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Preparation method of nickel-cobalt-manganese ternary anode material

A cathode material, nickel-cobalt-manganese technology, which is applied in the field of preparation of nickel-cobalt-manganese ternary cathode materials, can solve the problems of small electric capacity and short life of cathode materials, and achieve easy industrialization, high electric capacity, and high first charge times. rate effect

Inactive Publication Date: 2017-09-22
四川新锂想能源科技有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is that the nickel-cobalt-manganese ternary positive electrode material in the prior art is easy to catalyze the decomposition of the electrolyte to generate gas during the cation mixing and circulation process, resulting in a small capacitance and short life of the positive electrode material. The purpose is to Provide the preparation method of nickel-cobalt-manganese ternary positive electrode material. The nickel-cobalt-manganese ternary positive electrode material is prepared by improving the raw material selection of additives and coating agents, mixing and doping by wet method, passing an appropriate amount of oxygen, and adopting a secondary roasting process. With high capacity and first charge rate, it has high cycle life

Method used

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Embodiment 1

[0024] The preparation process of the nickel-cobalt-manganese ternary positive electrode material provided by the invention is as follows figure 1 As shown, the specific operation steps are:

[0025] Step A, raw material pretreatment: sieve the lithium hydroxide raw material through a 200-mesh sieve to obtain particles, and control the particle size D50 = 3-8 μm for later use;

[0026] Step B, pre-doping treatment: the lithium hydroxide raw material particles obtained in the step A, the ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 and Mg(NO 3 ) 2 Add distilled water and use a high-speed mixer for liquid phase mixing. After mixing evenly, the liquid phase mixture is directly ball milled for 1 hour. After ball milling, it is dried in a pan dryer at a temperature of 90°C to obtain a mixed powder; The molar ratio to (Ni+Co+Mn) is 1.1:1, Mg(NO 3 ) 2 The added mass is 0.1% of the theoretical product mass;

[0027] Step C, primary sintering: Carry out primary sintering of...

Embodiment 2

[0031] The preparation process of the nickel-cobalt-manganese ternary positive electrode material provided by the invention is as follows figure 1 As shown, the specific operation steps are:

[0032] Step A, raw material pretreatment: sieve the lithium hydroxide raw material through a 200-mesh sieve to obtain particles, and control the particle size D50 = 3-8 μm for later use;

[0033] Step B, pre-doping treatment: the lithium hydroxide raw material particles obtained in the step A, the ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 , Al(NO 3 ) 3 and NH 4 Add F into distilled water and use a high-speed mixer to carry out liquid phase mixing. After mixing evenly, the liquid phase mixture is directly ball milled for 3 hours. After ball milling, it is dried in a pan dryer at a temperature of 120°C to obtain a mixed powder; The molar ratio of Li to (Ni+Co+Mn) is 1.12:1, Al(NO 3 ) 3 The added mass is 0.6% of the theoretical product mass, NH 4 The added quality of F is 0....

Embodiment 3

[0038] Step A, raw material pretreatment: sieve the lithium hydroxide raw material through a 200-mesh sieve to obtain particles, and control the particle size D50 = 3-8 μm for later use;

[0039] Step B, pre-doping treatment: the lithium hydroxide raw material particles obtained in the step A, the ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 and Al(NO 3 ) 3 Add absolute ethanol and use a high-speed mixer to carry out liquid phase mixing. After mixing evenly, the liquid phase mixture is directly ball milled for 4 hours. After the ball milling, it is dried in a disc dryer at a temperature of 100°C to obtain a mixed powder; The molar ratio of Li to (Ni+Co+Mn) is 1.20:1, Al(NO 3 ) 3 The added mass is 0.8% of the theoretical product mass;

[0040] Step C, primary sintering: Carry out primary sintering of the mixed powder roller kiln obtained in the above step B, heat up at 10°C / min to 850°C for 5 hours, continuously feed oxygen during the sintering process, and the flow r...

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Abstract

The invention discloses a preparation method of a nickel-cobalt-manganese ternary anode material. The method comprises the following preparation steps: step A, screening a lithium source to obtain granules, and controlling the granularity D50 to be 3-8 mum for later use; step B, sequentially performing liquid phase mixing, wet ball milling and drying treatment on the lithium source granules obtained in step A, a ternary precursor LiNi0.6Co0.2Mn0.2(OH)3 and an additive to obtain mixed powder; step C, roasting the mixed powder obtained in step B for 5-15 h at the temperature of 500-850 DEG C; step D, mixing the primary roasted material obtained in step C with a coating agent, and performing ball milling to obtain a mixed material; and step E, performing secondary roasting on the mixed material obtained in step D for 10-20 h at the temperature of 750-950 DEG C to obtain the nickel-cobalt-manganese ternary anode material. The nickel-cobalt-manganese ternary anode material prepared by improving the raw material selection of the additive and the coating agent, introducing appropriate oxygen and adopting a two-roasting process has relatively high capacitance and first charge rate and long service life cycle.

Description

technical field [0001] The invention relates to an electrode material, in particular to a preparation method of a nickel-cobalt-manganese ternary positive electrode material. Background technique [0002] Lithium-ion batteries have been widely used in electronic products such as laptop computers and mobile phones, and are used as mainstream energy storage devices in electric vehicles to cope with the current excessive carbon dioxide emissions and reduced energy supply. At present, the main research is focused on positive electrode materials with superior safety and high energy density, and lithium cobalt oxide, as the most representative and commercial positive electrode material due to its high cost, high toxicity and low capacity, is now Difficult to adapt to the demands of today's batteries. Many researchers have focused on layered LiNi 1-x-y co x mn y o 2 (x+y<1) positive electrode material, which has higher specific capacity and lower cost. In particular, nicke...

Claims

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Application Information

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IPC IPC(8): H01M4/1391H01M4/505H01M4/525
CPCH01M4/1391H01M4/505H01M4/525Y02E60/10
Inventor 孙文仙岳波向中林王俊安李延俊
Owner 四川新锂想能源科技有限责任公司
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