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Circulation improvement type lithium and manganese-rich solid solution battery

A solid solution, lithium-rich manganese technology, applied in secondary batteries, circuits, electrical components, etc., can solve problems such as poor cycle performance and unstable structure of lithium-rich manganese cathode materials, and achieve improved cycle life, high capacity, and reduced production costs low effect

Active Publication Date: 2015-01-14
WANXIANG 123 CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a cycle-improved lithium-rich manganese solid solution lithium-ion battery in order to solve the unstable structure and poor cycle performance of the existing lithium-rich manganese positive electrode materials in the cycle process

Method used

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  • Circulation improvement type lithium and manganese-rich solid solution battery

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Experimental program
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Effect test

Embodiment 1

[0022] The positive active material is 0.5Li[Li 1 / 3 mn 2 / 3 ]O 2 0.5LiNi 1 / 3 co 1 / 3 mn 1 / 3 o 2 , the conductive agent is a mixture of carbon nanotubes and carbon nanofibers, the positive electrode binder is polyvinylidene fluoride, and the mass percentages of each component are: positive electrode active material 90%, positive electrode conductive agent 4% (wherein carbon Nanotube 1%, carbon nanofiber 3%) and positive electrode binder 6%.

[0023] The negative electrode active material is a mixed material of artificial graphite and soft carbon, the negative electrode conductive agent is a mixture of conductive carbon black and carbon nanotubes, the negative electrode binder is sodium carboxymethyl cellulose and styrene-butadiene rubber, and the mass percentage of each component is For: artificial graphite 65%, soft carbon 25%, conductive carbon black 4%, carbon nanotube 2%, carboxymethyl cellulose sodium 1.8% and styrene-butadiene rubber 2.2%.

[0024] In the electrolyte...

Embodiment 2

[0027] The positive active material is 0.2Li[Li 1 / 3 mn 2 / 3 ]O 2 0.8LiNi 1 / 2 mn 1 / 2 o 2, the conductive agent is a mixture of carbon nanotubes and carbon nanofibers, the binder is polyvinylidene fluoride, and the mass percentage of each component is: positive electrode active material 84%, conductive agent 8% (wherein carbon nano tube 3%, carbon nanofiber 5%), and positive electrode binder 8%.

[0028] Negative electrode active material is artificial graphite, natural graphite and soft carbon mixed material, conductive agent is conductive carbon black, carbon nanotube, binder is sodium carboxymethyl cellulose and styrene-butadiene rubber, and the mass percent content of each component is : Artificial graphite 50%, natural graphite 25%, soft carbon 10%, conductive carbon black 4%, superconducting carbon 4%, carbon nanotube 1%, carboxymethyl cellulose sodium 2.5%, styrene-butadiene rubber 3.5%.

[0029] In the electrolyte, the lithium salt concentration is 1.0mol / L, wherein...

Embodiment 3

[0032] The positive active material is 0.6Li[Li 1 / 3 mn 2 / 3 ]O 2 0.4LiNi 0.8 mn 0.15 Mg 0.05 o 2 , the conductive agent is a mixture of carbon nanotubes and carbon nanofibers, the binder is polyvinylidene fluoride, and the mass percentage of each component is: positive electrode active material 75%, conductive agent 10% (wherein carbon nano tube 3%, carbon nanofiber 5%), positive electrode binder 15%.

[0033] The negative electrode active material is a mixed material of natural graphite and soft carbon, the conductive agent is conductive carbon black, superconducting carbon, the binder is sodium carboxymethyl cellulose and styrene-butadiene rubber, and the mass percentage of each component is: natural graphite 60%, soft carbon 20%, conductive carbon black 7%, superconducting carbon 5%, sodium carboxymethyl cellulose 3.6%, styrene-butadiene rubber 4.4%.

[0034] In the electrolyte, the lithium salt concentration is 0.8mol / L, wherein LiBOB accounts for 25% of the total li...

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Abstract

The invention relates to a circulation improvement type lithium and manganese-rich solid solution batteryincluding a positive electrode, a negative electrode and an electrolyte, wherein the positive electrode comprises a positive electrode active material, a positive electrode conductive agent and a positive electrode binder, the negative electrode includes a negative electrode active material, a negative electrode binder and a negative electrode conductive agent, and the circulation improvement type lithium and manganese-rich solid solution batteryis characterized in that, the electrolyte includes a lithium salt, an organic solvent, a film forming additive, a stabilizer and auxiliaries; the and the auxiliary are methyl trifluoromethansulfonate and 4, 4 '-sulfonyl diphenylamine. The invention provides a circulation improvement type lithium and manganese-rich solid solution batterywhich has the advantages of low cost and high capacity, and on the premise of satisfying the multiplying power performance and high and low temperature performance of a normal lithium and manganese-rich solid solution lithium ion battery, the circulation life of the battery system is obviously increased.

Description

technical field [0001] The invention belongs to the field of batteries, and relates to a lithium ion battery, in particular to a cycle-improved lithium-rich manganese solid solution lithium ion battery. [0002] Background technique [0003] Lithium-ion batteries have been widely used since their commercialization in the early 1990s. The principle of this battery is to rely on the different deintercalation-insertion reaction potentials of lithium ions in the positive and negative active materials to obtain a potential difference. Lithium ions flow between the positive and negative electrodes, which is vividly called a rocking chair battery. With the development of the economy and the improvement of people's living standards, people's demand and requirements for power batteries are getting higher and higher. Therefore, power batteries with low cost, good safety, high energy and high density will become an inevitable trend of its development. [0004] In recent years, li...

Claims

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Application Information

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IPC IPC(8): H01M10/0567
CPCH01M10/0525H01M10/0567Y02E60/10
Inventor 周伟瑛吕豪杰
Owner WANXIANG 123 CO LTD
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