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Spinel type lithium ion battery cathode active material and preparation method thereof

A positive electrode active material, lithium-ion battery technology, applied in battery electrodes, positive electrodes, secondary batteries, etc., can solve problems such as poor cycle performance, and achieve high utilization rate, excellent long cycle performance and fast charge/discharge performance Effect

Active Publication Date: 2020-10-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a positive active material of a spinel lithium ion battery and a preparation method thereof, which are used to overcome LiNi in the prior art 0.5 mn 1.5 o 4 Defects such as poor cycle performance at higher current densities

Method used

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  • Spinel type lithium ion battery cathode active material and preparation method thereof
  • Spinel type lithium ion battery cathode active material and preparation method thereof
  • Spinel type lithium ion battery cathode active material and preparation method thereof

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preparation example Construction

[0032] The present invention also proposes a preparation method of a positive electrode active material of a spinel lithium ion battery, the preparation method comprising:

[0033] S1: dissolving hexamethylenetetramine in a mixed solvent; the mixed solvent consists of diethylene glycol and deionized water;

[0034] S2: adding manganese acetate and nickel acetate into the mixed solvent in sequence, stirring until completely dissolved, pouring the obtained mixed solution into a hydrothermal kettle for solvothermal reaction, and obtaining a precursor;

[0035] S3: Lithium acetate and the precursor are added to absolute ethanol, stirred, evaporated to dryness, and sintered to obtain LiNi, a cathode active material for a spinel lithium-ion battery. 0.5 mn 1.5 o 4 .

[0036] The preparation method of the positive electrode active material of the spinel type lithium ion battery provided by the present invention, first select hexamethylenetetramine as the precipitating agent, the m...

Embodiment 1

[0049] This embodiment provides a method for preparing a positive electrode active material for a spinel lithium-ion battery, comprising:

[0050] S1: Dissolve 1.96g of hexamethylenetetramine in 70ml of a mixed solvent, and stir at room temperature until the solution is clear; the mixed solvent is composed of diethylene glycol and deionized water with a volume ratio of 1:1;

[0051] S2: 2.75g Mn(CH 3 COO) 2 4H 2 O and 0.93g Ni(CH 3 COO) 2 4H 2 O was sequentially added to the above mixed solvent, stirred at room temperature until completely dissolved, the resulting mixed solution was poured into a hydrothermal kettle, and kept at 180°C for 24 hours to obtain a precursor;

[0052] S3: Add 0.8g CH 3 COOLi·2H 2 O and the precursor were added to 60mL of absolute ethanol, stirred at 2000r / min magnetically at room temperature until the absolute ethanol was evaporated to dryness, and the sample obtained by evaporation was placed in a ceramic crucible and placed in the center of...

Embodiment 2

[0060] This example provides a method for preparing a positive electrode active material of a spinel lithium-ion battery. Compared with Example 1, step S2 in this example is kept at 160° C. for 24 hours to obtain a precursor. Other steps are with embodiment 1.

[0061] Lithium-ion battery cathode material LiNi that the present embodiment makes 0.5 mn 1.5 o 4 The micro-morphological structure is similar to that in Example 1, which is LiNi with micro-nano hierarchical porous structure and composed of several orthogonal nanosheets. 0.5 mn 1.5 o 4 Material.

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Abstract

The invention discloses a spinel type lithium ion battery cathode active material and a preparation method thereof. The cathode active material is of a micro-nano hierarchical porous structure and iscomposed of a plurality of orthogonal LiNi0.5Mn1.5O4 nanosheets, and the dominant exposed crystal faces of the LiNi0.5Mn1.5O4 nanosheets are {111} crystal faces. The preparation method comprises the following steps: firstly, selecting hexamethylenetetramine as a precipitator and a mixed solution of diethylene glycol and deionized water as a solvent; dissolving manganese acetate and nickel acetatein the mixed solvent, carrying out a solvothermal reaction, uniformly distributing lithium acetate on the carbonate precipitate through absolute ethyl alcohol, evaporating the absolute ethyl alcohol,and sintering to obtain the spinel type lithium ion battery cathode active material. The cathode active material provided by the invention can enable the lithium ion battery to have high energy density, excellent rate capability, excellent long cycle performance and rapid charging / discharging performance; and the preparation method provided by the invention is simple in process and low in cost, and the prepared cathode active material is used for the lithium ion battery, so that the performance of the lithium ion battery is excellent.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery preparation, in particular to a spinel-type lithium-ion battery cathode active material and a preparation method thereof. Background technique [0002] With the continuous and rapid development of portable electronic devices and electric vehicles, human society has put forward more stringent requirements for the currently widely used lithium-ion battery system. Therefore, the research and development of high-performance lithium-ion batteries with excellent fast charge / discharge performance and long-term cycle performance at high currents are of great significance to promote social development. [0003] As far as the current research on positive electrode active materials for lithium-ion batteries is concerned, LiNi 0.5 mn 1.5 o 4 Due to its high working voltage and theoretical specific capacity, it is favored by many researchers, and it is the most promising candidate for the next g...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 孙巍巍李宇杰郑春满
Owner NAT UNIV OF DEFENSE TECH
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