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Lithium-rich manganese-based cathode material and preparation method thereof, positive electrode piece and lithium ion secondary battery

A positive electrode material, lithium-rich manganese-based technology, applied in the field of lithium-ion secondary batteries, can solve the problem of low charge and discharge efficiency in the first phase, and achieve high energy density, simple process, and low cost

Inactive Publication Date: 2019-07-12
SHANGHAI CENAT NEW ENERGY +4
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem that the initial charge and discharge efficiency of existing lithium-rich manganese-based cathode materials is very low, a lithium-rich manganese-based cathode material with high initial charge-discharge efficiency is needed

Method used

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  • Lithium-rich manganese-based cathode material and preparation method thereof, positive electrode piece and lithium ion secondary battery
  • Lithium-rich manganese-based cathode material and preparation method thereof, positive electrode piece and lithium ion secondary battery
  • Lithium-rich manganese-based cathode material and preparation method thereof, positive electrode piece and lithium ion secondary battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] Synthesis of Sodium-Containing Layered Composite Metal Oxide Precursor Na 0.8 Li 0.12 Ni 0.22 mn 0.66 o 2 .

[0093] The method is, a certain amount of Na 2 CO 3 , Li 2 CO 3 , Mn(CH 3 COO) 2 4H 2 O,Ni(CH 3 COO) 2 4H 2 O, mix the raw materials in a mortar after weighing, then heat to 300°C in a pre-fired furnace to obtain a gel-like mixture, continue to heat at 300°C for 4 hours, cool and pulverize in the grinding and grind. Then the mixture is poured into a ball mill jar, and the fully mixed powder is mixed by ball milling, pressed into a tablet under a pressure of 10-20Mpa, then put into a refractory crucible, and calcined in air at a temperature of 750°C for 12 Hour. After natural cooling, crushing and grinding, the powdery precursor Na 0.8 Li 0.12 Ni 0.22 mn 0.66 o 2 .

[0094] The precursor Na prepared by the above method 0.8 Li 0.12 Ni 0.22 mn 0.66 o 2 in LiNO 3 -LiI medium for ion exchange.

[0095] The specific method is to add the pr...

Embodiment 2

[0108] This example synthesizes the sodium-containing layered composite metal oxide precursor Na 1.0 Li 0.2 Ni 0.2 mn 0.6 o 2 , and perform ion exchange.

[0109] Precursor Na 1.0 Li 0.2 Ni 0.2 mn 0.6 o 2 The synthesis method is basically the same as that described in Example 1. According to Na 1.0 Li 0.2 Ni 0.2 mn 0.6 o 2 composition, adjust Na 2 CO 3 , Li 2 CO 3 , Mn(CH 3 COO) 2 4H 2 O,Ni(CH 3 COO) 2 4H 2 The proportion of raw materials such as O.

[0110] At the same time, the precursor Na prepared by the above method 0.8 Li 0.12 Ni 0.22 mn 0.66 o 2 Prepare lithium-rich manganese-based positive electrode material Li by the ion exchange method described in Example 1 1.2 Ni 0.2 mn 0.6 o 2 .

[0111] The precursor Na obtained in this example 1.0 Li 0.2 Ni 0.2 mn 0.6 o 2 The measurement results of the synthetic powder X-ray diffraction measurement show that: the precursor Na 0.8 Li 0.12 Ni 0.22 mn 0.66 o 2 The crystal structure belong...

Embodiment 3

[0114] This example is synthesized with sodium-containing layered composite metal oxide P2 type Na 0.67 Li 0.08 Ni 0.23 mn 0.69 o 2 Precursors for ion exchange.

[0115] Among them, P2 type Na 0.67 Li 0.08 Ni 0.23 mn 0.69 o 2 The synthesis method of the precursor is basically similar to that of the P3 type precursor described in Example 1. Due to the high synthesis temperature of the P2 compound, the sintering conditions were adjusted to sinter at 900 for 24 hours. All the other steps are the same as in Example 1.

[0116] The P2 type Na prepared by the above method 0.67 Li 0.08 Ni 0.23 mn 0.69 o 2 Precursor is prepared cathode material Li by the ion exchange method described in embodiment 1 1.08 Ni 0.23 mn 0.69 O.

[0117] Na synthesized in this example 0.67 Li 0.08 Ni 0.23 mn 0.69 o 2 The crystal structure of the precursor belongs to the P2 type layered structure. In addition, no other impurities were observed, and it belonged to a single phase.

[...

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Abstract

The invention discloses a lithium-rich manganese-based cathode material and a preparation method thereof, a positive electrode piece and a lithium ion secondary battery. A sodium-containing layered composite metal oxide NaaLixNiyMnzM1-x-y-zO2 is taken as a precursor, the sodium-containing layered composite metal oxide NaaLixNiyMnzM1-x-y-zO2 is subjected to ion exchange in a fuse salt to prepare alithium-rich manganese-based cathode material having the chemical constitution of Lix+a+bNiyMnzM1-x-y-zO2, wherein 0.62<=a<=1, 0<=x<=0.4, 0<=y<=0.5, 0.5<=z<=1, and 1<=x+a+b<=1.5, M is at least one element in the group of Mg, Al, Ti, V, Fe, Co, Cu, Zn and Zr, and 0.7<=x+y+z<=1. The lithium-rich manganese-based cathode material is prepared through ion exchange in the novel fuse salt, has high energydensity, is more suitable for development of the high energy density cathode material, has very high first-time charge-discharge efficiency and good cycle features, and can effectively overcome the problems in the prior art.

Description

technical field [0001] The invention relates to a power battery, in particular to lithium ion secondary battery technology. Background technique [0002] In today's era of rapid development of information technology and automation technology, electrochemical energy storage devices such as supercapacitors and lithium-ion batteries play their unique functions. Lithium-ion secondary batteries have the characteristics of high capacity, high energy density, long life, no memory effect, and no pollution to the environment. Since the commercialization of Sony Corporation in early 1990, in the past 30 years, it has been widely used in Mobile phones, digital cameras, notebook computers and other portable electronic products. In recent years, due to the increasing number of traditional fuel vehicles, environmental problems such as deteriorating air quality have gradually emerged in some areas of the country. On the other hand, due to the political instability in oil-producing countr...

Claims

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Application Information

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IPC IPC(8): H01M4/485H01M4/505H01M4/525H01M4/131H01M10/0525
CPCH01M4/131H01M4/485H01M4/505H01M4/525H01M10/0525Y02E60/10
Inventor 赵文文张勍邹美靓
Owner SHANGHAI CENAT NEW ENERGY
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