Silicon cathode and lithium ion battery comprising same
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A silicon negative electrode, unsaturated technology, applied in the direction of battery electrodes, secondary batteries, electrode collector coatings, etc., can solve the problems of poor cycle performance and low specific capacity of silicon negative electrodes, so as to improve the rate performance and increase the porosity rate, the effect of preventing shedding
Active Publication Date: 2012-09-05
BYD CO LTD
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[0006] The purpose of the present invention is to provide a silicon negative electrode with high specific capacity and good cycle performance in order to overcome the shortcomings of the existing silicon negative electrode with low specific capacity and poor cycle performance
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Embodiment 1
[0040] (1) Preparation of silicon negative electrode active material
[0041] Si powder (1-5um, 99.9%, Kaihua Yuantong Silicon Industry Co., Ltd.), Ti powder (45um, 99%, Shenzhen Chemical Test Technology Co., Ltd.), Cu powder (45um, 99.9%, Beijing Haoyun Industry and Trade Co., Ltd.) ) as the initial raw material, mixed according to the mass ratio of 1:1:1, and then put into the QM-3SP4J planetary ball mill for 24 hours at a speed of 300r / min, and passed through a 400-mesh sieve after ball milling.
[0042] The obtained sample can detect Cu on the D / MAX2200PC XRD instrument produced by Rigaku Corporation. 3 Si, Si, Ti and Cu are present.
[0043] (2) Preparation of silicon negative electrode
[0044] Firstly, 6.7g of the second polymer PAN (Shangyu Wuyue Economic and Trade Co., Ltd., molecular weight 50,000) was dissolved in 221g of NMP, and then 6.7g of the first polymer PVDF (Shanghai Aifu New Material Co., Ltd., 7200#), 4.3 g of the third polymer PVP (Sinopharm Chemical ...
Embodiment 2
[0049] Silicon negative electrode and battery are prepared according to the same method as in Example 1, except that the first polymer in the binder is PTFE (polytetrafluoroethylene) (Zhejiang Juhua Group Import and Export Co., Ltd., molecular weight is 8 × 10 5 )
Embodiment 3
[0051] Silicon negative electrode and battery were prepared according to the same method as in Example 1, except that the second polymer in the binder was ethylene-acrylic acid copolymer (molecular weight was 200,000)
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Abstract
The invention provides a silicon cathode, which comprises a current collector and a silicon cathode material loaded on the current collector; the silicon cathode material comprises a silicon cathode active substance and an adhesive, wherein the adhesive comprises a first polymer, a second polymer and a third polymer; the first polymer is a fluorine-containing polymer; the second polymer is a polymer containing at least one of acrylonitrile unit, methacrylonitrile unit, acrylic ester unit and methacrylate unit; and the third polymer is one or more of polyvinylpyrrolidone, poly alkylene glycol,acrylamide and polyethylene glycol. Compared with the silicon cathode in the prior art, the silicon cathode has high specific capacity and good rate discharge characteristic, and particularly solves the problem of cycle performance of the silicon cathode in the prior art. Simultaneously, the invention also provides a good-performance battery comprising the silicon cathode.
Description
technical field [0001] The invention relates to a silicon negative pole and a lithium ion battery containing the silicon negative pole. Background technique [0002] Due to its small size and high energy density, lithium-ion secondary batteries are widely used as mainstream power sources in electronic products such as mobile communication equipment, digital cameras, and notebook computers. At present, the capacity of the secondary battery of the traditional lithium cobalt oxide / graphite system is close to its theoretical maximum capacity, and it is difficult to increase its volumetric energy density by increasing the dressing density, reducing the thickness of the current collector or the diaphragm, and other methods. With the upgrading of mobile electronic products, especially the advent of the mobile phone 3G era, there is an urgent requirement for the emergence of ultra-high capacity batteries. [0003] In recent years, silicon-based materials have been extensively and m...
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