Positive electrode material with improved first discharge capacity and preparation method thereof

A cathode material and discharge capacity technology, applied in the field of materials research, can solve the problem of poor material cycle performance, achieve the effect of excellent performance, simple preparation process, and increase the discharge capacity in the first week

Inactive Publication Date: 2020-05-15
TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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AI Technical Summary

Problems solved by technology

[0005] Patent 201710694393.4 reports a method of adding Li in proportion to the positive active material 3 V 2 (PO 4 ) 3 A method for improving the first discharge efficiency, in which Li 3 V 2 (PO 4 ) 3 It can improve the first charge and discharge efficiency, but because it is not coated on the surface of the active material, the cycle performance of the material is poor

Method used

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  • Positive electrode material with improved first discharge capacity and preparation method thereof
  • Positive electrode material with improved first discharge capacity and preparation method thereof
  • Positive electrode material with improved first discharge capacity and preparation method thereof

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preparation example Construction

[0037] The preparation method of the positive electrode material for improving the first discharge capacity comprises the following steps:

[0038] (1) After uniformly mixing the positive electrode material matrix and the lithium source, sintering to obtain a sintered material;

[0039] (2) Coating the sintered material obtained in step (1) with a coating agent.

[0040] Step (1) is lithium replenishment treatment, in step (1),

[0041] The positive electrode material matrix refers to a material that can be used as the positive electrode of a battery after sintering. The positive electrode material matrix includes any or a combination of NCM ternary material, NCA ternary material, lithium cobaltate, lithium iron phosphate, lithium manganate; preferably NCM ternary material-622 single crystal material (LiNi 0.6 co 0.2 mn 0.2 o 2 ).

[0042] The lithium source includes any or a combination of lithium hydroxide, lithium carbonate, lithium nitrate, lithium chloride, and lith...

Embodiment 1

[0087] (1) Take the positive electrode material LiNi 0.6 co 0.2 mn 0.2 o 2 Base M=200g, add LiOH 0.345g according to Li / M=0.05%, after mixing evenly, raise the obtained mixture sample from room temperature to 700°C in air atmosphere for secondary sintering, the heating rate is 5°C / min;

[0088] The sintering process is divided into two stages. Firstly, the temperature is raised to 500°C for 1 hour, then the temperature is raised to 700°C for 5 hours, and finally the temperature is naturally lowered. Pass the material obtained by secondary sintering through a 300-mesh sieve for later use.

[0089] (2) The material obtained in (1) is subjected to nano-H 3 BO 3 Dry coating. First, weigh 120g of the material in (1), and calculate the mass of the coating agent required based on the boron coating amount of 0.03% to be 0.206g. After mixing evenly, the mixture sample is sintered three times in an air atmosphere at 300°C, with a heating rate of 5 ℃ / min, holding time 5h, and fina...

Embodiment 2

[0091] (1) Take the positive electrode material LiNi 0.6 co 0.2 mn 0.2 o 2 Base M=200g, LiOH 0.345g was added according to Li / M=0.05%. After mixing evenly, the obtained mixture sample was raised from room temperature to 700°C in an air atmosphere for secondary sintering at a heating rate of 5°C / min. The sintering process is divided into two stages. Firstly, the temperature is raised to 500°C for 1 hour, then the temperature is raised to 700°C for 5 hours, and finally the temperature is naturally lowered. The material obtained by secondary sintering is passed through a 300-mesh sieve for subsequent use;

[0092] (2) The material obtained in (1) is subjected to nano-H 3 BO 3 Dry coating. First, weigh 120g of the material in (1), and calculate the mass of the coating agent required based on 0.05% of the boron coating amount to be 0.343g. After mixing evenly, the mixture sample is sintered three times in an air atmosphere at 300°C, with a heating rate of 5 ℃ / min, holding ti...

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Abstract

The invention provides a positive electrode material with improved first discharge capacity and a preparation method of the positive electrode material. The positive electrode material is prepared from a positive electrode material matrix, a lithium source and a coating agent. The first discharge capacity is improved by improving the first charge-discharge efficiency and the first-week charge capacity, and the cycle performance of the positive electrode material is effectively improved. The preparation method provided by the invention adopts a solid-phase method, is simple in preparation process and is beneficial to industrial production.

Description

technical field [0001] The invention relates to a battery positive electrode material, which belongs to the field of material research; in particular, it relates to a positive electrode material for improving the first discharge capacity and a preparation method thereof. Background technique [0002] As an important application field of lithium-ion batteries, new energy vehicles have attracted more and more attention. With the continuous acceleration of the industrialization of new energy vehicles, higher requirements have been placed on the positive electrode materials of lithium-ion batteries: by 2020, the energy density of batteries must reach Above 300Wh / Kg, the specific energy of the system reaches above 260Wh / Kg, and the cost needs to be reduced to below 1 yuan / Wh; and by 2025, the battery energy density is required to reach above 400Wh / Kg, and the system energy density needs to reach above 350Wh / Kg. Therefore, low cost and high energy density are the research hotspots...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/58H01M4/62H01M10/0525
CPCH01M4/366H01M4/485H01M4/582H01M4/5825H01M4/62H01M10/0525Y02E60/10
Inventor 吴朋朋周宏宝张岩罗迪迪张臻伟凌仕刚周玉林沙金苏迎春
Owner TIANJIN GUOAN MGL NEW MATERIALS TECH CO LTD
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