Vanadium-substituted ternary positive electrode material for lithium ion batteries and preparation method thereof

A lithium-ion battery, cathode material technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve the problems of low gram capacity in the first cycle, poor rate performance, cycle capacity decay, etc., and reduce cation mixing. , Long cycle life, the effect of increasing cycle efficiency

Pending Publication Date: 2019-06-04
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them LiNi 0.6 co 0.2 mn 0.2 o 2 It has the advantages of high specific capacity, wide voltage range and low environmental toxicity, but has the disadvantages of low first-cycle discharge gram capacity, serious cycle capacity decay, and poor rate performance.

Method used

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  • Vanadium-substituted ternary positive electrode material for lithium ion batteries and preparation method thereof
  • Vanadium-substituted ternary positive electrode material for lithium ion batteries and preparation method thereof
  • Vanadium-substituted ternary positive electrode material for lithium ion batteries and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0041] Battery preparation and electrochemical performance testing methods:

[0042] (1) Preparation of battery cathode sheet:

[0043] 0.56g lithium ion cathode material Li[Ni 0.6 co 0.2 mn 0.2 ] 1-x V x o 2 , 0.07g conductive carbon powder, 0.07g polyvinylidene fluoride (PVDF), mix evenly according to the mass ratio of 8:1:1, then add 0.035ml NMP solvent, fully stir to form a viscous slurry, and evenly coat the surface of the aluminum foil , dried by blowing air, placed in a vacuum oven at 120°C for 12 hours, and obtained the positive electrode sheet after rolling for many times.

[0044] (2) Battery assembly and performance testing:

[0045] Obtaining vanadium-substituted LiNi evaluated using 2016-type half-cells 0.6 co 0.2 mn 0.2 o 2 Electrochemical properties of cathode materials. Punch the rolled battery pole piece into a disc with a diameter of 12mm. After accurately weighing its mass, calculate the Li[Ni 0.6 co 0.2 mn 0.2 ] 1-x V x o 2 The quality of ...

Embodiment 1

[0048] A method for preparing a ternary positive electrode material replaced by vanadium for a lithium ion battery, the raw materials used in the preparation process, calculated by mass fraction, include:

[0049] Hydroxygen precursor: 228 parts,

[0050] Lithium hydroxide: 110 parts,

[0051] Vanadium pentoxide: 1.1 parts,

[0052] Its preparation process specifically comprises the following steps:

[0053] 1) Weigh 228 parts by weight of the hydrogen-oxygen precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 , 110 parts by weight of lithium hydroxide, 1.1 parts by weight of vanadium pentoxide, mixing the powder precursor into a mortar;

[0054] 2) Add 800 parts by weight of alcohol to the powder precursor mixture obtained in step 1), and grind it until it is evenly mixed to obtain a powder precursor mixture;

[0055] 3) Move the powder precursor mixture obtained in step 2) to a tablet press, and press it into a tablet under a pressure of 4MPa;

[0056] 4) move the precursor mixtur...

Embodiment 2

[0061] A method for a ternary positive electrode material replaced by vanadium ions for a lithium ion battery, the raw materials used in the preparation process, calculated by mass fraction, include:

[0062] Hydroxygen precursor: 228 parts

[0063] Lithium hydroxide: 110 parts

[0064] Vanadium pentoxide: 1.1 parts

[0065] Its preparation process specifically comprises the following steps:

[0066] 1) Weigh 228 parts by weight of the hydrogen-oxygen precursor Ni 0.6 co 0.2 mn 0.2 (OH) 2 , the lithium hydroxide of 110 parts by weight, the vanadium pentoxide of 1.1 parts by weight, put the powder precursor mixture into the mortar;

[0067] 2) Add 800 parts by weight of alcohol to the powder precursor mixture obtained in step 1), and grind for 1 to 2 hours until the mixture is evenly mixed to obtain a powder precursor mixture;

[0068] 3) Move the powder precursor mixture obtained in step 2) to a tablet press, and press it into a tablet under a pressure of 4MPa;

[0069] ...

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Abstract

The invention provides a vanadium-substituted ternary positive electrode material for lithium ion batteries and a preparation method thereof. The vanadium-substituted ternary positive electrode material for lithium ion batteries is characterized by having a structural formula of Li[Ni0.6Co0.2Mn0.2]1-xVxO2, wherein x is greater than or equal to 0.005 and smaller than or equal to 0.01. The preparation method of the vanadium-substituted ternary positive electrode material for lithium ion batteries is characterized by comprising the steps of: weighing 225-228 weight parts of a hydrogen-oxygen precursor Ni0.6Co0.2Mn0.2(OH)2 and 110 weight parts of lithium hydroxide and 1.1-4.5 weight parts of vanadium pentaoxide, placing the substances in a mortar, and performing grinding until the substances are mixed evenly to obtain a powder precursor mixture; and conducting pressing into tablets, and performing calcination to obtain the vanadium-substituted Li[Ni0.6Co0.2Mn0.2]1-xVxO2 positive electrodematerial for lithium ion batteries. The lithium ion battery positive electrode material obtained by the invention shows high specific discharge capacity and good cycle performance, and has excellent application prospects in the future lithium ion battery energy storage system.

Description

technical field [0001] The invention belongs to the field of chemical industry and relates to a lithium ion battery, in particular to a ternary positive electrode material replaced by vanadium in the lithium ion battery and a preparation method thereof. Background technique [0002] As a new type of energy storage material, lithium-ion batteries are widely used in today's market. They are mainly used in various fields around the world, from small portable electronic devices to large electric vehicles, and have become a research hotspot in recent years. Layered nickel-cobalt-manganese composite cathode material is a very promising lithium-ion cathode material. Compared with LiNiO 2 、LiCoO 2 and LiMnO 2 Ternary materials have the following characteristics: low cost, large discharge specific capacity, good cycle performance, good rate performance, good thermal stability, relatively stable structure, etc. The ternary material combines the advantages of the three materials, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/38H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525
CPCY02E60/10
Inventor 章冬云杜利春王乃占周江王蒙蒙孙光翰常程康
Owner SHANGHAI INST OF TECH
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