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A kind of co/b co-coated nickel-cobalt-manganese lithium ion positive electrode material and preparation method thereof

A cathode material, nickel-cobalt-manganese-lithium technology, applied in battery electrodes, structural parts, electrical components, etc., can solve problems such as insufficient cycle performance and rate performance, improve cycle performance and safety performance, reduce flatulence, and improve electronic The effect of conductivity

Active Publication Date: 2021-04-06
GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the object of the present invention is to provide a Co / B co-coated nickel-cobalt-manganese lithium ion positive electrode material and a preparation method thereof, aiming at solving the problem that the cycle performance and rate performance of the existing nickel-cobalt-manganese lithium ion positive electrode material are not good enough technical issues

Method used

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  • A kind of co/b co-coated nickel-cobalt-manganese lithium ion positive electrode material and preparation method thereof
  • A kind of co/b co-coated nickel-cobalt-manganese lithium ion positive electrode material and preparation method thereof

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preparation example Construction

[0022] The Co / B co-coated nickel-cobalt-manganese lithium ion positive electrode material provided by the invention and its preparation method comprise 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 F and W and a certain amount of lithium source compound according to the expected ratio.

[0026] In this step, the molar amount of F and W added is 0.001% to 0.1% of the total molar amount of nickel, cobalt, and manganese in the nickel-cobalt-manganese precursor, and the compound containing F is one of F and Al, Mg, and Si. Compounds composed of one or more compounds, the compound of W is one or more of W oxides, halides, and sulfides, and the amount of...

Embodiment 1

[0039] (1.1) Weigh 100g Ni 0.83 co 0.11 mn 0.06 (OH) 2 Precursor, 0.1% doped AlF 3 (0.084g) with WO 3 (0.232g) 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. Sintered at 500°C for 240min at low temperature in an oxygen atmosphere, sintered at 800°C for 720min at high temperature, cooled to 600°C for 120min, and naturally cooled to 100°C to obtain a sintered F / W doped matrix material.

[0040] (1.2) Add 100g of primary sintered F / W doped matrix material into 50g deionized water at 40°C and stir for 10min, drop in 1mol / L cobalt sulfate, filter and wash after stirring for 10min, and dry it dynamically with 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 ...

Embodiment 2

[0052] (2.1) Weigh 100g Ni 0.80 co 0.10 mn 0.10 (OH) 2 Precursor, 0.1% doped AlF 3 (0.084g) with WO 3 (0.232g) was added after mixing evenly, lithium carbonate and precursor powder were added to the high-mixing equipment and mixed according to Li / (Ni+Co+Mn)=1.01:1.1. Sintered at 500°C for 240min at low temperature in an oxygen atmosphere, sintered at 800°C for 720min at high temperature, cooled to 600°C for 120min, and naturally cooled to 100°C to obtain a sintered F / W doped matrix material.

[0053] (2.2) Add 100g of primary sintered F / W doped base 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 naturally lowered t...

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Abstract

The present invention is applicable to the technical field of lithium batteries, and provides a Co / B co-coated nickel-cobalt-manganese lithium-ion positive electrode material and a preparation method thereof. The present invention mixes an appropriate amount of F / W in the manufacturing process of the lithium-ion positive electrode material. A small amount of F-ions and W6+ ions are added to improve cycle performance and safety performance. Due to the strong electronegativity of F-ions, it can inhibit the overflow of O2-ions, stabilize the structural stability of the material, and play the role of a skeleton. W6+ doped Impurity can improve the high-temperature cycle performance of the material; in addition, the present invention has carried out Co / B double coating during secondary sintering, and the positive electrode material coated with Co / B can effectively improve the cycle performance and electronic conductivity of the battery under high voltage ,Reduce the residual alkali, reduce flatulence, and reduce the occurrence of side reactions when the positive electrode material is in contact with the electrolyte.

Description

technical field [0001] The invention belongs to the technical field of lithium batteries, in particular to a Co / B co-coated nickel-cobalt-manganese lithium ion positive electrode material and a preparation method thereof. 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, the structure collapses during the cycle, and the electrical performance cycle becomes poor during the high temperature cycle, which causes great harm to the cycle life and safety of the material. To address these problems, a small amount of elements are generally used to improve high-temperature cycle performance and structural stability. When the positive electrode material i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/50H01M4/52H01M4/38H01M10/0525
CPCH01M4/366H01M4/38H01M4/50H01M4/52H01M10/0525Y02E60/10
Inventor 许开华张玉军徐世国张文艳田新勇陈玉君周晓燕刘钰王星宁李献帅
Owner GEM (HUBEI) NEW ENERGY MATERIALS CO LTD
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