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Lithium-rich manganese-based hollow nanosphere cathode material formed by winding slices and preparation method thereof

A hollow nanometer, lithium-rich manganese-based technology, applied in the fields of material synthesis and electrochemistry, achieves the effects of simple and easy operation, reduced diffusion paths, improved cycle stability and rate performance

Inactive Publication Date: 2017-11-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium-rich materials designed above only simply improve the performance of a certain aspect.

Method used

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  • Lithium-rich manganese-based hollow nanosphere cathode material formed by winding slices and preparation method thereof
  • Lithium-rich manganese-based hollow nanosphere cathode material formed by winding slices and preparation method thereof
  • Lithium-rich manganese-based hollow nanosphere cathode material formed by winding slices and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0074] The preparation steps of the high-capacity lithium-rich manganese-based hollow nanosphere positive electrode material wound by the sheet in this embodiment are as follows:

[0075] 1. Accurately weigh 0.305g of polyvinylpyrrolidone (PVP, Sigma, Mw=55000) with an electronic balance and dissolve it in 60mL of deionized water with vigorous stirring to form a transparent solution. 2 Remove the dissolved oxygen in the solution for 30min, and accurately measure 20mL styrene solution (Reagent ≥99%, Sigma-Aldrich) was added to the above PVP solution, the temperature was raised to 70°C and kept for 30min. 0.4 g of azobisisobutylamidine hydrochloride (V-50) initiator dissolved in 2.5 mL of deionized water was added to the above mixed solution of PVP and styrene, and kept at 70° C. for 24 h in a nitrogen atmosphere. Centrifuge, wash, and dry at 70°C to obtain polystyrene balls with a particle size of about 550 nm; figure 1 This is the SEM photo of the polystyrene balls prepare...

Embodiment 2

[0085] The preparation steps of the high-capacity lithium-rich manganese-based hollow nanosphere positive electrode material wound into thin sheets in this example are the same as those in Example 1, except that:

[0086] In step 1, 0.5 g of polyvinylpyrrolidone (PVP) was accurately weighed with an electronic balance, 30 mL of styrene solution was added to the above PVP solution, and the temperature was raised to 70° C. and kept for 30 min. 0.5 g of azobisisobutylamidine hydrochloride (V-50) initiator dissolved in 2.5 mL of deionized water was added to the above mixed solution of PVP and styrene, and kept at 70° C. for 24 h in a nitrogen atmosphere. Centrifuge, wash, and dry at 70°C to obtain polystyrene balls with a particle size of about 1.0 μm.

[0087] Using the same sulfonation method as in Example 1, the particle size of the polystyrene spheres after sulfonation was 900 nm.

[0088] In the high-capacity lithium-rich manganese-based hollow nanosphere anode material wound...

Embodiment 3

[0090] In this example, a high-capacity lithium-rich manganese-based hollow nanosphere anode material wound by flakes is prepared, and the specific steps are as follows:

[0091] 1. Accurately weigh 0.1 g of polyvinylpyrrolidone (PVP, Sigma, Mw=55000) with an electronic balance and dissolve it in 60 mL of deionized water with vigorous stirring to form a transparent solution. 2 Remove the dissolved oxygen in the solution for 30min, and accurately measure 10mL styrene solution (Reagent ≥99%, Sigma-Aldrich) was added to the above PVP solution, the temperature was raised to 70°C and kept for 30min. 0.4 g of azobisisobutylamidine hydrochloride (V-50) initiator dissolved in 2.5 mL of deionized water was added to the above mixed solution of PVP and styrene, and kept at 70° C. for 24 h in a nitrogen atmosphere. Centrifuge, wash, and dry at 70°C to obtain polystyrene balls with a particle size of about 300 nm;

[0092] 2. Accurately measure 20mL of concentrated sulfuric acid (AR, 9...

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Abstract

The invention provides a lithium-rich manganese-based hollow nanosphere cathode material formed by winding slices and a preparation method thereof. A molecular formula of the cathode material is xLi<2>MnO<3>.(1-x)LiNi<1 / 3>Co<1 / 3>Mn<1 / 3>O<2>, wherein the x is greater than 0 and is smaller than 1. The preparation method comprises the steps of preparing polystyrene spheres a; sulfonating the polystyrene spheres a, thereby obtaining sulfonated polystyrene spheres a; dissolving nickel salt, cobalt salt, manganese salt and hexamethylenetetraminein into sodium citrate solution, thereby obtaining solution c; dispersing the sulfonated polystyrene spheres a in the solution c, and carrying out absorption, centrifugation, washing and drying to obtain powder d; grinding and mixing the powder d and lithium salt to obtain powder e; and carrying out high temperature calcination on the powder e, thereby obtaining the cathode material. According to the cathode material prepared by the invention, the first-time discharge capacity under 0.1C reaches 281.7mAh g<-1>, the first-time discharge capacity under 10C reaches136.6mAh g<-1>, and after circulation of 200 circles, a capacity retention ratio under 10C is 70%.

Description

technical field [0001] The invention belongs to the technical field of material synthesis and electrochemistry, and relates to a lithium-ion battery positive electrode material and a preparation method thereof, in particular to a lithium-rich manganese-based hollow nanosphere positive electrode material wound by thin sheets and a preparation method thereof. Background technique [0002] Lithium-ion batteries have the outstanding advantages of high working voltage, large specific energy, long charge and discharge life, low self-discharge rate, and no pollution. At present, lithium-ion batteries have been widely used in many consumer electronic devices represented by smart phones, tablet computers and mobile power supplies, and it is estimated that by 2020, the global market value of lithium-ion battery-related products will reach 38 billion US dollars . In addition, with the development of new energy vehicles and large-scale energy storage equipment, lithium-ion batteries wi...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/364H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 章俊良张尧张万森沈水云夏国锋吴爱明殷洁炜
Owner SHANGHAI JIAO TONG UNIV
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