Lithium-rich　layered　oxides　(LLOs)　are　one　of　the　attractive　cathodes　for　high-energy　lithium-ion　batteries　(LIBs).　However,　their　rate　performance　and　cycling　stability,　especially　at　high　temperatures,　are　still　limited　for　practical　applications.　Herein,　combining　surface　modification　with　a　spinel　structure　and　oxygen　vacancy　and　introduction　an　electronic　conductor　of　multidimensional　carbon,　the　electrochemical　performance　of　LLOs　at　high　temperatures　has　been　significantly　improved.　At　an　operation　temperature　of　55　degrees　C,　the　modified　LLOs　can　deliver　a　high　rate　capacity　of　223.3　mAh　g(-1)　at　5C　and　a　capacity　retention　of　78.5%　at　1C　after　100　cycles.　An　investigation　into　the　pristine　and　modified　LLOs　using　high-temperature　in　situ　electrochemical　X-ray　diffraction　has　revealed　that　the　latter　has　better　structural　stability　during　the　electrochemical　cycling　process　and　exhibits　a　smaller　cell　volume　variation　of　1.99%　compared　to　3.47%　of　the　former.　This　work　can　provide　an　effective　way　to　solve　the　poor　cycle　stability　and　rate　capability　of　LLOs　and　also　introduce　the　high-temperature　in　situ　electrochemical　X-ray　diffraction　technique　for　structure　evolution　investigations　of　other　battery　systems.