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Preparation method of wide potential window negative electrode material of lithium ion battery

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as high cost, complex synthesis methods and routes, and achieve high reproducibility, reduce actual costs, and stabilize cycle life Effect

Inactive Publication Date: 2012-03-07
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

There are literature (Jian Gao et al. Journal of The Electrochemical Society , 2010, 157 (2): K39-K42; Jian Gao et al. Ionics , 2009, 15(5): 597–601.) report: Doping Li with La 4 Ti 5 o 12 , to improve its electrochemical performance, but the synthesis method used is the sol-gel method, and the raw material used is TiCl 4 、LaCl 3 , the charge and discharge voltage range is 1-3 V, the synthesis method and route are relatively complicated, and the cost is high

Method used

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  • Preparation method of wide potential window negative electrode material of lithium ion battery
  • Preparation method of wide potential window negative electrode material of lithium ion battery
  • Preparation method of wide potential window negative electrode material of lithium ion battery

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Effect test

Embodiment 1

[0022] Embodiment 1: with 0.22 mol lithium carbonate, 0.495 mol TiO 2 (Anatase type) and 0.005 mol lanthanum nitrate were mixed, and then put into a ball mill for 8 h to make it evenly mixed, and then put the final mixture into a muffle furnace, reacted at 850°C for 24 h, and then cooled naturally to room temperature, that is Li 4 Ti 4.95 La 0.05 o 12 . X-ray powder diffraction analysis indicated that the resulting Li 4 Ti 4.95 La 0.05 o 12 There are a few impurity peaks, and the crystallinity is high. According to scanning electron microscope analysis, the particle size of the obtained product is uniform, and the particle size is 1-2 μm. The resulting product was used as an electrode material and assembled into an experimental button lithium-ion battery in an argon-filled glove box. C The rate of charge and discharge cycle between 0-2.5 V, Li 4 Ti 4.95 La 0.05 o 12 The first discharge capacity is 243.9 mAh·g -1 , the second discharge capacity is 213.6 mAh·g -1...

Embodiment 2

[0023] Embodiment 2: with 0.23mol lithium carbonate, 0.49mol TiO 2 (Anatase type) and 0.01 mol lanthanum nitrate were mixed, and then put into a ball mill for 6 hours to make it evenly mixed, and then put the final mixture into a muffle furnace, reacted at 850°C for 18 hours, and then cooled naturally to room temperature , that is, Li 4 Ti 4.9 La 0.1 o 12 . X-ray powder diffraction analysis indicated that the resulting Li 4 Ti 4.9 La 0.1 o 12 Contains a small amount of Li 3x La 2 / 3?x TiO 3 Impurities. According to scanning electron microscope analysis, the particle size of the obtained product is uniform, and the particle size is 1-2 μm. The resulting product was used as an electrode material and assembled into an experimental button lithium-ion battery in an argon-filled glove box.C The rate of charge and discharge cycles between 0-2.5V, Li 4 Ti 4.9 La 0.1 o 12 The first discharge capacity is 235.1 mAh·g -1 , the second discharge capacity is 205.6 mAh g -1 ,...

Embodiment 3

[0024] Embodiment 3: with 0.4 mol lithium acetate, 0.495 mol TiO 2 (amorphous type), 0.0025 mol lanthanum trioxide mixed, and then put into a ball mill for ball milling for 12 hours to make it evenly mixed, then put the final mixture into a muffle furnace, react at 950°C for 12 hours, and then cool naturally to At room temperature, Li 4 Ti 4.95 La 0.05 o 12 . The resulting product was used as an electrode material and assembled into an experimental button lithium-ion battery in an argon-filled glove box. C The rate of charge and discharge cycles between 0-2.5V, Li 4 Ti 4.95 La 0.05 o 12 The first discharge capacity is 240.1mAh·g -1 , the second discharge capacity is 211.3 mAh·g -1 , with a reversible capacity of 201.8 mAh g after 100 cycles -1 , Li 4 Ti 4.95 La 0.05 o 12 Excellent rate performance over a wide potential window is shown.

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Abstract

The invention which provides a preparation method of a wide potential window negative electrode material of a lithium ion battery belongs to the technical field of lithium ion batteries. The preparation method of the invention comprises the following steps: 1, mixing a lanthanum source, TiO2 with different crystal forms, and a lithium source, and grinding for 6-12h in a ball mill to obtain a mixture; and 2, putting the mixture in a muffle furnace, reacting for 12-24h at 800-950DEG C, and naturally cooling to room temperature to obtain the wide potential window negative material Li4La5-xLaxO12of the lithium ion battery, wherein x is 0.05 or 0.1. The negative electrode material prepared in the invention has a wide potential window, a good reversible capacity, an excellent rate performance and a stable cycle life, so the material which has a high practical use value allows practical requirements of various applications of the lithium ion battery to be effectively satisfied. In addition, the method of the invention has the characteristics of simplified preparation technology, high controllable reappearance, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium ion batteries, and in particular relates to a preparation method of a lithium ion battery negative electrode material with a wide potential window. Background technique [0002] With the development of various electronic devices as well as electric vehicles and hybrid vehicles, higher requirements are placed on the lithium-ion batteries that provide energy for them. Lithium-ion batteries have high capacity density and energy density, and are recognized as the most promising power batteries. At present, the anode materials of commercial lithium-ion batteries mostly use various lithium intercalation carbon / graphite materials. However, the lithium intercalation potential (0~0.26 V) of carbon materials is very close to the deposition potential of metal lithium. When the battery is overcharged, metal lithium may Lithium dendrites will be precipitated on the surface of the carbon electrode, and if the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/62H01M4/485
CPCY02E60/10
Inventor 伊廷锋谢颖朱彦荣诸荣孙周安娜
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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