Positive electrode material, preparation method thereof and lithium ion battery

A positive electrode material and substrate technology, applied in the field of positive electrode material and its preparation, and lithium ion battery, can solve the problems such as the initial discharge capacity and cycle performance of quaternary positive electrode material to be improved, and achieve the improvement of chemical stability, crystallinity, The effect of reducing polarization loss

Pending Publication Date: 2020-11-10
SHENZHEN CITY BATTERY NANOMETER TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, the initial discharge capacity and cycle performance of ...

Method used

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  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery
  • Positive electrode material, preparation method thereof and lithium ion battery

Examples

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Embodiment 1

[0083] This embodiment provides a Li 6.5 Y 0.5 Zr 1.5 o 7 Coated boron-tungsten co-doped nickel-cobalt-manganese-aluminate positive electrode material and a preparation method thereof, the method comprising the following steps:

[0084] (1) A mixed solution containing nickel sulfate, cobalt sulfate and manganese sulfate with a metal ion concentration of 120g / L (Ni, Co, Mn molar ratio is 8.9:0.7:0.4), 20g / L sodium metaaluminate solution, 300g / L The sodium carbonate solution and 5mol / L ammonia water were reacted at 50°C and the pH value was 12.0 to obtain the precursor.

[0085] (2) Mix 20kg of the precursor obtained in step (1), 13.8kg of lithium nitrate, 140g of tungsten trioxide and 65 grams of boric acid, and sinter at 700°C for 10 hours to obtain the substrate; lithium ions in lithium nitrate and the precursor The molar ratio of nickel ions in is 1.05.

[0086] (3) Mix lithium hydroxide, yttrium oxide, and zirconium dioxide in a certain molar proportion evenly, so that...

Embodiment 2

[0093] This embodiment provides a Li 6.5 Y 0.5 Zr 1.5 o 7 Coated boron-tungsten co-doped nickel-cobalt-manganese-aluminate positive electrode material and a preparation method thereof, the method comprising the following steps:

[0094] (1) A mixed solution containing nickel sulfate, cobalt sulfate and manganese sulfate with a metal ion concentration of 110g / L (the molar ratio of Ni, Co, and Mn is 8.9:0.7:0.4), 20g / L sodium metaaluminate solution, 100g / L The sodium carbonate solution and 5mol / L ammonia water were reacted at 60°C and the pH value was 11.0 to obtain the precursor.

[0095](2) Mix 20kg of the precursor obtained in step (1), 7.5kg of lithium carbonate, 185g of tungsten trioxide and 65 grams of boric acid, and sinter at 710°C for 10h to obtain the substrate; lithium ions in lithium carbonate and the precursor The molar ratio of nickel ions in is 1.06.

[0096] (3) Mix a certain molar ratio of lithium hydroxide, yttrium oxide and zirconium dioxide uniformly so ...

Embodiment 3

[0103] The embodiment provides a kind of Li 6.5 Y 0.5 Zr 1.5 o 7 Coated boron-tungsten co-doped nickel-cobalt-manganese-aluminate positive electrode material and a preparation method thereof, the method comprising the following steps:

[0104] (1) A mixed solution containing nickel sulfate, cobalt sulfate and manganese sulfate with a metal ion concentration of 110g / L (the molar ratio of Ni, Co, and Mn is 9.1:0.5:0.4), 30g / L sodium metaaluminate solution, 100g / L A sodium carbonate solution and 5mol / L ammonia water were reacted at 55°C and a pH value of 11.5 to obtain a precursor.

[0105] (2) Mix 20 kg of the precursor obtained in step (1), 8.5 kg of lithium hydroxide, 235 g of tungsten trioxide and 65 grams of boric acid, and sinter at 700 ° C for 10 hours to obtain the substrate; lithium ions in lithium hydroxide and The molar ratio of nickel ions in the precursor is 1.06.

[0106] (3) Mix a certain molar ratio of lithium hydroxide, yttrium oxide and zirconium dioxide un...

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Abstract

The invention provides a positive electrode material, a preparation method thereof and a lithium ion battery. The positive electrode material comprises a base material and a coating layer coating thebase material, the base material comprises boron-tungsten co-doped lithium nickel cobalt manganese aluminate, and the coating layer comprises a lithium salt coating layer containing yttrium and zirconium. The preparation method comprises the following steps of (1) preparing a nickel-cobalt-manganese-aluminum precursor; (2) preparing the boron-tungsten co-doped nickel-cobalt-manganese-lithium aluminate; (3) preparing a coating layer material; and (4) preparing the positive electrode material from the boron-tungsten co-doped nickel-cobalt-manganese-lithium aluminate and the coating layer material. The particles of the positive electrode material provided by the invention are secondary particles, and the positive electrode material is uniform in particle distribution, good in fluidity and good in compaction performance, and has excellent first discharge capacity, rate capability and cycle performance.

Description

technical field [0001] The invention belongs to the technical field of energy storage materials, and relates to a positive electrode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Lithium-ion batteries have the advantages of high energy density, wide operating temperature range, no memory effect, and long cycle life. They are widely used in digital products and power tools, and are considered to be ideal power sources for next-generation electric vehicles. The development of lithium-ion batteries with high energy density, high power density, and high safety has broad market prospects. High-nickel cathode materials (including NCA and NCM) have the advantages of high theoretical discharge specific capacity, good rate performance, and low cost, and are suitable for use as high-energy batteries for electric vehicles (EV), hybrid electric vehicles (HEV) and plug-in hybrid vehicles. Cathode material. [0003] At present, high-nick...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/366H01M4/505H01M4/525H01M4/485H01M4/628H01M4/624H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 温伟城严武渭杨顺毅吴小珍黄友元
Owner SHENZHEN CITY BATTERY NANOMETER TECH
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