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Tin-oxide coated and vanadium-doped lithium iron phosphate material and preparation method thereof

A lithium iron phosphate and tin oxide technology, applied in electrical components, battery electrodes, circuits, etc., can solve the problems of poor high temperature cycle stability, poor electrical conductivity, low tap density, etc., and achieve high tap and compaction density and low internal resistance. , the effect of low cost

Active Publication Date: 2013-04-24
ZHEJIANG NARADA POWER SOURCE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the surface coating technology to coat a layer of oxide film on the surface of the positive electrode active material of the lithium ion battery, which overcomes the existing technical defects of poor electrical conductivity, low tap density, and poor high-temperature cycle stability of lithium iron phosphate, and has high performance. high cycle stability

Method used

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  • Tin-oxide coated and vanadium-doped lithium iron phosphate material and preparation method thereof
  • Tin-oxide coated and vanadium-doped lithium iron phosphate material and preparation method thereof
  • Tin-oxide coated and vanadium-doped lithium iron phosphate material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 4.7g ammonium metavanadate (NH 4 VO 3 ) and 21g tin tetrachloride (SnCl 4 ), dissolved in 100mL water to form a solution; the obtained solution was fully mixed with 360g ferrous oxalate, 230g ammonium dihydrogen phosphate and 74g lithium carbonate, ball milled, and dried to obtain a precursor material; the precursor material was finely crushed And heated to 680°C at a heating rate of 2°C / min under a nitrogen protective atmosphere, held for 12 hours, and cooled with the furnace to obtain lithium iron phosphate products, which were crushed by airflow to obtain tin oxide-coated vanadium-doped iron phosphate lithium material.

[0029] The obtained vanadium-doped tin oxide-coated lithium iron phosphate composite material was observed by scanning electron microscope, and the results were as follows: figure 1 shown. From figure 1 It can be seen that the primary particle size of the obtained vanadium-doped tin oxide-coated lithium iron phosphate composite material is 200-...

Embodiment 2

[0033] 3.64g vanadium pentoxide (V 2 o 5) and 21g tin tetrachloride (SnCl 4 ), dissolved in 100mL of water to form a solution; the obtained solution was fully mixed with 160g of iron oxide, 230g of ammonium dihydrogen phosphate and 74 grams of lithium carbonate, ball milled, and dried to obtain the precursor material. Heating at a heating rate of 3°C / min to 730°C, holding the temperature for 8 hours, and cooling with the furnace, the lithium iron phosphate product was obtained, and after jet crushing, a tin oxide-coated vanadium-doped lithium iron phosphate material was obtained.

Embodiment 3

[0035] 3g vanadium trioxide (V 2 o 3 ) and 10.8g of stannous oxide (SnO) were dissolved in 100mL of water using oxalic acid to form a solution; the obtained solution was fully mixed with 156g of iron oxide, 230g of ammonium dihydrogen phosphate and 74g of lithium carbonate, ball milled, and dried to obtain a precursor Materials, after fine crushing, in nitrogen-hydrogen mixed atmosphere with 3

[0036] The heating rate of ℃ / min is heated to 730 ℃, kept for 8 hours, and cooled with the furnace to obtain the lithium iron phosphate product. After jet crushing, the tin oxide-coated vanadium-doped lithium iron phosphate material is obtained.

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Abstract

The invention discloses a tin-oxide coated and vanadium-doped lithium iron phosphate material and a preparation method thereof. The surface of an active substance for the positive electrode of a lithium-ion battery is coated with a layer of an oxide film, the vanadium is doped for diffusion modification of irons, and the LiFe[1-x]VxPO4.ySnO which is the lithium iron phosphate positive material is synthesized by one-step reaction, wherein x is not less than 0.01 and not more than 0.05, and y is not less than 0.005 and not more than 0.05. The lithium iron phosphate positive material with a stable structure and high electrochemical activity is prepared by adopting a simple method, overcomes the technical defects of poor electrical conductivity, low tap density and poor high-temperature circulation stability of the existing lithium iron phosphate and has a strong competitive advantage in the aspects of cost control, process simplification, discharge capacity, circularity and high-current discharge capability. In addition, the lithium-ion battery composite positive material has high performance and good circulation stability.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials, and in particular relates to lithium-ion battery cathode materials and a preparation method. Background technique [0002] With the rapid development of the power battery and energy storage battery industry, people have put forward higher requirements for the service life and safety performance of lithium-ion batteries. Compared with other traditional positive electrode materials, lithium iron phosphate material has the advantages of good cycle performance, high safety performance, abundant raw material sources, low price, and environmental protection, which has attracted widespread attention and research, so it has become the first choice for power and energy storage lithium-ion batteries Cathode material. However, lithium iron phosphate materials still have problems such as high-temperature cycle capacity fading, low electronic conductivity and ion diffusion r...

Claims

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Application Information

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IPC IPC(8): H01M4/58
CPCY02E60/12Y02E60/10
Inventor 姜应律蔡若愚杨国凯钟雅文
Owner ZHEJIANG NARADA POWER SOURCE CO LTD
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