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Lithium ion battery cathode material and preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation, can solve problems such as low specific capacity, and achieve high energy density, good stability, and high particle consistency

Active Publication Date: 2020-06-02
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The layered cathode material prepared by this method has a high compaction density, but its specific capacity is low

Method used

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  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery
  • Lithium ion battery cathode material and preparation method thereof and lithium ion battery

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preparation example Construction

[0029] The preparation method of the positive electrode material of lithium ion battery of the present invention has certain requirements on the morphology and physical and chemical indicators of the ternary precursor, and its tap density should not be lower than 1.5g / cm 3 , the specific surface area is not less than 10m 2 / g, the morphology should be spherical or spherical precursor particles formed by the aggregation of blade-like primary particles.

[0030] The lithium source used in the preparation method of the lithium ion battery positive electrode material of the present invention is at least one of lithium nitrate, lithium acetate, lithium oxide, lithium oxalate, lithium hydroxide monohydrate or lithium carbonate.

[0031] The atmosphere used during sintering during the preparation process of the positive electrode material of the lithium ion battery of the present invention is an aerobic atmosphere, and oxygen or air can be used.

[0032] The lithium ion battery posi...

Embodiment 1

[0035] The preparation method of the present embodiment comprises the following steps:

[0036] (1) The ternary precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 (Ningxia Dongfang Tantalum Co., Ltd.), Lithium Carbonate, B 2 o 3 After mixing evenly in a high-speed mixer, sintering at 930°C for 5.5h in an air atmosphere to obtain an intermediate product; the amount of Li in lithium carbonate and the sum of the amounts of Ni, Co and Mn in the ternary precursor The ratio is 1.02:1, B 2 o 3 The mass of the ternary precursor is 0.1% of the mass of the ternary precursor; the tap density of the ternary precursor used is 1.76g / cm 3 , D50 is 3.68μm, specific surface area is 13.9m 2 / g;

[0037] (2) The resulting intermediate product is crushed through a 325 mesh sieve, then lithium hydroxide monohydrate is added so that the ratio of the amount of Li to the sum of the amount of matter of Ni, Co, and Mn is 1.08:1, and mixed uniformly It can be obtained by sintering at 950°C for 7h in an air...

Embodiment 2

[0039] The preparation method of the present embodiment comprises the following steps:

[0040] (1) The ternary precursor Ni 0.83 co 0.07 mn 0.1 (OH) 2 (Ningxia Dongfang Tantalum Co., Ltd.), Li 2 CO 3 , AlF 3 After mixing evenly in a high-speed mixer, sintering at 800°C for 10 hours in an air atmosphere to obtain an intermediate product; the ratio of the amount of Li in lithium carbonate to the sum of the amounts of Ni, Co, and Mn in the ternary precursor 1.0:1, B 2 o 3 The mass of the ternary precursor is 0.2% of the mass of the ternary precursor; the tap density of the ternary precursor used is 1.82g / cm 3 , D50 is 4.1μm, specific surface area is 14.2m 2 / g;

[0041] (2) The resulting intermediate product is crushed through a 325 mesh sieve, then lithium hydroxide monohydrate is added so that the ratio of the amount of Li to the sum of the amount of matter of Ni, Co, and Mn is 1.05:1, and mixed uniformly Sintered at 850°C for 12h in an air atmosphere.

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Abstract

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a lithium ion battery cathode material and a preparation method thereof and a lithium ion battery. The preparation method of the lithium ion battery cathode material comprises the following steps: (1) uniformly mixing a ternary precursor, a lithium source and an auxiliary agent, and keeping the temperature at 600-980 DEG C for 5-15 hours to obtain an intermediate product, wherein the chemical formula of the ternary precursor is NixCoyD(1-x-y)(OH)2, x is greater than 0 and less than or equal to 1,y is greater than 0 and less than or equal to 1, x+y is greater than 0 and less than 1, and D is one of Mn and Al elements, the auxiliary agent is one or more of AlF3, KF, LiF, NaCl, KCl, H3BO3 and B2O3; and (2) uniformly mixing the intermediate product with a lithium source, and keeping the temperature at 650-980 DEG C for 5-15 hours to obtain the lithium ion battery cathode material. The cathode material prepared according to the preparation method disclosed by the invention is relatively good in crystal structure and relatively high in particle consistency; when the material is used as a cathode active material for a lithium ion battery, the lithium ion battery has relatively high energy density.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a lithium ion battery cathode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Layered nickel-cobalt-manganese ternary materials have the advantages of high specific capacity, good safety performance, and low production cost, and their status in the lithium battery industry is steadily rising. Compared with conventional ternary materials, single crystal ternary materials have good cycle stability; high mechanical strength, and are not easily broken during electrode compaction; low specific surface area, effectively reducing side reactions; smooth surface, can be better with conductive agents The contact is conducive to the transmission of lithium ions. A common preparation method for single crystal ternary materials is to mix nickel, cobalt, manganese and lithium sources according to the amount of the corr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 李云峰罗传军陈腾飞薛旭金侯炳虎焦玉春连云峰靳俊杰杨阳郑刚剑白方磊李莉
Owner DO FLUORIDE CHEM CO LTD
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