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Water washing method and system for high-nickel ternary cathode material

A positive electrode material and high-nickel technology, which is applied in the water washing method and system field of high-nickel ternary positive electrode materials, can solve the problems of high-nickel materials that cannot be industrialized, crystal lattice lithium precipitation, and battery cycle performance deterioration, etc., to achieve improvement Battery cycle performance, reduction of production, and the effect of inhibiting the precipitation of lithium on the surface of the material

Active Publication Date: 2022-05-10
贝特瑞(江苏)新材料科技有限公司
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  • Description
  • Claims
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Problems solved by technology

[0002] Ternary materials have increasingly attracted the attention of the industry due to their dual advantages of excellent comprehensive performance and lower cost, and have gradually surpassed lithium iron phosphate and lithium cobalt oxide to become the mainstream technical route. However, with the increase in the nickel content of ternary materials The content of residual alkali after sintering is getting higher and higher, which is one of the most important reasons why high-nickel materials have not been able to be industrialized.
[0003] At present, the industry mainly washes away the residual alkali on the surface of the material by adding the ternary cathode material to water, but the process of washing with water often leads to the precipitation of some lattice lithium on the surface of the material, and the battery cycle performance of the material deteriorates. A large amount of waste water will be generated, and the capital investment and environmental protection risks of waste water treatment are also relatively large

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  • Water washing method and system for high-nickel ternary cathode material
  • Water washing method and system for high-nickel ternary cathode material
  • Water washing method and system for high-nickel ternary cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] (1) Preparation of high-nickel ternary cathode material matrix: at room temperature, lithium hydroxide, Ni 0.8 co 0.1 mn 0.1 (OH) 2 The ternary precursor is added into the high-speed mixer at a molar ratio of 1.03:1, and mixed evenly to obtain a mixed powder. The mixed powder is sintered at a high temperature. The sintering temperature is 810°C and the sintering holding time is 10h. Oxygen, oxygen flow rate is 0.5m 3 / h, keep the oxygen concentration up to 99.5%, crush and sieve after cooling, you can get LiNi 0.8 co 0.1 mn 0.1 o 2 High nickel ternary cathode material matrix.

[0086] (2) Water-washed high-nickel ternary positive electrode material: a. Prepare a reaction kettle, add an electrolytic positive electrode and an electrolytic negative electrode into the reaction kettle, and a power supply is connected between the positive and negative electrodes, and the power supply voltage is set to 18V. b. According to deionized water, prepared LiNi 0.8 co 0.1 mn...

Embodiment 2

[0088] (1) Preparation of high-nickel ternary cathode material matrix: at room temperature, lithium hydroxide, Ni 0.8 co 0.1 mn 0.1 (OH) 2 The ternary precursor is added into the high-speed mixer at a molar ratio of 1.03:1, and mixed evenly to obtain a mixed powder. The mixed powder is sintered at a high temperature. The sintering temperature is 810°C and the sintering holding time is 15h. Oxygen, oxygen flow rate is 1.0m 3 / h, keep the oxygen concentration up to 99.5%, crush and sieve after cooling, you can get LiNi 0.8 co 0.1 mn 0.1 o 2 High nickel ternary cathode material matrix.

[0089] (2) Water-washed high-nickel ternary positive electrode material: a. Prepare a reaction kettle, add an electrolytic positive electrode and an electrolytic negative electrode into the reaction kettle, and a power supply is connected between the positive and negative electrodes, and the power supply voltage is set to 5V. b. According to deionized water, prepared LiNi 0.8 co 0.1 mn ...

Embodiment 3

[0091] (1) Preparation of high-nickel ternary cathode material matrix: at room temperature, lithium hydroxide, Ni 0.8 co 0.1 mn 0.1 (OH) 2 The ternary precursor is added into the high-speed mixer at a molar ratio of 1.03:1, and mixed evenly to obtain a mixed powder. The mixed powder is sintered at a high temperature. The sintering temperature is 850°C and the sintering holding time is 15h. Oxygen, oxygen flow rate is 0.8m 3 / h, keep the oxygen concentration up to 99.5%, crush and sieve after cooling, you can get LiNi 0.8 co 0.1 mn 0.1 o 2 High nickel ternary cathode material matrix.

[0092] (2) Water-washed high-nickel ternary positive electrode material: a. Prepare a reaction kettle, add electrolytic positive electrode and electrolytic negative electrode into the reaction kettle, and connect a power supply between the positive and negative electrodes, and set the power supply voltage to 36V. b. According to deionized water, prepared LiNi 0.8 co 0.1 mn 0.1 o 2 Add...

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Abstract

The invention discloses a water washing method and system for a high-nickel ternary positive electrode material. Wherein, the water washing method of the high-nickel ternary positive electrode material comprises the following steps: preparing a high-nickel ternary positive electrode material matrix; mixing the high-nickel ternary positive electrode material matrix with water to obtain an electrolyte solution; electrolysis to remove the residual alkali on the surface of the high-nickel ternary positive electrode material substrate. The technical solution of the invention can suppress the lithium precipitation on the surface of the material and reduce the amount of waste water produced.

Description

technical field [0001] The invention relates to the technical field of surface treatment of lithium-ion battery cathode materials, in particular to a water washing method and system for high-nickel ternary cathode materials. Background technique [0002] Ternary materials have increasingly attracted the attention of the industry due to their dual advantages of excellent comprehensive performance and lower cost, and have gradually surpassed lithium iron phosphate and lithium cobalt oxide to become the mainstream technical route. However, with the increase in the nickel content of ternary materials The content of residual alkali after sintering is getting higher and higher, which is also one of the most important reasons why high-nickel materials have not been able to be industrialized. The requirements for the production environment and process control ability are high, and the slurry is very easy to form jelly after absorbing water, which is very difficult in practical appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25F1/04C25F7/00
CPCC25F1/04C25F7/00
Inventor 廖世豪宋雄李家洪吴小珍杨顺毅
Owner 贝特瑞(江苏)新材料科技有限公司
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