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High voltage lithium ion positive electrode material

A technology of positive electrodes and ions, which is applied in the direction of positive electrodes, battery electrodes, active material electrodes, etc., and can solve problems such as capacity fading barriers

Active Publication Date: 2016-01-06
美国政府(由美国陆军部长代表)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, and even for LiCoPO 4 initial studies have led to improvements in discharge rates, capacity fade has still hindered further development [6 to 10]

Method used

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  • High voltage lithium ion positive electrode material
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Embodiment Construction

[0022] An improved Li ion positive electrode material having an initial capacity of at least 120 mAh / g and a discharge capacity of at least 100 mAh / g after 500 cycles is provided. In some cases, the improved Li-ion positive electrode material has an initial capacity of at least 125 mAh / g and a discharge capacity of at least 105 mAh / g after 500 cycles. Additionally, the material may contain Si, which provides a Coulombic efficiency of between 97 and 100% at a C / 3 cycle rate.

[0023] It should be understood that compared to LiCoPO 4 , improved capacity and significantly reduced capacity fade are prominent. For LiCoPO 4In the most favorable cases of Ti and Fe or Cr and Fe modification, the use of two-component modification increases the discharge capacity from ~100mAh / g to about 130mAh / g while retaining the mono-Fe-substituted LiCoPO 4 discharge capacity retention. Modification with additional components to include Si increases cycle life and greatly improves Coulombic effic...

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Abstract

A positive electrode material having a nominal stoichiometry Li 1+y / 2 Co 1-x-y-z-d Si z Fe x M y M' d (PO 4 ) 1+y / 2 where M is a trivalent cation selected from at least one of Cr, Ti, Al, Mn, Ni, V, Sc, La and / or Ga, M' is a divalent cation selected from at least one of Mn, Ni, Zn, Sr, Cu, Ca and / or Mg, y is within a range of 0 < y 0.10 and x is within a range of 0 x 0.2. The use of double compositional modification to LiCoPO 4 increases the discharge capacity from 1 / 4 100 mAh / g to about 130 mAh / g while retaining the discharge capacity retention of the singly Fe-substituted LiCoPO 4 . Additional compositional modification to include Si increases the cycle life and greatly improved the coulombic efficiency to between 97-100% at a C / 3 cycle rate.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of US Provisional Patent Application No. 61 / 911,700, filed December 04, 2013, the entire disclosure of which is incorporated herein by reference in its entirety. [0003] government interest [0004] The invention described herein may be made, used, and licensed by or for the United States Government. technical field [0005] The present invention relates generally to a positive electrode material, and more particularly to a high voltage lithium ion positive electrode material. Background technique [0006] LiFePO 4 [1] is a Li ion positive electrode material, which is favored by people because of its strong abuse resistance, which is attributed to the nature of the oxygen bonding in the phosphate group [2]. Also, there is a need to exploit the abuse resistance of phosphate-based cathodes in materials that store more energy. Since the stored energy is proportional to voltage, ...

Claims

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Application Information

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IPC IPC(8): C01B25/45H01M4/58H01M10/0525
CPCC01B25/45H01M4/5825H01M10/052Y02E60/10H01M2004/028
Inventor 简·L·艾伦乔舒亚·L·艾伦赛缪尔·A·德尔普三世杰弗里·B·沃尔芬斯泰恩T·理查德·约瓦
Owner 美国政府(由美国陆军部长代表)
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