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Modified spinel type positive electrode material, preparation method thereof and lithium ion battery positive plate

A lithium-ion battery, spinel-type technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as crystal structure changes, prone to disproportionation reactions, and reduced battery charge-discharge performance, and achieves inhibition of transformation, The effect of reducing the Jahn-Teller effect and suppressing the degradation of the crystal structure

Pending Publication Date: 2022-03-01
ENVISION DYNAMICS TECH (JIANGSU) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the charging and discharging process, due to the Jahn-Teller effect of the trivalent Mn element, disproportionation reactions are prone to occur, resulting in drastic changes in the crystal structure and greatly reducing the charging and discharging performance of the battery.

Method used

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  • Modified spinel type positive electrode material, preparation method thereof and lithium ion battery positive plate
  • Modified spinel type positive electrode material, preparation method thereof and lithium ion battery positive plate

Examples

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Embodiment 1

[0038] This embodiment provides a modified spinel-type positive electrode material, in which the modified spinel-type positive electrode material is doped with metal oxide TiO, TiO and lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.5:99.5; the modified spinel-type positive electrode material is a secondary spherical shape, D 50 The particle size is 30 μm.

[0039] The preparation method of the modified spinel type positive electrode material comprises the following steps:

[0040] Mixed lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 with Ti(CH 3 COO) 2 , get the dopant; with 2.5Nm 3 Nitrogen gas was introduced at a flow rate of / h, and the obtained dopant was sintered for 24 hours at a temperature of 600° C. to obtain the modified spinel-type positive electrode material.

Embodiment 2

[0042] This embodiment provides a modified spinel-type positive electrode material, in which the modified spinel-type positive electrode material is doped with metal oxide MO x , the metal oxide MO x Composed of MgO and NiO with a mass ratio of 8:2, the metal oxide MO x LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.2:99.8, the modified spinel positive electrode material is a secondary spherical shape, D 50 The particle size is 20 μm.

[0043] The preparation method of the modified spinel type positive electrode material comprises the following steps:

[0044] Mixed lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 , MgO and NiO to obtain the dopant; the flow rate is 3Nm 3 / h of helium, and the obtained dopant was sintered at a temperature of 500° C. for 32 hours to obtain the modified spinel positive electrode material.

Embodiment 3

[0046] This embodiment provides a modified spinel-type positive electrode material, in which the modified spinel-type positive electrode material is doped with metal oxide MO x , the metal oxide MO x Composed of BaO and SrO with a mass ratio of 3:7, the metal oxide MO x LiNi 0.5 mn 1.5 o 4 The mass ratio of 0.8:99.2, the modified spinel positive electrode material is a secondary spherical shape, D 50 The particle size is 45 μm.

[0047] The preparation method of the modified spinel type positive electrode material comprises the following steps:

[0048] Mixed lithium nickel manganese oxide LiNi 0.5 mn 1.5 o 4 , BaO and SrO to obtain dopant; the flow rate is 4Nm 3 / h of argon, and the obtained dopant was sintered at a temperature of 700° C. for 16 hours to obtain the modified spinel positive electrode material.

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Abstract

The invention provides a modified spinel type positive electrode material, the modified spinel type positive electrode material comprises lithium nickel manganese oxide and doped metal oxide MOx, and the mass ratio of the metal oxide MOx to the lithium nickel manganese oxide is (0.01-1): (99.99-99); m in the metal oxide MOx is in a valence state less than bivalent. According to the modified spinel-type positive electrode material provided by the invention, by doping the low-valence metal oxide, dissolution of manganese or crystal structure degradation in the cycle process is effectively inhibited, and the cycle stability of a battery material system is improved; according to the preparation method of the modified spinel type positive electrode material, a low-valence metal oxide precursor is added and co-sintered with lithium nickel manganese oxide, so that conversion from tetravalent manganese to trivalent manganese in a synthesis process is inhibited, the stability of a prepared crystal structure is improved, and the stability of a battery system is further improved.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and relates to a modified spinel positive electrode material, in particular to a modified spinel positive electrode material, a preparation method thereof and a lithium ion battery positive electrode sheet. Background technique [0002] Spinel lithium nickel manganese oxide has a high reaction potential (>4.6V) and a high theoretical specific capacity (>140mAh / g), and is applied to a power battery system with high energy density. However, during the charge and discharge process, due to the Jahn-Teller effect of the trivalent Mn element, disproportionation reactions are prone to occur, resulting in drastic changes in the crystal structure and greatly reducing the charge and discharge performance of the battery. The improvement of the battery system for this material is mostly focused on the improvement of the electrolyte, and there is still much room for improvement of the mate...

Claims

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Application Information

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IPC IPC(8): C01G53/00H01M4/505H01M4/525H01M10/0525
CPCC01G53/54H01M4/505H01M4/525H01M10/0525H01M2004/028C01P2004/61C01P2002/52C01P2006/40C01P2002/32Y02E60/10
Inventor 莫方杰孙化雨
Owner ENVISION DYNAMICS TECH (JIANGSU) CO LTD
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