Manganese pyrophosphate polyanionic lithium battery negative electrode material and preparation method thereof

A manganese pyrophosphate poly and anionic technology, applied in battery electrodes, secondary batteries, chemical instruments and methods, etc., can solve the problems of unfavorable large-scale production, high equipment requirements, high energy consumption, and achieve single-phase and crystalline The effect of good performance, high product purity and high discharge specific capacity

Pending Publication Date: 2019-09-10
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The process of this method is relatively complicated, and the required equipment is high. Phosphate is used as the phosphorus source, and traditional high-temperature sintering is used to crack the phosphate into pyrophosphate at high temperature. This process requires a lot of energy and high energy consumption. Production High cost, not conducive to large-scale production
[0007] At present, there are few reports about manganese pyrophosphate polyanion lithium battery anode materials

Method used

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  • Manganese pyrophosphate polyanionic lithium battery negative electrode material and preparation method thereof
  • Manganese pyrophosphate polyanionic lithium battery negative electrode material and preparation method thereof
  • Manganese pyrophosphate polyanionic lithium battery negative electrode material and preparation method thereof

Examples

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Embodiment 1

[0039]The specific operation steps of the present embodiment are as follows: a concentration of 0.005mol / L manganese acetate ethanol solution is slowly added dropwise to a concentration of 0.0025mol / L pyrophosphoric acid ethanol solution; Stirring and reacting at a stirring speed of 60 rpm for 30 minutes; centrifuging the obtained precipitate, washing the obtained solid material with alcohol, and drying in an oven at 100° C. for 8 hours to obtain a manganese pyrophosphate polyanion lithium battery negative electrode material.

[0040] see figure 1 and figure 2 It can be seen that the manganese pyrophosphate polyanion lithium battery negative electrode material prepared in Example 1 has good single-phase and crystallinity, stable structure, and stable electrochemical performance.

[0041] see image 3 , Figure 4 and Figure 5 , the manganese pyrophosphate polyanion lithium battery negative electrode material prepared in this example has a massive structure and is composed...

Embodiment 2

[0043] The specific operation steps of this embodiment are as follows: Slowly add the manganese acetate ethanol solution with a concentration of 0.02 mol / L into the ethanol solution with a concentration of 0.01 mol / L pyrophosphoric acid. Manganese acetate and pyrophosphoric acid were reacted with stirring at a stirring speed of 60 rpm for 30 minutes at a molar ratio of 1:1. The obtained mixed solution is centrifuged, washed with alcohol, and dried in an oven to obtain a block-shaped manganese pyrophosphate polyanion lithium battery negative electrode material.

[0044] see Figure 6-8 It can be seen that the manganese pyrophosphate polyanion lithium battery negative electrode material prepared in Example 2 has good single-phase and crystallinity, stable structure, and stable electrochemical performance.

[0045] Further, the obtained massive manganese pyrophosphate polyanion lithium battery negative electrode material was dried, that is, dried at 100°C for 8 hours, and then s...

Embodiment 3

[0047] The specific operation steps of this embodiment are as follows: Slowly add the manganese acetate ethanol solution with a concentration of 0.02 mol / L into the ethanol solution with a concentration of 0.01 mol / L pyrophosphoric acid. Then add 0.14191g graphene oxide (added by 5% of the mass of the product), manganese acetate and pyrophosphoric acid in a molar ratio of 1:1, stir and react at a stirring speed of 60 rpm for 30 minutes, and carry out the mixed solution obtained centrifuging, washing with alcohol, and drying in an oven to obtain a block-shaped manganese pyrophosphate polyanion lithium battery negative electrode material.

[0048] see Figures 9 to 11 It can be seen that the manganese pyrophosphate polyanion lithium battery negative electrode material prepared in Example 3 has good single-phase and crystallinity, stable structure, and stable electrochemical performance.

[0049] Further, the obtained massive manganese pyrophosphate polyanion lithium battery neg...

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Abstract

A manganese pyrophosphate polyanionic lithium battery negative electrode material is prepared as follows: a soluble divalent manganese salt and a compound containing pyrophosphate ion are uniformly dispersed in an aqueous organic solvent, a manganese divalent salt solution and a solution of a compound containing pyrophosphate ion are respectively formed, and that two solutions are mixed and stirred to carry out a hydrothermal reaction, and the obtained reaction product is filtered, washed and dried to obtain a polyanion negative electrode material manganese pyrophosphate. The negative electrode material of the manganese pyrophosphate polyanionic lithium battery prepared by the invention has the characteristics of single phase, good crystallinity, stable structure, good cycling performanceand the like. As a negative electrode material, it has a very high discharge specific capacity in the process of deep discharge, and can be widely used in lithium storage, new energy materials and other fields. The preparation method has the advantages of simple process, high product purity and low production cost.

Description

technical field [0001] The invention relates to a lithium ion battery negative electrode material and a preparation method thereof, in particular to a manganese pyrophosphate polyanion type lithium battery negative electrode material and a preparation method thereof. Background technique [0002] Manganese pyrophosphate is a very important inorganic salt product, which is widely used in catalysis, adsorption, host-guest assembly, optics, magnetism and other fields due to its special crystal structure. Therefore, the synthesis method of manganese pyrophosphate microcrystals has been attracting people's attention. [0003] At present, the main production methods in industry are as follows: at room temperature, using manganese nitrate and ammonium phosphate as raw materials, one-step synthesis of NH by direct precipitation in aqueous solution 4 PPML 4 ·H 2 O, and then heated to 110-120°C to lose ammonia and water to form manganese pyrophosphate. Alternatively, manganese chl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/42H01M4/58H01M10/0525
CPCC01B25/42H01M4/5825H01M10/0525C01P2006/10C01P2006/34C01P2002/72C01P2004/03C01P2006/40Y02E60/10
Inventor 张佳峰张建永欧星季冠军黄灿灿张宝彭春丽
Owner CENT SOUTH UNIV
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