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Anode material of lithium ion cell and its prepn method

A technology for lithium-ion batteries and cathode materials, which is applied in battery electrodes, circuits, electrical components, etc., and can solve problems such as infeasibility of large-scale production.

Inactive Publication Date: 2006-09-20
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the material is made by the sol-gel method, and industrial mass production is not feasible

Method used

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  • Anode material of lithium ion cell and its prepn method
  • Anode material of lithium ion cell and its prepn method
  • Anode material of lithium ion cell and its prepn method

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1, a kind of lithium-ion battery cathode material preparation method, carries out following steps successively:

[0022] 1), with Li: Mn: Al according to the molar ratio of 1: 1.96: 0.04 (ideal stoichiometric ratio in molecular formula) lithium carbonate Li 2 CO 3 and electrolytic manganese dioxide MnO 2 With Aluminum Hydroxide Al(OH) 3 After uniform mixing in a ball mill, heat treatment at 750°C for 20 hours to obtain lithium manganate LiAl with an average particle size of 10-15 μm 0.04 mn 1.96 o 4 . Zinc nitrate whose Zn weight accounts for 2% of the lithium manganate weight is also put into the ball mill and uniformly mixed with the lithium manganate to form a mixture. At this time, the zinc nitrate and lithium manganate were both in powder form.

[0023] 2), above-mentioned mixture is pressed into block under the pressure of 5MPa;

[0024] 3) The above-mentioned blocks were first incubated and reacted at 120°C for 2 hours, and then incubated at 50...

Embodiment 2

[0029] Embodiment 2, a kind of lithium-ion battery cathode material preparation method, carries out following steps successively:

[0030] 1), Li: Mn: Ni is mixed lithium carbonate Li according to the molar ratio of 1: 1.90: 0.1 (ideal stoichiometric ratio in molecular formula) 2 CO 3 and electrolytic manganese dioxide MnO 2 After uniformly mixing with nickel oxide NiO with a ball mill, heat treatment at 750°C for 20 hours to obtain lithium manganate LiNi with an average particle size of 10-15 μm 0.1 mn 1.9 o 4 . Zinc nitrate Zn (NO 3 ) 2 It is also placed in a ball mill and mixed evenly with lithium manganate to form a mixture. At this time, the zinc nitrate and lithium manganate were both in powder form.

[0031] 2), above-mentioned mixture is pressed into block under the pressure of 5MPa;

[0032] 3) The above-mentioned blocks were first incubated and reacted at 120°C for 2 hours, and then incubated at 400°C for 6 hours.

[0033] Adopt the battery cathode material o...

Embodiment 3

[0034] Embodiment 3, a kind of lithium-ion battery cathode material preparation method, carries out following steps successively:

[0035] 1), with Li:Mn:Co according to the molar ratio of 1:1.80:0.2 (ideal stoichiometric ratio in molecular formula) Li 2 CO 3 and electrolytic manganese dioxide MnO 2 with nickel oxide Co 2 o 3 After uniform mixing with a ball mill, heat treatment at 750°C for 20 hours to obtain lithium manganate LiCo with an average particle size of 10-15 μm. 0.2 mn 1.8 o 4 . Lithium nitrate LiNO with the sum of the weight of Li and Co accounting for 5% of the weight of lithium manganate 3 with cobalt nitrate Co(NO3) 2 It is also placed in a ball mill and mixed evenly with lithium manganate to form a mixture. At this time, lithium nitrate, cobalt nitrate and lithium manganate are all in powder form, LiNO 3 with Co(NO3) 2 They can be mixed with each other in any proportion.

[0036] 2), above-mentioned mixture is pressed into block under the pressure...

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Abstract

This invention discloses a method to prepare anode materials in lithium ion cells, which includes following steps: LiMxMn2-xO4 powder is adopted as substrate and mixed with low-melting-point salt powder to form a mixture. The melting point of low-melting-point salt is below 650 deg. C. In LiMxMn2-xO4, x is not less than 0.01 and not larger than 0.2 and M can be aluminium, cobalt, nickel or zincum. The metal amount in low-melting-point salt is 2~8wt% of LiMxMn2-xO4. The preceding mixture is pressed into blocks at a pressure of 4~8MPa. The blocks are kept first at 90~120 deg. C for 2~4.0 hours and then at 400~700 deg. C for 2~6.0 hours. Lithium ion cells which adopt anode materials prepared in this invention have relatively high capacitance and perform good circulative properties in wide potential ranges.

Description

technical field [0001] The invention relates to a lithium ion battery cathode material and a preparation method thereof. Background technique [0002] Lithium-ion battery is a new type of green high-energy rechargeable battery that appeared in the early 1990s, and has become the focus of research and development all over the world. Layered and spinel-type lithium transition metal oxides are considered as preferred cathode materials for high-energy-density lithium-ion batteries. [0003] The positive electrode material is an important part of the lithium-ion battery. During the charging and discharging process of the lithium-ion battery, it is not only necessary to provide the lithium required for the reciprocal intercalation / extraction in the positive and negative lithium intercalation compounds, but also to bear the burden of forming SEI on the surface of the negative electrode material. The lithium required by the membrane; therefore, the research and development of high-...

Claims

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Application Information

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IPC IPC(8): C01G45/12H01M4/58H01M4/505
CPCY02E60/10
Inventor 涂健赵新兵曹高劭朱铁军涂江平
Owner ZHEJIANG UNIV
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