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Preparation method of lithium manganese phosphate and lithium manganese phosphate/carbon composite material

A technology of lithium manganese phosphate and phosphoric acid is applied in the field of preparation of positive electrode materials for lithium ion batteries to achieve the effects of perfect crystal form, good electrochemical performance and short stroke.

Active Publication Date: 2017-06-13
JIANGSU HUADONG INST OF LI ION BATTERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Mn will be present whenever there is water in the reaction medium 2+ Oxidation problem

Method used

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  • Preparation method of lithium manganese phosphate and lithium manganese phosphate/carbon composite material
  • Preparation method of lithium manganese phosphate and lithium manganese phosphate/carbon composite material
  • Preparation method of lithium manganese phosphate and lithium manganese phosphate/carbon composite material

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[0013] The embodiment of the present invention provides a preparation method of lithium manganese phosphate, comprising the following steps:

[0014] S1, divalent manganese (Mn 2+ ) source, lithium (Li + ) source and phosphate (PO 4 3+ ) sources are mixed and dissolved in a solvothermal reaction medium to form a mixed solution, and the solvothermal reaction medium includes an organic solvent and a co-solvent;

[0015] S2, performing a solvothermal reaction on the mixed solution to obtain a reaction product lithium manganese phosphate.

[0016] The divalent manganese source may be one or more of manganese chloride, manganese nitrate, manganese sulfate and manganese acetate.

[0017] The lithium source can be one or more of lithium hydroxide, lithium acetate, lithium carbonate and lithium oxalate.

[0018] The phosphate source can be one or more of phosphoric acid, lithium dihydrogen phosphate, ammonium phosphate, diammonium hydrogen phosphate and ammonium dihydrogen phosph...

Embodiment 1

[0051] Measure 70mL of ethylene glycol and 30mL of alkylphenol polyoxyethylene ether and mix evenly, then add 7.916g of manganous chloride tetrahydrate, and stir mechanically for 60 minutes to form a uniform manganous chloride solution. Measure 3mL of phosphoric acid, drop by drop into the manganous chloride solution, and mechanically stir for 2 hours to form a uniform mixed solution A. Then weigh 5.035g of lithium hydroxide monohydrate, add it into 100mL of ethylene glycol, and mechanically stir for 60 minutes to form a uniform lithium hydroxide solution. The solution A was added dropwise into the lithium hydroxide solution, stirred and reacted for 60 minutes, sealed into a high-temperature reactor with a polytetrafluoroethylene liner, kept at a constant temperature of 180°C, and reacted for 5 hours. The obtained product is the lithium manganese phosphate material after being centrifuged, washed and dried. The lithium manganese phosphate material was mixed with 15wt% sucrose...

Embodiment 2

[0054] Measure 70mL of ethylene glycol and 30mL of alkylphenol polyoxyethylene ether and mix evenly, then add 5.533g of manganous chloride tetrahydrate and 3.3362 g of ferrous sulfate heptahydrate, and stir mechanically for 60 minutes to form a uniform mixture of manganous chloride and sulfurous acid iron mixed solution. Measure 3mL of phosphoric acid, drop by drop into the mixed solution of manganous chloride and ferrous sulfate, mechanically stir for 2 hours to form a uniform mixed solution A. Then weigh 5.035g of lithium hydroxide monohydrate, add it into 100mL of ethylene glycol, and mechanically stir for 60 minutes to form a uniform lithium hydroxide solution. The solution A was added dropwise into the lithium hydroxide solution, stirred and reacted for 60 minutes, sealed into a high-temperature reactor with a polytetrafluoroethylene liner, kept at a constant temperature of 180°C, and reacted for 5 hours. The obtained product is centrifuged, washed and dried to be lithiu...

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Abstract

The invention relates to a preparation method of lithium manganese phosphate, which includes the following steps: mixing and dissolving a divalent manganese source, a lithium source and a phosphate source in a solvothermal reaction medium to form a mixed solution. The solvothermal reaction medium includes an organic solvent. and a co-solvent; and subjecting the mixed solution to a solvothermal reaction to obtain the reaction product lithium manganese phosphate. The invention also relates to a preparation method of lithium manganese phosphate / carbon composite material.

Description

technical field [0001] The invention relates to a preparation method of a positive electrode material of a lithium ion battery, in particular to a preparation method of lithium manganese phosphate and a preparation method of lithium manganese phosphate / carbon composite material. Background technique [0002] Olivine LiMPO 4 (M=Fe, Mn) material has become one of the research hotspots of lithium-ion battery cathode materials due to its non-toxicity, high voltage platform, high specific capacity, good cycle performance and safety performance, but Fe 3+ / Fe 2+ relative to Li + The electrode potential of Li / Li is only 3.4 V, which limits the LiFePO 4 development of. while Mn 3+ / Mn 2+ relative to Li + The electrode potential of / Li is 4.1 V, which is exactly located in the existing commercial electrolyte (LiPF 6 / EC+DMC) stable electrochemical window, so LiMnPO 4 Has a ratio of LiFePO 4 Higher energy density has gradually attracted people's attention. However, since Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/58C01B25/45
CPCC01P2002/50C01P2002/72C01B25/45C01P2006/40H01M4/5825H01M4/625Y02E60/10H01M4/0471H01M4/136H01M4/1397H01M10/0525
Inventor 王莉何向明刘少军张建利罗晶尚玉明李建军高剑任玉梅张宏生
Owner JIANGSU HUADONG INST OF LI ION BATTERY
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