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Low-cobalt high-power ternary positive electrode material and preparation method thereof

A positive electrode material and high-power technology, applied in chemical instruments and methods, electrical components, battery electrodes, etc., can solve the problems of high raw material prices, large negative impact on power performance, high cobalt content, etc., to reduce cobalt content and enhance the interface Stability, effect of increasing specific surface area

Pending Publication Date: 2021-10-12
JINGMEN GEM NEW MATERIAL
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  • Description
  • Claims
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Problems solved by technology

[0003] In view of the problems in the prior art that the cobalt content of the power type ternary material is relatively high, the price of raw materials is relatively high, and the power performance is greatly negatively affected after the cobalt content is reduced, the present invention provides a low-cobalt high-power ternary positive electrode with excellent performance Materials and their preparation methods

Method used

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  • Low-cobalt high-power ternary positive electrode material and preparation method thereof
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  • Low-cobalt high-power ternary positive electrode material and preparation method thereof

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preparation example Construction

[0023] The preparation method of low-cobalt high-power type ternary cathode material comprises the following steps:

[0024] (1) The molar ratio of preparing nickel ion and manganese ion is (1~99):(1~99) nickel and manganese mixed binary solution, the concentration sum of nickel ion and manganese ion in nickel and manganese mixed binary solution 0.5mol / L~2.5mol / L; prepare 0.5mol / L~2.5mol / L cobalt solution; industrial liquid alkali with a concentration of 20%~32% as the first precipitant solution; prepare 0.5mol / L~2mol / L of ammonium bicarbonate or sodium carbonate solution as the second precipitant solution; prepare ammonia water with a concentration of 10% to 20% as the complexing agent solution.

[0025] (2) Feed nitrogen into the reaction kettle with the bottom liquid as a protective gas, and start stirring the reaction kettle; the flow rate of nitrogen gas is 0.5m 3 / h~3m 3 / h; the amount of bottom liquid added is 1 / 2~4 / 5 of the volume of the reactor; the bottom liquid i...

Embodiment 1

[0030] Prepare a mixed binary solution of nickel and manganese with a molar ratio of nickel ions and manganese ions of 63:37. The sum of the concentrations of nickel ions and manganese ions in the mixed binary solution of nickel and manganese is 0.5mol / L; prepare 0.5mol / L the cobalt solution; the concentration is 20% industrial liquid alkali as the first precipitant solution; the preparation of 0.5mol / L ammonium bicarbonate is as the second precipitant solution; the preparation concentration is 10% ammonia water as the complexing agent solution.

[0031] Feed nitrogen into the reaction kettle with bottom liquid as a protective gas, start stirring the reaction kettle, the stirring speed is 500rpm; the flow rate of nitrogen gas is 3m 3 / h; the amount of bottom liquid added is 1 / 2 of the volume of the reactor; the bottom liquid includes ammonia water and industrial liquid caustic soda, the ammonia concentration in the bottom liquid is 10g / L, the pH of the bottom liquid is 12.2 to ...

Embodiment 2

[0036] Prepare a mixed binary solution of nickel and manganese with a molar ratio of nickel ions and manganese ions of 87:13. The sum of the concentrations of nickel ions and manganese ions in the mixed binary solution of nickel and manganese is 1.5mol / L; prepare 1.5mol / L the cobalt solution; the concentration is 32% of the industrial liquid alkali as the first precipitant solution; the preparation of 1.5mol / L ammonium bicarbonate as the second precipitant solution; the preparation concentration of 15% ammonia as the complexing agent solution.

[0037] Introduce nitrogen into the reaction kettle with bottom liquid as protective gas, start stirring the reaction kettle, the stirring speed is 600rpm; the flow rate of nitrogen gas is 1.5m 3 / h; the addition of the bottom liquid is 2 / 3 of the volume of the reactor; the bottom liquid includes ammonia water and industrial liquid alkali, the ammonia concentration in the bottom liquid is 5g / L, the pH of the bottom liquid is 12.0-12.2, a...

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Abstract

The present invention discloses a low-cobalt high-power ternary positive electrode material and a preparation method thereof. The chemical formula of the low-cobalt high-power ternary positive electrode material is LiNixCoyMnzO2, wherein the elements are 0 < x <= 1, 0 < y <= 0.15, 0 < z <= 1, and x+y+z = 1. The preparation method of the material comprises the following steps of preparing a nickel and manganese mixed binary solution and a cobalt solution; introducing nitrogen into a reaction kettle with the base solution, and starting the reaction kettle for stirring; simultaneously injecting the nickel and manganese mixed binary solution, the industrial caustic soda liquid, a precipitator solution and a complexing agent solution into the reaction kettle for a co-precipitation reaction until the D50 of the material in the reaction kettle reaches 2.4-3.4 [mu] m, then stopping feeding, simultaneously adding a cobalt solution and an ammonium bicarbonate or sodium carbonate solution into the reaction kettle, and stopping feeding after the reaction to obtain slurry; and performing centrifugal washing, drying, screening and iron removal on the slurry, mixing with a lithium source, and then sintering to obtain the low-cobalt high-power ternary positive electrode material. The prepared material is excellent in power performance.

Description

technical field [0001] The invention belongs to the technical field of positive electrode materials for lithium ion batteries, and in particular relates to a low-cobalt high-power ternary positive electrode material and a preparation method thereof. Background technique [0002] Due to factors such as the price of cobalt, decobaltization of cathode materials has become a definite trend. The reduction of cobalt content will bring negative effects such as the reduction of rate performance, making it difficult to reduce the cobalt content of high-power ternary cathode materials. At present, under the same ratio of metal elements, the power performance of the material is generally improved by increasing the specific surface area of ​​the material. The patent "A High-Power Ternary Material Precursor and Preparation Method" (Application Publication No.: CN112047397A) provides a high-power ternary material precursor and a preparation method, which is prepared by special process co...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M10/0525C01G53/00
CPCH01M4/505H01M4/525H01M10/0525C01G53/50C01P2006/40C01P2004/61Y02E60/10
Inventor 许开华李聪张坤杨幸孙海波薛晓斐黎俊
Owner JINGMEN GEM NEW MATERIAL
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