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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  • Application Information

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Problems solved by technology

The first two methods have the disadvantages of complex and changeable process, excessive energy consu

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

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Example Embodiment

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

Example Embodiment

[0021] Example 2: Combine 0.2mol lithium carbonate and 0.49mol TiO 2 (Anatase type), 0.005mol niobium pentoxide mixed, then put it into a ball mill for 8h to make it evenly mixed, then put the final mixture into a muffle furnace, react at 850℃ for 24h, then cool naturally Get Li at room temperature 4 Ti 4.9 Nb 0.1 O 12 . X-ray powder diffraction analysis shows that the resulting Li 4 Ti 4.9 Nb 0.1 O 12 Contains a small amount of Nb 2 O 5 Impurities. From the scanning electron microscope analysis, it is known that the particle size of the obtained product is uniform, and the particle size is 200-300nm. The resulting product was used as the electrode material and assembled into an experimental button-type lithium-ion battery in a glove box filled with argon. The charge and discharge cycle was performed at a rate of 0.1C between 0 and 2V. 4 Ti 4.9 Nb 0.1 O 12 The first discharge capacity is 355mAh·g -1 , The second discharge capacity is 248mAh·g -1 , The reversible capacity after ...

Example Embodiment

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