本发明公开了一种硅碳负极材料的制备方法，通过引入生物质碳前驱体制备的多孔骨架来构造硅碳负极材料的类核壳结构。首先将纳米硅超声分散在水中形成悬浊液，然后将生物质碳前驱体破碎得到的粉末加入到悬浊液中超声，随后经真空抽滤，烘干，粉碎获得干燥的粉末，将粉末置于惰性气氛保护的高温炉中于650~1200℃下煅烧20~90min，获得碳包覆的纳米硅。采用本发明所制备的硅碳材料作为锂离子电池负极，首圈库伦效率在88%以上，并且第二圈时仍保持有约2200 mAh g‑1的充放电容量，相较于纯纳米硅在倍率及循环性能方面有明显的性能提升。
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[ DB ] CONNECT:[ UseTime:0.001297s ] mysql:host=pc-m5epcw1px949b110u.rwlb.rds.aliyuncs.com;port=3306;dbname=yousedb;charset=utf8
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[ SQL ] SELECT * FROM `tb_para` WHERE `id` = 1 LIMIT 1 [ RunTime:0.001323s ]
[ SQL ] SHOW COLUMNS FROM `tb_tech` [ RunTime:0.001165s ]
[ SQL ] UPDATE `tb_tech` SET `hit`=`hit`+1 WHERE `id` = 602103 [ RunTime:0.001258s ]
[ SQL ] SELECT * FROM `tb_tech` WHERE `id` = 602103 LIMIT 1 [ RunTime:0.001113s ]
[ SQL ] SHOW COLUMNS FROM `tb_admin` [ RunTime:0.001137s ]
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[ SQL ] SHOW COLUMNS FROM `tb_category` [ RunTime:0.001222s ]
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[ SQL ] SELECT * FROM `tb_anchor` ORDER BY `id` ASC [ RunTime:0.002904s ]
[ SQL ] SELECT `id`,`title` FROM `tb_tech` WHERE `id` > 602103 AND `check_status` = 1 AND `category_id` = 141 ORDER BY `submit_date` ASC LIMIT 1 [ RunTime:0.002858s ]
[ SQL ] SELECT `id`,`title` FROM `tb_tech` WHERE `id` < 602103 AND `check_status` = 1 AND `category_id` = 141 ORDER BY `submit_date` DESC LIMIT 1 [ RunTime:0.152207s ]
[ SQL ] SHOW COLUMNS FROM `tb_mcc` [ RunTime:0.001234s ]
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[ SQL ] SHOW COLUMNS FROM `tb_industry_report` [ RunTime:0.001039s ]
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