A kind of preparation method of lithium-rich manganese-based lithium secondary battery cathode material

A lithium-rich manganese-based lithium and lithium secondary battery technology, applied in the field of lithium secondary battery material preparation, to achieve the effects of suppressing voltage decay, improving cycle stability, and increasing capacity

Active Publication Date: 2022-04-01
广东聚圣科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to solve the above problems, researchers have done a series of modification work on lithium-rich manganese-based cathode materials, among which cation doping is one of the most effective ways to suppress capacity / voltage fading, which stabilizes the crystal structure and improves lithium ion migration. rate, thereby improving the electrochemical performance of the material, but there is still room for improvement in the effect of doping improvement

Method used

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  • A kind of preparation method of lithium-rich manganese-based lithium secondary battery cathode material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] According to the general chemical formula (Mn 1 Ni 0.6 co 0.3 )CO 3 1g powder of the precursor of the lithium secondary battery cathode material and 0.04744g antimony trioxide Sb 2 o 3 , 0.006108g titanium dioxide Ti 2 o 3 and 0.4261g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 350r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 880°C at a rate of 1°C / min ℃, heat preservation for 15 hours, and naturally cooled to room temperature to obtain a positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material.

[0012] The X-ray diffractometer results of the positive electrode material prepared by the above method are as follows: figure 1 As shown in the figure, it can be seen that the material conforms to the crystal peak of lithium-rich materials, which conforms to α~NaFeO 2 stru...

Embodiment 2

[0016] According to the general chemical formula (Mn 1 Ni 0.7 co 0.2 )CO 3 1g powder and 0.03668g diyttrium trioxide Y 2 o 3 , 0.013847g lanthanum trioxide La 2 o 3 and 0.4293g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 250r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 900°C at a rate of 1°C / min ℃, keep warm for 15h, and cool down to room temperature naturally. That is, the positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material is obtained. According to the battery test conditions of Example 1, the first cycle efficiency of the battery of the material of this example is 80%, the capacity retention rate after 100 cycles is 89%, and the average voltage retention rate is 95%.

Embodiment 3

[0018] According to the general chemical formula (Mn 1 Ni 0.8 co 0.1 )CO 3 The precursor of the lithium secondary battery positive electrode material and 0.00702g lanthanum trioxide La 2 o 3 , 0.0058735g scandium trioxide Sc 2 o 3 and 0.4932g lithium carbonate Li 2 CO 3 Stir and mix at a stirring speed of 500r / min until the powder color is a single color, raise the temperature to 500°C at a rate of 2°C / min in an air atmosphere, keep it warm for 5 hours, and then raise the temperature to 880°C at a rate of 1°C / min ℃, keep warm for 15h, and cool down to room temperature naturally. That is, the positive trivalent ion co-doped modified lithium-rich manganese-based positive electrode material is obtained. According to the battery test conditions of Example 1, the first cycle efficiency of the battery of the material of this example is 85%, the capacity retention rate after 100 cycles is 91%, and the average voltage retention rate is 95%.

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Abstract

The invention provides a method for preparing the positive electrode material of lithium-rich manganese-based lithium secondary battery, which comprises preparing precursor powder, lithium-containing compound powder, a certain amount of positive trivalent state M1 compound powder and positive trivalent state M2 compound powder. The body is stirred and mixed at a stirring speed of 20-1000 r / min, then heat-treated at a temperature of 300-600°C for 3-7 hours, and then heated at a temperature of 700-1000°C for 8-20 hours. The doped lithium-rich manganese-based cathode material obtained by the preparation method of the invention has high average working voltage, high rate performance and cycle performance.

Description

technical field [0001] The invention relates to a preparation method of a lithium secondary battery material, in particular to a preparation method of a lithium-rich manganese-based positive electrode material. Background technique [0002] The positive electrode material is the most critical component of lithium-ion batteries, it is the + The source directly determines its energy density and is also an important factor affecting battery power density, cycle life and safety performance. The lithium-rich manganese-based layered cathode material first proposed by Dahn and his colleagues and Thackeray et al. has the advantages of high discharge specific capacity higher than 250mAh / g and high energy density, and is regarded as the main material for the next generation of power batteries. But its average operating voltage of 3.5V is lower than 3.8V of the high-nickel ternary material. In addition, its discharge voltage decays significantly during cycling, leading to a further d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58H01M10/052
CPCY02E60/10
Inventor 韦伟峰张春晓王天硕江文俊文建超文建豪
Owner 广东聚圣科技有限公司
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