Method for increasing initial coulomb efficiency of nickel-containing cathode material of lithium ion battery and application thereof

A lithium-ion battery and coulombic efficiency technology, which is applied in the field of electrochemistry, can solve the problems of increased alkalinity of synthetic positive electrode materials, increased gram capacity of sacrificial materials, and increased gas production, so as to achieve the optimal matching of first-time efficiency, improve first-time coulombic efficiency, and reduce The effect of excess amplitude

Active Publication Date: 2018-06-12
天津聚元新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, with the increase of Ni content in the reactant during the synthesis process, the cation mixing degree increases, and the material impedance becomes larger. On the contrary, with the increase of Li content in the reactant, the order degree of Li and Ni increases, and the impedance decreases. Therefore, adding excessive lithium in the synthesis process can reduce the occurrence of cation mixing, but the introduction of excessive lithium will cause the alkalinity of the synthesized positive electrode material to increase, which will affect the processing performance and stability of the material during the homo

Method used

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  • Method for increasing initial coulomb efficiency of nickel-containing cathode material of lithium ion battery and application thereof
  • Method for increasing initial coulomb efficiency of nickel-containing cathode material of lithium ion battery and application thereof
  • Method for increasing initial coulomb efficiency of nickel-containing cathode material of lithium ion battery and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0052] as attached figure 1 As shown, the positive electrode material of nickel cobalt lithium manganese oxide NCM523 with a charging capacity of 206mAh / g and an initial efficiency of 85% and the binder PVDF2% and conductive agent SP2% are used according to the ratio of the active material of the positive electrode material to 96%. 16.86mg / cm 2 The loading capacity of the pole piece is evenly coated on one side of the 12μ aluminum foil with an effective coating area of ​​20cm×15cm. The first charge capacity of this pole piece is 1000mAh. figure 1 Put it in the electrolyte in the same way, use a 1mm thick lithium sheet as the counter electrode, connect the aluminum foil and the lithium sheet to the positive and negative electrodes of the external power supply, charge with a current of 0.05C, that is, 50mAh for 2h, take out the positive electrode sheet, and take a part Pole sheet production The reversible capacity of the positive electrode material was tested with a 2320 button...

Embodiment 2

[0054] as attached figure 1 As shown, the positive electrode material of nickel cobalt lithium manganese oxide NCM523 with a charging capacity of 206mAh / g and an initial efficiency of 85% and the binder PVDF2% and conductive agent SP2% are used according to the ratio of the active material of the positive electrode material to 96%. 16.86mg / cm 2 The loading capacity of the pole piece is evenly coated on one side of the 12μ aluminum foil with an effective coating area of ​​20cm×15cm. The first charge capacity of this pole piece is 1000mAh. figure 1 Put it in the electrolyte in the same way, use a 1mm thick lithium sheet as the counter electrode, connect the aluminum foil and the lithium sheet to the positive and negative electrodes of the external power supply, charge with a current of 0.05C, that is, 50mAh for 3h, take out the positive electrode sheet, and take a part Pole sheet production The reversible capacity of the positive electrode material was tested with a 2320 button...

Embodiment 3

[0056] as attached figure 1 As shown, the positive electrode material of nickel cobalt lithium manganese oxide NCM523 with a charging capacity of 206mAh / g and an initial efficiency of 85% and the binder PVDF2% and conductive agent SP2% are used according to the ratio of the active material of the positive electrode material to 96%. 16.86mg / cm 2 The loading capacity of the pole piece is evenly coated on one side of the 12μ aluminum foil with an effective coating area of ​​20cm×15cm. The first charge capacity of this pole piece is 1000mAh. figure 1 Place it in the electrolyte in the best way, use a 1mm thick lithium sheet as the counter electrode, connect the aluminum foil and the lithium sheet to the positive and negative electrodes of the external power supply, and charge it to 4.4V with a current of 0.05C, that is, 50mAh constant current and constant voltage, 0.02 C is cut off, and then discharged to 2.75V with a current of 0.05C, the positive electrode piece is taken out, a...

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Abstract

The invention relates to a method for increasing initial coulomb efficiency of a nickel-containing cathode material of a lithium ion battery and application thereof. The initial coulomb efficiency ofthe nickel-containing cathode material of the lithium ion battery is increased by partially separating lithium ions in a nickel-containing positive plate in advance through charge/discharge, and adjusting the initial charge gram volume of the nickel-containing cathode material by partially separating out lithium ions, without reducing the initial reversible discharge gram volume of the cathode material; in design of a whole battery, the initial coulomb efficiency of the cathode material in the lithium ion whole battery is made the same as the initial coulomb efficiency of a corresponding anodematerial, so as to reduce the excessive amplitude of the anode material and increase the energy density of the whole battery. The method provided by the invention has the following beneficial effects: by partially separating lithium ions in the nickel-containing positive plate in advance through charge/discharge, the initial coulomb efficiency of the cathode material is increased; the initial coulomb efficiency of the nickel-containing cathode material can be adjusted as required so as to obtain optimal initial efficiency matching when designing the whole battery is designed throughwith anodematerial matching.

Description

technical field [0001] The invention belongs to the field of electrochemistry, and in particular relates to a method for improving the first coulombic efficiency of a nickel-containing positive electrode material of a lithium ion battery and an application thereof. Background technique [0002] The positive electrode material used in lithium-ion batteries is one of the key materials for manufacturing lithium-ion batteries, and occupies a core position in lithium-ion batteries. At present, the positive electrode materials that have been industrialized mainly include lithium cobaltate, lithium manganese oxide, nickel-cobalt lithium manganese oxide ternary materials and lithium iron phosphate. Nickel-cobalt lithium manganate and nickel-cobalt lithium aluminate ternary materials have the advantages of high electrochemical capacity, good cycle performance, easy synthesis, and low raw material cost. In recent years, they have gradually replaced part of lithium cobalt oxide and hav...

Claims

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Application Information

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IPC IPC(8): H01M4/1391
CPCH01M4/1391Y02E60/10
Inventor 苏志江刘文刚吴亦斌孟洋高润明贾学恒
Owner 天津聚元新能源科技有限公司
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