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Process for producing electrode active material for lithium ion cell

A technology of electrode and slurry, applied in the field of synthesis of electroactive lithium vanadium phosphate materials

Inactive Publication Date: 2010-11-17
VALENCE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Methods for preparing such compounds at laboratory scale have not always been efficient and reproducible at the manufacturing level

Method used

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  • Process for producing electrode active material for lithium ion cell
  • Process for producing electrode active material for lithium ion cell
  • Process for producing electrode active material for lithium ion cell

Examples

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Embodiment 1

[0051] Preparation of LVP

[0052] About 1 metric ton of lithium vanadium phosphate was prepared according to the following method. Multiple batches of LHP, V 2 o 3 Mix with carbon in water and spray dry. A single batch consisting of LHP (32.29 kg, Suzhou) was dissolved in deionized water (120 kg). Add V to the LVP solution in the Attritor mixer 2 o 3 (15.44kg, Stratcor) and Super P (2.269kg, Timcal) to form a slurry. This slurry was spray dried (inlet 350°C / outlet 142°C) to form a homogeneous precursor composition. The precursor composition was ball milled for 4 hours to form a milled precursor composition. The resulting milled precursor composition was pelletized under 2000 psi rolling pressure to form particles 3 / 16 inch in diameter. Subsequently, the pelletized precursor was pre-fired in a pan oven at 260° C. for about 4 hours to form a precursor composition with a moisture content of less than 1%. The resulting granulated low water content precursor composition w...

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Abstract

The present invention relates to a method for preparing a lithium vanadium phosphate material comprising mixing water, lithium dihydrogen phosphate, V2O3 and a source of carbon to produce a first slurry; wet blending the first slurry; spray drying the wet blended slurry to form a precursor composition; milling the precursor composition to obtain a milled precursor composition; compacting the milled precursor to obtain a compacted precursor; pre-baking the compacted precursor composition to obtain a precursor composition with low moisture content; and calcining the precursor composition with low moisture content at a time and temperature sufficient to produce a lithium vanadium phosphate. The lithium vanadium phosphate so produced can optionally be further milled to obtain the desired particle size. The electrochemically active lithium vanadium phosphate so produced is useful in making electrodes and batteries and more specifically is useful in producing cathode materials for electrochemical cells.

Description

field of invention [0001] The present invention relates to the synthesis of electroactive lithium vanadium phosphate materials used in electrodes, in particular to the synthesis of cathode active materials used in lithium ion batteries. Background technique [0002] The proliferation of portable electronic devices such as cell phones and laptop computers has led to an increased demand for high capacity, durable and lightweight batteries. Because of this demand, alkali metal batteries, especially lithium-ion batteries, have become practical and desirable energy sources. Lithium metal, sodium metal, and magnesium metal batteries are well known ideal energy sources. [0003] For example, typical lithium batteries are made from one or more lithium electrochemical cells containing electrochemically active (electroactive) materials. These batteries typically include at least a negative electrode, a positive electrode, and an electrolyte for facilitating the movement of ionic cha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/04H01M4/58H01M10/36
CPCH01M4/5825Y02E60/122C01B25/45H01M4/136Y02E60/10C01B25/372H01M4/0433H01M4/0471H01M4/5805
Inventor M·耶齐德·赛义迪拉尔夫·莫斯哈格埃里克·迈耶张秋华斯科特·霍格丹·哈特苏奥
Owner VALENCE TECH INC
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