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A kind of double metal oxide coated fluorine-doped ternary positive electrode material and preparation method thereof

A bimetallic oxide and cathode material technology, applied in electrical components, battery electrodes, electrochemical generators, etc., can solve problems that affect battery performance and cannot maintain structural integrity for a long time, and achieve enhanced interface stability and capacity And capacity retention rate improvement, the effect of improving flexibility

Active Publication Date: 2020-07-17
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In addition, with the continuous deepening of research on lithium-ion batteries, more researchers pay attention to the electrochemical reaction in a specific system. The presence of trace water in the electrolyte system with LiPF6 as the electrolyte salt cannot be avoided, resulting in the decomposition of LiPF6 salt to produce HF , the active material in this acidic environment is acidified, that is, it cannot maintain structural integrity for a long time, and it also causes the material to release oxygen, thereby affecting the overall performance of the battery

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  • A kind of double metal oxide coated fluorine-doped ternary positive electrode material and preparation method thereof

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Embodiment 1

[0037] A kind of bimetallic oxide coated fluorine-doped ternary positive electrode material that the present invention proposes, its general chemical formula is Li1.05 Ni 0.595 co 0.201 mn 0.200 m 0.002 f 0.02 o 1.98 ; It includes a three-layer structure, which is respectively an inner core phase layer containing ternary lithium nickel cobalt manganese oxide, a surface doping layer containing doping element F, and a TiMgO 3 A surface coating layer of oxide; wherein, the surface doping layer covers the surface of the inner core phase layer, and the surface coating layer covers the surface of the surface doping layer.

[0038] The present invention also proposes a method for preparing a double-metal oxide-coated fluorine-doped ternary positive electrode material, which is characterized in that it comprises the following steps:

[0039] S1. Preparation of ternary nickel-cobalt-manganese oxide precursor material: Mix nickel sulfate solution, cobalt sulfate solution, and manga...

Embodiment 2

[0045] A kind of bimetallic oxide coated fluorine-doped ternary positive electrode material that the present invention proposes, its general chemical formula is Li 1.05 Ni 0.595 co 0.202 mn 0.201 m 0.001 f 0.02 o 1.98 ; It includes a three-layer structure, which is respectively an inner core phase layer containing ternary lithium nickel cobalt manganese oxide, a surface doping layer containing doping element F, and a TiMgO 3 A surface coating layer of oxide; wherein, the surface doping layer covers the surface of the inner core phase layer, and the surface coating layer covers the surface of the surface doping layer.

[0046] During the preparation process, the difference from Example 1 is that in S4, the molar ratio between magnesium isopropoxide, tetrabutyl titanate, and the preliminary lithiated fluorine-doped nickel-cobalt-manganese ternary material is 0.1:0.1:100 , modification temperature and time are constant; other conditions such as other raw materials, reaction...

Embodiment 3

[0048] A kind of bimetallic oxide coated fluorine-doped ternary positive electrode material that the present invention proposes, its general chemical formula is Li 1.05 Ni 0.591 co 0.202 mn 0.201 m 0.003 f 0.02 o 1.98 ; It includes a three-layer structure, which is respectively an inner core phase layer containing ternary lithium nickel cobalt manganese oxide, a surface doping layer containing doping element F, and a TiMgO 3 A surface coating layer of oxide; wherein, the surface doping layer covers the surface of the inner core phase layer, and the surface coating layer covers the surface of the surface doping layer.

[0049] During the preparation process, the difference from Example 1 is that in S4, the molar ratio between magnesium isopropoxide, tetrabutyl titanate, and the preliminary lithiated fluorine-doped nickel-cobalt-manganese ternary material is 0.3:0.3:100 , modification temperature and time are constant; other conditions such as other raw materials, reaction...

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Abstract

The invention discloses a bimetallic oxide coated fluorine-doped ternary positive electrode material and a preparation method thereof. The bimetallic oxide coated fluorine-doped ternary positive electrode material adopts a chemical general formula of LixNiaCobMncMyFzO2-z, and adopts a three-layer structure, namely a core phase layer containing ternary lithium nickel cobalt manganese oxide, a surface doping layer containing a doping element F and a surface coating layer containing TiMgO3 oxide respectively, wherein the surface of the core phase layer is coated with the surface doping layer, andthe surface of the surface doping layer is coated with the surface coating layer. According to the bimetallic oxide coated fluorine-doped ternary positive electrode material and the preparation method thereof, provided by the invention, the obtained positive electrode material has a stable structure and the cycle performance and the high temperature storage performance of a battery are effectively improved.

Description

technical field [0001] The invention relates to the technical field of battery materials, in particular to a double-metal oxide-coated fluorine-doped ternary positive electrode material and a preparation method thereof. Background technique [0002] With the advantages of high energy and power density, long cycle life, etc., rechargeable lithium-ion batteries can be used in portable electronic devices, electric vehicles and hybrid electric vehicles, etc. In terms of crystal structure, the cathode materials of lithium-ion batteries are layered structure, spinel structure, olivine structure and composite structure. Among many positive electrode materials, due to the advantages of high discharge voltage, high specific energy, high specific power and long life, positive electrode materials represented by LiCoO2, LiNi1 / 3Co1 / 3Mn1 / 3O2, LiMn2O4 and LiFePO4 are the first to be mass-produced, and Successfully carried out industrialized mass production. In particular, Li[NixCoyMn1-x-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/626H01M4/628H01M10/0525Y02E60/10
Inventor 史俊李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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