High-voltage lithium cobaltate positive electrode material and preparation method thereof, and lithium ion battery

A positive electrode material, lithium cobalt oxide technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as dislocation, specific capacity and cycle performance deterioration, material structure distortion, etc., achieve high cycle stability, improve cycle Stability, the effect of slowing down the dissolution of cobalt

Active Publication Date: 2019-05-21
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the embodiment of the present invention provides a high-voltage lithium cobaltate positive electrode material, which has a high specific capacity and good cycle stability at a working voltage of 2.5V-4.8V, to solve the p...

Method used

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  • High-voltage lithium cobaltate positive electrode material and preparation method thereof, and lithium ion battery
  • High-voltage lithium cobaltate positive electrode material and preparation method thereof, and lithium ion battery
  • High-voltage lithium cobaltate positive electrode material and preparation method thereof, and lithium ion battery

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preparation example Construction

[0059] Correspondingly, an embodiment of the present invention also provides a method for preparing a high-voltage lithium cobalt oxide positive electrode material, comprising the following steps:

[0060] S101, taking lithium source, cobalt source and a compound containing doping element Ma to prepare a mixture; said doping element Ma is selected from one of the elements with an ion radius range of 68pm-90pm, and an ion valence state ≥ 1 or various;

[0061] S102, sintering the mixture at 800°C-1100°C for 6-24 hours to obtain a crude product, and crushing the crude product to obtain lithium cobaltate doped with lithium substitution, that is, high-voltage cobaltate Lithium cathode material, the general formula of the lithium cobalt oxide doped by the substitution of lithium is: Li 1-x Ma x CoO 2 , wherein, 0

Embodiment 1

[0071] A method for preparing a high-voltage lithium cobalt oxide positive electrode material, comprising the following steps:

[0072] (1) Preparation of Lithium Cobalt Oxide Lithium Substituted and Doped 0.95 Ni 0.05 COO 2

[0073] Take Li respectively 2 CO 3 ,Co 3 o 4 and Ni(OH) 2 , according to the molar ratio of lithium, cobalt and nickel 1.06:1:0.05, stir and mix evenly, place in a muffle furnace or sintering furnace for temperature sintering, keep it at 1050°C for 12h, collect the product after natural cooling, and carry out crushing collected to obtain nickel-doped lithium cobaltate Li 0.95 Ni 0.05 COO 2 One grain.

[0074] (2) with Li 0.95 Ni 0.05 COO 2 Preparation of High Voltage Lithium Cobalt Oxide Cathode Material with Primary Particles as Core

[0075] Get the nickel-doped lithium cobaltate Li prepared by step (1) 0.95 Ni 0.05 COO 2 20g, then soaked with ethanol and tiled onto a glass slide, and Li was deposited by atomic layer vapor deposition...

Embodiment 2

[0079] A method for preparing a high-voltage lithium cobalt oxide positive electrode material, comprising the following steps:

[0080] (1) Preparation of Lithium Cobalt Oxide Lithium Substituted and Doped 0.95 Mg 0.05 COO 2

[0081] Take Li respectively 2 CO 3 ,Co 3 o 4 and Mg(OH) 2 According to the molar ratio of lithium, cobalt and magnesium 1.06:1:0.05, feed materials, stir and mix evenly, place in muffle furnace or sintering furnace for temperature sintering, keep warm at 1050°C for 12 hours, collect products after natural cooling, and crush them collected to obtain magnesium-doped lithium cobaltate Li 0.95 Mg 0.05 COO 2 One grain.

[0082] (2) with Li 0.95 Mg 0.05 COO 2 Preparation of High Voltage Lithium Cobalt Oxide Cathode Material with Primary Particles as Core

[0083] Get the Mg-doped lithium cobaltate Li prepared by step (1) 0.95 Mg 0.05 COO 2 20g and nanoscale La 2 o 3 1g, mixed evenly by mechanical fusion method, placed in a muffle furnace ...

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Abstract

Embodiments of the present invention provide a high voltage lithium cobaltate positive cathode material, including a lithium cobaltate substituted and doped at lithium positions. The lithium cobaltatesubstituted and doped at lithium positions has a general formula of Li1-xMaxCoO2, where x is greater than 0 and less than or equal to 0.05, Ma is a doping element, Ma is selected from one or more ofelements having an ionic radius ranging from 68 pm to 90 pm and an ion valence state greater than or equal to 1. The high-voltage lithium cobaltate positive electrode material is formed by substituting and doping lithium cobaltate at lithium positions, and the electrostatic interaction and cobalt dissolution of lithium cobaltate caused by lithium de-intercalation at a high voltage is alleviated, so that the structure and cycle stability of the material is improved, and the material has a high capacity and good cycle stability at the high voltage. Embodiments of the present invention further provide a high-voltage lithium cobaltate positive electrode material preparation method and a lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of lithium ion batteries, in particular to a high-voltage lithium cobalt oxide positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] Due to the advantages of high power density and energy density, small size, and long life, lithium-ion batteries are widely used in consumer electronics, mobile terminals, communication energy storage, and electric vehicles. Lithium-ion batteries are mainly composed of positive electrodes, negative electrodes, diaphragms, and electrolytes. Commonly used lithium-ion battery positive electrode materials include lithium cobaltate, lithium manganate, nickel-cobalt lithium manganate, and lithium iron phosphate. In the past two years, due to the rapid development of "Internet +" and mobile terminals (such as smart phones, drones, household robots, etc.), people's demand for battery life has become higher and higher. Theref...

Claims

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Application Information

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IPC IPC(8): H01M4/525H01M10/0525
CPCH01M4/525H01M10/0525Y02E60/10
Inventor 李政杰雷丹王平华李阳兴
Owner HUAWEI TECH CO LTD
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