Vanadium oxide composite high-nickel ternary positive electrode material, and preparation method and application thereof

A cathode material, a technology of vanadium oxide, applied in the field of vanadium oxide composite high-nickel ternary cathode material and its preparation, can solve the problems of hidden danger, poor material stability, high content, and achieve mild conditions, strong practicability and high cycle. The effect of stability

Pending Publication Date: 2021-09-21
SHANSHAN ENERGY (NINGXIA) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same potential, the high-nickel ternary cathode material released more lithium than the low-nickel ternary cathode material, resulting in Ni 4+ High content, Ni 4+ Has strong oxidizing properties and is easily reduced to Ni 3+ , thereby oxidizing the electrolyte to generate oxygen, which deteriorates the stability of the material and brings hidden dangers to practical applications.

Method used

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  • Vanadium oxide composite high-nickel ternary positive electrode material, and preparation method and application thereof
  • Vanadium oxide composite high-nickel ternary positive electrode material, and preparation method and application thereof
  • Vanadium oxide composite high-nickel ternary positive electrode material, and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0031] This embodiment provides a method for preparing a vanadium oxide composite high-nickel ternary positive electrode material, comprising the following steps:

[0032] (1) 1g of high-nickel ternary cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Mix evenly with 0.05 g of ammonium metavanadate, and mix well by ball milling for 1 hour, wherein the rotational speed of the ball mill is 400 rpm.

[0033] (2) Then put the ball-milled material into a tube furnace, heat up to 450° C. for sintering for 6 hours in an oxygen atmosphere, and the heating rate is 5° C. / min to obtain a vanadium oxide composite lithium-ion battery high-nickel ternary positive electrode material.

[0034] The X-ray diffraction pattern of the cathode material obtained in this embodiment is as follows figure 1 As shown, the main diffraction peaks are consistent with the diffraction peaks of high-nickel ternary cathode materials. After vanadium oxide compounding, the diffraction peaks did not move significant...

Embodiment 2

[0036] This embodiment provides a method for preparing a vanadium oxide composite high-nickel ternary positive electrode material, comprising the following steps:

[0037] (1) 1g of high-nickel ternary cathode material LiNi 0.85 co 0.1 mn 0.05 o 2 Mix evenly with 0.1 g of ammonium metavanadate, and thoroughly mix for 1 hour by ball milling, wherein the rotational speed of the ball mill is 400 rpm.

[0038] (2) Then put the ball-milled material into a tube furnace, heat up to 500°C for 4 hours in an oxygen atmosphere, and sinter at a rate of 5°C / min to obtain a high-nickel ternary cathode material for a lithium-ion battery composited with vanadium oxide. Its SEM such as figure 2 (d) shown. .

[0039] The processes of preparing electrodes and assembling batteries are the same as in Example 1. With a current density of 200mAg -1 When charging and discharging, the first discharge specific capacity can reach 138.7mAhg -1 , after 50 cycles, the discharge specific capacity ...

Embodiment 3

[0041] This embodiment provides a method for preparing a vanadium oxide composite high-nickel ternary positive electrode material, comprising the following steps:

[0042] (1) 1g of high-nickel ternary cathode material LiNi 0.8 co 0.1 mn 0.1 o 2 Mix evenly with 0.05 g of ammonium metavanadate, and mix well by ball milling for 1 hour, wherein the rotational speed of the ball mill is 400 rpm.

[0043] (2) Then put the ball-milled material into a tube furnace, heat up to 400° C. for sintering for 6 hours in an oxygen atmosphere, and the heating rate is 5° C. / min to obtain a vanadium oxide composite lithium-ion battery high-nickel ternary positive electrode material.

[0044] The processes of preparing electrodes and assembling batteries are the same as in Example 1. With a current density of 200mAg -1 When charging and discharging, the first discharge specific capacity can reach 110.4mAhg -1 , after 50 cycles, the discharge specific capacity is still 72.7mAhg -1 .

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Abstract

The invention provides a vanadium oxide composite high-nickel ternary positive electrode material, and a preparation method and application thereof. The preparation method comprises the following steps: (1) mixing ammonium metavanadate and a high-nickel ternary positive electrode material, and uniformly grinding; and (2) calcining the ground mixture. The vanadium oxide composite high-nickel ternary positive electrode material is applied to preparation of a lithium ion battery, the assembled lithium ion battery has relatively high cycling stability, the industrialization prospect of the high-nickel ternary positive electrode material is greatly improved, and the application scale of the high-nickel ternary positive electrode material in the lithium ion battery is greatly enlarged. In addition, the preparation method of the vanadium oxide composite high-nickel ternary positive electrode material is simple and controllable in technological process, mild in condition and high in practicability, and the vanadium oxide composite high-nickel ternary positive electrode material can be obtained through a two-step process.

Description

technical field [0001] The invention relates to the technical field of lithium-ion battery materials, in particular to a vanadium oxide composite high-nickel ternary positive electrode material and a preparation method and application thereof. Background technique [0002] The rapid development of the new energy electric vehicle industry has put forward higher requirements on the capacity and high rate discharge performance of lithium-ion batteries. The ternary cathode material has a large specific capacity and high energy density, which is a current research hotspot, and its actual discharge specific capacity can be higher than 200mAhg -1 , is widely considered to be the first choice for high energy density power lithium-ion batteries. In ternary materials, the Ni content mainly affects the energy density of the battery, the Co content mainly affects the reversible specific capacity of the battery, and the Mn content mainly affects the structural stability. However, high ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/505H01M4/525H01M4/62H01M10/0525
CPCH01M4/362H01M4/505H01M4/525H01M4/62H01M10/0525Y02E60/10
Inventor 吴建栋贾廷庆晁锋刚卢辉杨少林王泽晶马金福王北平侯春平盛之林
Owner SHANSHAN ENERGY (NINGXIA) CO LTD
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