Lithium ion battery positive electrode material additive, positive electrode material, positive electrode and battery

A lithium-ion battery and cathode material technology, applied in the field of applied chemistry, can solve problems such as the irreversible capacity of lithium-ion batteries

Inactive Publication Date: 2017-05-10
SHANGHAI BYD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem that the existing additives are not the best solution for the irreversible capacity of lithium-ion batteries, the present invention provides a method that can better solve the irreversible capacity of lithium-ion batteries, and has simple process, lower cost and higher safety. High, can significantly improve the battery energy density lithium ion battery cathode material additive and the lithium ion battery cathode material prepared by the cathode material additive, cathode and battery

Method used

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  • Lithium ion battery positive electrode material additive, positive electrode material, positive electrode and battery
  • Lithium ion battery positive electrode material additive, positive electrode material, positive electrode and battery
  • Lithium ion battery positive electrode material additive, positive electrode material, positive electrode and battery

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Embodiment approach

[0033] Among them, the separator can be selected from various separators used in lithium-ion batteries known to those skilled in the art, such as polyolefin microporous membrane (PP), polyethylene felt (PE), glass fiber felt or ultrafine glass fiber paper or PP / PE / PP. As a preferred embodiment, the separator is PP / PE / PP.

[0034] The electrolyte contains lithium salt and non-aqueous solvent. The lithium salt can be lithium hexafluorophosphate, lithium tetrafluoroborate, lithium hexafluoroarsenate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium perfluorobutylsulfonate, aluminate One or more of lithium, lithium chloroaluminate, lithium fluorosulfonyl imide, lithium chloride and lithium iodide; the non-aqueous solvent can be γ-butyrolactone, ethyl methyl carbonate, methyl propyl carbonate , dipropyl carbonate, acid anhydride, N-methylpyrrolidone, N-methylformamide, N-methylacetamide, acetonitrile, N,N-dimethylformamide, sulfolane, dimethylsulfoxide, disulfite ...

Embodiment 1

[0039] Will Li 2 CO 3 、MoO 3 and B 2 o 3 Mix according to the molar ratio of 1:0.97:0.02, put it in a stirring ball mill, mix and grind for 8 hours; press the precursor prepared by fully mixing and grinding on a tablet machine, and then put it in a corundum crucible; put the crucible in a box furnace , start heating from room temperature at a heating rate of 5°C / min, heat to 700°C and bake for 10h, then cool naturally to room temperature to obtain Li 2 Mo 0.97 B 0.04 o 3.97 . Will Li 2 Mo 0.97 B 0.04 o 3.97 Put it in a corundum crucible, put the crucible into a tube furnace, and feed 10% H 2 / Ar mixed gas, heating from room temperature at a heating rate of 5 °C / min, heating to 900 °C and roasting for 10 h, then naturally cooling to room temperature to obtain Li 2 Mo 0.97 B 0.04 o 3 sample.

[0040] The prepared Li 2 Mo 0.97 B 0.04 o 3 The sample was analyzed by X-ray diffraction, and Li 2 Mo 0.97 B 0.04 o 3 The XRD spectrum of figure 1 .

Embodiment 2

[0042] LiOH, MoO 3 and H 3 BO 3 Mix according to the molar ratio of 2:0.925:0.1, place in a stirring ball mill, mix and grind for 6 hours; press the precursor prepared by fully mixing and grinding on a tablet machine, and then place it in a corundum crucible; put the crucible in a box furnace , start heating from room temperature with a heating rate of 5 °C / min, heat to 600 °C and bake for 20 h, then cool naturally to room temperature to obtain Li 2 Mo 0.925 B 0.1 o 3.925 . Will Li 2 Mo 0.925 B 0.1 o 3.925 Put it in a corundum crucible, put the crucible into a tube furnace, and feed 10% H 2 / Ar mixed gas, heating from room temperature at a heating rate of 5 °C / min, heating to 900 °C and then roasting for 30 h, then naturally cooling to room temperature to obtain Li 2 Mo 0.925 B 0.1 o 3 sample.

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Abstract

The invention provides a lithium ion battery positive electrode material additive, a lithium ion battery positive electrode material prepared by the positive electrode material additive, a positive electrode and a battery. The additive includes a lithium-containing additive, the lithium-containing additive is Li2Mo1-0.75xBxO3, wherein 0.04<=x<=0.3, the problem of irreversible capacities of the lithium ion battery can be effectively solved, the additive is simple and convenient in process, lower in cost and higher in safety, and the energy density of the battery can be remarkably improved.

Description

technical field [0001] The invention relates to the field of applied chemistry, in particular to a lithium ion battery positive electrode material additive and a lithium ion battery positive electrode material, positive electrode and battery prepared by using the positive electrode material additive. Background technique [0002] Lithium-ion batteries have the advantages of high voltage, no memory effect, high capacity and high power. They are currently ideal chemical power sources and are widely used in various portable electronic products. [0003] However, lithium ions have a certain irreversible capacity during the charge and discharge process. In order to reduce the decrease in battery capacity caused by the irreversible capacity of the battery during the first charge and discharge process, in the prior art, there is a method of adding dry powder to the surface of the negative electrode. Add lithium powder, or spray or drop organic lithium solution on the surface of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/36H01M4/58H01M10/0525
CPCH01M4/364H01M4/5825H01M10/0525Y02E60/10
Inventor 焦晓朋张百爽李世彩
Owner SHANGHAI BYD
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