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High capacity cathode active material

A cathode material and electrode technology, applied in the direction of battery electrodes, structural parts, electrical components, etc., can solve the problems of expensive, long-term stability, reduced charge/discharge rate capability, increased battery cost and complexity, etc.

Active Publication Date: 2018-02-16
MASSACHUSETTS INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this overcharging process is more expensive to implement and results in cathode materials with limited long-term stability and reduced charge / discharge rate capabilities
Therefore, overcharging causes oxygen evolution and poses a potential safety risk, and increases the cost and complexity of battery manufacturing

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Li 1+x Mo 2x Cr 1-3x o 2 ,[0.15

[0052] In order to prepare Li 1+x Mo 2x Cr 1-3x o 2 , Li 2 CO 3 、MoO 2 and Cr 3 (OH) 2 (OOCCH 3 ) 7 used as a precursor. more than needed to synthesize Li 1+x Mo 2x Cr 1-3x o 2 , the stoichiometric excess of [02 CO 3 It is used to compensate possible Li loss in high temperature solid-state reaction. The precursor was dispersed into acetone and ball milled for 24 hours and dried overnight to prepare the precursor mixture. The mixture was sintered at 1050 °C under Ar gas for 15 h, and ground manually to obtain the final product.

[0053] Carbon coating can be applied 1) to prevent the dissolution of Mo and Cr, and 2) to reduce the particle size in the carbon coating treatment to increase the Li 1+ x Mo 2x Cr 1-3x o 2 cyclic performance, and 3) to improve the electronic conductivity of the compound. Sucrose (C 12 h 22 o 11 ) can be used as a carbon precursor, and with Li 1+x Mo 2x Cr 1-3x o 2 Mix ...

Embodiment 2

[0060] Li 1+x Ni (2-4x) / 3 m (1+x) / 3 o 2 ,[0.15

[0061] In order to prepare Li 1+x Ni (2-4x) / 3 m (1+x) / 3 o 2 [M=Sb or Nb], Li 2 CO 3 、NiCO 3 and Sb 2 o 5 (or Nb 2 o 5 ) were used as precursors. more than needed to synthesize Li 1+x Ni (2-4x) / 3 m (1+x) / 3 o 2 , the stoichiometric excess of [02 CO 3It is used to compensate possible Li loss in high temperature solid-state reaction. The precursor was dispersed into acetone and ball milled for 24 hours and dried overnight to prepare the precursor mixture. The mixture was heated at 800 °C in O 2 Sintering in air for 15 hours and grinding by hand to obtain the final product.

[0062] Carbon coating can be applied 1) to reduce particle size in carbon coating treatment to increase Li 1+x Ni (2-4x) / 3 m (1+x) / 3 o 2 [M=Sb or Nb] for cycling performance, and 2) to improve the electronic conductivity of the compound. Sucrose (C 12 h 22 o 11 ) can be used as a carbon precursor, and with Li 1+x...

Embodiment 3

[0065] Li 1+x Ni (3-5x) / 4 Mo (1+x) / 4 o 2 ,[0.15

[0066] In order to prepare Li 1+x Ni (3-5x) / 4 Mo (1+x) / 4 o 2 , Li 2 CO 3 、NiCO 3 and MoO 2 Can be used as a precursor. more than needed to synthesize Li 1+x Ni (3-5x) / 4 Mo (1+x) / 4 o 2 The stoichiometric excess of [02 CO 3 It is used to compensate possible Li loss in high temperature solid-state reaction. The precursor was dispersed into acetone and ball milled for 24 hours and dried overnight to prepare the precursor mixture. The mixture was heated at 800 °C in O 2 Sintering in air for 10 hours and grinding by hand to obtain the final product.

[0067] Carbon coating can be applied 1) to reduce particle size in carbon coating treatment to increase Li 1+x Ni (3-5x) / 4 Mo (1+x) / 4 o 2 cyclic performance, and 2) to improve the electronic conductivity of the compound. Sucrose (C 12 h 22 o 11 ) can be used as a carbon precursor, and with Li 1+x Ni (3-5x) / 4 Mo (1+x) / 4 o 2 Mix in a planetary ball mi...

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Abstract

The present disclosure provides a positively active lithium-excess metal oxide having a composition LixMyO2 (0.6≤y≤0.85 and 0≤x+y≤2) for a lithium secondary battery, which has a highly reversible capacity. The material exhibits high capacity without overcharging during the first cycle.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Patent Application 61 / 708,963, filed October 2, 2012, the entire contents of which are hereby incorporated by reference. technical field [0003] The present disclosure relates to a discharging positive electrode (also known as a cathode) of a lithium secondary battery that exhibits a large reversible capacity and does not require overcharging (charging beyond the theoretical capacity limit) in the first cycle , and synthetic routes for their manufacture. Background technique [0004] Lithium battery cathode material: Cathode (cathode) material is the limiting factor in the production of high capacity and high energy density lithium ion batteries. An important class of cathode materials for secondary lithium batteries is composed of the general LiMO 2 The rock-salt type layered lithium metal oxide is composed of, where M is a metal or a mixture of several kinds. In ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/485
CPCH01M4/131H01M4/366H01M4/485H01M4/525H01M4/624H01M4/625Y02E60/10H01M10/0525
Inventor 格布兰德·塞德李振赫亚历山大·厄本李新金尚泰若弗鲁瓦·豪特尔
Owner MASSACHUSETTS INST OF TECH
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