MnSO 4 1:1:1 mixed aqueous solution, so that the concentration of cations in the mixed solution is 2mol / L, and is added dropwise to the reaction vessel at a speed of 0.2L / h;

[0034] 2) Add 2mol / L NaOH solution, 3mol / L ammonia solution and the mixed solution dropwise into the reaction vessel, control the pH value of the system at 11.0±0.2, heat the water bath to 50°C; after 12 hours of reaction, add the mass fraction at a certain flow rate 1% Nano Al 2 o 3 Water dispersion, the molar ratio of Al element to the sum of Ni, Co, and Mn elements is 0.001:1, continue to react for 4 hours, stop feeding, and age for 2 hours, after filtering, washing and vacuum drying at 120°C for 8 hours , to obtain the nano-Al 2 o 3 Modified nickel cobalt manganese hydroxide precursor powder;

[0035] 3) The modified powder obtained in step 2) is placed ...

Embodiment 2

[0039] Step 1), 3) are the same as embodiment 1, and step 2), 4) are as follows:

[0040] 2) Add 2mol / L NaOH solution, 3mol / L ammonia solution and the mixed solution dropwise into the reaction vessel, control the pH value of the system at 11.0±0.2, heat the water bath to 50°C; after 12 hours of reaction, add the mass fraction at a certain flow rate 1% Nano Al 2 o 3 Water dispersion, the molar ratio of Al element to the sum of Ni, Co, and Mn elements is 0.005:1, stop feeding after continuing to react for 8 hours, and age for 2 hours, after filtering, washing and vacuum drying at 120°C for 8 hours , to obtain the nano-Al 2 o 3 Modified nickel cobalt manganese hydroxide precursor powder;

[0041] 4) Combine the calcined precursor powder with Li 2 CO 3 According to the molar ratio Li / (Ni+Co+Mn)=1.05:1, mix evenly, and place it in a sintering furnace with an air atmosphere. After sintering at 900°C for 20 hours, the layered crystal structure can be obtained by grinding and si...

Embodiment 3

[0044] Step 1), 3) are the same as embodiment 1, and step 2), 4) are as follows:

[0045] 2) Add 2mol / L NaOH solution, 3mol / L ammonia solution and the mixed solution dropwise into the reaction vessel, control the pH value of the system at 11.0±0.2, heat the water bath to 50°C; after 12 hours of reaction, add the mass fraction at a certain flow rate 1% Nano Al 2 o 3 Water dispersion, the molar ratio of Al element to the sum of Ni, Co, and Mn elements is 0.01:1, continue to react for 8 hours, stop feeding, and age for 2 hours, after filtering, washing and vacuum drying at 120°C for 8 hours , to obtain the nano-Al 2 o 3 Modified nickel cobalt manganese hydroxide precursor powder;

[0046] 4) Combine the calcined precursor powder with Li 2 CO 3 According to the molar ratio Li / (Ni+Co+Mn)=1.05:1, mix evenly, and place it in a sintering furnace with an air atmosphere. After sintering at 900°C for 20 hours, the layered crystal structure can be obtained by grinding and sieving. ...

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Abstract

The invention discloses a doped modified lithium nickel cobalt manganese material, a preparation method thereof and a lithium ion battery. A secondary particle of the doped modified lithium nickel cobalt manganese material is composed of a primary particle and is spherical or spherical-like in shape, and the surface of the primary particle is non-uniformly doped with a nano metal oxide layer. In the preparation method, a precursor of the lithium nickel cobalt manganese material is doped with nano metal oxides during a synthesis stage and undergoes doping modification. Compared with the prior art, the doped modified lithium nickel cobalt manganese material is used as an anode activity material of the lithium ion battery, under a charge / discharge condition of 4.45 V, has good circulation and good thermal stability, and can meet requirements of high energy density, high power density, long service life and high safety of the lithium ion battery.

Description

technical field [0001] The invention belongs to the field of lithium-ion batteries, and more specifically, the invention relates to a multi-component oxide cathode material and a preparation method thereof, and a lithium-ion battery using the above-mentioned material. Background technique [0002] Compared with other traditional secondary batteries, lithium-ion batteries have many advantages such as small size, high voltage, large specific capacity, and high energy density. Therefore, they have made a series of great progress in the fields of consumer electronics such as mobile phones and notebook computers. With the development of smart phones and ultra-thin notebooks, as well as the demand for energy storage power stations and electric vehicles, people have higher requirements for the energy density of lithium-ion batteries. At present, the methods for improving the energy density of lithium-ion batteries are mainly as follows: 1) increasing the working voltage of the batt...

Claims

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Application Information

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IPC IPC(8): H01M4/134H01M4/1395H01M4/131H01M4/1391H01M4/66H01M4/62H01M10/0525
CPCY02E60/10
Inventor 郎野吴振豪何金华赵丰刚吴承仁
Owner NINGDE AMPEREX TECH
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