Metal oxide modified positive electrode material and preparation method thereof, lithium battery and electric equipment

A positive electrode material and oxide technology, which is applied in the direction of battery electrodes, positive electrodes, secondary batteries, etc., can solve the problems of capacity fading, poor cycle performance, and inability to carry out industrial and commercial applications, so as to reduce the preparation cost and be easy to operate , Promote the effect of industrialization and commercial application

Pending Publication Date: 2021-11-30
GUANGZHOU GREAT POWER ENERGY & TECH CO LTD +1
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] One of the purposes of the present invention is to provide a metal oxide modified positive electrode material to improve the existing spinel LiNi 0.5 mn 1.5 o 4 Side reactions with the electrolyte lead to poor cycle performance and severe capacity fading under high temperature and high rate conditions, making it impossible for industrial and commercial applications to be technically problematic

Method used

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  • Metal oxide modified positive electrode material and preparation method thereof, lithium battery and electric equipment
  • Metal oxide modified positive electrode material and preparation method thereof, lithium battery and electric equipment
  • Metal oxide modified positive electrode material and preparation method thereof, lithium battery and electric equipment

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preparation example Construction

[0078] According to a second aspect of the present invention, the present invention provides a method for preparing a metal oxide modified positive electrode material, comprising the following steps:

[0079] Disperse the metal oxide in the solvent evenly, then add the positive electrode material and mix evenly, then remove the solvent and sinter to obtain the metal oxide modified positive electrode material, wherein the positive electrode material includes one of lithium nickel manganese oxide and lithium nickel chromium manganate or two.

[0080] In the present invention, the metal oxide modified positive electrode material is prepared by the improved solid phase method of mixing the metal oxide with the positive electrode material evenly and then sintering, which is not only simple in process, easy to operate, suitable for large-scale production, but also can effectively save energy consumption. Reduce Mn 3+ The production cost is reduced at the same time.

[0081] Prefer...

Embodiment 1

[0106] This embodiment provides an Al 2 o 3 Modified lithium nickel chromium manganate (LiNi 0.45 Cr 0.1 mn 1.45 o 4 Hereinafter referred to as the preparation method of LNCMO), prepare according to the following steps:

[0107] (1) Preparation of LNCMO cathode material

[0108] (1.1) Add polyvinylpyrrolidone to absolute ethanol to prepare an absolute ethanol solution in which polyvinylpyrrolidone is dissolved, wherein the mass volume ratio of polyvinylpyrrolidone to absolute ethanol is 2g:1000mL;

[0109] (1.2) will Li 2 CO 3 0.5315g, LiOH0.3442g, NiO0.9209g, Cr 2 o 3 0.2082g and MnO 2 3. Put 4541 g in a ball mill jar, add dropwise into the absolute ethanol solution dissolved with polyvinylpyrrolidone until the solution is submerged in the material, ball mill for 5 hours, and then dry to remove the absolute ethanol to obtain the dried material;

[0110] (1.3) Put the dried material in a muffle furnace, raise the temperature to 800°C at a rate of 5°C / min and keep it...

Embodiment 2

[0116] This embodiment provides an Al 2 o 3 Modified lithium nickel chromium manganate (LiNi 0.45 Cr 0.1 mn 1.45 o 4 Hereafter abbreviated as the preparation method of LNCMO), it differs from Example 1 in that in step (2), Al 2 o 3 The consumption is 1g, and all the other steps are identical with embodiment 1, do not repeat them here.

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Abstract

The invention provides a metal oxide modified positive electrode material and a preparation method thereof, a lithium battery and electric equipment, which relate to the technical field of positive electrode materials. The metal oxide modified positive electrode material comprises a positive electrode material, the outer surface of the positive electrode material is modified with a metal oxide, the positive electrode material comprises at least one of nickel lithium manganate and nickel chromium lithium manganate. The surface of the positive electrode material is modified by adopting the metal oxide, so that the positive electrode material can be effectively prevented from being in direct contact with an electrolyte, side reaction is inhibited, the positive electrode material is protected from being soaked and etched by the electrolyte, and the cycling stability and the capacity stability under high-temperature and high-rate conditions are improved; and industrial and commercial application of spinel and other positive electrode materials is promoted.

Description

technical field [0001] The invention relates to the technical field of positive electrode materials, in particular to a metal oxide modified positive electrode material and a preparation method, a lithium battery and electrical equipment. Background technique [0002] In today's life, energy issues have always been a matter of concern to people. Coal, oil, and natural gas are still the energy sources that people use more, but these are all primary energy sources, non-renewable energy sources, and will eventually be eliminated by humans. The new energy sources that people are exploring at the present stage include solar energy, wind energy, tidal energy, etc. This type of energy has the advantages of environmental protection and regeneration, but this type of energy cannot be continuously used in time and space. At present, the more mature energy storage devices are lithium-ion batteries. This type of battery has the advantages of high working voltage, high energy density, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M10/0525H01M2004/028Y02E60/10
Inventor 刘国强罗熳蒋文全孙宏达薛建军
Owner GUANGZHOU GREAT POWER ENERGY & TECH CO LTD
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