Production method of high-capacity and long-cycle lithium-rich 622-type ternary cathode material

A technology of positive electrode material and production method, which is applied in the production field of high-capacity and long-cycle lithium-rich 622 type ternary positive electrode material, can solve the problems of high-temperature cycle performance and high-temperature storage performance of nickel-cobalt lithium manganese oxide, and achieve improved electrochemical performance. Gram capacity, improved cycle performance, and complete crystal structure

Active Publication Date: 2018-04-06
HENAN FUSEN NEW ENERGY TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The application number is 201310726770.X, which discloses a preparation method of long-term high-temperature cycle nickel-cobalt-manganese oxide lithium NCM523 ternary material for lithium-ion batteries. In this method, aluminum salt or its oxide is added during the sintering process of the material, and the dry method is adopted. The mixture is evenly mixed before sintering, and the high-temperature performance of NCM523 is improved by Al ion doping, which effectively solves the problems of poor high-temperature cycle performance and high-temperature storage performance of nickel-cobalt lithium manganese oxide.

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Embodiment 1

[0031] The production method of high-capacity and long-cycle lithium-rich 622 type ternary positive electrode material comprises the following steps:

[0032] a. Raw material pretreatment: sieve the battery-grade lithium carbonate raw material to 150 mesh, and put the lithium carbonate under the sieve into production;

[0033] b. Ingredients: Weigh 75kg ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 , the weight of lithium carbonate is calculated and weighed according to the ratio of molar ratio Li: (Ni+Co+Mn)=1.08, and the titanium content mixed with nano-scale titanium dioxide is 75kg×1.065 (theoretical quality of the product corresponding to the ternary precursor of 75kg) 0.5% calculation, and then converted into the weight of titanium dioxide;

[0034] c. Mixing of raw materials: Put the weighed lithium carbonate, ternary precursor and titanium dioxide into the high-speed mixer in turn to mix, mix at low speed for 10 minutes, and mix at high speed for 90 minutes. Afte...

Embodiment 2

[0042] The production method of high-capacity and long-cycle lithium-rich 622 type ternary positive electrode material comprises the following steps:

[0043] a. Raw material pretreatment: sieve the battery-grade lithium carbonate raw material to 150 mesh, and put the lithium carbonate under the sieve into production;

[0044] b. Ingredients: Weighing 75kg ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 , the weight of lithium carbonate is calculated and weighed according to the ratio of molar ratio Li: (Ni+Co+Mn)=1.15, and the titanium content mixed with nano-titanium dioxide is 75kg×1.065 (theoretical quality of the product corresponding to 75kg ternary precursor) 2.3% calculation, and then converted into the weight of titanium dioxide;

[0045] c. Mixing of raw materials: Put the weighed lithium carbonate, ternary precursor and titanium dioxide into the high-speed mixer in turn to mix, mix at low speed for 10 minutes, and mix at high speed for 90 minutes. After mixing, ...

Embodiment 3

[0050] The production method of high-capacity and long-cycle lithium-rich 622 type ternary positive electrode material comprises the following steps:

[0051] a. Raw material pretreatment: sieve the battery-grade lithium carbonate raw material to 150 mesh, and put the lithium carbonate under the sieve into production;

[0052] b. Ingredients: Weighing 75kg ternary precursor LiNi 0.6 co 0.2 mn 0.2 (OH) 3 The weight of lithium carbonate is calculated and weighed according to the molar ratio Li: (Ni+Co+Mn) = 1.15, and the aluminum content mixed with nano-aluminum hydroxide is 0.9 (theoretical quality of the product corresponding to the ternary precursor body of 75kg) % calculation, and then converted to the weight of aluminum hydroxide;

[0053] c. Raw meal mixing: Pour the weighed lithium carbonate, ternary precursor and aluminum hydroxide into a high-speed mixer in turn to mix, mix at a low speed for 10 minutes, and mix at a high speed for 90 minutes. After mixing, check th...

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Abstract

The invention provides a production method for a high-capacity long-cycle lithium-rich type-622 ternary positive electrode material, and belongs to the technical field of positive electrode materials of lithium ion batteries. The production method for the high-capacity long-cycle lithium-rich type-622 ternary positive electrode material comprises the steps of adding 0.3-3.0% of metal oxide into lithium carbonate and a ternary precursor LiNi0.6Co0.2Mn0.2(OH)3, and performing water-washing, secondary sintering, grinding, deironing and mixing to finally obtain the ternary positive electrode material. According to the method, the electrochemical gram volume and cycle performance of the type-622 ternary positive electrode material are effectively improved; and the produced type-622 ternary positive electrode material is stable in quality, the 1C gram volume of a product is greater than 160mAh / g and maximally can reach 168mAh / g, and the 1C charge / discharge cycle performance is that the capacity fade is less than 20% after charge / discharge for 1,800-3,000 times.

Description

technical field [0001] The invention belongs to the technical field of preparation of positive electrode materials of lithium ion batteries, and in particular relates to a production method of high-capacity and long-cycle lithium-rich 622 type ternary positive electrode materials. Background technique [0002] Lithium-ion batteries are a new type of power source developed in recent years. Compared with other rechargeable secondary batteries, lithium-ion batteries have the advantages of high voltage, high specific energy, long charge and discharge life, no memory effect, and no pollution. Therefore, It is not only widely used in portable electronic equipment (such as mobile phones, digital cameras and laptop computers, etc.), but also has broad application prospects in the fields of large and medium-sized electric equipment such as electric vehicles, electric bicycles, and electric tools. A hotspot of phase research and development. [0003] Lithium nickel cobalt manganese o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/364H01M4/505H01M4/525H01M4/628H01M10/0525Y02E60/10
Inventor 曹长城高云
Owner HENAN FUSEN NEW ENERGY TECH
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