Synthesis of metal compounds useful as cathode active materials

A technology of metal compounds and alkali metal compounds, applied in the direction of alkali metal oxides, vanadium compounds, iron compounds, etc., can solve problems such as damage, difficulty in lithium-containing electrode materials, and low capacity

Inactive Publication Date: 2005-08-10
VALENCE TECH INC
View PDF38 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, currently known and commonly used basic transition metal oxide compounds suffer from low capacity
Therefore, it is still difficult to ...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0185] Using Li 2 CO 3 MoO as Li source in hydrogen 3 Preparation of LiMoO by Carbothermal Reduction 2

[0186] The reaction is set to C→CO reaction (ie >650°C)

[0187] The overall reaction scheme can be written as:

[0188]

[0189] where [C] represents elemental carbon or an equivalent amount of organic precursor material.

[0190] 0.5 g-mol Li 2 CO 3 Equivalent to 36.95g

[0191] 1.0 g-mol MoO 3 Equivalent to 143.94g

[0192] 1.5g-mol of [C] is equivalent to 18.00g elemental carbon

[0193] Excess carbon can be used - typically 0-100% mass excess.

[0194] method:

[0195] (a) Premix the powders in the indicated molar ratios

[0196] (b) Granulating the powder mixture

[0197] (c) Heating the particles to 650-950°C at a rate of 1-5°C / min in a hydrogen atmosphere

[0198] (d) stay at the expected temperature for 2-8 hours

[0199] (e) Cool to room temperature at a rate of 1-5°C / min

[0200] (f) Remove from the furnace when the temperature is <25°C

...

Embodiment 2

[0205] Using LiOH.H 2 O as Li source for MoO 3 direct carbothermal reduction

[0206] The reaction is set to C→CO reaction (ie >650°C)

[0207] The reaction route is:

[0208]

[0209] 1.0 g-mol LiOH.H 2 O is equivalent to 41.96g

[0210] 1.0 g-mol MoO 3 Equivalent to 143.94g

[0211] 1.5 g-mol of [C] is provided by about 21 g polystyrene-polybutadiene

[0212] A surplus of carbon may be used, typically a 0-100% mass excess.

[0213] method:

[0214] (a) Premix the powders in the indicated molar ratios

[0215] (b) Granulating the powder mixture

[0216] (c) Heat the particles to 650-950°C at a rate of 1-5°C / min in an inert gas atmosphere (N 2 , Ar or vacuum)

[0217] (d) stay at the expected temperature for 2-8 hours

[0218] (e) Cool to room temperature at a rate of 1-5°C / min

[0219] (f) Remove from the furnace when the temperature is <25°C

[0220] (g) Transfer to an inert gas atmosphere (such as an Ar glove box). These materials are generally air sens...

Embodiment 3

[0224] Using Li 2 CO 3 As lithium source for MoO 3 Perform direct carbothermal reduction to produce Li x MoO 2 (00.74 MoO 2 , Li 0.85 MoO 2 Wait.

[0225] The reaction is set to C→CO reaction (ie >650°C)

[0226] The overall response is:

[0227]

[0228] x / 2g-mol Li 2 CO 3 Equivalent to (73.89 times x / 2)g

[0229] 1.0 g-mol MoO 3 Equivalent to 143.94g

[0230] 3x / 2g-molC is provided by hydrocarbon precursors such as coal tar about 14g multiplied by 3x / 2

[0231] Excess carbon can be used - typically 0-100% mass excess.

[0232] method:

[0233] (a) Premix the powders in the indicated molar ratios

[0234] (b) Granulating the powder mixture

[0235] (c) Heat the particles to 650-950°C at a rate of 1-5°C / min in an inert gas atmosphere (N 2 , Ar or vacuum)

[0236] (d) stay at the expected temperature for 2-8 hours

[0237] (e) Cool to room temperature at a rate of 1-5°C / min

[0238] (f) Remove from the furnace when the temperature is <25°C

[0239] ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The active material of the present invention includes at least one alkali metal and at least one other metal capable of being oxidized to a higher oxidation state. Preferred other metals are accordingly selected from transition metals (as defined in groups 4-11 of the periodic table), and certain other non-transition metals such as tin, bismuth and lead. The active material can be synthesized through a single-step reaction or a multi-step reaction. In at least one step of the synthesis reaction, reducing carbon is used as a starting material. In one aspect, the reducing carbon is supplied by elemental carbon, preferably in particulate form such as graphite, amorphous carbon, carbon black, and the like. On the other hand, the reducing carbon can also be supplied from an organic precursor material, or a mixture of elemental carbon and an organic precursor material.

Description

technical field [0001] The present invention relates to a method for producing an electrode active material that can be used to prepare electrodes used in electrochemical cells in battery packs. More specifically, the present invention relates to a method comprising reacting a metal compound with a carbon source to obtain an active material, or reducing a transition metal to form an active material. Background technique [0002] Lithium batteries have become useful and desirable sources of energy in recent years. In general, lithium batteries are prepared from one or more lithium electrochemical cells containing electrochemically active (electroactive) materials. Such batteries typically include a negative electrode, a positive electrode, and an electrolyte interposed between the spaced apart positive and negative electrodes. By convention, the negative electrode is the electrode that acts as the anode of the discharge (where the oxidation reaction occurs), while the posit...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B13/14C01B25/30C01B25/45C01D1/02C01G31/00C01G39/00C01G49/00H01M4/02H01M4/04H01M4/485H01M4/505H01M4/525H01M4/58H01M10/40
CPCY02E60/12H01M4/5825H01M4/0471H01M4/505C01G39/02H01M4/525C01G31/00H01M4/485C01B31/02C01G39/00C01B25/445Y02E60/122C01G31/02C01B25/45C01B32/05Y02E60/10C01B25/30C01D1/02C01G49/00
Inventor 杰里米·巴克耶齐德·M·赛义迪杰弗里·斯沃耶董明
Owner VALENCE TECH INC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap