Li-Ni-Co-Mn-V-O quaternary lithium ion battery positive electrode material and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of complex synthesis conditions, difficult control, poor cycle and rate performance, etc., achieve simple synthesis process and improve material stability , Good product stability

Inactive Publication Date: 2019-04-12
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0004] The present invention aims to solve the complex and difficult-to-control synthetic conditions of existing high-nickel ternary lithium-ion battery materials and the problems that the battery has poor cycle and rate performance under higher cut-off voltage conditions (4.6V) (cycle at 1C current density) After 100 times, the capacity retention rate is 84.5%; charge and discharge at a current density of 5C, only 109.4mAh / g discharge specific capacity), a new four-component uniform introduction of vanadium is proposed to form a new Lithium-ion battery positive electrode materials and synthesis methods, and further promote the commercial application level of lithium-ion batteries

Method used

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  • Li-Ni-Co-Mn-V-O quaternary lithium ion battery positive electrode material and preparation method thereof
  • Li-Ni-Co-Mn-V-O quaternary lithium ion battery positive electrode material and preparation method thereof
  • Li-Ni-Co-Mn-V-O quaternary lithium ion battery positive electrode material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) First calculate and weigh 7.688g nickel acetate, 1.795g cobalt acetate, 2.520g manganese acetate according to the molar ratio of each element as Ni:Co:Mn:V=0.6:0.14:0.2:0.06 (V6), and put them together Add it into deionized water to fully dissolve at 50°C, then add 0.362g of ammonium metavanadate to the above solution for dissolution, and finally make it to 100ml to prepare solution A;

[0021] (2) Add 7.459g of oxalic acid (15% excess) into deionized water to fully dissolve, and finally adjust the volume to 100ml to prepare solution B;

[0022] (3) Using solution B as the bottom liquid, add solution A to solution B at a rate of 6mL / min for stirring and mixing, the stirring rate is 700rpm, the temperature is 50°C, the pH is 6.5 (controlled by ammonia water), and the reaction time is 8h; After the end, the precipitate was suction filtered, washed, and dried to obtain a uniform co-precipitated spherical nickel-cobalt-manganese oxalate precursor. The drying temperature...

Embodiment 2

[0026] (1) First calculate and weigh 7.688g nickel acetate, 1.539g cobalt acetate, 2.524g manganese acetate according to the molar ratio of each element as Ni:Co:Mn:V=0.6:0.12:0.2:0.08 (V8), and put them together Add it into deionized water at 50°C to fully dissolve, then add 0.482g of ammonium metavanadate to the above solution for dissolution, and finally set the volume to 100ml to prepare solution A;

[0027] (2) Add 7.459g of oxalic acid (15% excess) into deionized water to fully dissolve, and finally adjust the volume to 100ml to prepare solution B;

[0028](3) Using solution B as the bottom liquid, add solution A to solution B at a rate of 7mL / min for stirring and mixing, the stirring rate is 700rpm, the temperature is 60°C, the pH is 6.5 (controlled by ammonia water), and the reaction time is 8h; After the end, the precipitate was suction filtered, washed, and dried to obtain a uniform co-precipitated spherical nickel-cobalt-manganese oxalate precursor. The drying tempe...

Embodiment 3

[0033] (1) First calculate and weigh 7.71g of nickel acetate, 1.285g of cobalt acetate, and 2.529g of manganese acetate according to the molar ratio of each element as Ni:Co:Mn:V=0.6:0.1:0.2:0.1 (V10). Add it into deionized water at 50°C to fully dissolve, then add 0.604g of ammonium metavanadate to the above solution for dissolution, and finally make it to 100ml to prepare solution A;

[0034] (2) Add 7.285g of oxalic acid (15% excess) into deionized water to fully dissolve, and finally adjust the volume to 100ml to prepare solution B;

[0035] (3) Using solution B as the bottom liquid, add solution A to solution B at a rate of 8mL / min for stirring and mixing, the stirring rate is 700rpm, the temperature is 70°C, the pH is 6.5 (controlled by ammonia water), and the reaction time is 8h; After the end, the precipitate was suction filtered, washed, and dried to obtain a uniform co-precipitated spherical nickel-cobalt-manganese oxalate precursor. The drying temperature was 90°C, ...

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Abstract

The invention provides a quaternary lithium ion battery positive electrode material (Li-Ni-Co-Mn-V-O). The invention also provides a corresponding synthesis method of the quaternary material. At the precursor synthesis stage, a vanadium element is introduced into a system by oxalic acid co-precipitation, a large amount of the V element can be enabled to be uniformly doped with a crystal to form anew quaternary positive electrode material, Mn can stably exist under an acid condition in a form of Mn<2+>, the reaction condition is easy to control, the synthesis process is simple, and the productis good in stability. In the quaternary lithium ion battery positive electrode material, the V is uniformly introduced in a fourth component, and the new Li-Ni-Co-Mn-V-O quaternary lithium ion battery positive electrode material is formed and can have favorable cycle and rate performance under a relatively high cutoff voltage (4.6V); and moreover, due to the reduction of Co content, the cost is reduced, the problem of an environment brought by Co is reduced, and thus, the commercial application value of a lithium ion battery is improved by the material.

Description

technical field [0001] The invention belongs to the technical field of cathode materials of lithium ion batteries. Background technique [0002] Due to its small size and high energy density, lithium-ion batteries are widely used in the fields of 3C and electric vehicles. From the perspective of the development trend of lithium-ion batteries, the development direction should be to reduce the cost of material synthesis and improve energy density and cycle stability. The cost and capacity constraints of lithium batteries are mainly concentrated on the positive electrode material. Compared to LiNiO 2 , LiMn 2 o 4 and LiCoO 2 , the ternary material (Li-Ni-Co-Mn-O) has high energy density, low cost and low toxicity, and is considered to be the most likely to replace LiCoO 2 Become one of the cathode materials for commercial lithium-ion batteries. As a kind of ternary system, LiNi 0.6 co 0.2 mn 0.2 o 2 (622) The ternary material increases the gram capacity of the materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/48H01M4/505H01M4/525H01M10/0525
CPCH01M4/362H01M4/483H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 李峻峰刘磊包珊珊何欢李平肖逸菲赖雪飞
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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