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Modifying method of lithium nickel manganese oxide

A lithium nickel manganese oxide modification technology, which is applied in the field of lithium ion battery cathode material preparation, can solve the problems of poor capacity and rate performance of lithium nickel manganese oxide materials, increased electrode/electrolyte interface impedance, and rapid cycle performance decay. Achieve capacity and cycle performance guarantee, easy continuous industrial production, and reduce the effect of side reactions

Active Publication Date: 2017-12-15
HEFEI GUOXUAN HIGH TECH POWER ENERGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The unmodified lithium nickel manganese oxide material has poor capacity and rate performance, and it is easy to produce gas during the battery manufacturing process, which increases the electrode / electrolyte interface impedance, rapidly decays the cycle performance, and shortens the battery life, which in turn causes a chain electrochemical reaction , to promote the decomposition of the electrolyte and release a large amount of gas
Especially after the lithium nickel manganese oxide battery is stored at high temperature, a large amount of gas will accumulate inside the battery, and the expansion phenomenon of the battery is very obvious, which seriously restricts the performance of the battery

Method used

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  • Modifying method of lithium nickel manganese oxide
  • Modifying method of lithium nickel manganese oxide
  • Modifying method of lithium nickel manganese oxide

Examples

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Effect test

Embodiment 1

[0025] A modification method of lithium nickel manganese oxide, comprising the steps of:

[0026] (1) Accurately weigh lithium carbonate, nickel sulfate, and manganese sulfate according to Li:Ni:Mn element ratio of 2:1:3, disperse by ball milling with isopropanol for 5 hours, and dry the obtained slurry in vacuum at 90°C , after grinding, pre-fire in an air atmosphere at 500°C for 4 hours, take it out after natural cooling, and grind to obtain a pure-phase lithium nickel manganese oxide precursor;

[0027] (2) Press Ba 5 Nb 4 o 15 : BaWO 4 : PVA=1:0.5:0.025 mass ratio to weigh Ba 5 Nb 4 o 15 、BaWO 4 , PVA, mixed to form Ba 5 Nb 4 o 15 -0.5BaWO 4 -0.025PVA composite; 2% of the mass fraction of lithium nickel manganese oxide precursor was synthesized theoretically, and Ba was weighed 5 Nb 4 o 15 -0.5BaWO 4 -0.025 PVA composite, mixed with the pure-phase lithium nickel manganese oxide precursor in step (1), using isopropanol as a dispersant, performing ball milling...

Embodiment 2

[0031] A modification method of lithium nickel manganese oxide, comprising the steps of:

[0032] (1) Accurately weigh lithium carbonate, nickel sulfate and manganese sulfate according to Li:Ni:Mn element ratio of 2:1:3, disperse by ball milling with isopropanol for 2 hours, and dry the obtained slurry under vacuum at 80°C , after grinding, pre-calcine in an air atmosphere at 450°C for 2 hours, take it out after natural cooling, and grind to obtain a pure-phase lithium nickel manganese oxide precursor;

[0033] (2) Press Ba 5 Nb 4 o 15 : BaWO 4 : PVA=1:0.1:0.01 mass ratio to weigh Ba 5 Nb 4 o 15 、BaWO 4 , PVA, mixed to form Ba 5 Nb 4 o 15 -0.1 BaWO 4 -0.01PVA compound; according to the theoretical synthesis of 0.05% of the mass fraction of lithium nickel manganese oxide precursor, weigh Ba 5 Nb 4 o 15 -0.1 BaWO 4 - 0.01 PVA composite, mixed with the pure-phase lithium nickel manganese oxide precursor in step (1), using isopropanol as a dispersant, performing bal...

Embodiment 3

[0037] A modification method of lithium nickel manganese oxide, comprising the steps of:

[0038] (1) Accurately weigh lithium acetate, nickel nitrate, and manganese nitrate according to Li:Ni:Mn element ratio of 2:1:3, disperse by ball milling with absolute ethanol for 4 hours, and dry the obtained slurry under vacuum at 90°C , after grinding, pre-calcine in an air atmosphere at 500°C for 3 hours, take it out after natural cooling, and grind to obtain a pure-phase lithium nickel manganese oxide precursor;

[0039] (2) Press Ba 5 Nb 4 o 15 : BaWO 4 : PVA=1:0.2:0.02 mass ratio to weigh Ba 5 Nb 4 o 15 、BaWO 4 , PVA, mixed to form Ba 5 Nb 4 o 15 -0.2BaWO 4 -0.02PVA compound; synthesize 1% of the mass fraction of lithium nickel manganese oxide precursor according to theory, weigh Ba 5 Nb 4 o 15 -0.2BaWO 4 -0.02 PVA composite, mixed with the pure-phase lithium nickel manganese oxide precursor in step (1), using alcohol as a dispersant, performing ball milling for 4 h...

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Abstract

The invention discloses a modifying method of lithium nickel manganese oxide. The modifying method comprises the following steps that Ba5Nb4O15 and BaWO4 are added into polyving alcohol to be mixed to form a compound, after being mixed with a lithium nickel manganese oxide precursor and a dispersing agent, the compound is added into a ball mill to be dispersed and is then subjected to vacuum drying to obtain a dried material; the dried material is calcined at 800-1,000 DEG C under air atmosphere for 4-12 h, the temperature is reduced to 500-700 DEG C, and the temperature is maintained for 4-10 h for annealing treatment, so that the modified lithium nickel manganese oxide anode material is obtained. The Ba5Nb4O15-BaWO4-PVA compound can effectively coat the surface of lithium nickel manganese oxide to inhibit dissolution of manganese and reduce the occurrence of side reactions of the anode material under high voltage, and the capacity and the cycle performance of a battery are effectively guaranteed; according to the modified lithium nickel manganese oxide anode material, the technology process is simple, continuous industrialized production is facilitated, and the modifying method has a wide application prospect in the field of a lithium-ion battery.

Description

technical field [0001] The invention belongs to the field of preparation of positive electrode materials for lithium ion batteries, in particular to a method for modifying lithium nickel manganese oxide, in particular to a composite material coated lithium nickel manganese oxide (LiNi 0.5 mn 1.5 o 4 ) preparation method. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, high energy density, low self-discharge rate, wide operating temperature range, long cycle life, environmental protection, no memory effect, and high current charging and discharging. Lithium-ion batteries are also used in power batteries for electric vehicles. Gradually show broad application prospects. In LiNi 0.5 mn 1.5 o 4 In the process of charging and discharging, manganese exists in a tetravalent state. In the process of charging and discharging, manganese element does not participate in the oxidation-reduction reaction, but only plays the role of supporting...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/628H01M10/0525H01M2004/028Y02E60/10
Inventor 刘兴亮杨茂萍李道聪
Owner HEFEI GUOXUAN HIGH TECH POWER ENERGY
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