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Y/La-doped Co/B co-coated nickel-cobalt-manganese ternary positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-manganese technology, which is applied in the field of Y/La doped Co/B co-coated nickel-cobalt-manganese ternary cathode material and preparation field, can solve the cycle performance and rate performance of nickel-manganese-manganese ternary cathode material To achieve the effect of stabilizing the crystal structure, improving the cycle performance and electrochemical performance, improving the cycle life and safety performance

Active Publication Date: 2018-09-18
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a Y / La-doped Co / B co-coated nickel-cobalt-manganese ternary positive electrode material and its preparation method, aiming to solve the cycle performance of the existing nickel-manganese-manganese ternary positive electrode material and technical issues with poor magnification performance

Method used

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  • Y/La-doped Co/B co-coated nickel-cobalt-manganese ternary positive electrode material and preparation method thereof
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preparation example Construction

[0022] The preparation method of the Y / La doped Co / B co-coated nickel-cobalt-manganese ternary positive electrode material provided by the present invention comprises the following steps:

[0023] Step S1, weighing the nickel-cobalt-manganese precursor.

[0024] The types of nickel-cobalt-manganese precursors are not limited here, such as NCM811, NCM523, NCM622 and the like.

[0025] Step S2, according to the metal content of nickel, cobalt and manganese in the nickel-cobalt-manganese precursor, weigh a certain amount of compound containing Y and La and a certain amount of lithium source compound according to the expected ratio.

[0026] Step S3, adding the Y- and La-containing compound together with the nickel-cobalt-manganese precursor and the lithium source compound into a high-speed mixer for thorough mixing, and then calcining to obtain a doped matrix material.

[0027] In this step, the nickel-cobalt-manganese precursor is mixed with Y and La compounds and a lithium sou...

Embodiment 1

[0037] (1.1) Weigh 100g Ni 0.83 co 0.11 mn 0.06 (OH) 2 Precursor, 0.1% doped Y 2 o 3 (0.127g) and La 2 o 3 (0.117g) was added after mixing evenly, lithium hydroxide and precursor powder were added to the high-speed mixer according to Li / (Ni+Co+Mn)=1.01:1.1 and mixed. Sintering at low temperature of 500°C for 240min in oxygen atmosphere, sintering at high temperature of 800°C for 720min, cooling to 600°C for 120min, natural cooling to 100°C to obtain a Y / La doped matrix material for primary sintering.

[0038] (1.2) Add 100g of primary sintered Y / La doped matrix material into 50g of deionized water at 40°C and stir for 10min, drop in 1mol / L cobalt sulfate, stir for 10min, filter and wash, and dry in a rotary evaporator for 60min , after drying in a vacuum oven at 120°C for 480 minutes, the positive electrode material powder coated with cobalt hydroxide was obtained, and then sintered at 700°C for 10 hours in an oxygen atmosphere, and then naturally cooled to 100°C to obt...

Embodiment 2

[0050] (2.1) Weigh 100g Ni 0.80 co 0.10 mn 0.10 (OH) 2 Precursor, 0.1% doped Y 2 o 3 (0.127g) and La 2 o 3 (0.117g) was added after mixing evenly, lithium carbonate and precursor powder were added to the high-mixing equipment according to Li / (Ni+Co+Mn)=1.01:1.1 and mixed. Sintering at low temperature of 500°C for 240min in oxygen atmosphere, sintering at high temperature of 800°C for 720min, cooling to 600°C for 120min, natural cooling to 100°C to obtain a Y / La doped matrix material for primary sintering.

[0051] (2.2) Add 100g of primary sintered Y / La doped matrix material into 50g of deionized water at 40°C and stir for 10min, drop in 1mol / L cobalt oxalate, stir for 10min, filter and wash, and dry in a rotary evaporator for 60min , After drying in a vacuum oven at 120°C for 480min, a positive electrode material powder coated with cobalt hydroxide was obtained, which was sintered for a second time at 700°C for 10 hours in an oxygen atmosphere, and the temperature was ...

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Abstract

The invention belongs to the technical field of lithium batteries, and provides a Y / La-doped Co / B co-coated nickel-cobalt-manganese ternary positive electrode material and a preparation method thereof. According to the present invention, the cycle performance and the safety performance are improved by doping a small amount of Y<3+> ions and La<3+> ions, wherein Y<3+> / La<3+> and Ni<3+> have the same valence state, the doped Y<3+> / La<3+> can enter the metal Ni<3+> position, the Y<3+> / La<3+> does not produce the valence change during the charge and discharge, is electrochemically inert, and doesnot produce the valence state change during the charge and discharge so as not to produce the volume change, such that the Y<3+> / La<3+> can act as the skeleton, stabilize the crystal structure, and improve the cycle life and the safety performance of the material; and under the high voltage, the Co / B co-coated positive electrode material can effectively improve the cycle performance and the electronic conductivity of the battery, reduce the residual alkali, and reduce the flatulence, such that the co-coated nickel-cobalt-manganese ternary positive electrode material can effectively prevent theoccurrence of side reactions so as to improve the cycle performance and the electrochemical performance of the lithium battery.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, and in particular relates to a nickel-cobalt-manganese ternary positive electrode material and a preparation method co-coated with Y / La doped Co / B. Background technique [0002] High-nickel nickel-cobalt-manganese ternary lithium-ion battery cathode materials are widely used in the field of HEV and PHEV new energy vehicles due to their low cost, low toxicity, and high energy density. But pure nickel cobalt lithium manganese oxide in the charge and discharge process Ni 2+ It is easy to enter the Li layer, the mixing is serious, and the Li ions are not easy to deintercalate, which will cause great harm to the cycle life and safety of the material. In addition, when the positive electrode material is in contact with the electrolyte, side reactions occur, and the thermal stability becomes poor. During the process of de-Li 4+ also become unstable. Contents of the invention [0003] In v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许开华张玉军徐世国徐中领许国干李伟王星宁刘钰
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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