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A modified single crystal multi-component positive electrode material and its preparation method

A cathode material and modification technology, applied in the field of new energy material preparation, can solve the problems of complicated preparation process, low volume energy density, poor high temperature cycle performance, etc., and achieve high volume energy density, high degree of monodispersity, compact density and high volumetric energy density

Active Publication Date: 2015-07-29
QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the shortcomings of the existing high-voltage multi-component positive electrode materials, such as low volume energy density, poor high-voltage high-temperature cycle performance, and cumbersome preparation process, the present invention provides a modified single-crystal multi-component positive electrode material with a high degree of monodispersity, which effectively improves the multi-component positive electrode material. The volume energy density of the positive electrode material has significantly improved the high-temperature cycle and high-temperature storage performance under high-temperature and high-voltage conditions. The entire preparation process is simple and the cost is greatly reduced.

Method used

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  • A modified single crystal multi-component positive electrode material and its preparation method
  • A modified single crystal multi-component positive electrode material and its preparation method
  • A modified single crystal multi-component positive electrode material and its preparation method

Examples

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Embodiment 1

[0031] Dissolve 60g of soluble chitosan in 1kg of water, stir well, then mix 202.18g of LiOH·H 2 O and 10.11g LiF were sequentially added to the above solution, heated and stirred evenly to obtain a mixed sol with uniform particle size distribution; 400g co-precipitated porous precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 and added to the above mixed sol, heated and stirred at 80°C, and slowly evaporated to dryness, so that the mixed sol entered the interior of the porous precursor and evenly adsorbed and deposited on the inner pore surface and outer surface of the porous precursor to obtain the mixture B1; after drying, mix Material A was sintered once at a temperature of 970°C and held for 12 hours to obtain a modified monocrystalline multi-component positive electrode material C1 with a high degree of monodispersity (such as figure 1 (a), (b) shown). The particle size of the monocrystalline multi-element cathode material C1 presents a normal distribution and a high compaction d...

Embodiment 2

[0038] Dissolve 16g of polyvinyl alcohol in 3.68kg of water, stir evenly, then mix 183.8g of LiOH·H 2 O with 23.89g Li 3 PO 4 Add it to the above solution in turn, heat and stir evenly to obtain a mixed sol with uniform particle size distribution; take 400g of co-precipitated porous precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 and added to the above mixed sol, heated and stirred at 80°C, and slowly evaporated to dryness, so that the mixed sol entered the interior of the porous precursor and evenly adsorbed and deposited on the inner pore surface and outer surface of the porous precursor to obtain the mixture B2; after drying, mix The material A was sintered once at a temperature of 980° C. and held for 20 hours to obtain a modified single crystal multi-component positive electrode material C2 with a high degree of monodispersity.

Embodiment 3

[0040] Dissolve 80g of polyvinylpyrrolidone in 2.2kg of water, stir well, then mix 220.56g of LiOH·H 2 O with 2.51gLiH 2 PO 4 Add it to the above solution in turn, heat and stir evenly to obtain a mixed sol with uniform particle size distribution; take 400g of co-precipitated porous precursor Ni 0.5 co 0.2 mn 0.3 (OH) 2 And add it to the above mixed sol, heat and stir at 70°C, and slowly evaporate to dryness, so that the mixed sol enters the interior of the porous precursor and is evenly adsorbed and deposited on the inner pore surface and outer surface of the porous precursor to obtain the mixture B3; after drying, mix The material A was sintered once at a temperature of 1100° C. and held for 15 hours to obtain a modified single crystal multi-component positive electrode material C3 with a high degree of monodispersity.

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Abstract

The invention discloses a modified single crystal type multielement anode material and a preparation method thereof. Lithium salt containing modified anions is dispersed to a water solution which contains dissolvable lithium salt and an organic pore-forming agent, a coprecipitation multihole precursor is added into the mixture, and then modified single crystal type multielement anode material which has the D50 equal to 2-30mu m and is quite high in monodispersity degree is successfully prepared through a 'once sintering' process. Compared with the prior art, the modified single crystal type multielement anode material provided by the invention has the following obvious advantages: (1) the 'once sintering' process is adopted, the technical route is simple, and the cost is reduced substantially; (2) the monodispersity degree of the prepared single crystal multielement anode material is quite high, the compaction density and the energy density are high, the high-temperature cycle performance is excellent, and the modified single crystal type multielement anode material can be applied to electric tools, such as high energy density type consume electronic products, electro-mobiles and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of new energy materials, in particular to the preparation of a cathode material for a lithium ion battery. Background technique [0002] The current portable electronic products, especially the increasingly popular smart phones, have higher and higher requirements for battery energy density, and increasing the charge cut-off voltage is the most direct and effective means to further increase the energy density without changing the positive electrode; cobalt As the most mature lithium battery cathode material at present, Lithium Oxide has a theoretical capacity of 274mAh / g, but deep discharge will cause the structure to collapse. 2 In general, nickel is the main electrochemically active substance, cobalt can reduce the electrochemical polarization of the material and increase the rate, and manganese can improve structural stability and thermal stability, so the synergistic effect of two or three...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525
CPCY02E60/122Y02E60/10
Inventor 向德波周恒辉
Owner QINGHAI TAIFENG XIANXING LITHIUM ENERGY TECH CO LTD
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