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Battery cathode material, preparation method thereof and lithium ion battery

A battery cathode and substrate technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle performance, low price, damage to the surface structure of materials, etc., and achieve the effect of good high temperature cycle performance

Inactive Publication Date: 2015-12-16
NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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AI Technical Summary

Problems solved by technology

[0002] Nickel cobalt lithium manganese oxide (NCM) ternary material has high reversible capacity (theoretical capacity reaches 274mAh / g), excellent safety performance and low price, and has received extensive attention from researchers, but this material is widely used in Poor cycle performance at high temperature limits its application in the direction of electric vehicles
[0003] Recent studies have shown that during the tableting process of NCM ternary materials in the preparation of batteries, the secondary particle balls of NCM materials are easily broken due to the rolling of the pole pieces, destroying the surface structure of the materials, and the NCM ternary materials are in the cycle process. Due to the dissolution of its metal ions, the surface structure of the material will be further damaged; thus, the lithium-ion battery prepared by the NCM material will be attenuated during the high-temperature cycle.
At present, the method to improve the fragmentation of materials due to rolling is to mix large and small particles, increase the bulk density of the material itself, and increase its compression resistance, but this method still has the problem of fragmentation of local particles; the current solution for metal ions The method of dissolution is to coat the metal oxide on the surface of NCM to alleviate the corrosion of the active material by the electrolyte, but this method cannot inhibit the dissolution of metal ions caused by the structural collapse of the NCM material itself during the long cycle at high temperature
[0004] Therefore, the prior art urgently needs to solve the problem of crushing and crushing of the positive electrode material during the battery preparation process, as well as improve the structural stability of the positive electrode material and prevent the electrolyte from corroding the positive electrode material. The prior art requires a new positive electrode material, Lithium-ion batteries prepared with this positive electrode material have good high-temperature cycle performance

Method used

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  • Battery cathode material, preparation method thereof and lithium ion battery
  • Battery cathode material, preparation method thereof and lithium ion battery
  • Battery cathode material, preparation method thereof and lithium ion battery

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preparation example Construction

[0052] The present invention provides a method for preparing the positive electrode material of a battery described in the above technical solution, comprising:

[0053] The oxide of nickel-cobalt-manganese with a single crystal structure and the lithium salt are first calcined and then kept warm to obtain an intermediate product. The temperature of the first calcination is 500°C to 800°C; the oxide of nickel-cobalt-manganese has the formula Compounds shown in II:

[0054] Ni x co y mn (1-x-y) m a o 2 Formula II;

[0055] Carrying out the second calcination of the intermediate product and then keeping it warm to obtain a substrate with a single crystal structure, the temperature of the second calcination is 801°C to 1100°C;

[0056] Described substrate is the compound shown in formula I:

[0057] LiNi x co y mn (1-x-y) m a o 2 Formula I;

[0058] In formula I and formula II, 0

[0059] M is one or more of Mg, Ti, Zr, Sr and Al;...

Embodiment 1

[0101] Dissolve cobalt sulfate, nickel sulfate, and manganese sulfate in water according to the molar ratio of Ni, Co, and Mn at a ratio of 1:1:1, and make a 1mol / L mixed solution, mix 0.1mol / L titanium nitrate aqueous solution with the above The mixed solution is fed into the reaction kettle in parallel through the respective pipelines to carry out coprecipitation reaction, and the pH value of the coprecipitation reaction is controlled to be 11.2, and the obtained coprecipitation reaction product is stirred, washed, and dried to obtain Ni with a D50 particle size of 3 μm 1 / 3 co 1 / 3 mn 1 / 3 Ti 0.01 (OH) 2 Hydroxide of nickel cobalt manganese;

[0102] Sintering the nickel-cobalt-manganese hydroxide at 600°C for 6h to obtain Ni 1 / 3 co 1 / 3 mn 1 / 3 Ti 0.01 o 2 Oxides of nickel, cobalt and manganese;

[0103] The oxide of described nickel-cobalt-manganese is ball-milled with lithium carbonate, and the consumption of the oxide of described nickel-cobalt-manganese and lithium...

Embodiment 2

[0109]Dissolve cobalt sulfate, nickel sulfate, and manganese sulfate in water according to the molar ratio of Ni, Co, and Mn at a ratio of 5:2:3 to form a mixed solution of 2 mol / L, and mix 0.1 mol / L zirconium nitrate aqueous solution with the above-mentioned The mixed solution is fed into the reaction kettle in parallel through the respective pipelines to carry out the coprecipitation reaction, and the pH value of the coprecipitation reaction is controlled to be 11. The obtained coprecipitation reaction product is stirred, washed and dried to obtain Ni 0.5 co 0.2 mn 0.3 Zr 0.01 (OH) 2 Hydroxide of nickel cobalt manganese;

[0110] Sintering the nickel-cobalt-manganese hydroxide at 600°C for 6h to obtain Ni 0.5 co 0.2 mn 0.3 Zr 0.01 o 2 Oxides of nickel, cobalt and manganese;

[0111] The oxide of described nickel-cobalt-manganese and lithium carbonate are ball-milled and mixed, and the consumption of the oxide of described nickel-cobalt-manganese and lithium carbonat...

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Abstract

The invention provides a battery cathode material. The battery cathode material comprises a single-crystal structurized substrate and a coating layer, wherein the coating layer coats the surface of the substrate and is aluminum oxide or zirconium oxide. The battery cathode material provided by the invention comprises the single-crystal structurized substrate; by the single-crystal structurized substrate, particle breakage caused by positive sheet grinding during the battery fabrication process can be prevented; and meanwhile, with the joint effects of a doping element in the battery cathode material and the coating layer, the structural stability of the cathode material can be improved, the corrosion of an electrolyte to the material is relieved, and a lithium ion battery prepared from the cathode material has favorable high-temperature cycle performance. The invention also provides a preparation method of the battery cathode material and the lithium ion battery.

Description

technical field [0001] The invention relates to the technical field of batteries, in particular to a battery cathode material, a preparation method thereof and a lithium ion battery. Background technique [0002] Nickel cobalt lithium manganese oxide (NCM) ternary material has high reversible capacity (theoretical capacity reaches 274mAh / g), excellent safety performance and low price, and has received extensive attention from researchers, but this material is widely used in Poor cycle performance at high temperature limits its application in the direction of electric vehicles. [0003] Recent studies have shown that during the tableting process of NCM ternary materials in the preparation of batteries, the secondary particle balls of NCM materials are easily broken due to the rolling of the pole pieces, destroying the surface structure of the materials, and the NCM ternary materials are in the cycle process. Due to the dissolution of its metal ions, the surface structure of ...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M4/62H01M10/0525
CPCH01M4/483H01M4/485H01M4/502H01M4/505H01M4/523H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 毛秦钟佘圣贤黄连友陈炼袁徐俊
Owner NINGBO RONBAY LITHIUM BATTERY MATERIAL CO LTD
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