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Ion conductor and heterostructure co-modified lithium ion battery positive electrode material and preparation method and application thereof

A lithium-ion battery, ion conductor technology, applied in battery electrodes, active material electrodes, positive electrodes, etc., can solve problems such as the lack of effective elimination of residual lithium on the surface of the material, the degradation of the internal structure of the material, and the limited effect of suppressing side reactions on the electrode surface.

Active Publication Date: 2020-10-20
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method does not effectively eliminate the residual lithium on the surface of the material, and has a limited inhibitory effect on the side reactions on the electrode surface; in addition, this coating can alleviate the side reactions caused by electrolyte erosion, but it cannot inhibit the phase transition of the material, that is, it cannot solve the problem. The problem of degradation of the internal structure of the material, so the application has certain limitations

Method used

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  • Ion conductor and heterostructure co-modified lithium ion battery positive electrode material and preparation method and application thereof
  • Ion conductor and heterostructure co-modified lithium ion battery positive electrode material and preparation method and application thereof
  • Ion conductor and heterostructure co-modified lithium ion battery positive electrode material and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0048] Mix the lithium-rich material precursor with lithium carbonate, where TM:Li=1:1.5, mix evenly, sinter at 500 degrees for 5 hours, and then sinter at 900 degrees for 15 hours to obtain the lithium-rich manganese-based positive electrode material Li 1.2 mn 0.53 Ni 0.26 o 2 . 1g lithium-rich manganese-based cathode material Li 1.2 mn 0.53 Ni 0.27 o 2 Mix with 0.0224g diammonium hydrogen phosphate and 0.0495g cobalt nitrate in a solution of ethanol:water=3:1, Co:P:TM=1:1:50 (mass ratio), add acid:TM molar ratio is 1: 200 oxalic acid, mixed for 2 hours, evaporated the solution to dryness at 70°C, sintered the obtained solid powder in air, raised the temperature to 600°C at a rate of 2°C / min and kept it for 5h to obtain Li-Co-PO 4 Modified materials of cladding and spinel heterostructures. The modified lithium-rich manganese-based positive electrode material prepared by the above method, acetylene black and PVDF were uniformly mixed at a mass ratio of 8:1:1 to make a ...

Embodiment 2

[0051] Mix the lithium-rich material precursor with lithium carbonate, where TM:Li=1:1.5, mix evenly, sinter at 500 degrees for 5 hours, and then sinter at 900 degrees for 15 hours to obtain the lithium-rich manganese-based positive electrode material Li 1.2 mn 0.53 Ni 0.26 o 2 . 1g lithium-rich manganese-based cathode material Li 1.2 mn 0.53 Ni 0.27 o 2 Mix with 0.0112g diammonium hydrogen phosphate and 0.0365g aluminum nitrate in a solution of ethanol:water=3:1, Al:P:TM=1:1:100 (mass ratio), add acid: TM molar ratio is 1: 200 oxalic acid, mixed for 2 hours, evaporated the solution to dryness at 70°C, sintered the obtained solid powder in air, raised the temperature to 600°C at a rate of 2°C / min and kept it for 5h to obtain Li-Al-PO 4 Modified materials of cladding and spinel heterostructures. The retention rate of the modified material after 200 cycles is 83%, which is better than 44% of the original sample, and the rate performance is greatly improved. It can provid...

Embodiment 3

[0053] Mix the lithium-rich material precursor with lithium carbonate, where TM:Li=1:1.5, mix evenly, sinter at 500 degrees for 5 hours, and then sinter at 900 degrees for 15 hours to obtain the lithium-rich manganese-based positive electrode material Li 1.2 mn 0.53 Ni 0.26 o 2 . 1g lithium-rich manganese-based cathode material Li 1.2 mn 0.53 Ni 0.27 o 2 Mix with 0.0126g boric acid and 0.0365g manganese nitrate in a solution of ethanol:water=3:1, Mn:B:TM=1:1:100 (mass ratio), mix for 2 hours, and evaporate the solution to dryness at 70°C , the obtained solid powder was sintered in air, and the temperature was raised to 700°C at a rate of 2°C / min and kept for 5h to obtain Li-Mn-PO 4 Modified materials of cladding and spinel heterostructures. The retention rate of the modified material after 200 cycles is 78%, which is better than 44% of the original sample, and its capacity at high rate 10C is 142mAh / g, which is better than the original sample.

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Abstract

The invention provides an ion conductor and heterostructure co-modified lithium ion battery positive electrode material and a preparation method and application thereof. The modified lithium ion battery positive electrode material is coated by an ion conductor and is co-acted with a heterostructure; the modified lithium ion battery positive electrode material comprises an ion conductor coating layer, a heterostructure layer and a material body, the ion conductor coating layer is formed by reaction of a polyanionic compound, doped element salt and residual lithium on the surface of the material, and the phase of the heterostructure layer is a spinel phase or / and a rock salt phase and is located between the coating layer and the material body. The preparation method comprises the following steps of uniformly mixing lithium ion battery positive electrode material powder with polyanionic salt, doped element salt, weak acid and other compounds in a solution, drying by distillation, and sintering to obtain the product. The product obtained by the invention is used in energy storage equipment.

Description

technical field [0001] The invention relates to a lithium ion battery positive electrode material, a preparation method and application thereof, in particular to a lithium ion battery positive electrode material modified jointly by an ion conductor and a heterostructure, a preparation method and an application thereof. Background technique [0002] Lithium-ion batteries are currently the most promising chemical energy storage power sources, and are widely used in research and development fields such as portable electronic devices, electric vehicles (EVs), and smart grids. [0003] Cathode material is the key material of lithium-ion battery and plays a decisive role in the performance of the battery. It mainly includes layered lithium cobaltate, layered lithium nickelate, spinel-type lithium manganate, layered ternary materials, layered lithium-rich manganese-based cathode materials, etc. In the actual application process, it is found that the positive electrode materials of...

Claims

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Application Information

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IPC IPC(8): H01M4/62H01M4/36H01M4/505H01M4/525H01M10/0525
CPCH01M4/366H01M4/624H01M4/628H01M4/505H01M4/525H01M10/0525H01M2004/021H01M2004/028Y02E60/10
Inventor 张春晓韦伟峰王天硕江文俊何玮涛
Owner CENT SOUTH UNIV
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