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Lithium ion battery cathode material and preparation method

A technology for lithium-ion batteries and positive electrode materials, applied in the field of lithium-ion battery positive electrode materials and their preparation

Active Publication Date: 2021-03-16
邵武永太高新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the surface coating materials disclosed in the above-mentioned prior art about surface coating still need to be further improved in terms of improving the high temperature performance of the battery and improving the lithium ion migration ability

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0034]0.03 g of nine nitrate aluminum, 0.0165 g of lithium nitrate and 0.0211 g of sodium hydrogen phosphate were pre-dissolved in 30 ml of water, and then stirred for about 1 hour (the purpose of stirring was mixed), 1 g of lithium cobaltate was mixed, stirred 2 The hour (stirred was mixed), water was mixed at 160 ° C for 5 hours, and then dried in an oven at 80 ° C for 8 hours after centrifugation, then heated at 700 ° C in argon for 5 hours, heating speed 5 ° C min MIN-1After natural cooling, lithium cobaltate material is obtained.

[0035]Among them, aluminum salt (aluminum nitrate nitrate nitrate) and lithium molar ratio of cobaltate: 0.00783: 1, lithium salt (lithium nitrate) and lithium molar ratio of cobaltate: 0.0234: 1, phosphate and cobalt acid lithium molar ratio: 0.0156 : 1.

Embodiment 2

[0037]0.0417 g of nine nine nitrate aluminum, 0.0116 g of lithium nitrate and 0.0220 g of sodium hydrogen phosphate were pre-dissolved in 30 ml of water, stirred for about 1 hour, mixing 1 g of lithium cobaltate was mixed, stirred for 2 hours, water at 160 ° C After 5 hours, it was dried in an oven at 80 ° C for 8 hours after centrifugation, and then heated at 700 ° C in argon for 5 hours, and the temperature increased speed of 5 ° C min.-1After natural cooling, lithium cobaltate material is obtained.

[0038]Among them, aluminum salt (aluminum nitrate nitrate nitrate) and lithium molar ratio of cobaltate: 0.0109: 1, lithium salt (lithium nitrate) and lithium molar ratio of cobalt acid: 0.0165: 1, phosphate ammonium hydrogen phosphate and cobalt molar ratio: 0.0163 : 1.

Embodiment 3

[0040]0.0467 g of nine nine nitrate aluminum, 0.0086 g of nitrate and 0.0219 g of sodium hydrogen phosphate were pre-dissolved in 30 ml of water, and then 1 g of lithium cobaltate was mixed, stirred for 2 hours, water at 160 ° C for water After 5 hours, it was dried in an oven at 80 ° C for 8 hours after centrifugation, and then heated at 700 ° C in argon for 5 hours, and the temperature increased speed of 5 ° C min.-1After natural cooling, lithium cobaltate material is obtained.

[0041]Among them, aluminum salts (aluminum nitrate nitrate nitrate) and lithium molar ratios: 0.0122: 1, lithium salt (lithium nitrate) and lithium molar ratios: 0.0122: 1, phosphate and cobalt-cobalt molar ratio: 0.0162 :1.

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Abstract

The invention discloses a lithium ion battery positive electrode material and a preparation method thereof. The preparation method comprises the following steps: (1) providing a phosphate radical source, an aluminum ion source, a lithium ion source and lithium cobalt oxide; (2) dissolving a phosphate radical source, an aluminum ion source and a lithium ion source in water, then adding lithium cobalt oxide, mixing, carrying out hydrothermal reaction precipitation after mixing, separating the precipitation, and drying to obtain a mixed powder material; and (3) carrying out heating treatment on the mixed powder material obtained in the step (2) in an atmosphere protection environment at the temperature of 700-1000 DEG C for 58 hours to obtain modified lithium cobalt oxide, namely the lithiumion battery positive electrode material. According to the preparation method, a composite compound is efficiently and controllably introduced into the surface of lithium cobalt oxide in situ by utilizing an interface reaction, molecular-level surface modification is realized, active oxygen in crystal lattices on the surface of lithium cobalt oxide is stabilized by utilizing a phosphorus element, and long-acting stable circulation of the lithium cobalt oxide positive electrode material under 4.6 V or even 4.7 V high voltage is realized.

Description

Technical field[0001]The present invention relates to the field of lithium ion batteries, and more particularly to a lithium ion battery positive electrode material and a preparation method.Background technique[0002]Fast development has put forward higher demand in terms of energy density, cycle life, and power density. Compared with other commercial secondary charge and discharge batteries, lithium-ion batteries have high energy density and power density, Gao Kurun efficiency, environmentally friendly and no memory effects, etc., are widely used in consumer electronics, electric vehicles, Medical electronic equipment, aerospace and power grids and other fields. The positive electrode material often occupies more than half of the weight of the battery, and is a decisive component of lithium ion battery performance. For the increase in energy density, in recent years, the method of increasing the active substance is gradually proximate the limit, according to the energy density = vol...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/525H01M4/58H01M10/0525
CPCH01M4/366H01M4/525H01M4/5825H01M10/0525H01M2004/028Y02E60/10
Inventor 陆盈盈王潇武倩
Owner 邵武永太高新材料有限公司
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