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Preparation method of low residual alkali Li(NiCoAl)O2 cathode material

A technology of nickel-cobalt-lithium-aluminate and cathode materials, applied in battery electrodes, electrical components, circuits, etc., can solve problems such as battery explosion, reduced battery capacity, cycle life, and battery volume expansion

Inactive Publication Date: 2018-06-26
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Among them, the occurrence of the above-mentioned side reactions will not only reduce the performance of the battery capacity, cycle life, etc., but also cause the volume of the battery to expand, and in severe cases, the battery will explode.

Method used

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  • Preparation method of low residual alkali Li(NiCoAl)O2 cathode material
  • Preparation method of low residual alkali Li(NiCoAl)O2 cathode material
  • Preparation method of low residual alkali Li(NiCoAl)O2 cathode material

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preparation example Construction

[0043] One aspect of the present invention provides a method for preparing a nickel-cobalt lithium aluminate positive electrode material, wherein the method comprises the following steps:

[0044] Step 1. Mix the nickel-cobalt-aluminum hydroxide precursor with the lithium source, and perform pre-sintering.

[0045] According to a preferred embodiment of the present invention, in step 1, the nickel cobalt aluminum hydroxide precursor has the formula Ni 1-x-y co x Al y (OH) 2 Indicates that 0

[0046] According to a preferred embodiment of the present invention, in step 1, the lithium source is selected from lithium carbonate, lithium hydroxide, lithium nitrate, lithium oxalate, lithium fluoride, lithium bromide, lithium chloride, lithium acetate, lithium oxide, One or more of lithium dihydrogen phosphate and lithium phosphate.

[0047] In a further preferred embodiment, the lithium source is selected from one or more of lithium carbonate, lithium hydroxide,...

Embodiment approach

[0052] According to a preferred embodiment of the present invention, the mixing is by ball milling.

[0053] In a further preferred embodiment, the mixing adopts inclined ball milling.

[0054] Wherein, the purpose of mixing is to uniformly mix the lithium source and the nickel-cobalt-aluminum hydroxide precursor.

[0055] According to a preferred embodiment of the present invention, the mixing frequency of the ball mill is 8-14 Hz.

[0056] In a further preferred embodiment, the mixing frequency of the ball mill is 8-12 Hz.

[0057] In a further preferred embodiment, the frequency of the ball mill mixing is 8-10 Hz.

[0058] According to a preferred embodiment of the present invention, the mixing time of the ball mill is 2-10 hours.

[0059]In a further preferred embodiment, the time for ball milling and mixing is 2 to 6 hours.

[0060] In a further preferred embodiment, the ball milling time is 2-4 hours.

[0061] According to a preferred embodiment of the present inven...

Embodiment 1

[0108] Mix 50.00g of nickel-cobalt-aluminum hydroxide precursor with 23.20g of lithium carbonate, wherein the molar ratio of lithium source to NCA is 1.05, ball mill at 8Hz for 10h, and pre-sinter at 500°C for 6h, where the heating rate is 2°C / min, then cool down naturally;

[0109] The material obtained in step 1 is crushed, passed through a 300-mesh sieve, sieved 4 times, and then sintered for the second time. The sintering process is 5°C / min to 500°C, then 2°C / min to 760°C, and heat preservation for 10h After cooling with the furnace, the matrix material is obtained;

[0110] The matrix material obtained in step 2 was broken, and 2.93g of nano-cobalt hydroxide was added, passed through a 300-mesh sieve, and then sintered three times. ℃, keep warm for 6 hours, and then cool with the furnace to obtain nickel-cobalt-lithium-aluminate cathode material.

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Abstract

The invention discloses a preparation method of a low residual alkali Li(NiCoAl)O2 cathode material. The preparation method comprises following steps: 1, a nickel cobalt aluminium hydroxide precursoris mixed with a lithium source, and an obtained mixture is subjected to pre-sintering; 2, a product obtained in step 1 is smashed, and is subjected to sencondary sintering so as to obtain a matrix material; 3, the matrix material is smashed, an alkali treatment agent is added, and a third time of sintering is carried out after mixed so as to obtain the low residual alkali Li(NiCoAl)O2 cathode material. The pre-sintering is carried out at 300 to 700 DEG C, preferably at 400 to 650 DEG C, and more preferably at 400 to 600 DEG C, such as 500 DEG C; the secondary sintering is carried out at 600 to900 DEG C, preferably at 700 to 800 DEG C, and more preferably at 750 DEG C; and the third time of sintering is carried out at 600 to 900 DEG C, preferably at 700 to 800 DEG C, and more preferably at750 DEG C; the alkali treatment agent is one or a mixture of a plurality of ingredients selected from nanometer aluminium phosphate, nanometer alumina, nanometer aluminium hydroxide, nanometer cobaltous phosphate, nanometer cobalt oxide, and nanometer cobaltous hydroxide.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and in particular relates to a nickel-cobalt-lithium-aluminate cathode material, in particular to a preparation method of the nickel-cobalt-lithium-aluminate cathode material. Background technique [0002] Nickel cobalt lithium aluminate cathode material (NCA material) integrated LiNiO 2 and LiCoO 2 It has the advantages of high capacity under low pressure and low material cost. At the same time, the structural stability and safety of the material are enhanced after doping with aluminum, thereby improving the cycle stability of the material. [0003] However, generally, the residual alkali content on the surface of the nickel-cobalt-lithium-aluminate positive electrode material is relatively high, which leads to strong water absorption of the material, which will affect the stability of the positive electrode material slurry when making batteries. The increase in moisture will cause the bin...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/485
CPCH01M4/485H01M4/525Y02E60/10
Inventor 王燕超江卫军林若虚白珍辉朱晓沛周宏宝庞自钊苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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