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Niobium-doped lithium titanate anode material for lithium ion battery and method for preparing same

A technology for lithium-ion batteries and negative electrode materials, applied in battery electrodes, circuits, electrical components, etc., can solve problems that are not conducive to large-scale industrial production, complex and changeable processes, and excessive energy consumption, and achieve considerable reversible capacity, reversible Good controllability and stable cycle life

Inactive Publication Date: 2010-08-18
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The first two methods have the disadvantages of complex and changeable process, excessive energy consumption, and high cost, which are not conducive to the realization of large-scale industrial production

Method used

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  • Niobium-doped lithium titanate anode material for lithium ion battery and method for preparing same
  • Niobium-doped lithium titanate anode material for lithium ion battery and method for preparing same
  • Niobium-doped lithium titanate anode material for lithium ion battery and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0020] Embodiment 1: with 0.2mol lithium carbonate, 0.495mol TiO 2 (Anatase type) and 0.0025mol niobium pentoxide are mixed, then put into a ball mill and milled for 8 hours to make it evenly mixed, then put the final mixture into a muffle furnace, react at 850°C for 24 hours, and then cool naturally to room temperature, that is Li 4 Ti 4.95 Nb 0.05 o 12 . X-ray powder diffraction analysis indicated that the resulting Li 4 Ti 4.95 Nb 0.05 o 12 It is a pure phase, without any other impurity phase, and has high crystallinity. According to scanning electron microscope analysis, the particle size of the obtained product is uniform and consistent, and the particle size is 200-300nm. The resulting product was used as an electrode material, and was assembled into an experimental button lithium-ion battery in an argon-filled glove box. The charge-discharge cycle was performed between 0-2V at a rate of 0.1C, and Li 4 Ti 4.95 Nb 0.05 o 12 The first discharge capacity is 343...

Embodiment 2

[0021] Embodiment 2: with 0.2mol lithium carbonate, 0.49mol TiO 2 (Anatase type), 0.005mol niobium pentoxide mixed, and then put into a ball mill for ball milling for 8 hours to make it evenly mixed, then put the final mixture into a muffle furnace, react at 850°C for 24 hours, and then cool naturally to room temperature, that is Li 4 Ti 4.9 Nb 0.1 o 12 . X-ray powder diffraction analysis indicated that the resulting Li 4 Ti 4.9 Nb 0.1 o 12 Contains a small amount of Nb 2 o 5 Impurities. According to scanning electron microscope analysis, the particle size of the obtained product is uniform and consistent, and the particle size is 200-300nm. The resulting product was used as an electrode material and assembled into an experimental button lithium-ion battery in an argon-filled glove box. The charge-discharge cycle was performed between 0-2V at a rate of 0.1C, and Li 4 Ti 4.9 Nb 0.1 o 12 The first discharge capacity is 355mAh·g -1 , the second discharge capacity ...

Embodiment 3

[0022] Embodiment 3: with 0.4mol lithium acetate, 0.495mol TiO 2 (Anatase type), 0.0025mol niobium pentoxide mixed, and then put into a ball mill for 6 hours to make it evenly mixed, then put the final mixture into a muffle furnace, react at 900°C for 22 hours, and then cool naturally to room temperature, that is Li 4 Ti 4.95 Nb 0.05 o 12. The resulting product was used as an electrode material, and was assembled into an experimental button lithium-ion battery in an argon-filled glove box. The charge-discharge cycle was performed between 0-2V at a rate of 0.1C, and Li 4 Ti 4.95 Nb 0.05 o 12 The first discharge capacity is 344mAh·g -1 , the second discharge capacity is 236mAh·g -1 , with a reversible capacity of 199mAh g after 50 cycles -1 , Li 4 Ti 4.95 Nb 0.05 o 12 exhibited excellent electrochemical performance.

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Abstract

The invention relates to a niobium-doped anode material for a lithium ion battery and a method for preparing the same, belonging to the technical filed of the anode material for the lithium ion battery. The niobium-doped anode material for the lithium ion battery has the chemical formula of Li4Ti5-xNbxO12, wherein the x is equal to 0.05-0.1. The method for preparing the niobium-doped anode material for the lithium ion battery comprises the following steps: mixing niobium source, TiO2 source and lithium source, grinding the mixture by a ball grinder for 6-10h, putting the ground mixture in a muffle furnace, making the ground mixture react at 800-900 DEG C for 16-24h, and naturally cooling the product of reaction to room temperature to obtain the niobium-doped anode material for the lithium ion battery, which has the chemical formula of Li4Ti5-xNbxO12. The method for preparing the niobium-doped anode material for the lithium ion battery uses the raw materials of wide source and no organic chelating agent, is convenient to operate, is controllable and repeatable and ensures that the particles of the niobium-doped anode material for the lithium ion battery are small and are uniform in size and have high crystallinity and the niobium-doped anode material for the lithium ion battery has higher electrochemical performance and is prepared with low cost.

Description

technical field [0001] The invention belongs to the technical field of negative electrode materials for lithium ion batteries, and in particular relates to a lithium titanate negative electrode material for lithium ion batteries doped with niobium and a preparation method thereof. Background technique [0002] On the one hand, 42% of the global air pollution comes from traffic vehicles; on the other hand, the oil crisis is getting worse. For this reason, countries all over the world attach great importance to the development of electric vehicles (EV) and hybrid electric vehicles (HEV). As a power source, there is no battery that can be compared with petroleum, and power batteries have become a bottleneck restricting the development of EVs and HEVs. Lithium-ion battery has become a research and development hotspot of power battery because of its high working voltage, high specific energy and specific power, long cycle life and low environmental pollution. It is considered to...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505
CPCY02E60/122Y02E60/10
Inventor 伊廷锋岳彩波诸荣孙乔红斌
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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