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Method for improving electrochemical performance of high-nickel ternary positive electrode material of lithium ion battery

A lithium-ion battery and positive electrode material technology, applied in the field of lithium ion positive electrode material preparation, can solve the problems of large reversible capacity loss, high storage condition requirements, and coating dependence, so as to improve electrochemical performance, promote ion transmission, and avoid direct The effect of contact

Inactive Publication Date: 2017-08-18
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Abstract
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Problems solved by technology

[0003] High-nickel ternary cathode materials have received widespread attention, because nickel-cobalt-manganese ternary cathode materials show higher specific capacity with the increase of nickel content, but the higher the nickel content is not the better, the increase of nickel content leads to three The rate characteristics and storage performance of metamaterials deteriorate
High nickel ternary materials are easy to absorb water, and CO in the air 2 、H 2 O has an irreversible reaction, which requires high storage conditions; high-nickel ternary materials have a large loss of reversible capacity for the first charge and discharge, and the dissolution of nickel ions in the electrolyte during charge and discharge will gradually reduce the charge-discharge specific capacity, especially at high rates. The lower capacity decays rapidly and the rate characteristic decreases
[0004] Researchers often use Al 2 o 3 、TiO 2 , ZnO, AlF 3 Surface coating of ternary materials to improve material cycle performance and rate performance, the process is often complicated, and the influence of the coating on the performance of the electrode material is highly dependent on the performance of the coating itself

Method used

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  • Method for improving electrochemical performance of high-nickel ternary positive electrode material of lithium ion battery
  • Method for improving electrochemical performance of high-nickel ternary positive electrode material of lithium ion battery
  • Method for improving electrochemical performance of high-nickel ternary positive electrode material of lithium ion battery

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Embodiment 1

[0026] A modification method for improving the electrochemical performance of high-nickel ternary positive electrode materials for lithium-ion batteries, the specific steps are as follows

[0027] 1) Dissolve 0.1g of ammonium dihydrogen phosphate in deionized water, stir and dissolve at room temperature, the concentration of ammonium dihydrogen phosphate is 50mg / L;

[0028] 2) Add 0.5gNi 0.6 co 0.2 mn 0.2 (OH) 2 The precursors were placed in two containers respectively, and then 0.5ml and 1.5ml of the solution in step 1) were added respectively, and the solution was evaporated to dryness under magnetic stirring to obtain Ni 0.6 co 0.2 mn 0.2 (OH) 2 Precursor, the stirring speed is about 10rpm;

[0029] 3) 2) the resulting Ni with ammonium dihydrogen phosphate coating layer 0.6 co 0.2 mn 0.2 (OH) 2 The precursor was dried in a vacuum oven at 80°C for 3 hours;

[0030] 4) 3) Ni with ammonium dihydrogen phosphate coating layer after drying 0.6 co 0.2 mn 0.2 (OH) 2...

Embodiment 2

[0033] A modification method for improving the electrochemical performance of high-nickel ternary positive electrode materials for lithium-ion batteries, the specific steps are as follows

[0034] 1) Dissolve 0.1g of diammonium hydrogen phosphate in deionized water, stir and dissolve at room temperature, the concentration of diammonium hydrogen phosphate is 80mg / L;

[0035] 2) Add 0.5gNi 0.8 co 0.1 mn 0.1 (OH) 2 The precursors were placed in two containers respectively, and then 0.4ml and 1.0ml of the solution in step 1) were added respectively, and the solution was evaporated to dryness under magnetic stirring to obtain Ni 0.8 co 0.1 mn 0.1 (OH) 2 Precursor, the stirring speed is about 10rpm;

[0036] 3) 2) the resulting Ni with diammonium hydrogen phosphate coating 0.8 co 0.1 mn 0.1 (OH) 2 The precursor was dried in a vacuum oven at 80°C for 3 hours;

[0037] 4) Ni with diammonium hydrogen phosphate coating layer after 3) drying 0.8 co 0.1 mn 0.1 (OH) 2 The p...

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Abstract

The invention relates to a method for improving electrochemical performance of a high-nickel ternary positive electrode material of a lithium ion battery, and belongs to the preparation field of the lithium ion positive electrode material. Phosphate, used as a phosphate ion source, is mixed with a high-nickel ternary precursor in a liquid phase, and then the mixed material is dried in a vacuum drying oven to prepare the high-nickel ternary precursor with a phosphate coating layer on the surface; and next, the high-nickel ternary precursor with the phosphate coating layer and a lithium source are subjected to mixing and calcining. In the process of the high-nickel ternary precursor, a layer of compact Li<3>PO<4> is generated on the surface of the electrode material, and the high-nickel ternary material coated with Li<3>PO<4> on the surface is obtained through a one-step calcining method; compared with an un-coated material, the coated and modified electrode material can reach about 225mAh.g<-1> in initial cycle discharge specific capacity and 2.7-4.3V in charging cut-off voltage at 1C, 5C or 10C; and compared with the un-coated material, the discharge specific capacity of the coated and modified electrode material is improved, so that the rate capability of the high-nickel ternary positive electrode material is improved.

Description

technical field [0001] The invention relates to a method for improving the electrochemical performance of a high-nickel ternary positive electrode material for a lithium ion battery, in particular to a method for coating the surface of a high-nickel ternary positive electrode material with lithium phosphate, and belongs to the field of lithium ion positive electrode material preparation. Background technique [0002] In recent years, due to the long mileage requirements of new energy electric vehicle power batteries and the rapid replacement of electronic digital products, the current lithium batteries such as lithium iron phosphate can no longer meet the needs, and the development of higher performance lithium-ion batteries is imminent. Therefore, it is very important to improve the electrochemical performance of positive and negative electrode materials for lithium-ion batteries. [0003] High-nickel ternary cathode materials have received widespread attention, because nic...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/58H01M4/525H01M4/505H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/5825H01M10/0525Y02E60/10
Inventor 穆道斌陈实赵志坤吴伯荣丁银姜颖丁泽鹏马瑞
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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