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Lithium secondary battery lithium-rich cathode composite and preparation method thereof

A lithium secondary battery, composite material technology, applied in battery electrodes, circuits, electrical components, etc., can solve problems such as poor cycle performance

Inactive Publication Date: 2016-08-17
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, lithium-rich cathode materials also have disadvantages that cannot be ignored, that is, poor cycle performance

Method used

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  • Lithium secondary battery lithium-rich cathode composite and preparation method thereof
  • Lithium secondary battery lithium-rich cathode composite and preparation method thereof
  • Lithium secondary battery lithium-rich cathode composite and preparation method thereof

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preparation example Construction

[0041] The invention provides a method for preparing a lithium-rich cathode composite material for a lithium secondary battery, comprising the following steps:

[0042] Precipitating a reaction solution containing nickel salt, cobalt salt, manganese salt, sodium carbonate and a chelating agent to obtain a precursor;

[0043] Pre-calcining the precursor to obtain a pre-calcining precursor;

[0044] Calcining the mixture comprising the pre-calcined precursor and the lithium salt for the first time to obtain a matrix material;

[0045] The matrix material and the tungsten salt are mixed and calcined for the second time to obtain a lithium-rich cathode composite material.

[0046] In the invention, the reaction solution containing nickel salt, cobalt salt, manganese salt, sodium carbonate and chelating agent is subjected to precipitation reaction to obtain the precursor. In the present invention, the nickel salt is preferably one, two or three of nickel carbonate, nickel sulfate...

Embodiment 1

[0074] Add ammonia water dropwise to the mixed solution of 0.5 mol / L nickel nitrate, 0.5 mol / L cobalt carbonate and 2 mol / L manganese sulfate until the concentration of ammonia water is 0.2 mol / L. Then, add sodium carbonate until the concentration of sodium carbonate is 0.5mol / L. Precipitate at 60°C for 12 hours to obtain a pale yellow solution. After standing for 6 hours, wash with distilled water, filter, and dry the filtered solid at 60°C for 24 hours to obtain the precursor Mn 0.54 Ni 0.13 co 0.13 (CO 3 ) 0.8 .

[0075] The precursor was pre-calcined at 300° C. for 4 hours to obtain a pre-calcined precursor. A mixture of 1 part by mass of the pre-calcined precursor and 0.8 parts by mass of lithium carbonate was ball milled at a speed of 200 r / min for 8 hours, and the mixture obtained by ball milling was calcined at 800 °C for 12 hours in an air atmosphere, and then cooled to room temperature to obtain a matrix material LMSS.

[0076] Dissolve 1 part by mass of LMSS...

Embodiment 2

[0083] to 0.5mol / L NiSO 4 .6H 2 O, 0.5mol / L CoSO 4 .7H 2 O, 2mol / L MnSO 4 .H 2 Aqueous ammonia was added dropwise to the mixed solution of O to a concentration of 0.5mol / L. Then, add sodium carbonate until the concentration of sodium carbonate is 0.2mol / L. The precipitation reaction was carried out at 80° C. for 10 hours to obtain a pale yellow solution. After standing for 6 hours, wash with distilled water, filter, and dry the filtered solid at 60°C for 24 hours to obtain the precursor Mn 0.54 Ni 0.13 co 0.13 (CO 3 ) 0.8 .

[0084] The precursor was pre-calcined at 450° C. for 8 hours to obtain a pre-calcined precursor. A mixture of 1 mass part of pre-calcined precursor and 0.8 mass part of lithium carbonate was ball milled at a speed of 250r / min for 8 hours, and the mixture obtained by ball milling was calcined at 900°C for 10h in an air atmosphere, and then cooled to room temperature to obtain a matrix material LMSS.

[0085] Dissolve 1 part by mass of LMSS an...

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Abstract

The invention provides a preparation method of a lithium secondary battery lithium-rich cathode composite, comprising the following steps: subjecting a reaction solution containing nickel salts, cobalt salts, manganese salts, sodium carbonate and a chelating agent to precipitation to obtain a precursor; pre-calcining the precursor to obtain a pre-calcined precursor; subjecting a mixture containing the pre-calcined precursor and lithium salts to first calcining to obtain a base material; subjecting a mixture of the base material with tungsten salts to second calcining to obtain WO3-coated lithium-rich cathode composite (LMSS / WO3). Detection results according to embodiments show that the LMSS / WO3 obtained herein is up to 255 mAh / g in initial discharge specific capacity that is 239 mAh / g after 50 cycles, with capacity holding rate being 93%.

Description

technical field [0001] The invention relates to the technical field of lithium secondary batteries, in particular to a lithium-rich cathode composite material for lithium secondary batteries and a preparation method thereof. Background technique [0002] In recent decades, with the rapid development of science and technology, the rapid development of industry and agriculture, and the sharp increase of human demand, energy shortage and environmental pollution have become the main problems restricting social development. In order to maintain the survival and development of human beings and solve the contradiction between man and nature, it is imperative to research and develop new green and environmentally friendly energy sources. New energy sources such as solar energy, wind energy, and biomass energy can alleviate the energy crisis caused by the consumption of irreversible resources on the one hand, and on the other hand can reduce the pollution of the natural environment an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/48H01M4/1391
CPCH01M4/1391H01M4/366H01M4/483H01M4/505H01M4/525Y02E60/10
Inventor 雷钢铁肖沙陈效兰
Owner XIANGTAN UNIV
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