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Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery

A technology for lithium-ion batteries and cathode materials, which is applied in the field of lithium-ion batteries, single crystal ternary cathode materials and their preparation, can solve the problems of low discharge specific capacity of single crystal materials, lower capacity than polycrystalline materials, and high requirements for crushing and processing. Achieve the effect of favorable capacity, excellent specific capacity, and reduced mixed discharge of lithium and nickel

Pending Publication Date: 2022-04-12
CNGR ADVANCED MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, compared with conventional polycrystalline materials, single crystal materials still have many disadvantages: because single grains of single crystal materials are larger, Li + Diffusion is more difficult, so when charging and discharging in the same voltage range, the discharge specific capacity of single crystal materials is usually lower, the capacity performance is not as good as that of polycrystalline materials, and the rate performance is poor
At the same time, the preparation process of single crystal materials usually requires higher sintering temperature for more crystalline materials, the particle uniformity is poor, and the crushing processing requirements are high, which increases the production cost

Method used

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  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery
  • Monocrystal ternary positive electrode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0074] Another embodiment of the present invention provides a method for preparing a single crystal ternary positive electrode material, comprising the following steps:

[0075] Mixing the precursor of a single crystal ternary positive electrode material with a crystallinity of 60% to 70%, a lithium source and additives, and sintering in an oxygen-containing atmosphere to obtain a single crystal ternary positive electrode material with a crystallinity of 80% to 90% ;

[0076] Wherein, the single crystal ternary positive electrode material is LiNi x Co y Mn z O 2 , x+y+z=1, 0

[0077] Additives include compounds of Sr, Ca, Mg, Al, Zr, Y, Nb, W, B, the compounds include oxides, hydroxides of Sr, Ca, Mg, Al, Zr, Y, Nb, W, B And one or a combination of salts, such as SrO, SrO 2 , Sr(OH) 2 , SrCO 3 , SrCO 3 , SrNO 3 , SrCl 2 , SrSO 4 , SrS, CaCO 3 , MgCO 3 , Mg(OH) 2 , Mg(NO 3 ) 2 , ZrO, ZrCO 3 , B 2...

Embodiment 1

[0105] 1) The nickel, cobalt and manganese sulfate crystals with a molar ratio of 0.6:0.2:0.2 are configured into a uniform ternary metal salt mixed solution of 116g / L, and pure water and sodium hydroxide with a mass concentration of 32% are added to the reactor. The solution and 21% aqueous ammonia solution were configured as bottom liquid with pH 12.0, nitrogen protection was introduced to prevent oxidation, the stirrer was turned on, the rotating speed was 500r / min, and the temperature of the reaction kettle was raised to 60°C.

[0106] 2) the ternary metal salt mixed solution, the sodium hydroxide solution and the ammonia solution are fed into the reactor simultaneously, the flow rate of the ternary metal salt solution is 4L / h, and the flow rate of the sodium hydroxide solution is 2.0L / h, The flow rate of the aqueous ammonia solution is 0.3L / h, the reaction temperature is 60°C, the pH of the reaction system is controlled within the range of 11.9 to 12.0, a continuous proces...

Embodiment 2

[0111] 1) The nickel, cobalt, and manganese sulfate crystals with a molar ratio of 0.7:0.1:0.2 are configured into a uniform ternary metal salt mixed solution of 116 g / L, and pure water and 32% sodium hydroxide by mass are added to the reactor. The solution and the 21% aqueous ammonia solution were configured as bottom liquid with pH of 12.0, nitrogen protection was introduced to prevent oxidation, the stirrer was turned on, the rotating speed was 600r / min, and the temperature of the reaction kettle was raised to 60°C.

[0112]2) adding the ternary metal salt mixed solution, ammonia water and liquid caustic simultaneously into the reactor, the ternary metal salt flow rate is 5L / h, the liquid caustic flow rate is 2.0L / h, the ammonia water flow rate is 0.2L / h, and the reaction temperature The temperature is controlled at 60°C, the pH range of the reaction system is controlled to be 11.9-12.0, a continuous process is adopted, feeding and discharging are continuous, and the particl...

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Abstract

The invention provides a single-crystal ternary positive electrode material, a preparation method thereof and a lithium ion battery. Specifically, the single-crystal ternary positive electrode material is mainly obtained by sintering a precursor of the ternary positive electrode material, a lithium source and an additive, the crystallinity of the precursor is 60%-70%, and the crystallinity of the single crystal ternary positive electrode material is 80%-90%; the additive comprises one or a combination of oxides, hydroxides and salts of Sr, Ca, Mg, Al, Zr, Y, Nb, W and B. Compared with a polycrystalline material, the preparation method has the advantages that the defects in preparation cost and material performance of a single crystal material in the prior art are overcome, the prepared single crystal ternary positive electrode material has the advantages of high specific capacity, good rate capability, high cycle performance and the like, meanwhile, the size of single crystal particles is uniform, lithium-nickel mixing can be reduced, the stability of a layered structure can be enhanced, and the service life of the positive electrode material is prolonged. And the battery capacity exertion is facilitated.

Description

technical field [0001] The invention relates to the field of ternary materials, in particular to a single crystal ternary positive electrode material, a preparation method thereof, and a lithium ion battery. Background technique [0002] With the continuous development of the new energy industry, lithium-ion batteries have received more and more extensive and in-depth research. The quality of the cathode material is the key to determining the performance of the lithium-ion battery. The nickel-cobalt-manganese ternary cathode material has become an ideal battery material for electric vehicles because of its high theoretical energy density and long cycle life. [0003] Compared with the ternary cathode material with polycrystalline structure, the single crystal structure ternary cathode material has the following advantages: first, the specific surface is low, the structural stability is high, and the cycle stability is good; for the polycrystalline structure, with the cycle ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525C30B29/22C30B1/10
Inventor 阎晓静李魁訚硕郑佳玲李兵吴娟曾伟雄张平
Owner CNGR ADVANCED MATERIAL CO LTD
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