Prelithiated positive electrode material for lithium ion secondary battery

A secondary battery and positive electrode material technology, applied in the direction of secondary batteries, battery electrodes, nanotechnology for materials and surface science, etc., can solve the problems of strict environmental control requirements, complex processes, etc., and achieve good stability, The effect of improving the first delithiation capacity

Inactive Publication Date: 2016-10-26
WANXIANG 123 CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the current pre-lithiation technology has disadvantages such as complex process and strict environmental control requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Place analytically pure lithium fluoride in a ball mill protected by an inert atmosphere, and ball ink for 12 hours to obtain nanometer lithium fluoride for use;

[0019] (2) According to 88g positive electrode active material lithium nickel cobalt manganese ternary material LiNi 0.5 co 0.2 mn 0.3 o 2 , 0.5g conductive agent acetylene black, 0.7g binder PVDF, 2g nano-lithium fluoride Weigh each component, and add each component into an organic solvent to make a positive electrode slurry.

Embodiment 2

[0021] (1) Place the analytically pure lithium fluoride in a ball milling equipment protected by an inert atmosphere, and ball ink for 20 hours to obtain nanometer lithium fluoride for use;

[0022] (2) According to 90g positive electrode active material lithium nickel cobalt manganese ternary material LiNi0.4Co0.2Mn0.4O 2 , 2g conductive agent acetylene black and Ketjen black (mass ratio 1:1), 2g binder PVDF, 5g nano-lithium fluoride Weigh each component, add each component to an organic solvent to make a positive electrode slurry material.

Embodiment 3

[0024] (1) Place analytically pure lithium fluoride in a ball mill protected by an inert atmosphere, and ball ink for 48 hours to obtain nanometer lithium fluoride for use;

[0025] (2) According to 88-95 parts of positive electrode active material lithium-rich manganese-based solid solution material 0.8Li 2 MnO 3 0.8LiMoO 2 , 3g of conductive agent Super P-Li, 4g of binder PVDF, and 10g of nano-lithium fluoride were weighed for each component, and each component was added to an organic solvent to make a positive electrode slurry.

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PUM

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Abstract

The invention discloses a prelithiated positive electrode material for a lithium ion secondary battery. The prelithiated positive electrode material for the lithium ion secondary battery is prepared from, by weight, 88 to 95 parts of a positive electrode active substance, 0.5 to 3 parts of a conductive agent, 0.7 to 4 parts of a bonding agent and 2 to 10 parts of nanometer lithium fluoride. According to the invention, a formula for the positive electrode material is optimized, and in particular, nanometer lithium fluoride is added; so the whole positive electrode material is prelithiated, has good stability, and can improve the initial delithiation capacity, initial charge and discharge efficiency and energy density of the battery.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material, in particular to a pre-lithiated lithium ion secondary battery cathode material. Background technique [0002] In recent years, the rapid development of portable electronic products / electric vehicles / energy storage power stations and other fields has put forward higher requirements for energy storage technology. Lithium-ion batteries are currently the first choice in these fields due to their high energy density, but they still cannot meet their energy density requirements. [0003] Lithium-ion batteries usually include the following components: positive and negative electrodes capable of intercalating / deintercalating or alloying / dealloying lithium ions, the positive and negative electrodes are directly filled with an electrolyte with lithium ion conduction, the positive and negative electrodes are Diaphragm with the function of isolating electronic conduction, and accessories such as co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/58H01M10/0525B82Y30/00
CPCB82Y30/00H01M4/362H01M4/485H01M4/505H01M4/525H01M4/582H01M10/0525Y02E60/10
Inventor 陈瑶刘学文沈书敏吕豪杰郑利锋
Owner WANXIANG 123 CO LTD
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