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Preparation method of vanadium-molybdenum-doped lithium ion battery cathode material

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of poor cycle stability of lithium-ion batteries, and achieve good rate discharge performance, uniform crystal particles, and good reversibility.

Inactive Publication Date: 2017-03-22
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor cycle stability of existing lithium-ion batteries, and provide a method for preparing vanadium and molybdenum-doped lithium-ion battery cathode materials

Method used

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  • Preparation method of vanadium-molybdenum-doped lithium ion battery cathode material
  • Preparation method of vanadium-molybdenum-doped lithium ion battery cathode material
  • Preparation method of vanadium-molybdenum-doped lithium ion battery cathode material

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specific Embodiment approach 1

[0025] Specific embodiment one: the preparation method of a kind of vanadium, molybdenum doped lithium-ion battery cathode material of this embodiment is carried out according to the following steps:

[0026] 1. According to the chemical formula Li 1.2 mn 0.54-x-y co 0.13 Ni 0.13 V x Mo y o 2 The molar ratio of Li element to Mn element is 1.2:0.54-x-y, the molar ratio of Li element to Co element is 1.2:0.13, the molar ratio of Li element to Ni element is 1.2:0.13, and the molar ratio of Li element to V element The molar ratio of x, Li element and Mo element is 1.2:y and the molar ratio of Li element and complexing agent is 1.2:2, and lithium source, manganese source, cobalt source, nickel source, vanadium source, molybdenum source Mix with a complexing agent, then dissolve in deionized water to obtain a mixed solution;

[0027] x=0.01~0.03, y=0.01~0.03 described in step 1;

[0028] The ratio of the sum of the amounts of Li, Mn, Co, Ni, V, Mo and the complexing agent to...

specific Embodiment approach 2

[0031] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the lithium source described in step one is Li 2 CO 3 and LiCH 3 COO·H 2 One of O or a mixture of both. Other steps and parameters are the same as those in the first embodiment.

[0032] In this embodiment, when the lithium source is a mixture, various lithium sources can be combined in any ratio.

specific Embodiment approach 3

[0033] Specific embodiment three: the difference between this embodiment and one of the specific embodiments one to two is: the vanadium source described in step one is V 2 o 5 and NH 4 VO 3 one or a mixture of both. Other steps and parameters are the same as those in the specific embodiment 1 to 2.

[0034] In this embodiment, when the vanadium source is a mixture, various vanadium sources can be combined in any ratio.

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Abstract

The invention belongs to the field of ion batteries, particularly relates to a preparation method of vanadium-molybdenum-doped lithium ion battery cathode material, and is intended to solve the problem that an existing lithium ion battery has poor cycle stability. The preparation method comprises the steps of first, mixing a lithium source, a manganese source, a cobalt source, a nickel source, a vanadium source, a molybdenum source and a complexing agent, and dissolving in deionized water; second, adjusting pH, and drying; third, pre-burning, calcining, and cooling to room temperature to obtain the vanadium-molybdenum-doped lithium ion battery cathode material. The vanadium-molybdenum-doped lithium ion battery cathode material synthesized herein has uniform crystal particles; charge-discharge testing indicates that the cathode material has higher capacity retention ratio; cyclic voltammetry testing indicates that the material has good reversibility.

Description

technical field [0001] The invention belongs to the field of ion batteries, and in particular relates to a preparation method of vanadium and molybdenum doped lithium ion battery cathode materials. Background technique [0002] Since lithium-ion batteries have the highest energy density among commercial secondary batteries, they are highly valued by many electric vehicle battery research and development units. Since the performance of lithium-ion batteries depends largely on the cathode materials, the research on cathode materials for lithium-ion batteries has become a current research hotspot. Among them, the ternary lithium-rich manganese-based cathode material xLi 2 mn 2 o 3 ·(1-x)LiMO 2 (M=Ni, Co, Mn) After the first activation, charge and discharge at a small current can get 250mAh·g -1 The above reversible capacity is close to its theoretical capacity, and it is a promising positive electrode material. [0003] But since Li 2 mn 2 o 3 The electronic conductivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M10/0525
CPCH01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 赵力吴清
Owner HARBIN INST OF TECH
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