AnodePositive electrode material of lithium ion battery with porous laminated structure and preparation method thereof

A technology for lithium-ion batteries and positive electrode materials, applied in battery electrodes, structural parts, circuits, etc., can solve the problems of increased side reactions, decreased cycle stability, and failure to reach, and achieve improved contact, simplified preparation process, and long-term use. The effect of longevity

Active Publication Date: 2013-03-06
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large specific surface area of ​​these lithium-rich layered structure lithium-ion battery cathode materials with nano-scale particles, the side rea

Method used

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  • AnodePositive electrode material of lithium ion battery with porous laminated structure and preparation method thereof
  • AnodePositive electrode material of lithium ion battery with porous laminated structure and preparation method thereof
  • AnodePositive electrode material of lithium ion battery with porous laminated structure and preparation method thereof

Examples

Experimental program
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Example Embodiment

[0030] Example 1

[0031] 1) Dissolve 1.5g agar powder (agar powder, purified (RB), Sinopharm Chemical Reagent Co., Ltd.) in 100 mL deionized water, stir at 95°C to dissolve it to form a transparent hot agar solution. According to the molar ratio of 1.236:0.54:0.13:0.13, the raw material LiNO 3 , Mn(CH 3 COO) 2 ·4H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in the hot agar solution (3% excess lithium salt is added to offset the loss of lithium at high temperature) to form a red transparent solution. The red transparent solution contains lithium, nickel, manganese and cobalt salts The total concentration is 0.5mol / L. The obtained red transparent solution was cooled to 20°C to obtain a red jelly-like gel. Put the red jelly-like gel in a riot freezer and freeze to -20°C, and put the frozen cryogel in a freeze dryer at -60°C for 3 days to remove moisture from it to obtain an aerogel.

[0032] 2) Put the aerogel in a box furnace, heat it up to 500°C at a heating rat...

Example Embodiment

[0037] Example 2

[0038] 1) Dissolve 1.5g agar powder (agar powder, purified (RB), Sinopharm Chemical Reagent Co., Ltd.) in 100 mL deionized water, stir at 95°C to dissolve it to form a transparent hot agar solution. According to the molar ratio of 1.236:0.54:0.13:0.13, the raw material LiNO 3 , Mn(CH 3 COO) 2 ·4H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in the hot agar solution (3% excess lithium salt is added to offset the loss of lithium at high temperature) to form a red transparent solution. The red transparent solution contains lithium, nickel, manganese and cobalt salts The total concentration is 0.5mol / L. The obtained red transparent solution was cooled to 30°C to obtain a red jelly-like gel. Put the red jelly-like gel in a riot freezer and freeze to -20°C, and put the frozen cryogel in a freeze dryer at -50°C for 2 days to remove moisture from it to obtain an aerogel.

[0039] 2) Put the aerogel in a box furnace, heat it up to 550°C at a temperature...

Example Embodiment

[0044] Example 3

[0045] Dissolve 1.5g agar powder (agar powder, purified (RB), Sinopharm Chemical Reagent Co., Ltd.) in 100 mL deionized water, stir at 90°C to dissolve it to form a transparent hot agar solution. According to the molar ratio of 1.236:0.56:0.16:0.08, the raw material LiNO 3 , Mn(CH 3 COO) 2 ·4H 2 O, Ni(NO 3 ) 2 ·6H 2 O and Co(NO 3 ) 2 ·6H 2 O is dissolved in the hot agar solution (3% excess lithium salt is added to offset the loss of lithium at high temperature) to form a red transparent solution. The red transparent solution contains lithium, nickel, manganese and cobalt salts. The total concentration is 0.2mol / L. The obtained red transparent solution was cooled to 25°C to obtain a red jelly-like gel. Put the red jelly-like gel in a riot freezer and freeze to -20°C, and put the frozen cryogel in a freeze dryer at -60°C for 3 days to remove moisture from it to obtain an aerogel. Put the aerogel in a box furnace, heat it up to 450°C at a rate of 10°C / min in an ...

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Abstract

The invention discloses a preparation method of an anodepositive electrode material of a lithium ion battery with a porous laminated structure, which comprises the following steps that agar powder is dissolved in water to form a hot agar solution at the temperature of 90 to 99 DEG C; then lithium salt, nickel salt, manganese salt and cobalt salt are dissolved in the hot agar solution to form a red clear solution, the red clear solution is cooled to form red jellylike gel, and the red jellylike gel is frozen and freeze-dried to obtain aerogel; and the aerogel is calcined for 1 to 6 hours at the temperature of 400 to 600 DEG C, and then the aerogel is calcined for 10 to 30 hours at the temperature of 700 to 950 DEG C. When the anodepositive electrode material of the rich laminated lithium ion battery is formed, the micron porous morphology is kept, particles comes into good contact, even if in the condition that large primary particles are formed, good magnification performance is provided, and additionally, higher cycling stability is kept. The invention further discloses the anodepositive electrode material of the lithium ion battery with the porous laminated structure and a formed three-dimensional micron porous structure, and the anodepositive electrode material has good crystallinity.

Description

technical field [0001] The invention relates to the field of positive electrode materials for lithium ion batteries, in particular to a porous layered lithium ion battery positive electrode material and a preparation method thereof. Background technique [0002] Compared with traditional secondary batteries, lithium-ion batteries have the advantages of high platform voltage (about 3.2~3.7V), high energy density, and no memory effect. They have been used in mobile phones, cameras, notebook computers, portable appliances, etc. widely used. At present, lithium-ion batteries that have been commercially produced mainly use LiCoO 2 As the cathode material, LiCoO 2 It has high capacity and good stability, but this kind of cathode material has problems in performance, economy and environment. Ohzuku and Makimura et al. in the literature "Layered lithium-ion insertion type cathode material LiCo for lithium-ion batteries 1 / 3 Ni 1 / 3 mn 1 / 3 o 2 "(Chemistry Letters 7(2001) 642-643...

Claims

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Application Information

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IPC IPC(8): H01M4/505H01M4/525H01M4/1391H01M4/131
CPCY02E60/122Y02E60/10
Inventor 涂江平施少君唐阳洋张永起王秀丽谷长栋
Owner ZHEJIANG UNIV
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