Lithium-ion battery graphene composite ternary anode material and preparation method thereof

A graphene composite, lithium-ion battery technology, applied in battery electrodes, electrical components, secondary batteries, etc., can solve problems such as poor rate performance, low conductivity and capacity decay, and achieve improved cycle performance and rate performance. Good rate performance, the effect of reducing the production process

Active Publication Date: 2019-06-11
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But at the same time, it also has disadvantages such as low conductivity, fast capacity decay, and poor rate performance.

Method used

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  • Lithium-ion battery graphene composite ternary anode material and preparation method thereof
  • Lithium-ion battery graphene composite ternary anode material and preparation method thereof
  • Lithium-ion battery graphene composite ternary anode material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] The preparation method of nickel-cobalt-manganese-lithium cathode material for lithium ion battery in this embodiment comprises the following steps:

[0033] (1) Weigh 0.79g of potassium permanganate and dissolve it in 50ml of deionized water, stir for 15 minutes to dissolve completely, then add 2ml of 37% hydrochloric acid dropwise to it, continue stirring for 15 minutes, then transfer to the reaction kettle, React at 140°C for 12 hours, centrifuge, wash, and dry at 70°C for 12 hours, transfer the resulting product to a crucible, and calcinate in a muffle furnace at 350°C for 6 hours to obtain the desired MnO 2 ;

[0034] (2) Weigh 0.5481g of lithium nitrate, 0.2174g of manganese dioxide, 0.7276g of cobalt nitrate nonahydrate, and 0.7270g of nickel nitrate nonahydrate and dissolve them in a mixed solution of 50ml of water and 50ml of ethanol, in order to compensate for the loss of lithium source during the calcination process , 6% excess lithium nitrate; ultrasonic fo...

Embodiment 2

[0037] In this embodiment, the preparation method of aluminum-doped nickel-cobalt-manganese-manganese-lithium positive electrode material for lithium ion battery comprises the following steps:

[0038] (1) Weigh 0.79g of potassium permanganate and dissolve it in 50ml of deionized water, stir for 15 minutes to dissolve completely, then add 2ml of 37% hydrochloric acid dropwise to it, continue stirring for 15 minutes, then transfer to the reaction kettle, React at 140°C for 12 hours, centrifuge, wash, and dry at 70°C for 12 hours, transfer the resulting product to a crucible, and calcinate in a muffle furnace at 350°C for 6 hours to obtain the desired MnO 2 ;

[0039] (2) Weigh 0.5481g lithium nitrate, 0.2174g manganese dioxide, 0.6620g cobalt nitrate nonahydrate, 0.7270g nickel nitrate nonahydrate, 0.0844g aluminum nitrate nonahydrate and dissolve them in a mixed solution of 50ml water and 50ml ethanol. Lithium source loss during calcination, lithium nitrate excess 6%; ultraso...

Embodiment 3

[0043] In this embodiment, the preparation method of aluminum-doped nickel-cobalt-manganese-manganese-lithium positive electrode material for lithium ion battery comprises the following steps:

[0044] (1) Weigh 0.79g of potassium permanganate and dissolve it in 50ml of deionized water, stir for 15 minutes to dissolve completely, then add 2ml of 37% hydrochloric acid dropwise to it, continue stirring for 15 minutes, then transfer to the reaction kettle, React at 140°C for 12 hours, centrifuge, wash, and dry at 70°C for 12 hours, transfer the resulting product to a crucible, and calcinate in a muffle furnace at 350°C for 6 hours to obtain the desired MnO 2 ;

[0045] (2) Weigh 0.5481g of lithium nitrate, 0.2174g of manganese dioxide, 0.6183g of cobalt nitrate nonahydrate, 0.7270g of nickel nitrate nonahydrate, and 0.1406g of aluminum nitrate nonahydrate and dissolve them in a mixed solution of 50ml of water and 50ml of ethanol. Lithium source loss during calcination, lithium n...

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Abstract

The invention discloses a lithium-ion battery graphene composite ternary anode material and a preparation method thereof. According to the anode material, first, a template method is used to synthesize an aluminum-doped nickel-cobalt-manganese-lithium oxide anode material; second, the aluminum-doped nickel-cobalt-manganese-lithium oxide anode material and graphene are added into deionized water and stirred uniformly, a hydrothermal reaction is performed, and the aluminum-doped nickel-cobalt-manganese-lithium oxide anode material/graphene composite anode material is obtained through centrifugation after cooling, washing and drying. According to the method, the advantages of the two materials can be integrated through compositing, so that electron conductivity and ion conductivity are improved, output power density of a battery is increased, the structural stability of the ternary material can be improved, and therefore the composite anode material with good circulation performance, highcapacity and large energy density is obtained.

Description

technical field [0001] The invention belongs to the technical field of battery materials, and in particular relates to a graphene composite ternary cathode material for a lithium ion battery and a preparation method thereof. Background technique [0002] Lithium-ion batteries are a new generation of secondary batteries developed on the basis of lithium primary batteries, and are widely used in small portable electronic communication products and electric vehicles. At present, the anode materials of lithium-ion batteries that have been industrialized mainly include lithium cobalt oxide, modified lithium manganate, lithium iron phosphate, and ternary materials. Although lithium cobaltate has stable performance, its cost is high and the cobalt element is poisonous, which may cause environmental pollution. Although spinel-type lithium manganese oxide is cheap, it has poor cycle performance due to the Jahn-Teller effect, and its electrochemical performance decays quickly due to ...

Claims

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Application Information

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IPC IPC(8): H01M4/36H01M4/485H01M4/505H01M4/525H01M4/62H01M10/0525
CPCY02E60/10
Inventor 朱继平郭鑫赵闪光严家伟杜向博文刘俐普丽咏
Owner HEFEI UNIV OF TECH
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