本文選題：鋰離子電池　切入點(diǎn)：負(fù)極材料　出處：《廣西大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：金屬錫作為新型鋰離子電池負(fù)極材料,以其較高的比容量日益引起人們的廣泛關(guān)注。然而由于金屬錫電極在充放電過(guò)程中體積膨脹大,造成電極表面開(kāi)裂、活性物質(zhì)脫落等現(xiàn)象嚴(yán)重,大大降低了它的循環(huán)穩(wěn)定性,從而限制了金屬錫電極的實(shí)際應(yīng)用。解決此問(wèn)題的方法主要有將錫與其他元素組合,形成錫基合金、錫基氧化物或復(fù)合物。 本論文以石墨為陽(yáng)極,銅箔為陰極,在焦磷酸鹽電解液體系中分別用直流電沉積和脈沖電沉積技術(shù)制備了Sn-Cu合金負(fù)極材料,并用X-射線衍射(XRD)、掃描電子顯微鏡(SEM)、循環(huán)伏安(CV)、交流阻抗(EIS)和恒流充放電測(cè)試等手段研究了電沉積過(guò)程工藝因素對(duì)材料的組成結(jié)構(gòu)、微觀形貌和電化學(xué)性能的影響。 在直流電沉積過(guò)程中添加不同種類的氨基酸表面活性劑,可提高Sn-Cu合金負(fù)極材料的循環(huán)穩(wěn)定性和比容量。其中以氨基乙酸為添加劑,在電沉積時(shí)間4min和電流密度5mA·cm-2條件下,制備的合金電極0.1C的放電比容量為678.8mAh·g-1,0.5C的放電比容量為485.2mAh·g-1,循環(huán)50次后容量保持率為81.4%。 脈沖電沉積法制備Sn-Cu合金負(fù)極材料的條件：脈沖頻率10Hz,電流密度20mA·cm-2,占空比20%,脈沖時(shí)間5min(實(shí)際電沉積時(shí)間)。在此條件下,合金電極的0.1C的放電比容量為821.8mAh·g-1，，0.5C的放電比容量為494.5mAh·g-1,50次循環(huán)后容量保持率為66.0%。
[Abstract]:As a new type of anode material for lithium ion battery, metal tin has attracted more and more attention due to its high specific capacity. However, due to the large volume expansion of the metal tin electrode during charge and discharge, the surface of the electrode is cracked. The phenomenon of active substance shedding is serious, which greatly reduces its cycle stability and limits the practical application of metal tin electrode. The main solution to this problem is to combine tin with other elements to form tin base alloy. Tin based oxides or complexes. In this paper, Sn-Cu alloy anode materials were prepared by direct current electrodeposition and pulse electrodeposition in pyrophosphate electrolyte system with graphite as anode and copper foil as cathode. The effects of electrodeposition process factors on the composition, microstructure and electrochemical properties of the materials were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), cyclic voltammetry (CV), AC impedance spectroscopy (EIS) and constant current charge-discharge measurements. The cyclic stability and specific capacity of Sn-Cu alloy negative electrode materials can be improved by adding different kinds of amino acid surfactants in the process of DC electrodeposition, in which aminoacetic acid is used as additive, and the electrodeposition time is 4 minutes and the current density is 5 Ma 路cm-2. The specific discharge capacity of the alloy electrode 0.1C is 678.8 mAh 路g-1C, the discharge capacity of 0.5C is 485.2mAh 路g-1.The capacity retention rate of the alloy electrode is 81.4 after 50 cycles. The conditions for the preparation of Sn-Cu alloy anode materials by pulse electrodeposition are as follows: pulse frequency 10 Hz, current density 20 Ma 路cm -2, duty cycle 20, pulse time 5 min. The specific discharge capacity of the alloy electrode 0.1 C is 821.8mAh 路g-1C, the discharge specific capacity is 494.5mAh 路g-1C after 50 cycles, the capacity retention rate is 66.0.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM912

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