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Electrodes comprising mixed active particles

A technology of electrodes and mixtures, applied in battery electrodes, non-aqueous electrolyte battery electrodes, circuits, etc., can solve problems such as insufficient voltage, insufficient charging capacity, and uneconomical

Inactive Publication Date: 2010-03-03
VALENCE TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many cathode materials known in the art lack one or more of these characteristics
So, for example, many of these materials are not economical to manufacture, do not provide sufficient voltage, have insufficient charge capacity, or lose the ability to recharge after many cycles

Method used

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  • Electrodes comprising mixed active particles
  • Electrodes comprising mixed active particles
  • Electrodes comprising mixed active particles

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0187] After the preparation of the first step, the second step of the reaction is continued to react the lithium metal phosphate (provided in the first step) with a lithium salt, preferably lithium fluoride (LiF). LiF is mixed with lithium metal phosphate in proportion to provide a lithiated transition metal fluorophosphate product. Lithiated transition metal fluorophosphates have the ability to donate lithium ions to the electrochemical potential.

[0188] In addition to the previously described two-step method, a one-step reaction method can also be used to prepare this preferred material of the present invention. In one method of the invention, the starting materials are mixed thoroughly and then reacted together when heating is initiated. Typically, the mixed powders are compressed into pellets. The pellets are then heated to high temperature. This reaction can be performed under an air atmosphere or a non-oxidizing atmosphere. In another approach, lithium metal phosp...

Embodiment 1

[0240] Contains LiFe 0.9 Mg 0.1 PO 4 and LiCoO 2 The blends of the invention are prepared as follows. Each active material is prepared separately and then mixed to form a blend of active material particles for use in the electrode.

(a) The first active material LiFe 0.9 Mg 0.1 PO 4 was prepared as follows. The following sources comprising Li, Fe, Mg and phosphate were provided, containing the respective elements in a molar ratio of 1.0:0.9:0.1:1.0.

0.50 mole Li 2 CO 3 (mol.wt.73.88g / mol), 1.0 mole Li 36.95g

0.45 mol Fe 2 o 3 (159.7g / mol), 0.9 mole Fe 71.86g

0.10 mole Mg(OH) 2 (58g / mol), 0.1 mole Mg 5.83g

1.00 moles (NH 4 ) 2 HPO 4 (132g / mol), 1.0 mole phosphate 132.06g

0.45 moles of elemental carbon (12g / mol) (=100% mass excess) 5.40g

[0241] The above starting materials were mixed and ball milled to mix the particles. Afterwards, the particle mixture is pelletized. The pelletized mixture was heated in a furnace at 750° C. for 4-20 hours in an argon...

Embodiment 2

[0246] Contains LiCo 0.8 Fe 0.1 Al 0.025 Mg 0.05 PO 3.975 f 0.025 and LiFe 0.95 Mg 0.05 PO 4 The blends of the invention are prepared as follows. Each active material is prepared separately and then mixed to form a blend of active material particles for use in the electrode.

(a) The first active material LiCo 0.8 Fe 0.1 Al 0.025 Mg 0.05 PO 3.975 f 0.025 was prepared as follows. The following sources were provided comprising Li, Co, Fe, Al, Mg, phosphate and fluoride, containing the respective elements in a molar ratio of 1.0:0.8:0.1:0.025:0.05:1.0:0.025.

0.05 mole Li 2 CO 3 (mol.wt.73.88g / mol), 0.1 mole Li 3.7g

0.02667 mol Co 3 o 4 (240.8g / mol), 0.08 mole Co 6.42g

0.005 mol Fe 2 o 3 (159.7g / mol), 0.01 mole Fe 0.8g

0.0025 mol Al(OH) 3 (78g / mol), 0.0025 mole Al 0.195g

0.005 mole Mg(OH) 2 (58g / mol), 0.005 mole Mg 0.29g

0.1 mole (NH 4 ) 2 HPO 4 (132g / mol), 0.1 mole phosphate 13.2g

0.00125 mol NH 4 HF 2 (57g / mol), 0.0025 mole F 0.071g

0.2...

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PUM

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Abstract

A battery containing a first electrode and a second electrode, and an electrolyte for transferring ionic charge-carriers there between, wherein the first electrode contains a first electrode active material represented by the formula A<2>eM<4>kM<5>mM<6>nM<7>oOg, and at least one second electrode active material selected from the group consisting of active materials represented by the formula A<1>aM<1>b(XY4)cZd, active materials represented by the formula A<3>hMniO4, and mixtures thereof.

Description

field of invention [0001] The present invention relates to electrode active materials, electrodes and batteries. In particular, the present invention relates to mixtures or blends of various active materials including alkali metals, transition metals, oxide moieties, phosphates or the like, halogens or hydroxides, and combinations thereof. Background of the invention [0002] A variety of electrochemical cells, or "batteries," are known in the art. In general, batteries are devices that convert chemical energy into electrical energy through electrochemical redox reactions. Batteries are used in a variety of applications, especially as a power source for devices that cannot be powered from a central source of power generation (eg, by commercial power plants using public transmission lines). [0003] A battery can generally be described as comprising three parts: the anode, which contains material that is oxidized (donates electrons) during battery discharge (i.e., when the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/02H01B1/06H01M4/1315H01M4/134H01M4/50H01M4/505H01M4/52H01M4/525H01M10/0525H01M10/36
CPCH01M4/505H01M4/525H01M4/5825H01M10/0525H01M4/364H01M4/134Y02E60/122H01M4/1315Y02E60/10H01M4/13H01M4/36H01M10/052
Inventor 杰里米·巴克
Owner VALENCE TECH INC
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