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Method for synthesizing high tap density spinel material LiNi0.5Mn1.5O4

A technology of tap density and spinel, which is applied in the direction of manganate/permanganate, etc., can solve the problems that lithium nickel manganese oxide is not easy to increase the tap density of products, limit the application of electrode materials, and cause safety hazards of combustion and explosion. To achieve the effects of easy control of the process, no safety accidents, and good processability

Inactive Publication Date: 2013-09-11
成都兴能新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Yu Zuolong et al. used ethanol as the dispersion medium to prepare lithium nickel manganese oxide material (CN 101844817 A). The "sol-gel-self-propagating The "combustion method" may cause safety hazards of combustion and explosion because it has to go through a combustion process containing a large amount of ethanol sol, which limits its application in large-scale industrial production.
In addition, the liquid-phase method for preparing lithium nickel manganese oxide reported in many literatures, including the above-mentioned patents, is often not easy to increase the tap density of the product, which also limits the application of the prepared electrode material in the actual battery production process.

Method used

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  • Method for synthesizing high tap density spinel material LiNi0.5Mn1.5O4
  • Method for synthesizing high tap density spinel material LiNi0.5Mn1.5O4
  • Method for synthesizing high tap density spinel material LiNi0.5Mn1.5O4

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Experimental program
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Effect test

Embodiment 1

[0028] Taking lithium carbonate, nickel nitrate, manganese, citric acid, and ice acetic acid as the raw material, and water as a dispersant, the ratio of li: NI: Mn is 1: 0.5: 1.5 mix (Moore ratio, the same below).First add a sufficient amount of methamphetamine to the lithium carbonate to form lithium acetate, then add it to the nickel nitrate solution, then add manganese and citric acid to the above solution, stir and heat upDry forming powder, burn the powder for 3 hours under 350 ° C and burn at 750 ° C for 12 hours to get the final product. The vibration density is 2.3g / cm 3 EssenceThe product is assembled into a battery test, and the test ratio is 145mAh / g at 0.2C between 3.5V and 5.2V, the capacity of the test ratio of 10C is 121mAh / g under 10C conditions, and the capacity of 800 under 2C loop remains maintained.The rate is more than 88%.

Embodiment 2

[0030] Taking lithium carbonate, nickel nitrate, manganese, citric acid, and ice acetic acid as the raw material, and water as a dispersant, the ratio of LI: NI: Mn is 1.05: 0.5: 1.5 (Moore ratio, the same below).First add a sufficient amount of methamphetamine to the lithium carbonate to form lithium acetate, then add it to the nickel nitrate solution, then add manganese and citric acid to the above solution, stir and heat upDrying forms powder, burn the powder at 450 ° C for 1 hour and burn at 800 ° C for 12 hours to get the final product. 3 EssenceThe product is assembled into a battery test, and the test ratio is 143mAh / G under 0.2C between 3.5V and 5.2V, the capacity of the test ratio is more than 117mAh / g under 10C conditions, and the capacity of 100 times after 2C is maintained.The rate is more than 90%.

Embodiment 3

[0032] Taking lithium carbonate, nickel nitrate, manganese, citric acid, and ice acetic acid as the raw material, and water as a dispersion, the ratio of LI: NI: Mn is 1.: 0.52: 1.5 mix (Moore ratio, the same below).First add a sufficient amount of methamphetamine to the lithium carbonate to form lithium acetate, then add it to the nickel nitrate solution, then add manganese and citric acid to the above solution, stir and heat upDrying forms powder, burned the powder for 1 hour at 550 ° C and burned for 3 hours at 800 ° C to get the final product. The vibration density is 2.38g / cm 3 EssenceThe product is assembled into a battery test, and the test ratio is 146mAh / g at 0.2C between 3.5V and 5.2V, the capacity of the test ratio of 119mAh / G under 10C conditions is over 119mAh / g, and the capacity of 500 under 2C is maintained.The rate is more than 95%.

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Abstract

The invention discloses a method for synthesizing a high tap density spinel material LiNi0.5Mn1.5O4. The method is characterized by comprising the steps of: (1) dissolving a lithium salt, a nickel salt, a manganese salt and an additive in certain proportion in deionized water, stirring and heating the water so as to form a sol mixture; (2) presintering the sol at a specific temperature for a specific period of time, thus obtaining a primary product; (3) subjecting the primary product to high temperature formal sintering for a specific period of time under a specific temperature, thus obtaining an end product. The process of the invention has the characteristics of simple gel forming method, short production period, lower energy consumption, less hidden dangers in large scale production, and low production cost, etc. And the spinel-type nickel lithium manganate positive material prepared by the method of the invention has the advantages of high product purity, high tap density, uniform product particle and stable electrochemical performance.

Description

Technical field [0001] The invention is the field of inorganic functional materials synthesis, which is suitable for preparation of high -vibration -density lithium -ion battery 5V orthopedic materials. Background technique [0002] Generally, the lithium -ion battery positive material above 4.5V is called a high potential positive material, or the 5V -level positive pole material. According to the current research results, such high potential positive materials mainly include spinel -shaped lims. x Mn 2-x O 4 (Here 0 ≤ x≤1, M is iron, copper, cobalt, nickel, chromium, and its peers of transition metal elements), olive -shaped Limpo 4 (M is the transitional metal elements of cobalt, nickel, chromium, and its peers), and some other layer -like materials.Among them, spinel -gravitational nickel manganate materials with a 4.7V voltage platform (chemical formula is: lini 0.5 Mn 1.5 O 4 ), Whether it is the theoretical calculation or the research on the preparation of the laboratory, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/12
Inventor 王维利范未峰
Owner 成都兴能新材料股份有限公司
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