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A kind of sodium-doped lithium-rich manganese-based positive electrode material for lithium ion battery and preparation method thereof

A lithium-ion battery, lithium-rich manganese-based technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of high cost, poor cycle stability, etc., to reduce application costs, improve discharge specific capacity and cycle stability Effect

Active Publication Date: 2017-01-11
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a sodium-doped lithium-rich manganese-based positive electrode material with high manganese content and a preparation method thereof. The material can solve the problem of the existing lithium-rich manganese-based positive electrode by adding doped sodium salt and a suitable doping ratio. Poor material cycle stability and high cost

Method used

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  • A kind of sodium-doped lithium-rich manganese-based positive electrode material for lithium ion battery and preparation method thereof
  • A kind of sodium-doped lithium-rich manganese-based positive electrode material for lithium ion battery and preparation method thereof
  • A kind of sodium-doped lithium-rich manganese-based positive electrode material for lithium ion battery and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The sodium-doped lithium-rich manganese-based cathode material prepared in this example is 0.5Li[Li 1 / 3 mn 2 / 3 ]O 2 0.5Li 0.84 Na 0.16 Ni 0.2 co 0.2 mn 0.6 o 2 (i.e. Li 1.09 Na 0.08 Ni 0.10 co 0.10 mn 0.63 o 2 ), the specific operations are as follows:

[0029] Weigh 0.0150mol of nickel sulfate, 0.0150mol of cobalt sulfate and 0.0945mol of manganese sulfate, and prepare the total concentration of nickel, cobalt and manganese as 1mol L with deionized water -1 124.50 mL of solution. Weigh 0.1370mol sodium carbonate and prepare 1mol L with deionized water -1 precipitant solution. Measure 0.7470mol NH 3 ·H 2 The concentrated ammonia water of O was diluted with deionized water to 1mol L -1 complexing agent solution. Add 10.00 mL of deionized water into a stirring reaction kettle with a constant temperature of 60° C., and adjust its pH value to 8.0 with ammonia water as the reaction bottom liquid. Then at 0.6mL·min -1 The transition metal salt solu...

Embodiment 2

[0031] The sodium-doped lithium-rich manganese-based cathode material prepared in this example is 0.4Li[Li 1 / 3 mn 2 / 3 ]O 2 0.6Li 0.90 Na 0.10 Ni 0.2 co 0.2 mn 0.6 o 2 (i.e. Li 1.07 Na 0.06 Ni 0.12 co 0.12 mn 0.63 o 2 ), the specific operations are as follows:

[0032] Accurately weigh 0.0180mol of nickel sulfate, 0.0180mol of cobalt sulfate and 0.0945mol of manganese sulfate, and prepare the total concentration of nickel, cobalt and manganese to 2mol L with deionized water -1 The solution of 65.25mL. Accurately weigh 0.1436mol sodium carbonate and prepare 2mol L with deionized water -1 precipitant solution. Measure 0.7830mol NH 3 ·H 2 The concentrated ammonia water of O was diluted with deionized water to 2mol L -1 complexing agent solution. 10.00 mL of deionized water was added into a stirring reaction kettle at a constant temperature of 60° C., and its pH value was adjusted to 7.0 with ammonia water as the reaction bottom liquid. Then at 0.6mL·min ...

Embodiment 3

[0034] The sodium-doped lithium-rich manganese-based cathode material prepared in this example is 0.7Li[Li 1 / 3 mn 2 / 3 ]O 2 0.3 Li 0.87 Na 0.13 Ni 0.2 co 0.2 mn 0.6 o 2 (i.e. Li 1.19 Na 0.04 Ni 0.06 co 0.06 mn 0.65 o 2 ), the specific operations are as follows:

[0035] Accurately weigh 0.0090mol of nickel sulfate, 0.0090mol of cobalt sulfate and 0.0975mol of manganese sulfate, and prepare the total concentration of nickel, cobalt and manganese into 0.5mol L with deionized water -1 The solution of 231.00mL. Accurately weigh 0.1238mol sodium carbonate and prepare 0.5mol L with deionized water -1 precipitant solution. Measure 0.6750mol NH 3 ·H 2 The concentrated ammonia water of O was diluted with deionized water to 0.5mol L -1 complexing agent solution. Add 15.00 mL of deionized water into a stirring reaction kettle with a constant temperature of 60° C., and adjust its pH value to 9.0 with ammonia water as the reaction bottom liquid. Then at 0.6mL·min -1 Th...

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PUM

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Abstract

The invention relates to a sodium doped lithium-rich manganese based cathode material for a lithium ion battery. The material is a sodium salt doped lithium-rich manganese based solid solution cathode material of which the general formula is xLi[Li1 / 3Mn2 / 3]O2.(1-x)LiNi0.2Co0.2Mn0.6O2, wherein x is equal to or greater than 0.4 and is equal to or less than 0.7, the doped quantity of sodium elements is 1-10% of the mol content of lithium elements, and the sodium salt is one selected from Na2CO3, Na2C2O4 and NaNO3. The mol content of ternary phase manganese of the sodium doped lithium-rich manganese based cathode material for the lithium ion battery is greater than 50%, and the manganese with high reserves and low price is used for replacing cobalt and nickel, so that the application cost can be reduced. Compared with the prior art, the sodium doping provided by the invention can improve the discharging specific capacity and the circulating stability of the rich lithium manganese based cathode material.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion battery cathode materials for chemical power sources, and relates to a sodium-doped lithium-rich manganese-based cathode material for lithium-ion batteries and a preparation method thereof. Background technique [0002] Lithium-ion batteries are widely used in portable electronic devices due to their high energy density, long cycle life, and environmental friendliness, and have good application prospects in the field of large-scale power batteries. Cathode materials, as the core of lithium-ion batteries, have attracted extensive attention from researchers. In recent years, lithium-rich manganese-based solid solution materials xLi 2 MnO 3 ·(1-x)LiMO 2 (M=Mn, Co, Ni 1 / 3 mn 2 / 3 、Ni 0.4 co 0.2 mn 0.4 、Ni 1 / 3 co 1 / 3 mn 1 / 3 etc.) because it is higher than 250mAh·g -1 The specific capacity has become a research hotspot. [0003] with traditional LiCoO 2 and LiFePO 4 Comp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/136H01M4/1397
CPCH01M4/362H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 韩恩山景其鸣朱令之
Owner HEBEI UNIV OF TECH
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