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Low temperature synthesizing method of long life lithium vanadate

A synthesis method, lithium vanadate technology, applied in vanadium compounds, chemical instruments and methods, electrode manufacturing, etc., can solve the problems of poor product uniformity, high reaction temperature, high energy consumption, etc., to prolong cycle life and reduce diffusion resistance , composed of easy-to-control effects

Inactive Publication Date: 2009-08-12
TIANJIN B&M SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1) The reaction temperature is high, so the energy consumption is high; 2) The reactant is volatile at high temperature, so it is difficult to accurately control the stoichiometric ratio of lithium and vanadium; 3) In the molten state at high temperature, the reaction mixture corrodes the reactor severely; 4) The product obtained by this method has poor uniformity, poor batch stability, unsatisfactory electrochemical performance, low discharge specific capacity, and poor cycle stability.

Method used

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  • Low temperature synthesizing method of long life lithium vanadate
  • Low temperature synthesizing method of long life lithium vanadate
  • Low temperature synthesizing method of long life lithium vanadate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Using lithium hydroxide and vanadium pentoxide as raw materials, weigh 797.2g LiOH·H 2 O and 5456.4g V 2 o 5 , Measure 20L of deionized water, react at 60°C for 3h, and then air-dry at 100°C for 12h, the obtained solid is crushed and annealed in air at 120°C for 2h to obtain the product.

Embodiment 2

[0032] The raw materials and dosage are the same as in Example 1, reacted at 85°C for 1 hour, and then vacuum-dried at 80°C for 6 hours. The obtained solid was crushed and then annealed in air at 200°C for 3 hours to obtain the product.

Embodiment 3

[0034] Using lithium carbonate and vanadium pentoxide as raw materials, weigh 702.0g Li 2 CO 3 and 5456.4g V 2 o 5 , Measure 6.5L of distilled water, put it into a ball mill pot together with 10kg of zirconia balls, mill at 30-40°C for 2.5h, then vacuum-dry at room temperature for 24h, crush the obtained solid and anneal in air at 120°C for 2h to obtain the product.

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Abstract

The invention discloses a low temperature synthetic method for lithium vanadate with long service life, which comprises the following steps: firstly, reacting a lithium compound and a vanadium compound in water for 0.5 to 10 h at the temperature of room temperature to 90 DEG C according to the molar ratio (0.9 to 1.1) of a lithium ion and a vanadium ion, wherein the weight ratio of the water and a solid mixture is (1 to 10):1; secondly, drying the product prepared in the step 1 at the temperature of room temperature to 120 DEG C, wherein the drying time is 1 to 24h; and thirdly, annealing for 0.5 to 5h at the temperature of 100 to 400 DEG C. The invention has the advantages of accurate composition, long cycle life, controllable electrochemical performance, easy adulteration, cladding and other decorations, simple preparation method and low flow energy consumption.

Description

technical field [0001] The invention relates to the field of lithium-ion secondary battery cathode materials, in particular to a long-life lithium vanadate and a low-temperature synthesis method thereof. technical background [0002] Lithium-ion secondary battery is a new type of green high-energy rechargeable battery that appeared in the 1990s. It has many advantages such as high voltage, high energy density, good cycle performance, small self-discharge, no memory effect, and wide operating range. It is widely used in mobile Telephones, notebook computers, portable electric tools, electronic instruments, weapons and equipment, etc. also have good application prospects in electric vehicles, and have become the focus of research and development by countries all over the world. Cathode material is an important part of lithium-ion batteries, which determines the overall performance of lithium-ion batteries to a large extent, and is the key to improving the performance of lithiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/00H01M4/04H01M4/58
CPCY02E60/12Y02E60/10
Inventor 赵明周大桥吴孟涛
Owner TIANJIN B&M SCI & TECH
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