Manganese and lithium-containing molecular precursors for battery cathode materials

Inactive Publication Date: 2014-01-09
FUJDALA KYLE L +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a range of molecular precursor compounds, compositions, and processes for making cathode materials for lithium ion battery devices. The molecular precursor compounds have specific structures and can be used to make various forms of cathode materials, including thin films. The patent also provides information on the chemical properties of the molecular precursor compounds and the methods for preparing them. The technical effects of this patent include improved methods for making cathode materials for lithium ion battery devices, which can enhance the performance and efficiency of these batteries.

Problems solved by technology

The choice of cathode for a battery is significant in terms of the desired performance and cost.
A drawback in the field of lithium-ion batteries is the difficulty of synthesizing cathode material at moderate temperatures.
Use of moderate temperatures is desirable for production efficiency, but has been a drawback because it limits the choice of cathode material that can be synthesized via conventional processes.
Another problem is to provide cathode material having long term stability under various battery operating conditions.
A further drawback is that the properties desired for the battery, such as energy density, lifecycle, and stability can require cathode materials of high compositional uniformity.
The difficulties with these approaches include controlling the uniformity, purity and homogeneity of the cathode layers, as well as controlling cathode surface and edge quality.
Difficulties in the production of thin film cathodes include limited ability to deposit uniform layers of cathode material with sufficient speed and throughput for commercial processes.

Method used

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  • Manganese and lithium-containing molecular precursors for battery cathode materials
  • Manganese and lithium-containing molecular precursors for battery cathode materials
  • Manganese and lithium-containing molecular precursors for battery cathode materials

Examples

Experimental program
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Effect test

example 1

Cathode Molecular Precursor Compound LiMn(OtBu)3

[0501]A cathode molecular precursor compound represented by the formula LiMn(OtBu)3 was synthesized using the following procedure.

[0502]To a light brown solution of LiN(SiMe3)2 (0.50 g, 3.0 mmol) and Mn[N(SiMe3)2]2 (1.13 g, 3.0 mmol) in 30 mL THF was added tBuOH (0.90 mL, 9.5 mmol) using a syringe under inert atmosphere (Schlenk line). The reaction mixture remained light brown in color. The reaction mixture was stirred at 25° C. for 12 h, followed by filtration and removal of the volatile species (solvent and HN(SiMe3)2) under dynamic vacuum. 0.67 g of product (80%) was isolated as a beige solid.

example 2

Cathode Molecular Precursor Compound LiMn(OsBu)3

[0503]A cathode molecular precursor compound represented by the formula LiMn(OsBu)3 was synthesized using the following procedure.

[0504]To a light brown solution of LiN(SiMe3)2 (0.91 g, 5.4 mmol) and Mn[N(SiMe3)2]2 (2.05 g, 5.4 mmol) in 60 mL THF was added sBuOH (1.60 mL, 17.4 mmol) using a syringe under inert atmosphere (Schlenk line). The reaction mixture slowly changed color to pink / brown in 30 min. The reaction mixture was stirred at 25° C. for 12 h, followed by filtration and removal of the volatile species (solvent and HN(SiMe3)2) under dynamic vacuum. 0.92 g of product (61%) was recovered as a brown solid.

[0505]Elemental analysis by ICP: Li to Mn ratio, 1.00:1.00.

[0506]Elemental analysis by combustion (wt %): C, 50.61, H, 9.60.

example 3

Cathode Molecular Precursor Compound Li2Mn(OsBu)4

[0507]A cathode molecular precursor compound represented by the formula Li2Mn(OsBu)4 was synthesized using the following procedure.

[0508]To an orange solution of LiN(SiMe3)2 (0.84 g, 5.0 mmol) and Mn[N(SiMe3)2]2 (0.95 g, 2.5 mmol) in 100 mL THF was added sBuOH (1.2 mL, 13 mmol) via syringe under inert atmosphere (Schlenk line). The light brown reaction mixture was stirred at 25° C. for 12 h, followed by filtration and removal of volatiles under reduced pressure. 0.53 g of product (59%) was recovered as a brown solid.

[0509]The Li / Mn ratio was found to be 2.14:1.00 by use of ICP analysis.

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Abstract

Lithium-manganese-containing molecular precursor compounds, compositions and processes for making cathodes for lithium ion batteries. The molecular precursor compounds are soluble and provide processes to make cathode materials with controlled stoichiometry in a solution-based processes. The cathode material can be, for example, a lithium manganese oxide, a lithium manganese phosphate, or a lithium manganese silicate. Cathodes can be made as bulk material in a solid form or in solution, or in various forms including thin films.

Description

BACKGROUND[0001]The choice of cathode for a battery is significant in terms of the desired performance and cost. The cathode composition is an important factor for the energy density that can be achieved. For lithium-ion batteries, the choice of cathode can also involve a balance between power available and energy utilization. Thus, the choice of cathode is important for the planned mode of application of the battery.[0002]Useful candidates for cathode materials for lithium-ion batteries include lithium metal oxides, lithium metal phosphates, and lithium metal silicates.[0003]A drawback in the field of lithium-ion batteries is the difficulty of synthesizing cathode material at moderate temperatures. Use of moderate temperatures is desirable for production efficiency, but has been a drawback because it limits the choice of cathode material that can be synthesized via conventional processes. Conventional methods may require temperatures as high as 1000° C.[0004]It is also desirable to...

Claims

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Application Information

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IPC IPC(8): H01M4/58C01B25/45C01D15/02H01M4/505
CPCH01M4/5825H01M4/505C01B25/45C01D15/02C01B33/32C09D11/30C09D11/38Y02E60/10H01M4/02H01M4/525
Inventor FUJDALA, KYLE L.ZHU, ZHONGLIANGMARKOFF JOHNSON, PAUL R.
Owner FUJDALA KYLE L
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