A kind of preparation method of power ncm cathode material

A positive electrode material and power technology, applied in the field of preparation of power NCM positive electrode materials, can solve the problems of no significant improvement in material cycle performance, high requirements, and increased processing costs for alcohol recycling

Active Publication Date: 2018-01-05
CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The invention patent modifies the ternary cathode material by optimizing the coating process, which can effectively improve the first Coulombic efficiency and discharge specific capacity of the material, but it does not significantly improve the cycle performance of the material and other aspects, and the coating process requires a lot The use of alcohol requires high requirements for process equipment and workshop conditions (explosion-proof workshops), and the recycling of alcohol requires additional technical issues such as additional processing costs.

Method used

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  • A kind of preparation method of power ncm cathode material
  • A kind of preparation method of power ncm cathode material
  • A kind of preparation method of power ncm cathode material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] A kind of power NCM cathode material LiNi 0.33 co 0.36 mn 0.31 o 2 The preparation method comprises following process:

[0057] Step 1: Doped precursor Ni 0.33 co 0.36 mn .031 (OH) 2 preparation of

[0058] ⑴ Prepare the solution

[0059] Weigh NiSO according to the ratio of stoichiometric ratio 0.33:0.36:0.31 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O, according to finished LiNi 0.33 co 0.36 mn 0.31 o 2 The Al content in the medium is 750ppm, the Y content is 450ppm, and the Al(NO 3 ) 3 9H 2 O and Y (NO 3 ) 3 ·6H 2 O, formulated as Ni-Co-Mn-Al-Y-SO with a total metal ion content of 2mol / L for Ni, Co, and Mn 4 The mixed salt solution is recorded as solution a; NaOH is used as the precipitating agent and ammonia water is used as the complexing agent, and the precipitating agent solution and the complexing agent solution are mixed according to the ammonia-base molar ratio of 0.48, which is recorded as solution b, and the concentration of NaOH solutio...

Embodiment 2

[0082] A kind of power NCM cathode material LiNi 0.5 co 0.2 mn 0.295 Y 0.005 o 2 The preparation method comprises following process:

[0083] Step 1: Precursor Ni 0.5 co 0.2 mn 0.295 Y 0.005 (OH) 2 preparation of

[0084] ⑴ Prepare the solution

[0085] Weigh NiSO according to the ratio of stoichiometric ratio 0.5:0.2:0.295:0.005 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O, Y (NO 3 ) 3 ·6H 2 O, formulated as Ni-Co-Mn-Y-SO with a total metal ion content of 2mol / L for Ni, Co, Mn, and Y 4 The mixed solution is recorded as solution a; with NaOH as the precipitating agent and ammonia as the complexing agent, the precipitant solution and the complexing agent solution are mixed according to the ammonia-alkali molar ratio of 0.35, which is recorded as solution b, and the concentration of NaOH solution is 12mol / L. The mass fraction of ammonia water is 25%.

[0086] (2) The reaction process of the two solutions

[0087] The two solutions of a and b are pumped in paral...

Embodiment 3

[0106] A kind of power NCM cathode material LiNi 0.6 co 0.2 mn 0..19 Y 0.01 o 2 The preparation method comprises following process:

[0107] Step 1: Precursor Ni 0.6 co 0.2 mn 0.19 Y 0.01 (OH) 2 preparation of

[0108] ⑴ Prepare the solution

[0109] Weigh NiSO according to the ratio of stoichiometric ratio 0.6:0.2:0.19:0.01 4 ·6H 2 O. CoSO 4 ·7H 2 O, MnSO 4 ·H 2 O, Y (NO 3 ) 3 ·6H 2 O, formulated as Ni-Co-Mn-Y-SO with a total metal ion content of 2mol / L for Ni, Co, Mn, and Y 4 The mixed solution is recorded as solution a; with NaOH as the precipitating agent and ammonia as the complexing agent, the precipitant solution and the complexing agent solution are mixed according to the ammonia-alkali molar ratio of 0.30, which is recorded as solution b, and the concentration of NaOH solution is 12mol / L. The massfraction of ammoniacal liquor is 25%;

[0110] (2) The reaction process of the two solutions

[0111] The two solutions of a and b are pumped in paralle...

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Abstract

The invention relates to a preparation method for a dynamic NCM (nickel-cobalt-manganese) anode material. The invention belongs to the technical field of anode materials for lithium ion batteries. The preparation method includes: (Step 1) preparation of precursor NixCoyMnzM1-x-y-z(OH)2 (M is one or both of Al and Y): (1) NiSO4.6H2O, CoSO4.7H2O, MnSO4.H2O, Al(NO3)3.9H2O and Y(NO3)3.6H2O are weighed to prepare mixed salt solution; an NaOH precipitant and an ammonia complexing agent are mixed; (2) two solutions converge to react, so that NixCoyMnzMl-x-y-z(OH)2 suspension is obtained; (3) a solid and liquid are separated, and a filter cake is dried; (4) a magnetic substance is removed; (Step 2) lithium-containing sintering for the first time: Li2CO3 and NixCoyMnzMl-x-y-z(OH)2 powder are weighed, mixed and sintered; (Step 3) liquid phase coating of 0.5wt percent of Al(NO)3: Al(NO3)3 solution is prepared, a pH value is regulated by ammonia, and Al(OH)3 is coated by a liquid phase; suspension is filter-pressed, and a filter cake is dried; (Step 4) lithium-containing sintering for the second time: Li2CO3, an Al(OH)3-coated first sintered material and TiO2 are weighed, mixed and sintered; (Step 5) a magnetic substance is removed, and thereby the finished dynamic NCM anode material is obtained. The preparation method has the advantages of simple process, low material cost, good comprehensive electrochemical properties, suitability for mass operation and the like.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery positive electrode materials, and in particular relates to a preparation method of a power NCM positive electrode material. Background technique [0002] The cathode material is the core key material of the lithium-ion battery, which determines the performance and cost of the lithium-ion battery. The research hotspots of positive electrode materials that can be used for power batteries are mainly concentrated in the three major system materials of lithium manganese oxide (LMO), lithium iron phosphate (LFP), and ternary NCM (including NCA). [0003] Although ternary NCM power materials can basically meet the requirements of practical applications in terms of energy density, cycle performance, high and low temperature performance, and thermal safety, it is an indisputable fact that the battery cost is higher than that of LMO and LFP. Cost has become a key factor restricting the large-sc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 许国峰樊勇利李平李文升刘攀刘平
Owner CHINA ELECTRONIC TECH GRP CORP NO 18 RES INST
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