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Preparation method of porous morphology high voltage lithium nickel manganese oxide cathode material

A technology of lithium nickel manganese oxide and positive electrode materials, which is applied in the field of preparation of lithium nickel manganese oxide positive electrode materials with porous morphology and high voltage, can solve the problems of complex preparation process, capacity attenuation, volume change, etc., and achieve simple synthesis process and increased magnification Performance, the effect of changing the specific surface area

Active Publication Date: 2016-01-27
南京时拓能源科技有限公司
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  • Summary
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  • Description
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Problems solved by technology

Liquid phase methods include co-precipitation method, sol-gel method and molten salt method, etc., and the preparation process is complex
[0004] During the charge-discharge cycle of lithium nickel manganese oxide materials, the repeated deintercalation of lithium will cause structural stress and volume changes, resulting in capacity fading

Method used

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  • Preparation method of porous morphology high voltage lithium nickel manganese oxide cathode material
  • Preparation method of porous morphology high voltage lithium nickel manganese oxide cathode material
  • Preparation method of porous morphology high voltage lithium nickel manganese oxide cathode material

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specific Embodiment approach 1

[0022] Specific embodiment one: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0023] Weigh 0.03mol of manganese carbonate and calcinate in a muffle furnace at 800°C for 4 hours to obtain porous manganese trioxide; mix the above manganese trioxide with 0.01mol of nickel acetate and 0.02mol of lithium nitrate by ball milling for 2 hours to obtain a precursor; Put the above precursor in a muffle furnace, pre-calcine at 500°C for 4 hours, and calcinate at 850°C for 10 hours to obtain a porous lithium nickel manganese oxide material. The SEM image is as follows figure 1 shown.

[0024] The pore volume of lithium nickel manganese oxide material prepared in this embodiment is 0.3 cm 3 / g, the specific surface area is 13m 2 / g. Such as Figure 2-3 As shown, the specific capacity can reach 101.3mAh / g when discharged at 20C, and the specific capacity is 118.2mAh / g, 116.7mAh / g and 104.6mAh / g after 200 charge-discharge cycles at 1...

specific Embodiment approach 2

[0025] Specific embodiment two: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0026] Weigh 0.03mol of manganese carbonate and calcinate in a muffle furnace at 450°C for 4 hours to obtain porous manganese dioxide; disperse the above manganese dioxide, 0.01mol of nickel nitrate, 0.01mol of lithium acetate and 0.012mol of lithium hydroxide into 20ml of ethanol , stirring and volatilizing ethanol at room temperature to obtain a precursor; placing the above precursor in a muffle furnace, pre-calcining at 400°C for 3h, and calcining at 800°C for 12h to obtain a porous lithium nickel manganese oxide material.

[0027] The pore volume of lithium nickel manganese oxide material prepared in this embodiment is 0.25m 3 / g, the specific surface area is 22m 2 / g. When discharged at 10C, the specific capacity can reach 111.3mAh / g, and after 200 charge-discharge cycles at 2C rate, the specific capacity is 117.9mAh / g, and the capacity re...

specific Embodiment approach 3

[0028] Specific embodiment three: this embodiment prepares lithium nickel manganese oxide material according to the following steps:

[0029] Weigh 0.03mol of manganese oxalate and calcinate in a muffle furnace at 280°C for 6h to obtain porous manganese dioxide; disperse the above manganese dioxide, 0.005mol of nickel nitrate, 0.005mol of nickel formate, and 0.02mol of lithium formate into 15ml of ethanol , stirring and volatilizing ethanol at room temperature to obtain a precursor; placing the above precursor in a muffle furnace, pre-calcining at 400°C for 4 hours, and calcining at 800°C for 12 hours to obtain a porous lithium nickel manganese oxide material.

[0030] The pore volume of lithium nickel manganese oxide material prepared in this embodiment is 0.3m 3 / g, the specific surface area is 18m 2 / g. The specific capacity can reach 114.3mAh / g when discharged at 10C, and the specific capacity is 121.0mAh / g after 200 charge-discharge cycles at 2C rate, and the capacity r...

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Abstract

A preparation method of a high-voltage nickel lithium manganate cathode material with porous morphology belongs to the field of material synthesis technology. The method is as below: calcining manganese salt at 200-800 DEG C for 3-10 h to obtain a porous manganese oxide A; weighing a lithium source, a nickel source and the manganese oxide A according to a molar ratio of Li:Ni:Mn=1-1.1:0.5:1.5, and mixing the three to obtain a precursor; putting the precursor in a muffle furnace air atmosphere, pre-sintering at 300-500 DEG C for 3-8 h, heating to 700-1000 DEG C and calcining for 8-20 h to obtain the nickel lithium manganate material. The particles of the nickel lithium manganate cathode material prepared by the invention have a porous structure and controllable morphology. The apertures in the porous nickel lithium manganate can buffer changes in structural stress and volume caused by lithium de-intercalation, enhance cycle performance, shorten transmission distance of lithium ions, increase the contact area of the electrode and an electrolyte and improve multiplying power performance, thereby gaining excellent multiplying power performance and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of material synthesis, and relates to a preparation method of a lithium ion battery positive electrode material, in particular to a preparation method of a porous high-voltage lithium nickel manganese oxide positive electrode material. Background technique [0002] The demand for energy in modern society is increasing day by day. The oil crisis and global climate change in recent years have prompted people to change the current status of dependence on oil and promote the transformation of alternative energy sources such as solar energy, wind energy, and nuclear energy into electrical energy. Technologies need to be developed to store this energy in a portable manner. As another secondary battery after lead-acid batteries, nickel-cadmium batteries and nickel-metal hydride batteries, lithium-ion batteries have significant advantages such as no memory effect, high working voltage, low self-discharge rate, long...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCH01M4/505H01M4/525Y02E60/10
Inventor 王振波薛原李超张音玉富达刘宝生顾大明尹鸽平
Owner 南京时拓能源科技有限公司
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