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鈦摻雜對鈷酸鋰正較材料性能的影響

來(lái)源: 2010/1/29 10:09:00

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<p class="MsoNormal" style="margin: 15.6pt 0cm; line-height: 150%; text-align: center; mso-para-margin-top: 1.0gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: 1.0gd; mso-para-margin-left: 0cm;" align="center"><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 16pt; line-height: 150%; font-family: 楷體_GB2312; mso-bidi-font-family: Arial;">鈦摻雜對鈷酸鋰正較材料性能的影響</span></strong><strong style="mso-bidi-font-weight: normal;"><span style="font-size: 16pt; line-height: 150%; font-family: 楷體_GB2312; mso-hansi-font-family: Arial; mso-bidi-font-family: Arial;" lang="EN-US"></span></strong></p> <p class="MsoNormal" style="margin: 15.6pt 0cm; line-height: 150%; mso-para-margin-top: 1.0gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: 1.0gd; mso-para-margin-left: 0cm;"><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US"><br /><span style="font-size: small;">LiCoO<sub>2</sub> </span></span><span style="font-size: small;"><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">是商品化鋰離子電池較早使用的正較材料,因其具有易于合成,電壓平臺高,比能量適中,循環(huán)性能好等優(yōu)點(diǎn),仍為鋰離子電池的主流正較材料。但由于其結構固有的特點(diǎn),</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO2</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">在生產(chǎn)加工過(guò)程中,很容易被氧化,從而使其容量急速衰退,存在過(guò)充安全隱患。在</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO2</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">正較材料中慘雜納米二氧化鈦(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">VK-TA18</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">),可以有效的阻止</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO2</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">的氧化,從而提高其容量及循環(huán)穩定性</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">,</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">特別是循環(huán)時(shí)放電電壓平臺的穩定性,可有效提高電池在多次充放電過(guò)程中的電化學(xué)穩定性和熱穩定性,電池在使用過(guò)程中更穩定、更耐用。</span></span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US"><br /><br /></span><span style="font-size: small;"><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">1</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;"> </span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">在</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO2 </span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">表面摻雜電化學(xué)性能相對穩定的納米二氧化鈦(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">VK-TA18</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)后,降低了</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO<sub>2</sub></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">表面氧的活性,減少了其與電解液的接觸面積,舒緩了</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO<sub>2</sub></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">中</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">Co</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">在電解液中的溶解,避免電池容量的衰退,增加鋰電池的穩定性;</span></span><span style="font-size: small;"><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US"> <br /></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">2</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)在鈷酸鋰表面,適量的納米二氧化鈦(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">VK-TA18</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)可以疏松狀存在,降低了粒子間應力及循環(huán)過(guò)程中所造成的結構和體積的微小應變,增加電池的穩定性。</span></span><span style="font-size: small;"><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US"> <br /></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">3</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)納米二氧化鈦(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">VK-TA18</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)摻雜降低了</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO<sub>2</sub></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">在充放電過(guò)程中的較化,使材料具有更高的放電電壓及更平穩的放電效果。</span></span><span style="font-size: small;"><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US"> <br /></span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">4</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)納米二氧化鈦(</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">VK-TA18</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">)摻雜到鈷酸鋰中,可以有效舒緩</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;" lang="EN-US">LiCoO2</span><span style="line-height: 150%; font-family: 宋體; mso-ascii-font-family: Arial; mso-hansi-font-family: "Times New Roman"; mso-bidi-font-size: 10.5pt; mso-bidi-font-family: Arial;">在充放電循環(huán)過(guò)程中的電化學(xué)阻抗的增加,有利于降低電池的容量衰減,提高高溫循環(huán)性能,提高電池的電化學(xué)性能。</span><span style="line-height: 150%; font-family: Arial; mso-bidi-font-size: 10.5pt;"> <span lang="EN-US"></span></span></span></p> <p class="MsoNormal" style="margin: 15.6pt 0cm; line-height: 150%; mso-para-margin-top: 1.0gd; mso-para-margin-right: 0cm; mso-para-margin-bottom: 1.0gd; mso-para-margin-left: 0cm;"><span style="line-height: 150%; font-family: Arial; 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