High-capacity lithium cobalt oxide-base lithium ion battery anode material and preparation method thereof

A cathode material, ion battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of affecting battery cycle performance, poor crystallinity of lithium cobalt oxide, hidden dangers of battery safety, etc., and achieve excellent high temperature cycle performance. The effect of high capacity and good de-embedding performance

Inactive Publication Date: 2014-03-26
NANTONG RESHINE NEW MATERIAL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] There are other ways to increase the capacity of lithium-ion secondary batteries: (a) Chinese patent CN 1665052A increases the compaction density of the material by mixing lithium cobalt oxides of different particle sizes, thereby increasing the capacity per unit volume to achieve high capacity, Due to its small particle size, it brings potential safety hazards to the battery; (b) Chinese patent CN 101436666A proposes to prepare large particles of lithium cobalt oxide material first, and then use cobalt carbonate and lithium carbonate to form large lithium cobalt oxide particles on the surface. particles,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) To prepare large particle size lithium cobalt oxide material A, mix cobalt carbonate (D50 is 16 μm), lithium carbonate, dopant magnesium oxide and zirconium oxide in a certain proportion, wherein the molar ratio of Li and Co is 1.10, The dosage of dopant magnesia was 1.5 wt%, and that of dopant zirconium oxide was 2.5 wt%. The main temperature of sintering was 1050℃, and the sintering time in the main temperature zone was 22 h. The whole sintering process was carried out under air atmosphere carried out, the ventilation volume control range is 15 m 3 / h, the sintered material is crushed, pulverized, classified, sieved and other processes to obtain large particle size lithium cobaltate A, D50 is 20 μm.

[0024] (2) Prepare small particle size lithium cobalt oxide material B, mix cobalt carbonate (D50 is 2 μm), lithium carbonate, dopant magnesia and zirconia according to a certain ratio, wherein the molar ratio of Li and Co is 1.10, The dopant magnesium oxide content...

Embodiment 2

[0029] (1) To prepare large particle size lithium cobalt oxide material A, mix cobalt carbonate (D50 is 20 μm), lithium carbonate, dopant magnesium oxide and zirconium oxide in a certain proportion, wherein the molar ratio of Li and Co is 1.10, The dosage of dopant magnesia was 1.5 wt%, and that of dopant zirconium oxide was 2.5 wt%. The main temperature of sintering was 1050℃, and the sintering time in the main temperature zone was 22 h. The whole sintering process was carried out under air atmosphere carried out, the ventilation volume control range is 15 m 3 / h, the sintered material was crushed, pulverized, classified, sieved and other processes to obtain large particle size lithium cobaltate A, D50 was 22 μm.

[0030] (2) Prepare small particle size lithium cobalt oxide material B, mix cobalt carbonate (D50 is 2 μm), lithium carbonate, dopant magnesia and zirconia according to a certain ratio, wherein the molar ratio of Li and Co is 1.10, The dopant magnesium oxide conte...

Embodiment 3

[0035] (1) To prepare large particle size lithium cobaltate material A, mix cobalt carbonate (D50 is 7 μm), lithium carbonate, and dopant magnesium oxide in a certain proportion, wherein the molar ratio of Li and Co is 0.95, and the dopant The content of magnesium oxide is 0.01 wt%, the main sintering temperature is controlled at 1350 °C, and the sintering time in the main temperature zone is 5 h. 3 / h, the sintered material is crushed, pulverized, classified, sieved and other processes to obtain the required semi-finished product A of lithium cobaltate, with a D50 of 10 μm.

[0036] (2) Coat material A, the coating material is alumina, the dosage is 0.01 wt%, and the coating method used is wet coating. The solvent used for wet coating is isopropanol.

[0037] (3) Sinter the lithium cobalt oxide semi-finished product obtained in step (4). The main temperature of the sintering is controlled at 400°C, and the sintering time of the main temperature is 36 h. 30m 3 / h, the sinte...

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Abstract

The invention discloses a high-capacity lithium cobalt oxide-base lithium ion battery anode material. The material is a lithium cobalt oxide finished product which is obtained by mixing modified lithium cobalt oxide in different granularities and coating the lithium cobalt oxide, the anode material contains a cobalt-source substance, a lithium-source substance, a doping agent and a coating material, wherein the molar ratio of Li to Co is 0.95 to 1.2, the doping quantity of the doping agent is 0.01 to 10 percent by weight, and the doping quantity of the coating material is 0.01 to 20 percent by weight. The capacity of the lithium cobalt oxide material is improved by mixing the lithium cobalt oxide in different granularities, the stability, safety and electrochemical property of the material under the high voltage condition of more than 4.2V are improved through doping and coating, and the high-temperature circulating property is improved.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and its preparation, in particular to a high-capacity lithium cobaltate-based lithium ion battery cathode material and a preparation method thereof. Background technique [0002] With the rapid development of electronic technology and the continuous upgrading of electronic products, the requirements for the energy density of batteries are also getting higher and higher. At present, the charging voltage of the conventionally used small lithium-ion battery is 4.2V. The smart high-end electronic products represented by the American Apple Company and the South Korean Samsung Company have updated the batteries used in their own products to increase the battery voltage to 4.3V. , 4.35V or higher high-voltage batteries. Increasing the charging voltage of the battery can significantly increase the capacity of the battery without increasing the active material in the battery. It is one of the effe...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M4/62
CPCY02E60/122H01M4/366H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 李兴翠池田一崇尹雄鸽王文博高林周贵海
Owner NANTONG RESHINE NEW MATERIAL
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