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Alkali metal oxyanion electrode material having a carbon deposited by pyrolysis and process for making same

a technology electrode material, which is applied in the field of alkali metal oxyanion electrode material having a carbon deposited by pyrolysis and the process for making same, can solve the problems of battery capacity decline, loss of electronic conductive network contact with the cathode material, and/or cathode material particle breakage, etc., to reduce unit lattice volume expansion/shrinkage variation, less technical challenges, and increase capacity

Inactive Publication Date: 2016-02-04
JOHNSON MATTHEY PLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The described cathode material exhibits reduced unit cell volume changes and improved performance, characterized by lower BET surface area and increased capacity, with a simplified industrial-scale production process compared to previous methods.

Problems solved by technology

During battery cycling, it has been observed that such positive electrodes generally show a deleterious increase in electrode resistance.
It is believed that these variations induce a loss of electronically conductive network contact with the cathode material and / or breaking of cathode material particles.
As a result, the battery's capacity decreases and the battery has a resulting shorter life span.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Synthesis of Fe2P2O7 by Hydrogen Reduction of FePO4

[0140]30 kg of FePO4.2H2O (sold by Budenheim, grade E53-81) were fed into a rotary kiln and heated up to 700° C. and maintained at that temperature for 2 hours to produce Fe2P2O7. The kiln was continuously flushed with a hydrogen / nitrogen mixture lo throughout the duration of the thermal step (5% hydrogen in nitrogen gas mix).

example 2

Synthesis of C-Fe2P2O7

[0141]A mixture comprising 30 kg of FePO4.2H2O (sold by Budenheim, grade E53-81) and 1.5 kg of polyethylene-block-poly(ethylene glycol) comprising 50% of ethylene oxide (sold by Sigma-Aldrich) was mixed in a plow mixer for 30 min (sold by Littleford Day, Inc., USA). The mixture was introduced in a rotary kiln and heated up to 500° C. and maintained at that temperature for 2 hours to produce carbon-deposited Fe2P2O7 (C—Fe2P2O7). The kiln was continuously flushed with nitrogen throughout the duration of the thermal step.

example 3

Synthesis of Fe2P2O7 from FeC2O4 and NH4H2PO4

[0142]Fe2P2O7 was prepared by a solid-state reaction using iron oxalate and ammonium dihydrogen phosphate as described by Hu and al. (Journal of Central South University of Technology, (2008), 15, pages 531-534). Iron oxalate (1 mole) and NH4H2PO4 (1 mole) were mixed and milled in a planetary mill at a speed of 300 r / min for 4 hours in acetone resulting in a slurry. The slurry was then dried at 80° C. and the resulting dried mixture was heated at 650° C. under argon, fora time sufficient to produce Fe2P2O7 with a particle size distribution ranging from 0.45 to 3.3 μm.

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Abstract

An alkali metal oxyanion cathode material comprising particles, where the particles carry, on at least a portion of the particle surface, carbon deposit by pyrolysis is described. The particles have the general formula A: M:M′:X04 where the average valency of M is −2 or greater; A is at least one alkali metal selected from Li, Na and K; M is at least Fe and / or Mn; and M′ is a metal of valency of 2+ or more.

Description

CROSS REFERENCE TO RELATED APPLICATIONS[0001]The present application hereby claims the benefit of the provisional patent application Ser. No. 61 / 787,490, filed on Mar. 15, 2013, the disclosure of which is hereby incorporated by reference in its entirety,BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to the field of electrode materials, and more specifically, to an alkali metal oxyanion electrode material having a carbon deposited by pyrolysis, as well as to a process for making same.[0004]2. Description of Related Art[0005]Positive electrodes of lithium-ion battery generally comprise an electrochemically active cathode material, a binder and carbon particles which act as an electronically conductive additive. During battery cycling, it has been observed that such positive electrodes generally show a deleterious increase in electrode resistance. It has been proposed that as the number of cycles increases, the cathode material exhibits un...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01M4/04H01M4/133H01M4/136H01M4/36H01M4/58H01M4/587
CPCH01M4/0471H01M4/133H01M4/136H01M4/0428H01M4/5825H01M4/587H01M4/366H01M4/1397H01M4/625H01M10/0525Y02E60/10
Inventor LIANG, GUOXIANROUSSELOT, STEEVEDUFOUR, JASMIN
Owner JOHNSON MATTHEY PLC
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