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High-potential lithium ion battery NCM ternary anode material and manufacturing method thereof

A technology for lithium ion batteries and cathode materials, which is applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as poor electrochemical cycle performance, and achieve the goal of improving lithium ion conductivity, stability, and processing performance. Effect

Inactive Publication Date: 2019-12-03
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to aim at lithium-ion battery cathode material layered high nickel nickel cobalt lithium manganese oxide NCM811 (LiNi 0.8 mn 0.1 co 0.1 o 2 ) and its derivatives have the disadvantages of poor electrochemical cycle performance, especially in the case of high cut-off voltage, providing a high-valence Si that suppresses the generation of microcracks during cycling 4+ Gradient doping bound Li on the surface 2 SiO 3 Coated modified lithium ion battery cathode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x-y Si x o 2 @(Li 2 SiO 3 ) y and its preparation method, wherein 0

Method used

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  • High-potential lithium ion battery NCM ternary anode material and manufacturing method thereof
  • High-potential lithium ion battery NCM ternary anode material and manufacturing method thereof
  • High-potential lithium ion battery NCM ternary anode material and manufacturing method thereof

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Experimental program
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Effect test

Embodiment 1

[0029] When the total doping amount of Si is 0.01, that is, x+y=0.01; by weighing 2.7324g precursor, 0.018g nano-SiO 2 And mix evenly, use alcohol as a dispersant, fully grind evenly, then put it in an oven to dry and grind to obtain a mixture 1 (such as figure 2 shown); with alcohol as a dispersant, weigh 1.34g lithium hydroxide monohydrate (LiOH·H 2 O) and fully grind the mixture 1 obtained before to obtain the mixture 2; finally put the dried mixture 2 into the tube furnace under an oxygen atmosphere (oxygen flow rate 400ml / min) and heat up to 480°C at a speed of 3°C / min Pre-fire for 6 hours, then heat up to 780°C for 15 hours at a rate of 2°C / min, then cool down to room temperature naturally, take out the material and grind it finely and sieve it to obtain the lithium ion positive electrode material (such as figure 1 shown).

[0030] Carry out XRD test to above-mentioned lithium ion cathode material, its result is as follows image 3 As shown; the material presents a p...

Embodiment 2

[0034] When the total doping amount of Si is 0.02, that is, x+y=0.02, take 2.7048g precursor and 0.036g nano-SiO 2 And mix evenly, use alcohol as a dispersant, fully grind evenly, then put it in an oven to dry and grind to obtain a mixture 1; use alcohol as a dispersant, and then weigh 1.36g lithium hydroxide monohydrate (LiOH·H 2 O) and fully grind the mixture 1 obtained before to obtain the mixture 2; finally put the dried mixture 2 into the tube furnace under an oxygen atmosphere (oxygen flow rate 400ml / min) and heat up to 500°C at a speed of 3°C / min Pre-fired for 6 hours, then heated up to 800°C at a rate of 2°C / min and baked for 15 hours, then cooled down to room temperature naturally, and the material was taken out and ground and sieved to obtain the lithium ion cathode material.

[0035] The constant current charge and discharge test was carried out on the above-mentioned lithium ion positive electrode material. From the test results, it can be seen that the positive el...

Embodiment 3

[0037] When the total doping amount of Si is 0.02, that is, x+y=0.02, weigh 2.7048g of the precursor, then weigh a proportional amount of tetraethyl orthosilicate, add it to an appropriate amount of absolute ethanol and mix it evenly, and add it to the precursor , using alcohol as a dispersant, fully ground evenly, then put it in an oven to dry and grind to obtain a mixture 1; using alcohol as a dispersant, weigh 1.36g of lithium hydroxide monohydrate (LiOH·H 2 O) and fully grind the mixture 1 obtained before to obtain the mixture 2; finally put the dried mixture 2 into the tube furnace under an oxygen atmosphere (oxygen flow rate 400ml / min) and heat up to 480°C at a speed of 3°C / min Pre-fire for 8 hours, then heat up to 800°C at a rate of 2°C / min and bake for 15 hours, then cool down to room temperature naturally, take out the material, grind it and sieve it to obtain the lithium ion cathode material.

[0038]The constant current charge and discharge test was carried out on t...

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Abstract

The invention belongs to the lithium ion battery field and relates to a lithium ion battery anode material and a manufacturing method thereof. The invention especially relates to a high-potential lithium ion battery NCM ternary anode material and the manufacturing method thereof, which is used for overcoming a defect of poor electrochemical cycle performance of existing lithium ion battery anode material layered high-nickel lithium-nickel-cobalt manganate NCM811 and derivatives. A molecular expression of the anode material is Li (Ni0. 8Co0. 1Mn0. 1) 1-x-ySixO2 @ (Li2SiO3) y, wherein x+y is greater than 0 and is less than or equal to 0.2, and y is much less than x. Li2SiO3 coating modification formed by combining high-valence state Si < 4 + > gradient doping for inhibiting generation of micro-cracks in a circulation process and a surface is adopted. The lithium ion battery anode material has a relatively high specific discharge capacity and excellent cycling stability and a high-rate charge-discharge cycling requirement can be satisfied. Bulk phase doping is performed by adopting a traditional solid phase method, operation is simple, industrial production is easy, a prepared productis high in purity, high in chemical uniformity, high in crystallization quality, fine in product particle, and uniform in distribution, and electrochemical performance is excellent and manufacturingcost is low.

Description

technical field [0001] The invention belongs to the field of lithium ion batteries, and relates to a lithium ion battery positive electrode material and a preparation method thereof, in particular to a lithium ion battery positive electrode material Li(Ni 0.8 co 0.1 mn 0.1 ) 1-x-y Si x o 2 @(Li 2 SiO 3 ) y and a preparation method thereof, wherein 0<x+y≤0.2. Background technique [0002] Due to its high energy density, low self-discharge, excellent cycle stability and no memory effect, lithium-ion batteries have become a vital part of the power battery field in the current new energy vehicle industry. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, separators and electrolytes; among them, the current industrialized lithium-ion battery positive electrode materials mainly include: lithium cobalt oxide, lithium manganate, lithium iron phosphate and ternary positive electrode materials; ternary positive electrod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/505H01M4/525H01M4/485H01M10/0525H01M4/58H01M4/36
CPCH01M4/505H01M4/525H01M4/485H01M10/0525H01M4/5825H01M4/366Y02E60/10
Inventor 刘兴泉冉淇文李蕾刘金涛郝帅何泽珍胡友作李浩肖雨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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