A lithium cobalt oxide positive electrode material for lithium ion batteries above 4.45V and preparation method thereof

A battery lithium cobalt oxide and positive electrode material technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve problems such as the impact of positive electrode material capacity, and achieve the effects of improving electrochemical performance, easy steps, and simple steps

Active Publication Date: 2021-08-31
HUNAN SHANSHAN ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above technical means can achieve the technical effect of improving structural stability and improving material cycle performance, purely inert substances and LiVPO without capacity activity 4 F coating will inevitably block lithium ions from coming out and intercalating during charging and discharging, which will affect the capacity of the positive electrode material itself.

Method used

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  • A lithium cobalt oxide positive electrode material for lithium ion batteries above 4.45V and preparation method thereof
  • A lithium cobalt oxide positive electrode material for lithium ion batteries above 4.45V and preparation method thereof
  • A lithium cobalt oxide positive electrode material for lithium ion batteries above 4.45V and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0038] A kind of 4.45V lithium ion battery lithium cobaltate cathode material of the present invention, comprises cobaltate lithium substrate and the coating layer that is coated on substrate surface, and cobaltate lithium substrate is the lithium cobaltate of doping Mg, Ti, Al ( Molecular formula is Li 1.05 co 0.997 Mg 0.001 Ti 0.001 al 0.001 o 2 ), the cladding layer is lithium cobalt oxide doped with elements Y and Ti, and its molecular formula is Li 0.60 co 0.97 Y 0.02 Ti 0.01 o 2 .

[0039] The preparation method of lithium cobalt oxide cathode material above 4.45V of the present invention comprises the following steps:

[0040] (1) Will Li 2 CO 3 、Co 3 o 4 (Spherical regular structure, D 50 =16.0~17.0μm), MgO, TiO 2 、Al 2 o 3 According to the molar ratio of Li, Co, Mg, Ti and Al elements of 1.05: 0.997: 0.001: 0.001: 0.001, fully mix in a high-speed mixer, and then carry out high-temperature solid-state sintering at 1070 ° C for 12 hours, Then the sint...

Embodiment 2

[0048] A kind of 4.45V lithium ion battery lithium cobaltate cathode material of the present invention, comprise cobaltate lithium substrate and the covering layer that is coated on substrate surface, cobaltate lithium substrate is the lithium cobaltate of doping Mg, Ti, Al ( Molecular formula is Li 1.07 co 0.995 Mg 0.0015 Ti 0.0015 al 0.002 o 2 ), the cladding layer is lithium cobalt oxide doped with elements Sn and Nb, and its molecular formula is Li 0.55 co 0.96 sn 0.02 Nb 0.02 o 2 .

[0049] The preparation method of lithium cobalt oxide cathode material above 4.45V of the present invention comprises the following steps:

[0050] (1) LiOH, Co(OH) 2 (spherical structure, D 50 =16.0~17.0μm), MgO, TiO 2 、Al 2 o 3 According to the molar ratio of Li, Co, Mg, Ti and Al elements of 1.07: 0.995: 0.0015: 0.0015: 0.002, fully mixed in a high-speed mixer, and then sintered at 1050 ° C for 20 hours at high temperature, and then The sintered product is pulverized to obt...

Embodiment 3

[0057] A kind of 4.45V lithium ion battery lithium cobaltate cathode material of the present invention, comprises cobaltate lithium substrate and the coating layer that is coated on substrate surface, and cobaltate lithium substrate is the lithium cobaltate of doping Mg, Ti, Al ( Molecular formula is Li 1.1 co 0.994 Mg 0.002 Ti 0.002 al 0.003 o 2 ), the cladding layer is lithium cobalt oxide doped with elements Mn and Nb, and its molecular formula is Li 0.60 co 0.98 mn 0.01 Nb 0.01 o 2 .

[0058] The preparation method of lithium cobalt oxide cathode material above 4.45V of the present invention comprises the following steps:

[0059] (1) LiNO 3 、Co 3 o 4 (Spherical regular structure, D 50 =16.0~17.0μm), MgO, TiO 2 、Al 2 o 3 According to the molar ratio of Li, Co, Mg, Ti and Al elements of 1.1: 0.994: 0.002: 0.001: 0.003, they were fully mixed in a high-speed mixer, and then sintered at 1030 ° C for 8 h at high temperature, and then The sintered product is pu...

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Abstract

The invention discloses a lithium cobalt oxide cathode material for a lithium ion battery above 4.45V, comprising a lithium cobalt oxide matrix (lithium cobalt oxide doped with Mg, Ti, Al) and a cladding layer (doping element M, N lithium cobalt oxide). Preparation method of the present invention: (1) Li source, Co source, MgO, TiO 2 and Al 2 o 3 Mix evenly, then sinter, and airflow pulverize the sintered product to obtain the matrix lithium cobaltate; (2) mix the matrix lithium cobaltate, CoCO containing doped metal elements M and N 3 and Li source are mixed evenly, and then sintered at constant temperature for the second time, and sieved to obtain the lithium cobaltate positive electrode material. The lithium cobaltate positive electrode material of the present invention is assembled into a full battery, tested at 25°C, the first discharge capacity of 4.5V is not less than 191mAh / g, and the efficiency is not lower than 92.0%; tested at 45°C, cycled at 4.48V The capacity retention rate for 500 cycles is not lower than 80.0%, and the capacity retention rate for 350 cycles at 4.5V is not lower than 80.0%.

Description

technical field [0001] The invention belongs to the field of lithium ion battery materials, and in particular relates to a lithium cobalt oxide positive electrode material for a lithium ion battery above 4.45V and a preparation method thereof. Background technique [0002] With the continuous development of lithium-ion battery technology, the battery system puts forward higher requirements for the four major components, namely, positive electrode material, negative electrode material, separator and electrolyte, and gradually moves from low-end to high-end. At present, lithium-ion batteries are mainly divided into two categories: 3C digital and power, because lithium cobalt oxide material has excellent energy density, cycle performance and high and low temperature performance, and is an irreplaceable positive electrode material in 3C digital lithium-ion batteries. Since the mass production of 4.45V lithium cobaltate has been realized, it can basically meet the needs of more t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/525H01M10/0525
CPCH01M4/366H01M4/525H01M10/0525Y02E60/10
Inventor 胡旭尧石慧董虹蒋湘康李永昌
Owner HUNAN SHANSHAN ENERGY TECH CO LTD
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